Maxim MAX9777 User's Manual
Contents
1. REGISTER ADDRESS 0000 0010 NAME VALUE DESCRIPTION RESET Reset dev RESET Reset dev RESET 5 Reset devi RESET ED Reset dev RESET Reset dev RESET gt Reset devi X 0 Normal operation 0 HD i 1 Shutdown Default state Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Table 5 MAX9777 Control Register Format BIT NAME VALUE DESCRIPTION 7 X Don t Care X Don t Care X Don t Care Speaker mode selected SPKR HP Headphone mode selected Gain setting A selected GAINA B Gain setting B selected Automatic headphone detection enabled Automatic headphone detection disabled HPS ignored 0 Input 1 selected IN1 IN2 1 Input 2 selected X Don t Care Default Table 6 MAX9777 Status Register Format Nu Read Data Format In read mode R W 1 the MAX9777 writes the con tents of the selected register to the bus The direction of the data flow reverses following the address acknowl edge by the MAX9777 The master device reads the contents of all registers including the read only status register Table 6 shows the status register format Interrupt Output INT The MAX9777 includes an interrupt output INT that can indicate to a master device that an event has occurred INT is triggered when the state of HPS changes During normal operation INT idles high2. THD N 196 THD N 196 amp p a 2 a 10 u 2 E 3 o 1 1 05 0 0 0 40 15 10 35 60 85 40 15 10 35 60 85 40 15 1 AMBIENT TEMPERATURE AMBIENT TEMPERATURE AMBIENT OUTPUT POWER vs LOAD RESISTANCE POWER DISSIPATION vs OUTPUT POWER SPEAKER MODE SPEAKER MODE 5 e 18 8 E 14 4 E EN 12 3 9 10 amp z R 08 5 a 0 6 04 1 02 0 0 1 1 00 1k Ok Ok 0 05 10 15 20 25 LOAD RESISTANCE Q OUTPUT POWER W 6 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Typical Operating Characteristics continued PVpp 5V GND PGND OV VSHDN 5V CBiAS 1uF TA 25 C unless otherwise noted POWER SUPPLY REJECTION RATIO CROSSTALK vs FREQUENCY vs FREQUENCY SPEAKER MODE SPEAKER MODE TE 200mVp p E E 8 2 z 3 10 100 1 10k 00k 10 00 1 10k 00k FREQUENCY Hz FREQUENCY Hz ENTERING SHUTDOWN SPEAKER MODE EXITING SHUTDOWN SPEAKER MODE MAX9777 78 toc20 MAX9777 78 toc21 SHDN 2V div OUT AND OUT OUT AND OUT 1V div 1V div OUT OUT_ 200mV div OUT OUT 500mV div 400ms div 100ms div TOTAL HARMONIC DISTORTION P
3. 5V CBiAS 1pF TA 25 C unless otherwise noted POWER DISSIPATION vs OUTPUT POWER POWER DISSIPATION vs OUTPUT POWER POWER SUPPLY REJECTION RATIO HEADPHONE MODE HEADPHONE MODE vs FREQUENCY HEADPHONE MODE 12 70 3 2 3 LE 200mVp E E 60 E E me En 2 3 t 5 z 8 E z 40 8 6 ce 2 E 30 5 E 5 2 10 0 0 50 100 150 200 0 20 40 60 80 100 10 00 1 10k 100k OUTPUT POWER mW OUTPUT POWER mW FREQUENCY Hz CROSSTALK vs FREQUENCY HEADPHONE MODE EXITING SHUTDOWN HEADPHONE MODE MAX9777 78 toc37 8 i 8 SHON 2V div a B a z B e OUT 5 1V div HP JACK 200mV div 10 00 1 10k 100k 100ms div i RL 160 REQUENCY Hz INPUT AC COUPLED TO GND SUPPLY CURRENT vs SUPPLY VOLTAGE ENTERING SHUTDOWN HEADPHONE MODE SPEAKER MODE MAX9777 78 toc38 25 8 MAGN on Ta 85 C E SHDN 20 z 2V div Z 15 ec ec OUT 1V div g 10 a 5 HP JACK 100mV div 100ms div 4 50 4 75 5 00 5 25 5 50 SUPPLY VOLTAGE V 9 8126XVW Z2Z26XVM Stereo 3W Audio Power Amplifiers with Headphone Drive and Input M
4. BIAS Capacitor BIAS is the output of the internally generated 2 5VDC bias voltage The BIAS bypass capacitor CBlAS improves PSRR and THD N by reducing power supply and other noise sources at the common mode bias node and also generates the clickless popless start up shutdown DC bias waveforms for the speaker ampli fiers Bypass BIAS with 1uF capacitor to GND Supply Bypassing Proper power supply bypassing ensures low noise low distortion performance Place a 0 1uF ceramic capacitor from Vpp to GND Add additional bulk capacitance as required by the application typically 100pF Bypass PVpp with a 100uF capacitor to GND Locate bypass capacitors as close to the device as possible Gain Select The MAX9777 MAX9778 feature multiple gain settings on each channel making available different gain and feed back configurations The gain setting resistor RF is con nected between the amplifier output OUT_ and the gain set point GAIN An internal multiplexer switches between the different feedback resistors depending on the status of the gain control input The stereo MAX9777 MAX9778 feature two gain options per chan nel See Tables 1a and 1b for the gain setting options Bass Boost Circuit Headphones typically have a poor low frequency response due to speaker and enclosure size limitations A bass boost circuit compensates the poor low frequen response Figure 10 At low frequencies the capaci tor is an open cir
5. Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Package Information The package drawing s in this data sheet may not reflect the most current specifications For the latest package outline information go to www maxim ic com packages QFN THIN EPS MARKING DETAIL A BOTTOM VIEW SEATING PLANE DALLAS AVLAXL VI PACKAGE OUTLINE 16 20 28 32 40L THIN QFN 5x5x0 8mm VAL MAAK Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Package Information continued The package drawing s in this data sheet may not reflect the most current specifications For the latest package outline information go to www maxim ic com packages COMMON DIMENSIONS EXPOSED PAD VARIATIONS PKG CODES WW Lo oo2 oos o o o2 o fo 05 s o o 05 5 0 05 EM 0 20 JEpec whs _ wHHb3 NOTES 1 DIMENSIONING amp TOLERANCING CONFORM TO ASME 14 5 1994 2 ALL DIMENSIONS ARE IN MILLIMETERS ANGLES ARE IN DEGREES 3 NIS THE TOTAL NUMBER OF TERMINALS A THE TERMINAL 1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM TO JESD 95 1 SPP 012 DETAILS OF TERMINAL 1 IDENTIFIER ARE OPTIONAL BUT MUST BE LOCATED WITHIN THE ZONE INDICATED THE TERMINAL 1 IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE A DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0 25 mm AND 0 30 mm FROM TERMINAL TIP A ND AND NE REFER TO
6. THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY 7 DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION A COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS 9 DRAWING CONFORMS M0220 EXCEPT EXPOSED PAD DIMENSION FOR T2855 3 AND T2855 6 L WARPAGE SHALL NOT EXCEED 0 10 mm DALLAS 11 MARKING IS FOR PACKAGE ORIENTATION REFERENCE ONLY PALLAS MAAXALAVI 12 NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY AX LEAD CENTERLINES TO BE AT TRUE POSITION AS DEFINED BY BASIC DIMENSION 0 05 mms PACKAGE OUTLINE 16 20 28 32 40L THIN QFN 5x5x0 8mm APPROVAL DOCUMENT CONTROL NG REV DRAWING NOT TO SCALE 21 0140 SEE COMMON DIMENSIONS TABLE Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product No circuit patent licenses are implied Maxim reserves the right to change the circuitry and specifications without notice at any time Maxim Integrated Products 120 San Gabriel Drive Sunnyvale CA 94086 408 737 7600 27 2006 Maxim Integrated Products Printed USA MAXIM is a registered trademark of Maxim Integrated Products Inc 8126XVW Z2Z26XVM
7. input multiplexer a logic high selects input 1 a logic low selects input 2 Bit 2 HPS D controls the headphone sensing A logic low configures the device in automatic headphone detection mode A logic high dis ables the HPS input Bit 3 GAINA B controls the gain select multiplexer A logic low selects GAINA A logic high selects GAINB GAINA B is ignored when HPS D 0 Bit 4 SPKR HP selects the amplifier operating mode when HPS D 1 A logic high selects speaker mode and a logic low selects headphone mode ADDRESS WR COMMAND ACK DATA ACK 7 BITS 8 BITS 8BITS 12C SLAVE ADDRESS SELECTS DEVICE WRITTEN TO REGISTER ADDRESS SELECTS REGISTER TO BE REGISTER DATA ADDRESS WR COMMAND ACK ADDRESS WR DATA 7 BITS 8 BITS 7 BITS 8 BITS 2 SLAVE ADDRESS SELECTS DEVICE TO BE READ REGISTER ADDRESS SELECTS REGISTER 12C SLAVE ADDRESS SELECTS DEVICE DATA FROM SELECTED REGISTER Figure 7 Write Read Data Format Example Table 3 MAX9777 MUTE Register Format REGISTER ADDRESS 0000 0001 Table 4 MAX9777 SHDN Register Format NAME VALUE DESCRIPTION X Don t Care X Don t Care X Don t Care 0 Unmute right channel ER 7 1 Mute right channel 0 Unmute left channel 1 Mute left channel Don t Care Don t Care Don t Care Default state 16
8. while SCL is high Figure 4 A START condition from the master signals the beginning of a transmission to the MAX9777 The master terminates transmission by issuing the STOP condition this frees the bus If a REPEATED START condition is generated instead of a STOP condition the bus remains active lt typ STA SP I ET l SCL i 1 raton gt o IHD STA a MEE START CONDITION E eere dod 4 4 REPEATED STOP START START CONDITION CONDITION CONDITION Figure 4 START STOP Conditions 14 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Early STOP Conditions The MAX9777 recognizes a STOP condition at any point during the transmission except if a STOP condi tion occurs in the same high pulse as a START condi tion Figure 5 This condition is not a legal 12C format at least one clock pulse must separate any START and STOP condition REPEATED START Conditions A REPEATED START Sr condition may indicate a change of data direction on the bus Such a change occurs when a command word is required to initiate a read operation Sr may also be used when the bus master is writing to several 12C devices and does not want to relinquish control of the bus The MAX9777 ser ial interface supports continuous write operations with or without an Sr condition separating them Continuous read operations require Sr conditions because of the chan
9. 19 0509 Rev 0 4 06 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux General Description The MAX9777 MAX9778 combine a stereo 3W bridge tied load BTL audio power amplifier stereo single ended SE headphone amplifier headphone sensing and a 2 1 input multiplexer all in a tiny 28 pin thin QFN package These devices operate from a single 4 5V to 5 5V supply and feature an industry leading 100dB PSRR allowing these devices to operate from noisy supplies without the addition of a linear regulator An ultra low 0 002 THD N ensures clean low distortion amplification of the audio signal Click and pop sup pression minimizes audible transients on power and shutdown cycles Power saving features include low 4mV Vos minimizes DC current drain through the speakers low 13mA supply current and a 10 shut down mode A MUTE function allows the outputs to be quickly enabled or disabled A headphone sense input detects the presence of a headphone jack and automatically configures the amplifiers for either speaker or headphone mode In speaker mode the amplifiers can deliver up to 3W of continuous average power into load In head phone mode the amplifier can deliver up to 200mW of continuous average power into a 16Q load The gain of the amplifiers is externally set allowing maximum flexi bility in optimizing output levels for a given load The amplifiers also feature a 2 1 input multiplexer allowing mul
10. 200mW headphone amplifiers input multi plexers headphone sensing and comprehensive click and pop suppression The MAX9777 MAX9778 are stereo BTL headphone amplifiers The MAX9777 is controlled through an I2C compatible 2 wire serial interface The MAX9778 is controlled through five logic inputs MUTE SHDN HPS EN GAINA B IN1 2 see the Selector Guide The MAX9777 MAX97778 fea ture exceptional PSRR 100dB at 1kHz allowing these devices to operate from noisy digital supplies without the need for a linear regulator The speaker amplifiers use a BTL configuration The signal path is composed of an input amplifier and an output amplifier Resistor Rin sets the input amplifier s gain and resistor Rr sets the output amplifier s gain The output of these two amplifiers serves as the input to a slave amplifier configured as an inverting unity gain follower This results in two outputs identical in magni tude but 180 out of phase The overall gain of the speaker amplifiers is twice the product of the two amplifier gains see the Gain Setting Resistors section A feature of this architecture is that there is no phase inversion from input to output When configured as a headphone single ended ampli fier the slave amplifier is disabled muting the speaker and the main amplifier drives the headphone The MAX9777 MAX9778 can deliver 3W of continuous power into a 3Q load with less than 1 THD N in speaker mode and 200mW of cont
11. 45V TO 5 5V PVpp Vpp 0 68uF 15kQ AUDIO INPUT AUDIO INPUT 0 68uF Aupio 0687 INPUT 15KQ 15KQ 10ko gt AUDIO INPUT 0 68uF 15kQ 4 5V TO 5 5V 10kco gt 1kQ 1kQ SHDN SCL TO SDA uCONTROLLER ADD INT MAXIM MAX9777 GND 0 047uF GAINRB 22 GAIN SET MUX GAINRA 21 10ko 10ko HPS 23 8126XVW Z2Z26XVM MAX9777 MAX9778 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Functional Diagrams continued 4 5V TO 5 5V 100uF VW 11 25 0 047 uF 0 68uF 15 AUDIO INPUT 6 AUDIO ANN 0 68uF 15kQ 0 047 uF LM M MES INPUT 11 WV AUDIO INPUT 0 68uF 15 4 5V TO 5 5V wag 1kQ TO uCONTROLLER i HPS EN AVILAXIZVI MAX9778 2 MAAK TOP VIEW Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Pin Configurations TOP VIEW MAXIM 0 UL MAXIM 1 1 25 1 MAX9778 25 8126XVW Z2Z26XVM MAX9777 MAX9778
12. DE 100 Ay 1VN 320 10 MAX9777 78 toc28 01 THD N 0 01 0 001 f 1kHz 0 0001 0 25 50 15 100 125 OUTPUT POWER mW OUTPUT POWER vs AMBIENT TEMPERATURE HEADPHONE MODE 150 125 f THD N 10 MAX9777 78 toc331 e e OUTPUT POWER mW a en e Vpp PVpp 5V GND PGND OV VSHDN 5V CBiAS 1pF TA 25 C unless otherwise noted TOTAL HARMONIC DISTORTION PLUS NOISE vs OUTPUT POWER HEADPHONE MODE 100 Ay 1VN RL 160 10 9777 78 toc26 40 15 10 35 60 85 AMBIENT TEMPERATURE a 0 40 15 10 35 60 85 AMBIENT TEMPERATURE C 01 0 01 0 001 f 1kHz 0 0001 0 50 100 150 200 250 300 OUTPUT POWER mW TOTAL HARMONIC DISTORTION PLUS NOISE vs OUTPUT POWER HEADPHONE MODE 100 g Ay 2UN 3 320 E 10 3 0 2E 0 0 0 00 0 000 0 25 50 75 100 125 OUTPUT POWER mW OUTPUT POWER vs LOAD RESISTANCE HEADPHONE MODE 600 f 1kHz 2 500 E 400 HD N 10 E Lac amp 300 ES 2 Z 200 DH THD N 1 100 0 1 10 100 1k 10k LOAD RESISTANCE MAKI Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Typical Operating Characteristics continued PVpp 5V GND PGND OV VSHDN
13. HDN HPS EN GAINA B IN1 2 Input Voltage High 2 V Input Voltage Low VIL 0 8 V Input Leakage Current IN 1 pA HEADPHONE SENSE INPUT HPS 0 9 x Input Voltage High V V p ge nig IH VDD 0 7 x Input Voltage Low V V p g IL VDD Input Leakage Current Click Pop Level MAXI MI Peak voltage A weighted Into shutdown 32 samples per second Notes 2 4 Out of shutdown MAX9777 MAX9778 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux ELECTRICAL CHARACTERISTICS continued PVpp 5 0V GND PGND OV VSHDN 5V 1pF Rin 15kQ RL TA Tmi to Tmax unless otherwise noted Typical values are at Ta 25 C Note 1 PARAMETER SYMBOL CONDITIONS 2 WIRE SERIAL INTERFACE SCL SDA ADD INT MAX9777 Input Voltage High VIH Input Voltage Low VIL Input Hysteresis Input High Leakage Current Input Low Leakage Current lit Input Capacitance CIN Output Voltage Low VOL Output Current High IOH TIMING CHARACTERISTICS MAX9777 Serial Clock Frequency fscL Bus Free Time Between STOP and START Conditions ART Condition Hold Time tHD STA tBUF ART Condition Setup Time tSU STA ock Period Low tLOW ock Period High tHIGH Data Setup Time tSU DAT Data Hold Time tHD DAT Receive SCL SDA Rise Time tr Receive SCL SDA Fall Time Transmit SDA Fall Time Pulse Width of Supp
14. If a headphone is inserted removed from the jack and that action is detected by HPS INT pulls the line low INT remains low until a read data operation is executed PC Compatibility The MAX9777 is compatible with existing 12C systems SCL and SDA are high impedance inputs SDA has an open drain that pulls the data line low during the ninth clock pulse The communication protocol supports the standard I C 8 bit communications The general call address is ignored The MAX9777 slave addresses are compatible with the 7 bit 12C addressing protocol only REGISTER ADDRESS 0000 0000 BIT NAME VALUE DESCRIPTION 0 7 THRM 0 6 AMPR Device temperature below thermal limit Device temperature exceeding thermal limit O UTR current below current limit OUTR current exceeding current limit 0 OUTR current below current limit AMPR Jem 1 OUTR current exceeding current limit 0 5 4 AMPL UTL current below current limit O OUTL current exceeding current limit O 0 UTL current below current limit 3 2m 1 OUTL current exceeding current limit 0 Device in speaker mode 2 HPSTS EET 1 Device in headphone mode X Don t Care 0 X Don t Care 17 8126XVW Z2Z26XVM MAX9777 MAX9778 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Applications Information BTL Speaker Amplifiers The MAX9777 MAX9778 feature speaker amplif
15. LUS NOISE TOTAL HARMONIC DISTORTION PLUS NOISE vs FREQUENCY HEADPHONE MODE vs FREQUENCY HEADPHONE MODE 1 g E RL 162 42 R 162 H Ay TUN HE Ay 2NN E E 0 1 0 Pout 25mW Pour 50mW on Pour 50mW 00 0 001 0001 Pour 100mW Pout 150mW Pour 100mW Pout 150mW 0 0001 0 000 10 100 1k 10k 100k 10 100 1k 10k 100k FREQUENCY Hz FREQUENCY Hz MAXIA 7 8126XVW Z2Z26XVM MAX9777 MAX9778 TOTAL HARMONIC DISTORTION PLUS NOISE vs FREQUENCY HEADPHONE MODE 1 R 20 HE Ay 1VN ME El 04 gt 79 Pout 25mW Pour 50mW 5 0 0 001 Four 100mW EER 150mW 0 0001 10 100 1k 10k 100k FREQUENCY Hz TOTAL HARMONIC DISTORTION PLUS NOISE vs OUTPUT POWER HEADPHONE MODE 100 5 Ay 2V V E 160 E 10 P 1 01 0 01 0 001 0 0001 0 50 100 150 20 250 300 OUTPUT POWER mW OUTPUT POWER vs AMBIENT TEMPERATURE HEADPHONE MODE 30 THD N 10 9777 78 10030 25 THD N 196 OUTPUT POWER mW Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Typical Operating Characteristics continued TOTAL HARMONIC DISTORTION PLUS NOISE vs FREQUENCY HEADPHONE MODE 1 2320 Ay 2VN MAX9777 78 toc25 0 1 Pout 25mW Pour 50mW THD N 96 0 001 Pour 150 z out 100mW 0 0001 10 100 1k 10k 100k FREQUENCY Hz TOTAL HARMONIC DISTORTION PLUS NOISE vs OUTPUT POWER HEADPHONE MO
16. UT POWER SPEAKER MODE 100 Ay 2VN E 4Q E 10 E a Fo f 10kH2 f 1kHz 0 0 f 20Hz 0 00 0 05 10 15 20 25 30 35 OUTPUT POWER W 8126XVW Z2Z26XVM MAX9777 MAX9778 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux TOTAL HARMONIC DISTORTION PLUS NOISE vs OUTPUT POWER SPEAKER MODE Typical Operating Characteristics continued TOTAL HARMONIC DISTORTION PLUS NOISE vs OUTPUT POWER SPEAKER MODE PVpp 5V GND PGND OV VSHDN 5V 1pF TA 25 C unless otherwise noted TOTAL HARMONIC DISTORTION PLUS NOISE vs OUTPUT POWER SPEAKER MODE MAX9777 78 toc12 1 0 1 5 2 0 MAX9777 78 toc15 35 60 85 EMPERATURE C MAX9777 78 toc17 100 100 100 410 E Ay NN E Ay ANN RL 4Q E 8Q E 8Q 10 5 10 2 10 E d i cd i az 01 01 01 0 01 0 01 0 01 1 20Hz 1 208 f 20Hz 0 001 0 001 0 001 0 05 10 15 20 25 30 35 0 05 10 15 2 0 0 05 OUTPUT POWER W OUTPUT POWER W OUTPUT POWER W OUTPUT POWER vs AMBIENT TEMPERATURE OUTPUT POWER vs AMBIENT TEMPERATURE OUTPUT POWER vs AMBIENT TEMPERATURE SPEAKER MODE SPEAKER MODE SPEAKER MODE 4 z 4 2 0 E THD N 10 d THD N 1096
17. a head phone plug is inserted into the jack the control pin is dis connected from the tip contact and HPS is pulled to VDD through R1 setting the device into headphone mode and the gain setting defaults to GAINB MAX9777 see the Gain Select section Place a resistor in series with the control pin and HPS R3 to prevent any audio signal from coupling into HPS when the device is in speaker mode Shutdown The MAX9777 MAX9778 feature 10pA low power shutdown mode that reduces quiescent current con sumption and extends battery life The drive amplifiers and bias circuitry are disabled the amplifier outputs OUT go high impedance and BIAS is driven to GND Driving SHDN low places the devices into shut down mode disables the interface and resets the 12C registers to a default state A logic high on SHDN enables the devices MAX9777 Software Shutdown A logic high on bit O of the SHDN register places the MAX9777 in shutdown mode A logic low enables the MAXUM MAXIM MAX9777 MAX9778 Figure 2 HPS Configuration Circuit device The digital section of the MAX9777 remains active when the device is shut down through the inter face All devices feature a logic low on the SHDN input MUTE The MAX9777 MAX9778 feature a mute mode When the device is muted the input is disconnected from the amplifiers MUTE does not shut down the device MAX9777 MUTE The MAX9777 MUTE mode is selected by writing to the MUTE re
18. a transfer on the bus and generates SCL to permit that transfer A master device communicates to the MAX9777 by transmitting the proper address followed by a com mand and or data words Each transmit sequence is framed by a START S or REPEATED START Sr con dition and a STOP P condition Each word transmitted over the bus is 8 bits long and is always followed by an acknowledge clock pulse SDA and SCL are open drain outputs requiring a pullup resistor 5000 or greater to generate a logic high volt age Series resistors in line with SDA and SCL are option al These series resistors protect the input stages of the SMBus is a trademark of Intel Corp Pe vt tsu 1 Low gt L amp D DAT l l 1 HD STA lt gt devices from high voltage spikes on the bus lines and minimize crosstalk and undershoot of the bus signals Bit Transfer One data bit is transferred during each SCL clock cycle The data on SDA must remain stable during the high period of the SCL clock pulse Changes in SDA while SCL is high are control signals see the START and STOP Conditions section SDA and SCL idle high when the I C bus is not busy START and STOP Conditions When the serial interface is inactive SDA and SCL idle high A master device initiates communication by issu ing a START condition A START condition is a high to low transition on SDA with SCL high A STOP condition is a low to high transition on SDA
19. ackage Thermal overload protection limits total power dissipa tion in these devices When the junction temperature exceeds 160 C the thermal protection circuitry dis ables the amplifier output stage The amplifiers are enabled once the junction temperature cools by 15 C This results in a pulsing output under continuous ther mal overload conditions as the device heats and cools Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Component Selection Gain Setting Resistors External feedback components set the gain of the MAX9777 MAX9778 Resistor Rin sets the gain of the input amplifier and resistor RF sets the gain of the second stage amplifier AyourT 10kQ Re Avin A 0 VIN Rin VOUT Combining Av N and RIN and set the single ended gain of the device as follows 10kQ R R Av 7 Avin xAvour NW 50 s As shown the two stage amplifier architecture results in a noninverting gain configuration preserving absolute phase through the MAX9777 MAX9778 The gain of the device in BTL mode is twice that of the sin gle ended mode Choose Rijn between 10kQ and 15kQ and Rr between 15kQ and 100kQ Input Filter The input capacitor CiN in conjunction with RIN forms a highpass filter that removes the DC bias from an incoming signal The AC coupling capacitor allows the amplifier to bias the signal to an optimum DC level Assuming zero source
20. atio SNR RL 80 Pour 1W BW 22Hz to 22kHz Slew Rate SR Maximum Capacitive Load Drive CL No sustained oscillations Crosstalk fin 10kHz Peak voltage A weighted Into shutdown Click Pop Level 32 samples per second Notes 2 6 Out of shutdown 2 MAXIM Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux ELECTRICAL CHARACTERISTICS continued PVpp 5 0V GND PGND OV VSHDN 5V 1pF Rin 15kQ RL TA to Tmax unless otherwise noted Typical values are at Ta 25 C Note 1 m PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS gt lt OUTPUT AMPLIFIERS HEADPHONE MODE HPS Vpp VDD 4 5V to 5 5V 75 106 m oe Hele cuore PSRR f 1kHz VRIPPLE 200mVp p 88 dB f 20kHz VRIPPLE 200mVp p 76 m fin 1kHz THD N lt RL 320 88 Output Power PoUT S mW 1 TA 2 25 C RL 160 200 D Pour 60mW 0 002 gt lt Total Harmonic Distortion Plus fin 1kHz RL 320 THD N Noise BW 22Hz to 22kHz Pour 125mW 0 002 RL 160 i f RL 320 BW 22Hz to 22kHz N Signal to Noise Ratio SNR 92 dB 9 Vout 1VRMS Slew Rate SR 1 8 V us Maximum Capacitive Load Drive CL No sustained oscillations 2 nF Crosstalk fin 10kHz 78 dB BIAS VOLTAGE BIAS BIAS Voltage VBIAS 2 35 2 5 2 65 V Output Resistance RBIAS 50 kQ DIGITAL INPUTS MUTE S
21. ch that the worst case load CouT com bination yields an adequate response Select capaci tors with low ESR to minimize resistive losses and optimize power transfer to the load If layout constraints require a physically smaller output coupling capacitor decrease the value of Cour and add series resistance to the output of the MAX9777 MAX9778 see Figure 9 With the added series resistance at the output the cutoff frequency of the highpass filter is 1 f agp 2 8 Rsenies Cour Since the cutoff frequency of the output highpass filter is inversely proportional to the product of the total load resistance seen by the outputs RL RSERIES and increase the total resistance seen by the MAX9777 MAX9778 outputs by the same amount COUT is decreased to maintain low frequency performance Since the added series resistance forms a voltage divider with the headphone speaker resistance for fre quencies within the passband of the highpass filter there is a loss in voltage gain To compensate for this loss increase the voltage gain setting by an amount equal to the attenuation due to the added series resis tance Use the following equation to approximate the required voltage gain compensation RL RSERIES R Ay COMP 2olod Cour RSERIES OUT 6 ANN Figure 9 Reducing Cour by Adding RSERIES 19 8126XVW Z2Z26XVM MAX9777 MAX9778 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux
22. cuit and the effective impedance in the feedback loop RF EFF is RF EFF RF1 At the frequency 4 2nRroCrE Figure 10 Bass Boost Circuit 20 where the impedance Cr begins to decrease and at high frequencies the Cr is a short circuit Here the impedance of the feedback loop is Hr x Reo DREFF Peo Assuming RF1 RF2 then RF EFF at low frequencies is twice that of RF EFF at high frequencies Figure 11 Thus the amplifier has more gain at lower frequencies boosting the system s bass response Set the gain rol off frequency based upon the response of the speaker and enclosure To minimize distortion at low frequencies use capaci tors with low voltage coefficient dielectrics when select ing Cr Film or COG dielectric capacitors are good choices for Cr Capacitors with high voltage coeffi cients such as ceramics non COG dielectrics can result in increased distortion at low frequencies Layout and Grounding Good PC board layout is essential for optimizing perfor mance Use large traces for the power supply inputs and amplifier outputs to minimize losses due to para sitic trace resistance as well as route heat away from the device Good grounding improves audio perfor mance minimizes crosstalk between channels and prevents any digital switching noise from coupling into the audio signal If digital signal lines must cross over or under audio signal lines ensure that they cross per pendi
23. cular to each other The MAX9777 MAX9778 TQFN package features an exposed thermal pad This pad lowers the package s thermal resistance by providing a direct heat conduc tion path from the die to the PC board Connect the pad to signal ground OV by using a large pad or multiple vias to the ground plane Rei Rr Rin FREQUENCY 2 Ro Cr Figure 11 Bass Boost Hesponse Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Typical Application Circuits 4 5V TO 5 5V 100uF Voo PVpp v BIAS 0 047uF 274kQ 332kQ GAINLB 15kQ GAINLA OUTL OUTL L2 MAXIM MAX9777 R1 4 5V TO 5 5V 220uF T 45V TO 5 5V 1kQ mat i 21 4kQ Q 680kQ 0 047uF MICROCONTROLLER AAA MAXIM et 8ZZ6XVIN ZZZ6EXVIN MAX9777 MAX9778 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux MICROCONTROLLER 22 Typical Application Circuits continued 4 5V TO 5 5V Voo PVpp BIAS 0 047uF 957 4ko 100uF 332kQ 15kQ OUTL L2 MAXIM MAX9778 R1 45V TO 5 5V gt 680kQ INT 2 MUTE GAINA B HPS_EN SHDN GND PGND Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Functional Diagrams
24. er is disabled muting the speaker The gain is 1 2 that of the device in speaker mode and the output power is reduced by a factor of 4 In headphone mode the load must be capacitively coupled to the device blocking the DC bias voltage from the load see the Typical Application Circuits Power Dissipation and Heat Sinking Under normal operating conditions the MAX9777 MAX9778 can dissipate a significant amount of power The maximum power dissipation for each package is given in the Absolute Maximum Ratings section under Continuous Power Dissipation or can be calculated by the following equation TXMAX PDISSPKG MAX 8 JA where TJ MAX is 150 C TA is the ambient tempera ture and Oya is the reciprocal of the derating factor in C W as specified in the Absolute Maximum Ratings section For example 0JA of the TQFN package is 29 C W The increase in power delivered by the BTL configura tion directly results in an increase in internal power dis sipation over the single ended configuration The maximum power dissipation for a given Vpp and load is given by the following equation 2Vpp mR PDISS MAX If the power dissipation for a given application exceeds the maximum allowed for a given package either reduce VDD increase load impedance decrease the ambient temperature or add heatsinking to the device Large output supply and ground PC board traces improve the maximum power dissipation in the p
25. ge in direction of data flow a MA STOP START LEGAL STOP CONDITION SCL N START ILLEGAL STOP ILLEGAL EARLY STOP CONDITION Figure 5 Early STOP Condition Acknowledge Bit The acknowledge bit ACK is the ninth bit attached to any 8 bit data word The receiving device always gen erates ACK The MAX9777 generates an ACK when receiving an address or data by pulling SDA low during the night clock period When transmitting data the MAX9777 waits for the receiving device to generate an ACK Monitoring ACK allows for detection of unsuc cessful data transfers An unsuccessful data transfer occurs if a receiving device is busy or if a system fault has occurred In the event of an unsuccessful data transfer the bus master should reattempt communica tion at a later time Slave Address The bus master initiates communication with a slave device by issuing a START condition followed by a 7 bit slave address Figure 6 When idle the MAX9777 waits for a START condition followed by its slave address The LSB of the address word is the Read Write R W bit R W indicates whether the master is writing to or reading from the MAX9777 R W 0 selects the write condition RAW 1 selects the read condition After receiving the proper address the MAX9777 issues an ACK by pulling SDA low for one clock cycle The MAX9777 has a factory user programmed address Address bits A6 A2 are preset wh
26. gister see the Mute Register section The left and right channels can be independently muted MAX9778 MUTE The MAX9778 features an active high MUTE input that mutes all channels Click and Pop Suppression The MAX9777 MAX9778 feature Maxim s comprehen sive click and pop suppression When entering or exit ing shutdown the common mode bias voltage of the amplifiers is slowly ramped to and from the DC bias point using an S shaped waveform In headphone mode this waveform shapes the frequency spectrum minimizing the amount of audible components present at the headphone In speaker mode the BTL amplifiers start up in the same fashion as in headphone mode When entering shutdown both amplifier outputs ramp to GND quickly and simultaneously To maximize click and pop suppression drive SHDN to OV before power up or power down transitions 8ZZ6XVW ZZZ6XVIN MAX9777 MAX9778 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Digital Interface The MAX9777 features an I C SMBus compatible 2 wire serial interface consisting of a serial data line SDA and a serial clock line SCL SDA and SCL facili tate bidirectional communication between the MAX9777 and the master at clock rates up to 400kHz Figure 3 shows the 2 wire interface timing diagram The MAX9777 is a transmit receive slave only device rely ing upon a master to generate a clock signal The mas ter typically a microcontroller initiates dat
27. h This is typically useful in optimizing acoustic response from speakers with small physical dimensions Headphone Sense Enable The HPS input is enabled by HPS EN MAX9778 or the HPS D bit MAX9777 HPS D or HPS EN determines whether the device is in automatic detection mode or fixed mode operation see Tables 1a and 1b MAXIM MAX9777 MAX9778 Figure 1 Using the Input Multiplexer for Gain Setting Table 1a MAX9777 HPS Setting INPUTS SPKR HP A GAINA path selected B GAINB path selected A or B Gain path selected by GAINAB control bit in register 02h Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Table 1b MAX9778 HPS Setting INPUTS HPS EN GAIN PATH Note A or B Gain path selected by external GAINAB Headphone Sense Input HPS With headphone sense enabled a voltage on HPS less than 0 7 x Vpp sets the device to speaker mode A volt age greater than 0 9 x Vpp disables the inverting bridge amplifier OUT which mutes the speaker amplifier and sets the device into headphone mode For automatic headphone detection enable headphone sense and connect HPS to the control pin of a 3 wire headphone jack as shown in Figure 2 With no head phone present the resistive voltage divider created by R1 and R2 sets the voltage on HPS to be less than 0 7 x VDD setting the device to speaker mode and the gain setting defaults to GAINA MAX9777 When
28. iers designed to drive a load differentially a configuration referred to as bridge tied load BTL The BTL configu ration Figure 8 offers advantages over the single ended configuration where one side of the load is connected to ground Driving the load differentially doubles the output voltage compared to a single ended amplifier under similar conditions Thus the devices differential gain is twice the closed loop gain of the input amplifier The effective gain is given by Asst Rin Substituting 2 Vour P P for VoUT P P into the follow ing equations yields four times the output power due to doubling of the output voltage VoUT P P Vems Pour R L Since the differential outputs are biased at midsupply there is no net DC voltage across the load This elimi nates the need for DC blocking capacitors required for single ended amplifiers These capacitors can be large and expensive consume board space and degrade low frequency performance When the MAX9777 is configured to automatically detect the presence of a headphone jack the device defaults to gain setting A when the device is in speaker mode Figure 8 Bridge Tied Load Configuration 18 Single Ended Headphone Amplifier The MAX9777 MAX9778 can be configured as single ended headphone amplifiers through software or by sensing the presence of a headphone plug HPS In headphone mode the inverting output of the BTL amplifi
29. ile AO and A1 is set by ADD Connect ADD to either Vpp GND SCL or SDA to change the last 2 bits of the slave address Table 2 S A6 A5 M A3 A2 Al A0 Figure 6 Slave Adaress Byte Definition Table 2 MAX9777 12 Slave Addresses IC ADDRESS 100 1000 ADD CONNECTION GND VDD 100 1001 SDA 100 1010 SCL 100 1011 8126XVW Z2Z26XVM MAX9777 MAX9778 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Write Data Format There are three registers that configure the MAX9777 the MUTE register SHDN register and control register In write data mode R W the register address and data byte follow the device address Figure 7 MUTE Register The MUTE register O1hex is a read write register that sets the MUTE status of the device Bit 3 MUTEL of the MUTE register controls the left channel bit 4 MUTER controls the right channel A logic high mutes the respective channel a logic low brings the channel out of mute SHDN Register The SHDN register 02hex is a read write register that controls the power up state of the device A logic high in bit O of the SHDN register shuts down the device a logic low turns on the device A logic high is required in bits 2 to 7 to reset all registers to their default settings Control Register The control register O3hex is a read write register that determines the device configuration Bit 1 IN1 IN2 con trols the
30. impedance the 3dB point of the highpass filter is given by 1 x 2nRiNCIN Choose RIN according to the Gain Setting Resistors sec tion Choose the Cin such that f 3aB is well below the lowest frequency of interest Setting f 3qp too high affects the amplifier s low frequency response Use capacitors whose dielectrics have low voltage coefficients such as tantalum or aluminum electrolytic Capacitors with high voltage coefficients such as ceramics may result in an increased distortion at low frequencies Other considerations when designing the input filter include the constraints of the overall system the actual frequency band of interest and click and pop suppression Output Coupling Capacitor The MAX9777 MAX9778 require output coupling capacitors to operate in single ended headphone mode The output coupling capacitor blocks the DC component of the amplifier output preventing DC cur rent from flowing to the load The output capacitor and MAXI the load impedance form a highpass filter with a 3dB point determined by As with the input capacitor choose Cour such that is well below the lowest frequency of interest Setting f agg too high affects the amplifier s low fre quency response Load impedance is a concern when choosing COUT Load impedance can vary changing the point of the output filter A lower impedance increases the cor ner frequency degrading low frequency response Select Cour su
31. inuous average power into a 16Q load with less than 1 THD N in headphone mode These devices also feature thermal overload protection BIAS These devices operate from a single 5V supply and fea ture an internally generated power supply independent common mode bias voltage of 2 5V referenced to GND BIAS provides both click and pop suppression and sets the DC bias level for the audio outputs BIAS is internally connected to the noninverting input of each speaker amplifier see the Typical Application Circuits and Functional Diagrams Choose the value of the bypass capacitor as described in the BIAS Capacitor section No external load should be applied to BIAS Any load lowers the BIAS voltage affecting the overall perfor mance of the device 12 Input Multiplexer Each amplifier features a 2 1 input multiplexer allowing input selection between two stereo sources Both multi plexers are controlled by bit 1 in the control register MAX9777 or by the IN1 2 pin MAX9778 A logic low selects input IN 1 and logic high selects input IN 2 The input multiplexer can also be used to further expand the number of gain options available from the MAX9777 MAX9778 family Connecting the audio source to the device through two different input resis tors Figure 1 increases the number of gain options from two to four Additionally the input multiplexer allows a speaker equalization network to be switched into the speaker signal pat
32. rams appear at end of data sheet Simplified Block Diagram NGLE SUPPLY 4 5V TO 5 5V LEFT IN1 m LEFT IN2 o E SE BTL Ls RIGHT IN1 RIGHT IN2 v CONTROL Pc COMPATIBLE MAXIM MAX9777 Maxim Integrated Products 1 For pricing delivery and ordering information please contact Maxim Dallas Direct at 1 888 629 4642 or visit Maxim s website at www maxim ic com 8ZZ6XVW ZLZZ6XVIN MAX9777 MAX9778 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux ABSOLUTE MAXIMUM RATINGS Vpp o GND entm secet te eem m edt 6V Continuous Power Dissipation TA 70 PVpp to Vpp 28 Pin TQFN Multilayer Board PGND to GND derate 34 5mW C above 70 2758 6mW All Other Pins to 0 3V to Vpp 0 3V Operating Temperature Range 40 to 85 Continuous Input Current into any pin except power supply Storage Temperature Range 2769 C to 150 C and output pitis oet ee aie 20 Junction o rtp te m oes 150 C OUT__ Short Circuit to GND VDD 10s Lead Temperature soldering 105 300 C Short Circuit Between OUT_ and OUT Continuous Stresses beyond those lis
33. ressed Spike Note 1 All devices are 100 production tested at 25 C All temperature limits are guaranteed by design Note 2 Inputs AC coupled to GND Note 3 A master device must provide a hold time of at least 300ns for the SDA signal to bridge the undefined region of SCL s falling edge Note 4 Cg total capacitance of one of the bus lines in picofarads Device tested with Cg 400pF 1kQ pullup resistors connected from SDA SCL to Vpp Note 5 Input filters on SDA SCL and ADD suppress noise spikes of less than 50ns Note 6 Headphone mode testing performed with 320 resistive load connected to GND Speaker mode testing performed with 8Q resistive load connected to GND Mode transitions are controlled by SHDN KCP level is calculated as 20log peak voltage during mode transition no input signal 1Vnws Units are expressed in MAXIM Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Typical Operating Characteristics PVpp 5V GND PGND OV VSHDN 5V CBiAS 1uF TA 25 C unless otherwise noted TOTAL HARMONIC DISTORTION PLUS NOISE vs FREQUENCY SPEAKER MODE Ri 32 Ay NN MAX9777 78 10001 0 1 Pour 500 Pour 1W THD N 0 01 Pout 2W Pour 2 5W 0 001 10 100 1k 10k 100k FREQUENCY Hz TOTAL HARMONIC DISTORTION PLUS NOISE vs FREQUENCY SPEAKER MODE 1 RL 4Q A
34. ted under Absolute Maximum Ratings may cause permanent damage to the device These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied Exposure to absolute maximum rating conditions for extended periods may affect device reliability ELECTRICAL CHARACTERISTICS Vpp PVpp 5 0V GND PGND OV VSHDN 5V 1pF Rin 15kQ RL TA Tmin to Tmax unless otherwise noted Typical values are at Ta 25 C Note 1 PARAMETER SYMBOL CONDITIONS Supply Voltage Range Vpp PVpp Inferred from PSRR test Quiescent Supply Current BTL mode HPS OV MAX9777 MAX9778 IVDD IPVDD m Single ended mode HPS Vpp ISHDN SHDN GND Shutdown Current CBIAS 1pF CBIAS O 1uF Turn On Time ton Switching Time tsw Gain or input switching Thermal Shutdown Threshold Thermal Shutdown Hysteresis OUTPUT AMPLIFIERS SPEAKER MODE HPS GND Output Offset Voltage vos OUT_ OUT_ Av 1VV Vpp 4 5V to 5 5V f 1kHz VnippLE 200mVp p f 20kHz VRIPPLE 200mVp p Power Supply Rejection Ratio Note 2 fin 1kHz Ri POUT THD N lt 1 RL 40 TA 25 C RL 3Q Output Power Total Harmonic Distortion Plus fin 1kHz BW Pout IW RL 8Q THD N Noise 22Hz to 22kHz Pour 2W RL 4Q Signal to Noise R
35. tiple audio sources to be selected The multiplexer can also be used to compensate for limitations in the frequency response of the loud speakers by selecting an external equalizer network The various functions are controlled by either an I2C compatible MAX9777 or simple parallel control interface MAX9778 The MAX9777 MAX9778 are available in a thermally efficient 28 pin thin QFN package 5mm x 5mm x 0 8mm These devices have thermal overload protec tion OVP and are specified over the extended 40 C to 85 temperature range Applications Notebooks PC Audio Peripherals Portable DVD Players Camcorders Tablet PCs Multimedia Monitor MAKIM MAXIM Features Industry Leading Ultra High 100dB PSRR 3W BTL Stereo Speaker Amplifier 200mW Stereo Headphone Amplifier Low 0 002 THD N Click and Pop Suppression ESD Protected Outputs Low Quiescent Current 13mA Low Power Shutdown Mode 10 MUTE Function Headphone Sense Input Stereo 2 1 Input Multiplexer Optional 2 Wire I2C Compatible or Parallel Interface Tiny 28 Pin Thin QFN bmm x 5mm x 0 8mm Package 9 9 9 99 9 9 99 9 9 Ordering Information CONTROL PIN PKG INTERFACE PACKAGE CODE ETl 12C Compatible 28 Thin QFN EP T2855 6 9778 Parallel 28 Thin QFN EP T2855 6 Note All devices are specified over the 40 C to 85 C operat ing temperature range Denotes lead free package EP Exposed paddle Pin Configurations and Functional Diag
36. tive Low Shutdown Input Connect SHDN to Vpp for normal operation Address Select A logic high sets the address LSB to 1 a logic low sets the address LSB to zero Headphone Sense Input A logic high configures the device as a single ended headphone amp A logic low configures the device as a BTL speaker amp DC Bias Bypass Terminal See the BIAS Capacitor section for capacitor selection Connect from BIAS to GND GND Ground Connect to PGND INR1 ight Channel Input 1 BIAS INR2 i hannel Input 2 GAINRA i hannel Gain Set A GAINRB i hannel Gain Set B nnel Bridged Amplifier Positive Output OUTR also serves as the nel headphone amplifier output OUTR OUTR i nnel Bridged Amplifier Negative Output SCL ial Clock Line MUTE Active High Mute Input Headphone Enable A logic high enables HPS A logic low disables HPS and the device is always configured as a BTL speaker amplifier HPS_EN Gain Select A logic low selects the gain set by GAIN_A A logic high th gain set by GAIN B Input Select A logic low selects amplifier input 1 A logic high selects amplifier input 2 EP Exposed Paddle Connect to GND IN1 2 MAKIAN M o 1 8126XVW Z2Z26XVM MAX9777 MAX9778 Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Detailed Description The MAX9777 MAX9778 feature 3W BTL speaker amplifiers
37. ux Typical Operating Characteristics continued PVpp 5V GND PGND OV VSHDN 5V CBiAS 1pF TA 25 C unless otherwise noted MAX9777 MAX9778 10 POWER DISSIPATION W 050 075 100 1 25 1 50 UTPUT POWER W OUT_ AND OUT 1V div OUT OUT 1V div SUPPLY CURRENT vs SUPPLY VOLTAGE SUPPLY CURRENT vs SUPPLY VOLTAGE HEADPHONE MODE HEADPHONE MODE 12 12 2 E 85 TA 85 8 8 E 2 E x TA 25 C Ta 25 C amp 4 a 4 D Ta 40 C G Ta 40 C 2 2 0 0 4 50 4 75 5 00 5 25 5 50 4 50 4 75 5 00 5 25 5 50 SUPPLY VOLTAGE V SUPPLY VOLTAGE V POWER DISSIPATION vs OUTPUT POWER EXITING POWER DOWN SPEAKER MODE SPEAKER MODE MAX9777 78 toc43 E 0 8 VoD 2V div 100ms div Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux Pin Description PIN MAX9777 MAX9778 NAME FUNCTION ial Data I O Interrupt Output Power Supply Input Left Channel Input 1 Left Channel Input 2 Left Channel Gain Set A Left Channel Gain Set B 9 13 23 27 9 13 23 27 Power Ground Connect to GND Left Channel Bridged Amplifier Positive Output OUTL also serves as the left channel headphone amplifier output put Amplifier Power Supply Channel Bridged Amplifier Negative Output Ac
38. y 4VN MAX9777 78 toc04 04 Pour 250mW Pour 500mW THD N 30 0 01 0 001 10 100 1k 10k 100k FREQUENCY Hz TOTAL HARMONIC DISTORTION PLUS NOISE vs OUTPUT POWER SPEAKER MODE 100 Ay 2V V 3Q MAX9777 78 toc07 10 THDAN 30 0 1 0 01 0 001 0 1 2 3 4 OUTPUT POWER W TOTAL HARMONIC DISTORTION PLUS NOISE vs FREQUENCY SPEAKER MODE RL 3Q Ay 4VN MAX9777 78 toc02 0 1 Pour 500mW Pour 1W THD N 96 0 01 Pour 2W Pour 2 5W 0 001 10 100 1k 10k 100k FREQUENCY Hz TOTAL HARMONIC DISTORTION PLUS NOISE vs FREQUENCY SPEAKER MODE 1 8Q Ay 2VN MAX9777 78 toc05 0 1 THD4N 50 Pour 250mW pour 500mW 001 Poyr 1W Pour 1 2W 0 001 10 100 1k 10k 100k FREQUENCY Hz TOTAL HARMONIC DISTORTION PLUS NOISE vs OUTPUT POWER SPEAKER MODE 100 Ay 32 MAX9777 78 toc08 10 THD N 0 1 0 01 0 001 0 1 2 3 4 OUTPUT POWER W TOTAL HARMONIC DISTORTION PLUS NOISE vs FREQUENCY SPEAKER MODE 0 HE Ay 2VNV E 5 01 E Pour 250mW Poy 500mW 0 01 Pour 1W Pour 2W 0 001 10 100 1k 10k 100k FREQUENCY Hz TOTAL HARMONIC DISTORTION PLUS NOISE vs FREQUENCY SPEAKER MODE 1 R 8Q HE Ay AUN HS 2 01 Pour 250mW 500mW 0 01 Pour 1W Pout 1 2W 0 001 10 100 1k 10k 100k FREQUENCY Hz TOTAL HARMONIC DISTORTION PLUS NOISE vs OUTP
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