Philips TDA8944J User's Manual
Contents
1. IN1 and IN1 12and9 IN2 and IN2 Voc y Voc 1 5kQ 15kQ Voc L L 8 9 l 6 12 45 kQ 45 kQ i 1 2Vocg i SVR MGL946 1 and 4 OUT1 and OUT1 14 and 17 OUT2 and OUT2 100 a 402 1 2 Voc 10 MODE Voc Voc i aA 10 kQ 1 kQ 1 kQ a 10 ka O Pat OFF MUTE HIGH HIGH A A 7 MGL949 11 SVR Voc Standby 4 20 kQ i a MGL948 7z Product specification Philips Electronics N V 2000 All rights reserved Rev 02 14 February 2000 12 of 21 Philips Semiconductors TDA8944J 14 Application information 2 x 7 W stereo BTL audio amplifier Rs 220 nF IN1 11 Symmetrical B input Ci 1 5 nF 220 nF 220 nF I SHORT CIRCUIT AND TEMPERATURE PROTECTION 100 nF ee sae 1 OUT1 m RL 89 4 OUT1 14 OUT2 17 OUT2 Rs IN1 Asymmetrical a input Ci IN2 1k 220 nF signal GND 15 nF Voc IN2 R MODE STANDBY I MUTE LOGIC C1 20 KQ MICROCONTROLLER signal SVR 1 2 Vcc T GND 10 T pF 20 kQ MODE C1 C2 Standby 0 0 Mute 0 1 On 1 0 Fig 14 Application diagram GND MGL2. Fig 11 Power dissipation as function of output power 9397 750 06861 Philips Electronics N V 2000 All rights reserved Product specification Rev 02 14 February 2000 10 of 21 Philips Semiconductors TDA8944J 2 x 7 W stereo BTL audio amplifier 0 MGL958 Ocs dB 20 40 60 80 100 10 102 108 104 105 Hz No bandpass filter applied Fig 12 Channel separation as function of frequency 0 MGL956 SVRR dB 20 40 B CH2 60 CH1 A 80 10 102 108 104 105 f Hz Vcc 12 V Rg 0 Q Viippie 707 mV peak to peak no bandpass filter applied Curves A inputs short circuited Curves B inputs short circuited and connected to ground asymmetrical application Fig 13 Supply voltage ripple rejection as function of frequency 9397 750 06861 Philips Electronics N V 2000 All rights reserved Product specification Rev 02 14 February 2000 11 of 21 Philips Semiconductors TDA8944J 2 x 7 W stereo BTL audio amplifier 13 Internal circuitry Table 9 Internal circuitry 6 and 8
3. MGL957 Fig 6 Total harmonic distortion as function of output power VMODE V Fig 5 Output voltage as function of mode voltage 102 MGL952 i MGL953 THD THD 10 1 Po 0 1W 1 1W 10 1 10 1 102 10 2 2 10 10 102 108 104 105 Hz No bandpass filter applied Fig 7 Total harmonic distortion as function of frequency 9397 750 06861 Philips Electronics N V 2000 All rights reserved Product specification Rev 02 14 February 2000 9 of 21 Philips Semiconductors TDA8944J 2 x 7 W stereo BTL audio amplifier MGL959 MGL960 20 20 Po Prot W W 16 19 12 12 RL 8Q RL 82 8 8 162 162 4 4 0 0 0 4 8 12 16 20 0 4 8 12 16 20 Vcc V Vcc V THD 10 Fig 8 Output power as function of supply voltage Fig 9 Total power dissipation as function of supply voltage 100 MGL962 10 MGL961 n P W 80 8 RL 82 RL 162 60 6 82 162 40 4 20 2 0 0 0 2 4 6 8 10 0 2 4 6 8 10 Po W Po W Voc 12 V Fig 10 Efficiency as function of output power
4. 12 16 20 VMODE V 12 Dynamic characteristics Table 8 Dynamic characteristics Voc 12 V Tamb 25 C R 8 Q f 1 kHz Vmope 0 V measured in test circuit Figure 14 audio pass band 22 Hz to 22 kHz unless otherwise specified Po output power THD total harmonic distortion Gy voltage gain Ziit differential input impedance Vaio noise output voltage SVRR supply voltage ripple rejection Vovmute output voltage Qs channel separation THD 10 THD 0 5 Po 1W fripple 1 kHz fripple 100 Hz to 20 kHz mute mode Rg 02 31 70 1 2 50 2 3 50 5 Ww 0 03 0 1 32 33 dB 90 110 ko 90 120 uV 65 z dB 60 dB 50 uV 75 dB 1 The noise output voltage is measured at the output in a frequency range from 20 Hz to 20 kHz unweighted with a source impedance Rs 0 Q at the input 2 Supply voltage ripple rejection is measured at the output with a source impedance Rs 0 Q at the input The ripple voltage is a sine wave with a frequency frippie and an amplitude of 707 mV RMS which is applied to the positive supply rail 3 Output voltage in mute mode is measured with an input voltage of 1 V RMS in a bandwidth of 20 kHz so including noise 9397 750 06861 Philips Electronics N V 2000 All rights reserved Product specification Rev 02 14 February 2000 8 of 21 Philips Semiconductors TDA8944J 2 x 7 W stereo BTL audio amplifier
5. A2 Lm A DIMENSIONS mm are the original dimensions UNIT A A2 bp c DM d Dh 4 6 24 0 4 4 23 6 19 Note 1 Plastic or metal protrusions of 0 25 mm maximum per side are not included OUTLINE REFERENCES EUROPEAN PROJECTION ISSUE DATE VERSION JEDEC EIAJ 974246 E 99 12 17 SOT243 1 Fig 16 DBS17P package outline Philips Electronics N V 2000 All rights reserved 16 of 21 9397 750 06861 Product specification Rev 02 14 February 2000 Philips Semiconductors TDA8944J 17 Soldering 2 x 7 W stereo BTL audio amplifier 9397 750 06861 17 1 17 2 17 3 17 4 Introduction to soldering through hole mount packages This text gives a brief insight to wave dip and manual soldering A more in depth account of soldering ICs can be found in our Data Handbook IC26 Integrated Circuit Packages document order number 9398 652 90011 Wave soldering is the preferred method for mounting of through hole mount IC packages on a printed circuit board Soldering by dipping or by solder wave The maximum permissible temperature of the solder is 260 C solder at this temperature must not be in contact with the
6. gt changed to both channels driven e Table 7 on page 7 Vyope mute mode value Min 2 5 changed to 3 V e Table 8 on page 8 SVRR Typ values 65 and 60 dB added Acs Typ value 75 dB added e Figure 3 to 13 figures added e Section 13 Internal circuitry on page 12 gt added e Figure 14 figure adjusted e Section 14 1 Printed circuit board PCB on page 13 added e Figure 15 figure added e Section 14 2 Thermal behaviour and heatsink calculation on page 15 added e Section 15 2 Test conditions on page 15 added 01 990414 Preliminary specification initial version 9397 750 06861 Philips Electronics N V 2000 All rights reserved Product specification Rev 02 14 February 2000 18 of 21 Philips Semiconductors TDA8944J 19 Data sheet status 2 x 7 W stereo BTL audio amplifier Objective specification Development This data sheet contains the design target or goal specifications for product development Specification may change in any manner without notice Preliminary specification Qualification This data sheet contains preliminary data and supplementary data will be published at a later date Philips Semiconductors reserves the right to make changes at any time without notice in order to improve design and supply the best possible product Product specification Production This data sheet contains final specifications P
7. 2002 eee 19 Philips Electronics N V 2000 Printed in The Netherlands All rights are reserved Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner The information presented in this document does not form part of any quotation or contract is believed to be accurate and reliable and may be changed without notice No liability will be accepted by the publisher for any consequence of its use Publication thereof does not convey nor imply any license under patent or other industrial or intellectual property rights Date of release 14 February 2000 Document order number 9397 750 06861 2 x 7 W stereo BTL audio amplifier PHILIPS Let make things beter
8. 0020 eee 5 8 3 Mode selection 0 2000 e eee eee 5 8 3 1 Switch on and switch off 6 8 4 Supply Voltage Ripple Rejection SVRR 6 8 5 Built in protection circuits 6 8 5 1 Short circuit protection 6 8 5 2 Thermal shutdown protection 6 9 Limiting values 0 7 10 Thermal characteristics 7 11 Static characteristics 7 12 Dynamic characteristics 8 13 Internal circuitry 0 12 14 Application information 13 14 1 Printed circuit board PCB 13 14 1 1 Layout and grounding 13 14 1 2 Power supply decoupling 14 14 2 Thermal behaviour and heatsink calculation 15 15 Test information 0 15 15 1 Quality information 0055 15 15 2 Test conditions 0000 eee 15 16 Package outline 16 17 Soldering 0 0 e eee eee eee 17 17 1 Introduction to soldering through hole mount PACKAGES icici akie sg Abe deed home pees 17 17 2 Soldering by dipping or by solder wave 17 17 3 Manual soldering 000 17 17 4 Package related soldering information 17 18 Revision history 0 18 19 Data sheet status 19 20 Definitions 000 00 19 21 Disclaimers
9. W Rth h a Rihtot Rth j mb 12 5 6 9 5 6 KW The calculation above is for an application at worstcase stereo sine wave output signals In practice music signals will be applied which decreases the maximum power dissipation to approximately half of the sine wave power dissipation see Section 8 2 2 This allows for the use of a smaller heatsink Px Rthitot 100 C Rinto 100 4 25 K W Rinih a Penton Ring mb 25 6 9 18 1 KAN To increase the lifetime of the IC Tmax should be reduced to 125 C This requires a heatsink of approximately 12 K W for music signals 15 Test information 15 1 15 2 9397 750 06861 Quality information The General Quality Specification for Integrated Circuits SNW FQ 611D is applicable Test conditions Tamb 25 C Voc 12 V f 1 kHz RL 8 Q audio pass band 22 Hz to 22 kHz unless otherwise specified Remark In the graphs as function of frequency no bandpass filter was applied see Figure 7 12 and 13 Philips Electronics N V 2000 All rights reserved Product specification Rev 02 14 February 2000 15 of 21 TDA8944J Philips Semiconductors 2 x 7 W stereo BTL audio amplifier 16 Package outline DBS17P plastic DIL bent SIL power package 17 leads lead length 12 mm SOT243 1 non concave x UUUUUUUUWUUUUUUUU view B mounting base side
10. joints for more than 5 seconds The total contact time of successive solder waves must not exceed 5 seconds The device may be mounted up to the seating plane but the temperature of the plastic body must not exceed the specified maximum storage temperature T stg max If the printed circuit board has been pre heated forced cooling may be necessary immediately after soldering to keep the temperature within the permissible limit Manual soldering Apply the soldering iron 24 V or less to the lead s of the package either below the seating plane or not more than 2 mm above it If the temperature of the soldering iron bit is less than 300 C it may remain in contact for up to 10 seconds If the bit temperature is between 300 and 400 C contact may be up to 5 seconds Package related soldering information Table 10 Suitability of through hole mount IC packages for dipping and wave soldering methods DBS DIP HDIP SDIP SIL suitable suitable 1 1 For SDIP packages the longitudinal axis must be parallel to the transport direction of the printed circuit board Philips Electronics N V 2000 All rights reserved Product specification Rev 02 14 February 2000 17 of 21 Philips Semiconductors TDA8944J 2 x 7 W stereo BTL audio amplifier 18 Revision history Table 11 Sars 02 000214 Product specification second version supersedes initial version TDA8944J 01 of 14 April 1999 9397 750 04881 Mo
11. 1 2333 Fax 55 11 829 1849 Spain Tel 34 33 01 6312 Fax 34 33 01 4107 Sweden Tel 46 86 32 2000 Fax 46 86 32 2745 Switzerland Tel 41 14 88 2686 Fax 41 14 81 7730 Taiwan Tel 886 22 134 2865 Fax 886 22 134 2874 Thailand Tel 66 27 45 4090 Fax 66 23 98 0793 Turkey Tel 90 216 522 1500 Fax 90 216 522 1813 Ukraine Tel 380 44 264 2776 Fax 380 44 268 0461 United Kingdom Tel 44 208 730 5000 Fax 44 208 754 8421 United States Tel 1 800 234 7381 Uruguay see South America Vietnam see Singapore Yugoslavia Tel 381 11 3341 299 Fax 381 11 3342 553 Internet http Awww semiconductors philips com SCA69 Philips Electronics N V 2000 All rights reserved Product specification Rev 02 14 February 2000 20 of 21 Philips Semiconductors TDA8944J Contents 1 General description 1 2 Features sss ces4e bei beer eee ae be 1 3 Applications 000 000 1 4 Quick reference data 1 5 Ordering information 2 6 Block diagram 00 0 ee 2 7 Pinning information 3 7 1 PINNING ee csere oos akan eked e vee kd 3 7 2 Pin description 002002 ee eee 3 8 Functional description 4 8 1 Input configuration 000 4 8 2 Power amplifier 0 005 5 8 2 1 Output power measurement 5 8 2 2 Headroom
12. 950 14 1 14 1 1 9397 750 06861 Printed circuit board PCB Layout and grounding For a high system performance level certain grounding techniques are essential The input reference grounds have to be tied with their respective source grounds and must have separate tracks from the power ground tracks this will prevent the large output signal currents from interfering with the small AC input signals The small signal ground tracks should be physically located as far as possible from the power ground tracks Supply and output tracks should be as wide as possible for delivering maximum output power Philips Electronics N V 2000 All rights reserved Product specification Rev 02 14 February 2000 13 of 21 Philips Semiconductors TDA8944J 9397 750 06861 2 x 7 W stereo BTL audio amplifier lt 54 mm z O Oo 9 oF a AY oO D 0 pa fe ILe A Xp Q O S6 o mm oo OO away gt a o Q EUT O no o OUT2 ON MUTE q O ouT2t IN2 220 nF a oS n2 p 1 5 nF lend CO Moo nv a Le Sik O ins Voc 000 LF GND OC out 5 O MGL951 Fig 15 Printed circuit board layout single sided components view 14 1 2 Power supply decoupling Proper supply bypassing is critical for low noise performance and high supply voltage ripple rejection The respective capacitor locations should be as close as possible to the device
13. TDA8944J 2 x 7 W stereo Bridge Tied Load BTL audio amplifier Rev 02 14 February 2000 Product specification 1 General description The TDA8944J is a dual channel audio power amplifier with an output power of 2x7 W at an 8 Q load anda 12 V supply The circuit contains two Bridge Tied Load BTL amplifiers with an all NPN output stage and standby mute logic The TDA8944J comes in a 17 pin DIL bent SIL DBS power package The TDA8944u is printed circuit board PCB compatible with all other types in the TDA894x family One PCB footprint accommodates both the mono and the stereo products 2 Features Few external components Fixed gain Standby and mute mode No on off switching plops Low standby current High supply voltage ripple rejection Outputs short circuit protected to ground supply and across the load Thermally protected Printed circuit board compatible 3 Applications E Mains fed applications e g TV sound E PC audio E Portable audio 4 Quick reference data Table 1 Quick reference data Voc supply voltage 6 12 18 V lq quiescent supply current Voc 12 V RL 24 36 mA Isto standby supply current 3 10 uA PHILIPS Philips Semiconductors TDA8944J 2 x 7 W stereo BTL audio amplifier Table 1 Quick reference data continued Po output power THD 10 RL 8 Q 6 7 Ww Vcc 12V THD total harmonic distortion Po 1 W 0 03 0 1 Gy voltage gain 31 32 33 dB SVRR sup
14. able 7 Static characteristics Voc 12 V Tamb 25 C Ry 8 Q Vmope 0 V Vi 0 V measured in test circuit Figure 14 unless otherwise specified Voc supply voltage operating 6 12 18 V Ig quiescent supply current RL lt ml 24 36 mA Ist standby supply current Vmope Vcc 10 uA Vo DC output voltage 2 6 V AVourt 3 differential output voltage offset 200 mV VMODE mode selection input voltage operating mode 0 0 5 V mute mode 3 Vec 1 5 V standby mode Vcc 0 5 Vec V IMODE mode selection input current 0 lt Vmone lt Vcc 20 uA 1 With a load connected at the outputs the quiescent current will increase the maximum of this increase being equal to the differential output voltage offset AVour divided by the load resistance R1 2 The DC output voltage with respect to ground is approximately 0 5Vcc 3 AVout Vout Vour 9397 750 06861 Philips Electronics N V 2000 All rights reserved Product specification Rev 02 14 February 2000 7 of 21 Philips Semiconductors TDA8944J 2 x 7 W stereo BTL audio amplifier 50 MGL954 mA 40 30 20 0 4 8 12 16 voltage 20 Voc V Fig 3 Quiescent current as function of supply Fig 4 50 mA 40 30 20 10 Quiescent current as function of mode voltage MGL955 Voc 12V
15. and grounded to the power ground Proper power supply decoupling also prevents oscillations For suppressing higher frequency transients spikes on the supply line a capacitor with low ESR typical 100 nF has to be placed as close as possible to the device For suppressing lower frequency noise and ripple signals a large electrolytic capacitor e g 1000 uF or greater must be placed close to the device The bypass capacitor on the SVR pin reduces the noise and ripple on the midrail voltage For good THD and noise performance a low ESR capacitor is recommended Philips Electronics N V 2000 All rights reserved Product specification Rev 02 14 February 2000 14 of 21 Philips Semiconductors TDA8944J 2 x 7 W stereo BTL audio amplifier 14 2 Thermal behaviour and heatsink calculation The measured maximum thermal resistance of the IC package Rin j mp is 6 9 K W A calculation for the heatsink can be made with the following parameters Tamb max 50 C Voc 12 V and RL 8Q Tj max 150 C Rinitot is the total thermal resistance between the junction and the ambient including the heatsink In the heatsink calculations the value of Rth mb n is ignored At Vcc 12 V and R 8 the measured worstcase sine wave dissipation is 8 W see Figure 11 For Tjmax 150 C the temperature raise caused by the power dissipation is 150 50 100 C P x Rihitot 100 C Rthitot 100 8 12 5 K
16. arging of the input capacitors can be minimized This results in a good low frequency response and good switch on behaviour Remark To prevent HF oscillations do not leave the inputs open connect a capacitor of at least 1 5 nF across the input pins close to the device Philips Electronics N V 2000 All rights reserved Product specification Rev 02 14 February 2000 4 of 21 Philips Semiconductors TDA8944J 9397 750 06861 8 2 8 2 1 8 2 2 8 3 2 x 7 W stereo BTL audio amplifier Power amplifier The power amplifier is a Bridge Tied Load BTL amplifier with an all NPN output stage capable of delivering a peak output current of 2 A The BTL principle offers the following advantages e Lower peak value of the supply current e The ripple frequency on the supply voltage is twice the signal frequency e No expensive DC blocking capacitor e Good low frequency performance Output power measurement The output power as a function of the supply voltage is measured on the output pins at THD 10 see Figure 8 The maximum output power is limited by the maximum supply voltage of 12 V and the maximum available output current 2 A repetitive peak current Headroom Typical CD music requires at least 12 dB factor 15 85 dynamic headroom compared to the average power output for transferring the loudest parts without distortion At Vcc 12 V RL 8 Q and Po 4 W at THD 0 1 see Figure 6 the Averag
17. difications e Table 1 on page 1 SVRR Typ value 65 dB added e Figure 1 on page 2 Block diagram pin numbers changed OUT2 14 and OUT2 17 Revision history e Figure 2 on page 3 Pin configuration pin numbers changed OUT2 gt 14 and OUT2 17 e Section 8 Functional description Section 8 1 Input configuration on page 4 added Section 8 2 Power amplifier on page 5 capable of delivering a peak output current of 1 5 A changed to 2 A Section 8 2 1 Output power measurement on page 5 gt added Section 8 2 2 Headroom on page 5 added e Section 8 3 Mode selection Standby mode Vuope gt Vcc 0 5 V changed to Vcc 0 5 V lt Vyope lt Vcc The power consumption of the TDA8944J will be reduced to lt 0 18 mW added Mute mode the DC level of the input and output pins remain on half the supply voltage added 2 5 V lt Vmope lt Vcc 1 5 V gt changed to 3 V lt Vyope lt Vcc 1 5 V Section 8 3 1 Switch on and switch off on page 6 e Section 8 4 Supply Voltage Ripple Rejection SVRR on page 6 gt added e Section 8 5 Built in protection circuits on page 6 added e Table 5 on page 7 Piot value added 18 V Vcc sc value added 15 V e Table 6 on page 7 Rihj a Value added 40 K W Rihj c value 10 changed to 6 9 K W condition in free air
18. e Listening Level ALL music power without any distortion yields Poiat 4 W 15 85 252 mW The power dissipation can be derived from Figure 11 on page 10 for 0 dB respectively 12 dB headroom Table 4 Power rating as function of headroom om er output THD 0 1 Pow 0 dB Po 4W 8W 12 dB Po ALL 252 mW 4W For the average listening level a power dissipation of 4 W can be used for a heatsink calculation Mode selection The TDA8944J has three functional modes which can be selected by applying the proper DC voltage to pin MODE See Figure 4 and 5 for the respective DC levels which depend on the supply voltage level The MODE pin can be driven by a 3 state logic output stage e g a microcontroller with additional components for DC level shifting Standby In this mode the current consumption is very low and the outputs are floating The device is in standby mode when Vcc 0 5 V lt Vuope lt Vcc or when the MODE pin is left floating high impedance The power consumption of the TDA8944J will be reduced to lt 0 18 mW Philips Electronics N V 2000 All rights reserved Product specification Rev 02 14 February 2000 5 of 21 Philips Semiconductors TDA8944J 2 x 7 W stereo BTL audio amplifier Mute In this mode the amplifier is DC biased but not operational no audio output the DC level of the input and output pins remain on half the supply voltage This allow
19. erence between both currents larger than 0 4 A switches the power stage to standby mode high impedance Short circuit across the load This is detected by an absolute current measurement An absolute current larger than 2 A switches the power stage to standby mode high impedance 8 5 2 Thermal shutdown protection The junction temperature is measured by a temperature sensor at a junction temperature of approximately 150 C this detection circuit switches the power stage to standby mode high impedance 9397 750 06861 Philips Electronics N V 2000 All rights reserved Product specification Rev 02 14 February 2000 6 of 21 Philips Semiconductors TDA8944J 2 x 7 W stereo BTL audio amplifier 9 Limiting values Table 5 Limiting values In accordance with the Absolute Maximum Rating System IEC 60134 Voc supply voltage no signal 0 3 25 V operating 0 3 18 V VI input voltage 0 3 Voc 0 3 V loRM repetitive peak output current 2 A Tstg storage temperature non operating 55 150 C Tamb operating ambient temperature 40 85 C Piot total power dissipation 18 Ww Vec sc supply voltage to guarantee short circuit 15 V protection 10 Thermal characteristics Table 6 Thermal characteristics Rih a thermal resistance from junction to ambient in free air 40 K W Rth mb thermal resistance from junction to mounting base both channels driven 6 9 K W 11 Static characteristics T
20. hilips Semiconductors TDA8944J 2 x 7 W stereo BTL audio amplifier Table 3 Pin description continued n c 13 not connected OUT2 14 negative loudspeaker terminal 2 GND2 15 ground channel 2 Voce 16 supply voltage channel 2 OUT2 17 positive loudspeaker terminal 2 8 Functional description 8 1 9397 750 06861 The TDA8944J is a stereo BTL audio power amplifier capable of delivering 2 x 7 W output power to an 8 Q load at THD 10 using a 12 V power supply and an external heatsink The voltage gain is fixed at 32 dB With the three level MODE input the device can be switched from standby to mute and to operating mode The TDA8944J outputs are protected by an internal thermal shutdown protection mechanism and a short circuit protection Input configuration The TDA8944J inputs can be driven symmetrical floating as well as asymmetrical In the asymmetrical mode one input pin is connected via a capacitor to the signal ground which should be as close as possible to the SVR electrolytic capacitor ground Note that the DC level of the input pins is half of the supply voltage Vcc so coupling capacitors for both pins are necessary The input cut off frequency is _ 1 F itcut off 22 R KC For Ri 45 kQ and C 220 nF 1 ficcu 3 y 7 16Hz 2 2 45x10 x220x10 As shown in Equation 1 and 2 large capacitor values for the inputs are not necessary so the switch on delay during ch
21. hilips Semiconductors reserves the right to make changes at any time without notice in order to improve design and supply the best possible product 1 Please consult the most recently issued data sheet before initiating or completing a design 20 Definitions 21 Disclaimers Short form specification The data in a short form specification is extracted from a full data sheet with the same type number and title For detailed information see the relevant data sheet or data handbook Limiting values definition Limiting values given are in accordance with the Absolute Maximum Rating System IEC 60134 Stress above one or more of the limiting values may cause permanent damage to the device These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied Exposure to limiting values for extended periods may affect device reliability Application information Applications that are described herein for any of these products are for illustrative purposes only Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification 9397 750 06861 Life support These products are not designed for use in life support appliances devices or systems where malfunction of these products can reasonably be expected to result in pers
22. ombia see South America Czech Republic see Austria Denmark Tel 45 3 288 2636 Fax 45 3 157 0044 Finland Tel 358 961 5800 Fax 358 96 158 0920 France Tel 33 14 099 6161 Fax 33 14 099 6427 Germany Tel 49 40 23 5360 Fax 49 402 353 6300 Hungary see Austria India Tel 91 22 493 8541 Fax 91 22 493 8722 Indonesia see Singapore Ireland Tel 353 17 64 0000 Fax 353 17 64 0200 Israel Tel 972 36 45 0444 Fax 972 36 49 1007 Italy Tel 39 039 203 6838 Fax 39 039 203 6800 Japan Tel 81 33 740 5130 Fax 81 3 3740 5057 Korea Tel 82 27 09 1412 Fax 82 27 09 1415 Malaysia Tel 60 37 50 5214 Fax 60 37 57 4880 Mexico Tel 9 5 800 234 7381 Middle East see Italy For all other countries apply to Philips Semiconductors International Marketing amp Sales Communications Building BE P O Box 218 5600 MD EINDHOVEN The Netherlands Fax 31 40 272 4825 9397 750 06861 Netherlands Tel 31 40 278 2785 Fax 31 40 278 8399 New Zealand Tel 64 98 49 4160 Fax 64 98 49 7811 Norway Tel 47 22 74 8000 Fax 47 22 74 8341 Philippines Tel 63 28 16 6380 Fax 63 28 17 3474 Poland Tel 48 22 5710 000 Fax 48 22 5710 001 Portugal see Spain Romania see Italy Russia Tel 7 095 755 6918 Fax 7 095 755 6919 Singapore Tel 65 350 2538 Fax 65 251 6500 Slovakia see Austria Slovenia see Italy South Africa Tel 27 11 471 5401 Fax 27 11 471 5398 South America Tel 55 11 82
23. onal injury Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application Right to make changes Philips Semiconductors reserves the right to make changes without notice in the products including circuits standard cells and or software described or contained herein in order to improve design and or performance Philips Semiconductors assumes no responsibility or liability for the use of any of these products conveys no licence or title under any patent copyright or mask work right to these products and makes no representations or warranties that these products are free from patent copyright or mask work right infringement unless otherwise specified Philips Electronics N V 2000 All rights reserved Product specification Rev 02 14 February 2000 19 of 21 Philips Semiconductors TDA8944J 2 x 7 W stereo BTL audio amplifier Philips Semiconductors a worldwide company Argentina see South America Australia Tel 61 2 9704 8141 Fax 61 2 9704 8139 Austria Tel 43 160 101 Fax 43 160 101 1210 Belarus Tel 375 17 220 0733 Fax 375 17 220 0773 Belgium see The Netherlands Brazil see South America Bulgaria Tel 359 268 9211 Fax 359 268 9102 Canada Tel 1 800 234 7381 China Hong Kong Tel 852 2 319 7888 Fax 852 2 319 7700 Col
24. ply voltage ripple 50 65 dB rejection 5 Ordering information Table 2 Ordering information TDA8944J DBS17P plastic DIL bent SIL power package SOT243 1 17 leads lead length 12 mm 6 Block diagram Voc1 Yec2 OUT1 IN1 IN1 OUT1 TDA8944J OUT2 IN2 IN2 OUT2 MODE SHORT CIRCUIT SVR TEMPERATURE PROTECTION MBK933 GND1 GND2 Fig 1 Block diagram 9397 750 06861 Philips Electronics N V 2000 All rights reserved Product specification Rev 02 14 February 2000 2 of 21 Philips Semiconductors TDA8944J 7 Pinning information 2 x 7 W stereo BTL audio amplifier 9397 750 06861 7 1 Pinning Fig 2 Pin configuration MBK936 7 2 Pin description Table 3 Pin description OUT1 1 GND1 2 Voct 3 OUT1 4 n c 5 IN1 6 n C 7 IN1 8 IN2 9 MODE 10 SVR 11 IN2 12 negative loudspeaker terminal 1 ground channel 1 supply voltage channel 1 positive loudspeaker terminal 1 not connected positive input 1 not connected negative input 1 negative input 2 mode selection input standby mute operating half supply voltage decoupling ripple rejection positive input 2 Philips Electronics N V 2000 All rights reserved Product specification Rev 02 14 February 2000 3 of 21 P
25. s the input coupling and Supply Voltage Ripple Rejection SVRR capacitors to be charged to avoid pop noise The device is in mute mode when 3 V lt Vuope lt Vcc 1 5 V Operating In this mode the amplifier is operating normally The operating mode is activated at Vyope lt 0 5 V 8 3 1 Switch on and switch off To avoid audible plops during supply voltage switch on or switch off the device is set to standby mode before the supply voltage is applied switch on or removed switch off The switch on and switch off time can be influenced by an RC circuit on the MODE pin Rapid on off switching of the device or the MODE pin may cause click and pop noise This can be prevented by proper timing of the RC circuit on the MODE pin 8 4 Supply Voltage Ripple Rejection SVRR The SVRR is measured with an electrolytic capacitor of 10 uF on pin SVR ata bandwidth of 10 Hz to 80 kHz Figure 13 on page 11 illustrates the SVRR as function of the frequency A larger capacitor value on the SVR pin improves the ripple rejection behaviour at the lower frequencies 8 5 Built in protection circuits The TDA8944J contains two types of protection circuits i e short circuit and thermal shutdown 8 5 1 Short circuit protection Short circuit to ground or supply line This is detected by a so called missing current detection circuit which measures the current in the positive supply line and the current in the ground line A diff
Download Pdf Manuals
Related Search