2 FPAA board
Contents
1. B eR ne oe 2 5 2 3 E a en 9 9 9 0 9 di al 1 d 1 h i 7 Anadigm DualApez Development Board Analog Schematic mi GND a i l 44 rA GND a T fa ea dah led did ala alas PERAI 8 8 8 8 0 fh ff 8 8 6 6 Q 4 A VDD z Toor E 95 d oi Su GND Sara cp2 i voo OB Pos AA En aL D WA R36 R7 D4 NA ERRb dig Sai TIVATE dia rodas of uf of of of oo R gt 5 ERRE 4443 amp MNnOnSOHAKRWOKMNAT NOE CA aa L EREE g El id nes enos ro OND kariii 5 RC14 sosco AA Cc soka 4 Roe sck aer da a a Marroni RD11 INT4 B Neveyisy a RDIO INTA ElSpare e O Sestao p73 6 roe soo veo Ber e eeri sde je 1 voo rare osc s ree heals ls 100n osci Mi Out oxo Ll RBS ANS voo voo O 1g RBs sane o PE voo gi as 13 RB3 AN3 a 26 T z 9 re a E E wee PT Het e lo ay a veus nt 09 a eozano SI 3 SaaS 3 T c16 OND ADE zz Do 000z RF3 USBID C0603 Channels amp SS paee eenn cos x1 E 2 100p e 7 E TU DENI A lu 16MHz O DODAZZ ES AA amp NNOHDSSS HONWH Be B T GND O E 3 Kuni mo bd O cse chr Cotos chaps ike HE E voo Pipa ya lt C Ls El L Re ai ND ie Ed 10 32 E GND oo L A 2 TEA E ELLELED A e ono GND ACL KI dia E D E B A Draun2. UM231002 K001b Page 9 of 20 Anadigm DualApex Development Board Rauch Filter Component Values Parameters Rauch 1 101 R1 R2 22k0 G 1 0 R3 10kQ Q 0 707 C1 22pF Fo 490kHz C2 10pF Rauch 1 102 R1 R2 470k0 G 1 0 R3 220k0 Q 0 707 C1 22pF Fo 23kHz C2 10pF Table 2 Ready populated Rauch filters These 2 Rauch filters are provided ready populated as examples Rauch_ 1_101 is connected to 1 01 of FPAA 1 It is set up with a very high corner frequency and unity gain If using a single ended signal connect IN to GND see layout on the right of figure 4 and connect the signal to IN If a lower corner frequency is required it is very easy to modify this filter without removing the surface mount components beneath simply by adding through hole capacitors For example if a 2 2nF capacitor is added to C1 and 1nF capacitors added to C2a and C2b the corner frequency can be reduced to 4 9kHz increasing the capacitor values reduces corner frequency by the same factor Rauch 1 102 is connected to 1 02 of FPAA 1 It is set up with a unity gain and corner frequency of just over 20kHz which is typical of an audio application If using a single ended signal connect IN to GND see layout on the right of figure 4 and connect the signal to IN If a lower corner frequency is required it is very easy to modify this filter without removing the surface mount components beneath simply by adding through h
3. Check Projection N Do Not Scale D ES Anadign Drn Drn Drn Drn Project Client DualApex v1 0 Dave Lovell 2nd Sept 2014 UM231002 K001b Page 16 of 20 ERR GRE Chk ERE Title ELE Drawing No Sheet of oTL2 A3 Anadigm DualApex Development Board Notes UM231002 K001b Page 17 of 20 Anadigm DualApex Development Board Notes UM231002 K001b Page 18 of 20 Anadigm DualApex Development Board Notes UM231002 K001b Page 19 of 20 Anadigm DualApex Development Board Notes For More information Contact http www anadigm com support anadigm com UM231002 K001b Page 20 of 20
4. access points or digital pins J1 of FPAA access points FPAA Output Voltage Fout 0 5 3 6 V Direct output from FPAA on analog IO access points or digital pins J1 of FPAA access points Operating Temperature Top 10 50 C Ambient Operating Temperature Storage Temperature Tstg 20 70 C Ambient Storage Temperature UM231002 K001b Page 14 of 20 Anadigm DualApez Development Board Rauch Fi Analog Schematic lters FPAA DECOUPLING voo MENCLK ACTIVATE cFOFLO 14N YODO TaN 3 3v Wa PoP d UM231002 K001b Page 15 of 20 de co os E D e B A Draun Check Projection A par Do ner sese Q Ey Anadigm Dra Dra Dra Dra Project Client DualApex v1 Dave Lovell 2nd Sept 2014 chk The ThE chk Title Filename Drawing No Sheet or
5. all the components power connections and jumpers Switches to connect Digital Choice of header mper Ju Rauch filters to breadboard area for LCD display options FPAA inputs J 5000 0000 500000000 Rauch filter input 101 FPAA 2 3 3V supply Ground 09 3 3V supply y e to connect points points points FPAA outputs to buffers Figure 2 Top level layout of the Anadigm DualApex board UM231002 K001b Page 3 of 20 Anadigm DualApex Development Board 3 0 Powering up the Anadigm DualApex Development Board The options for powering up the board are as follows e Connect a transformer with centre voltage between 4V and 7V to the jack socket input OR e Connect wires from a single precision regulated supply to the on board 2 way terminal with the voltage set to between 4V and 7V NOTE the board is protected against connection to a supply with the wrong polarity NOTE2 The power supply jack socket specification is 5 5mm outer conductor 2 1mm inner connector inner or center connector is Positive WARNING the board should not be powered with more than 7V There is a green LED to indicate that the board is successfully powered up The board should take approximately 100mA when first powered up and before the AN231E04s FPAAs are configured The current after the FPAAs are configured depends very much on the circuit programmed into the FPAAs and how many FPAAs are configured If both of the FPAAs are configure
6. is typical of an audio application If a lower corner frequency is required it is very easy to modify this filter without removing the surface mount components beneath simply by adding through hole capacitors For example if 1 5nF capacitors are added to C1a and C1b the corner frequency can be reduced to 230Hz Alternatively if a higher corner frequency is required through hole resistors can be added again without removing the surface mount components beneath For example if 10kQ resistors are added to R1a Rib R2a and R2b the corner frequency can be increased to 1MHz reducing the resistor values increased the corner frequency by the same factor The other 2 out buffers are not populated at all so the user is free to design their own using the equations mentioned earlier If the user does not wish to use output buffers it is recommended to open the DIP switches connecting the buffer to the FPAA and connect directly to the FPAA pins using wires soldered to the labelled vias that surround each FPAA UM231002 K001b Page 11 of 20 Anadigm DualApex Development Board 6 0 Jumpers Table 4 shows a complete list of the jumpers on the board and figure 6 shows their positions mper Function AE Default State Connects the digital section to the analog section All 9 jumpers should be on IAA ee source Enables download of test configuration to both Jumper off FPAAs from FLASH after reset or power cycling Test circuit outputs sine wave to
7. is useful for removing clock noise and smoothing the quantisation of the output GND ref Single Ended Signal Differential Signal ref to VMR 2 Gain R2 R1 Fo 1 2 PLR2 C1 Figure 5 Output Buffer UM231002 K001b Page 10 of 20 Anadigm DualApex Development Board The equations for gain and corner frequency of the output buffer are as follows G R2 R1 Fo 1 2 1r R2 C1 For the use who wishes to use the board straight out of the box 2 of the output buffers are already populated with surface mount components underneath the board These are shown in table 3 Rauch Filter Component Values Parameters Buf 1 04 R1 33kO G 1 0 R2 33kO Fo 480kHz C1 10pF Buf 1 03 R1 470kO G 1 0 R2 470kO F 23kHz C1 15pF Table 3 Ready populated output buffers These 2 output buffers are provided ready populated as examples Buf_ 1_04 is connected to O4 of FPAA 1 It is set up with a very high corner frequency and unity gain If a lower corner frequency is required it is very easy to modify this filter without removing the surface mount components beneath simply by adding through hole capacitors For example if 1nF capacitors are added to C1a and C1b the corner frequency can be reduced to 4 8kHz increasing the capacitor values reduces corner frequency by the same factor Buf_ 1_O03 is connected to O3 of FPAA 1 It is set up with a unity gain and corner frequency of just over 20kHz which
8. label indicating that it is the Anadigm board so if the computer has other devices connected to COM ports real or virtual then there may be more than one COM port appearing in the drop down box In this case it may be necessary to do some trial and error to determine which port corresponds to the Anadgim board Select the appropriate COM port and check the box marked USB Click on Apply then click on OK To check that AD2 is now able to communicate with the board go to the Target menu and select Display Board Information Figure 3 shows what should be seen Board Info Anadigm DualApex Board v1 0 ABK Version 6 1 0 Rev Date 10 Dec 2014 Your current hardware configuration Hardware Load order chip type 2 AN231E04 1 AN231E04 Figure 3 Board information displayed by AD2 Figure 3 shows the information displayed by AD2 about the board where both FPAAs are set up in a chain If one FPAA only is set up then the board information will display only one FPAA For more information on how to set up different numbers of FPAAs see later It should now be possible to download a circuit from AD2 To do this simply click on the download icon to the left of the question mark beneath Dynamic Config Alternatively press Ctrl and W A yellow LED next to the microcontroller will flash as each FPAA is configured and finally a green LED will turn on to indicate that all FPAAs have been configured correctly A red LED will indica
9. on OK Figure 4 shows the amplifier as it appears in AD2 left a schematic showing how the components are connected middle and the layout of one of the Rauch filters provided on the board Type 1 Input Output Cell Type 1 I O Configured as an Input with Anti aliasing Filter Figure 4 Rauch Filter UM231002 K001b Page 8 of 20 Anadigm DualApex Development Board The equations for gain corner frequency and Q of the Rauch low pass filter are as follows G R2 R1 Fo 1 2 11 R2 x SQRT R1 R2 2 C1 C2 R1 Q SQRT C1 R1 2 C2 R1 R2 To determine component values for required values of gain corner frequency and Q first select a suitable value for R1 e g 10kQ and then use the following equations to calculate the other component values R2 R1 G R3 R1 G G 1 C1 Q G 1 2 1 G Fo R1 C2 1 4 11 G Fo Q R1 As an example suppose it is required to have the following parameters in the input stage Gain 1 5 Fo 20kHz Q 0 707 First a suitable value for R1 must be decided e g 10kQ Then using the equations for R2 R3 C1 and C2 we get R1 10kO R2 15kO R3 6kQ nearest preferred value is 5 6 kQ C1 0 938nF nearest preferred value is 1nF C2 0 375nF nearest preferred value is 330pF The preferred component values can be fed back into the original equations to determine the realised parameters There is an Excel spreadsheet provided by Anadigm that makes the whole process much simpler
10. place a jump wire between the pins marked VPP and GND on the programming header P7 next to the reset button Again all jumpers except ACLK should be removed from J1 In this case the PIC32 will be disabled but the FPAAs will continue to receive ACLK from the 16MHz oscillator module 5 8 Analog Clock The analog clock for the FPAAs ACLK is supplied from a 16MHz oscillator module Alternatively by placing a jumper on J2 the analog clock can be driven by a 40MHz clock from the PIC32 microcontroller NOTE1 the new clock frequency only takes effect after resetting the board NOTE2 if using the board in 40MHz analog clock mode the 16MHz oscillator module should not be disabled by placing a jumper on J5 The reason for this is that the PIC32 which generates the 40MHz clock is clocked by this oscillator module so the 40MHz clock is derived from it So stopping the 16MHz clock will stop the 40MHz clock 5 9 PIC32 Programming Header There is a standard 5 pin header P7 to the left of the reset button for re programming the PIC32 The pins are labelled on the board PGC PGD GND VDD VPP The PIC32 has 512KB program memory The default software that comes with the board called the Anadigm Boot Kernel ABK uses just 10 of this memory This software is available for download from the Anadigm website The user is free to develop his own embedded software 5 10 PIC32 ADC Channels amp User I Os The PIC32 microcontroller on the board has 16 pins b
11. Anadigm DualApex Development Board pi 11I000000000000000O co BREADBOARD ollo BD WE ger 1708 Figure 1 Anadigm DualApex Development Board Disclaimer Anadigm reserves the right to make any changes without further notice to any products herein Anadigm makes no warranty representation or guarantee regarding the suitability of its products for any particular purpose nor does Anadigm assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability including without limitation consequential or incidental damages Typical parameters can and do vary in different applications All operating parameters including Typical s must be validated for each customer application by customer s technical experts Anadigm does not in this document convey any license under its patent rights nor the rights of others Anadigm software and associated products cannot be used except strictly in accordance with an Anadigm software license The terms of the appropriate Anadigm software license shall prevail over the above terms to the extent of any inconsistency Anadigm Inc 2015 All Rights Reserved UM231002 K001b Page 1 of 20 1 0 Anadigm DualApex Development Board Overview The Anadigm DualApex development board is an easy to use platform designed to help you get started with implementing and testing your analog designs on the AnadigmApex FPAA silicon devices Furthermo
12. This can be downloaded from the Anadigm website NOTE1 if the input signal to the Rauch filter is single ended then simply connect the left side of one of the R1 resistors see schematic in figure 4 to ground NOTE2 for best noise results the low pass corner frequency should be set just above the highest frequency of the input signal NOTE3 for best noise results the gain should be set so that for the maximum amplitude of the input signal the output of the Rauch filter is just within 0 and 3V supply corresponding to a 3V 6V pk pk differential signal For example if the maximum input signal is 1V pk pk single ended then the gain should be set to 6 or just under NOTE4 the Rauch filter will not work unless the input amplifier is enabled in AD2 The board has footprints for 4 Rauch filters 2 to each FPAA The typical layout for these is shown on the right in figure 4 Note that there is only one C1 the other components 3 resistors and a capacitor are in pairs marked a and b and these pairs should always be identical The user is free to add through hole components to these Rauch footprints to make their own version none are populated with through hole components but 2 are populated with surface mount components see below For the user who wishes to use the board straight out of the box 2 of the Rauch filters are already populated with surface mount components underneath the board These are shown in table 2
13. all FPAA outputs Enables the storage of primary configurations in the Jumper on PIC32 s FLASH If the jumper is on the board will remember the last primary configuration after reset or power cycling If a configuration has not yet been sent from AD2 then the board will configure itself with blank circuits in both FPAAs If the jumper is removed and the board reset or power cycled the FLASH will be cleared A jumper on J5 will disable the 16MHz oscillator Jumper off module and tristate its output This means that the ACLK pin of the FPAAs will not be clocked also the PIC32 microcontroller will not be clocked so the whole board will effectively be disabled This jumper controls the generation of a negative Jumper to the right supply 3 3V for the output buffer stages on the board Jumper to the right disbales the negative supply ties it to ground Jumper to the left enables the supply This jumper connects the LCCb pin of FPAA 1 to Jumper on the left to the CS1b pin of FPAA 2 to the right This effectively chains the 2 FPAAs together To shorten the chain to 1 FPAA remove J9 and also the ACT2 jumper from J1 Table 4 Summary of Development Board Jumpers UM231002 K001b Default Condition Fully connects power ground and all FPAA digital signals to the digital section ACLK 16MHz Test circuit download disabled Not in primary configuration storage mode 16MHz oscillator enabled Negative supp
14. d with a circuit using all of the FPAA s resources then the board will take approximately 250mA if an LCD attached but no circuitry added to the breadboard areas NOTES if a supply of 7V is used to power the board then it is not recommended to let the current exceed 320mA for any length of time If using a 6V supply then the board can take up to 440mA If using a 5V supply then the board can take up to 700mA If a large amount of extra circuitry is to be added to the breadboard areas then Anadigm recommends using a 5V UM231002 K001b Page 4 of 20 Anadigm DualApex Development Board 4 0 Programming the board Programming the board in this case means configuring the FPAAs This can be done from a PC or laptop using a standard type A B USB cable The board uses serial port emulation so that from the computer end the link will appear as a COM port NOTE1 Windows 8 1 needs to have the usbser sys file loaded to recognise the USB connection to the board To program the board configure the FPAAs connect the USB cable between the board and a computer and power up the board Open AnadigmDesigner 2 AD2 on the computer and go to the Settings menu then select Preferences Click on the Port tab In the drop down menu under Select Port there should be a COM port corresponding to the Anadigm board This is actually a virtual COM port because the on board PIC32 microcontroller is emulating a serial port NOTE2 the COM port will have no
15. e FPAAs will now be configured with the test circuit green LED indicates configuration successful This test circuit outputs a sine wave on all 7 FPAA outputs 14 differential outputs The frequency of this sine wave is 1kHz on FPAA 1 and 2kHz on FPAA 2 If only FPAA 1 is enabled in the chain then only FPAA 1 will be configured NOTE if a jumper is placed on both J3 and J4 a different circuit will be loaded into the FPAAs This is a special test circuit used by Anadigm during production The user is advised not to place jumpers on both J3 and J4 5 5 Analog Access Points Each of the FPAAs is surrounded by vias which give access to all of its analog and digital pins 5 6 VMR Included in the access points described above is VMR which is brought out to 2 vias one on each side of the FPAA This allows the user to connect VMR pins between the FPAAs with short wires in the case where only one FPAA in the chain is driving VMR UM231002 K001b Page 6 of 20 Anadigm DualApex Development Board 5 7 Digital Section The digital section of the board contains the PIC32 microcontroller status LEDs 16MHz oscillator module and USB interface This section can be electrically isolated from the analog part of the board by removing all of the jumpers from J1 however if it is required that the FPAAs continue to receive an analog clock ACLK then the jumper marked ACLK must be left on If the user needs to disable the PIC32 microcontroller one way is to
16. e positive supply 3 3V This negative supply is used for the output buffer stages bottom left and bottom right but can also be used by the user for circuits built onto the breadboard The negative supply is enabled by moving the jumper J6 to the left It is disabled by moving J6 to the right in which case the negative supply is grounded 5 14 DIP Switches The user can make his own connections on the board with wires but there are a set of DIP switches that allow for easy connection of certain paths between neighbouring FPAAs and between FPAAs and input output buffers UM231002 K001b Page 7 of 20 Anadigm DualApex Development Board These switches are open by default which means they are all pushed to the left The user can close switches by pushing them to the right A summary of the DIP switches is shown in table 1 Function Type Labels Connect Rauch filters to FPAA i ps 4way S8 9 10 11 Connect between FPAAs 4way S2 3 Connect FPAA o ps to buffers 2way 14 15 19 20 Table 1 DIP Switches NOTE The DIP switches are small and of the flush type so a sharp tool such as a thin screw driver is recommended for opening closing the switches EXAMPLES To connect Rauch filter input to 11 of FPAA 1 close all 4 switches on S10 To connect 04 of FPAAH to 11 of FPAA 2 close upper 2 switches of S2 To connect O1 of FPAA 2 to 14 of FPAAH1 close lower 2 switches of S2 To connect O3 of FPAA 1 to output buffer clo
17. imary sent to the board will be stored in FLASH memory in the PIC32 microcontroller Subsequent resetting of the board will result in these stored configurations being downloaded to the FPAAs automatically These circuits will be stored indefinitely until they are over written with other configurations or are cleared by taking the board out of FLASH storage mode To take the board out of FLASH storage mode remove the jumper from J4 and reset the board The board will no longer be in FLASH storage mode and any stored configurations in the PIC32 will be overwritten with blank configurations NOTE if only one configuration is stored by configuring a single FPAA 1 in FLASH storage mode and the chain of FPAAs is then increased to 2 then on reset of the board FPAA 1 whose configuration was stored will be configured from FLASH with its stored configuration but FPAA 2 will be configured with a blank circuit NOTE2 if 2 configurations are stored by configuring both FPAAs in FLASH storage mode and the chain of FPAAs is then decreased to 1 then on reset of the board FPAA 1 will be configured from FLASH with its stored configuration but the extra configuration will not be downloaded NOTE3 FLASH storage mode should only be used for storing primary configurations 54 Test Circuit The board is capable of self configuring the FPAAs with a test circuit for quick checking of the board To do this place a jumper on J3 and reset the board Both of th
18. ly disabled Both FPAAs chained Page 12 of 20 Anadigm DualApex Development Board 43 download test J4 store configs J5 16MHz osc disable Ji digital uf J2 ACLK select stored circuit in FLASH default off osc anabled default on i f connected default off 16MHZ_ default off notestcct default off not store PinlOOOO000000 00 Cc fol lol 191 jo fo e o Oo lo pIin 0000070000000000 ONO RAUCH 1901 BUF_ 2 04 J7 chain dpASP 1 amp 2 J 3 3V supply default on 1 amp 2 chained default to right disabled Figure 6 Positions of Jumpers UM231002 K001b Page 13 of 20 7 0 Absolute Maximum Ratings Anadigm DualApex Development Board Parameter Symbol Min Typ Max Unit Comment DC Power Supply Viack 4 5 6 V DC voltage only 3 5mm jack socket Centre pole is positive outer sleeve is ground DC Power Supply V 4 5 6 V DC voltage only Screw terminal post Voltage is relative to Gnd post DC power supply At room temperature regulator max current The FPAAs require typically 40mA each max 75mA The additional available 7 volts input Isupply Za MA power may be used by the microcontroller 6 volts input 440 MA and components added to the breadboard The regulator is capable of delivering 1A 5 volts input 700 MA but the current is limited by the regulator power dissipation FPAA Input Voltage Fin 0 5 3 6 V Direct input to FPAA on analog IO
19. ole capacitors For example if a 2 2nF capacitor is added to C1 and 1nF capacitors added to C2a and C2b the corner frequency can be reduced to 230Hz Alternatively if a higher corner frequency is required through hole resistors can be added again without removing the surface mount components beneath For example if 10kO resistors are added to R1a R1b R2a and R2b and 4 7kQ resistors are added to R3a and R3b then the corner frequency can be increased to 1MHz reducing the resistor values increased the corner frequency by the same factor The other 2 Rauch filters are not populated at all so the user is free to design their own using the equations mentioned earlier or the Excel spreadsheet available from Anadigm s website If the user does not wish to use Rauch filters it is recommended to open the DIP switches connecting the Rauch to the FPAA and connect directly to the FPAA pins using wires soldered to the labelled vias that surround each FPAA 5 16 Output Buffers There are 4 output buffers each pair is connected via DIP switches to each of the 2 FPAAs The circuit for each of these buffers is shown in figure 5 Like the input Rauch filters these buffers are multipurpose and perforn the following functions they convert the differential output from the FPAA to single ended they step down the FPAA output from VMR to ground they can amplify or attenuate the signal out of the FPAA and they provide a low pass filter function one pole which
20. re with its 32bit PIC32 microcontroller and 2 FPAA devices it provides an extremely powerful platform on which to develop embedded systems This manual provides an overview on how to effectively use this board to implement your analog design But first here are some salient features of the Anadigm DualApex development board Features with this new development board Board footprint 5 6 x 4 7 inches Versatile supply requirement single supply 4 to 7V On board regulated 3 3V supply On board generated 3 3V supply Standard USB serial interface for downloading AnadigmDesigner 2 circuit files 32bit PIC32 with 80MHz clock 512KB program memory 32KB data memory 16 x 10bit ADCs Simple 5 pin header for reprogramming of PIC32 Option for 16MHz or 40MHz analog master clock 16 x 2 LCD display capable Breadboard areas Access points to all relevant pins of each FPAA Input Rauch LP filters easily configured with passive components Output LP filter buffers easily configured with passive components DIP switches for easy connectivity between FPAAs input Rauch filters and output buffers Ability to electrically isolate digital amp analog sections Ability to configure 1 or 2 FPAA chain Ability to store configurations in FLASH Ability to self configure with test circuit Reset button UM231002 K001b Page 2 of 20 Anadigm DualApex Development Board 2 0 Layout Figures 2 shows the layout of the board allowing easy location of
21. rought out for the user to use These pins can be used as standard I Os RBO 15 or as 10bit ADC channels ANO 15 These I Os and ADC channels are not used by the ABK but are available for the user developing his own embedded software NOTE1 AN15 is also used for the LCD so is not available as an ADC channel or I O if an LCD display is used NOTE2 AN6 7 are shared with the programming header This does not prevent use of these channels but leaving a programmer connected to the board may cause issues when using these channels 5 11 LCD Display A standard 16x2 LCD display can be added to the board This can be fitted onto one of two 16 pin headers one immediately below the digital breadboard area and one immediately above the digital breadboard area The header pins are not fitted as standard so need to be added The header required is a standard 16 pin 2 54mm 0 1 pitch SIL header pin Pin 1 is to the left and is marked 5 12 Breadboard Areas There are 2 breadboard areas where the user can add their own circuitry There is a digital breadboard area at the top left of the board which should be used for digital circuits which may be more noisy This area is provided with ts own power and ground There is also a larger analog breadboard area running along the bottom of the board This is provided with positive supply negative supply and ground 5 13 Negative Supply There is a negative supply 3 3V which is generated on the board from th
22. se both switches of S15 NOTE1 Rauch filters see section 5 14 use 4 of the FPAA pins using both the differential inputs AND the differential outputs NOTE2 these DIP switches provide the ability to make certain connections on the board very easily and quickly but the user can make any connections they want by soldering on wires 5 15 Input Rauch Filters There are 4 input buffer stages called Rauch filters These are multi purpose buffers which do the following they can convert a single ended signal to differential into the FPAA they can step up a ground referenced signal to Voltage Mid Rail VMR 1 5V into the FPAA they can amplify or attenuate an input signal to allow for perfect matching to the FPAA supply and they provide a low pass filter function two pole which is very useful in minimising high frequency noise from being aliased into the FPAA The Rauch filter consists of 9 passive components 6 resistors and 3 capacitors connected to the 4 pins of a type 1 O IOCell1 2 3 4 of the FPAA The 6 resistors are in the form of 3 identical pairs the capacitors are in the form of 1 identical pair and 1 on its own These components work in combination with an amplifier built into the I O of the FPAA This amplifier must be enabled for the Rauch filter to work To enable the amplifier in AD2 double click on the appropriate IO cell IOCell1 4 select the radio button marked Input select the radio button marked Amplifier Filter Click
23. te that configuration failed NOTE3 it is important that the number of FPAAs in AD2 should correspond with the number of FPAAs enabled on the board For example if the board has been set up with a chain of 2 FPAAs then it will be expecting 2 FPAA configurations to be downloaded from AD2 UM231002 K001b Page 5 of 20 Anadigm DualApex Development Board 5 0 Other Features 5 1 Reset Button There is a reset button at the top of the board just to the left of the Anadigm logo This resets both the FPAAs and the PIC32 5 2 Variable Chain Length The board contains 2 FPAAs in a chain This chain can be shortened to 1 but must be shortened by disabling FPAA 2 from the end of the chain from the right hand side To reduce the chain to 1 FPAA remove jumper J7 and also remove the jumper marked ACT2 from J1 This will disable FPAA 2 nearest the power supply NOTE if a chain of 2 FPAAs is configured and then FPAA 2 is disconnected from the chain the disconnected FPAA will still hold its configuration until either the board is reset or the single FPAA is configured again 5 3 FLASH Storage To place the board in FLASH storage mode place a jumper on J4 and then reset the board make sure there is no jumper on J3 After resetting the board the FPAAs will at first be configured with blank circuits and the green LED will light to show successful configuration The board will now be in FLASH storage mode which means that any configurations pr
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