TAS3208 DSP test board - diyAudio
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Old 4th August 2009, 10:33 AM   #1
berni8k is offline berni8k  Slovenia
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Default TAS3208 DSP test board

I have the TAS3208 audio DSP chips and the software to program them. So now im making a test board to play around with them.

So now there is a choise of ADCs , DACs, SPDIF etc

For the ADC i was thinking the PCM1808 ADC and for the DAC an PCM1798. As for SPDIF i am looking at the DIR9001

Anybody have any good/bad experience with the chips or any tips on things to watch out for.

As for controlling the DSP and loading it with the program im thinking of a PIC16F88 or similar

Il draw a schematic of the thing when i know what i want to use
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Old 4th August 2009, 09:06 PM   #2
berni8k is offline berni8k  Slovenia
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I have finished the schematic drawing for the board.

The analog ports of the chip are routed to pin headers for various connection.

As for the digital audio pins they are routed on to "sockets" of headers to accommodate tiny boards congaing a DAC or ADC. There is also a socket for a EEPROM that stores the DSP program.

The board can actually be used as a crossover or something as it can work standalone from a single 3.3V supply

So do you guys see anything done wrong or in need of improvement ?
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Old 5th August 2009, 08:35 AM   #3
Shaun is offline Shaun  South Africa
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berni8k

I like!

What comms interface do you propose to use with this board?
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Old 5th August 2009, 02:10 PM   #4
berni8k is offline berni8k  Slovenia
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Well the control connector basically gives access to the I2C port on the DSP and to the I2C EEPROM for loading a new program. I plan to connect that to a simple PIC16F and connect that to PC with RS232 so i can pass I2C commands and program the EEPROM from there. The DSP can run without anything on that connector as the DSP reads from the EEPROM by it self after power on. But you cant change any settings during runtime.

In all I2C commands are very simple.Each setting for a function block can be assigned a I2C address so simply send a I2C write command to that address.(For example the volume slider of an attenuation block or slider of a EQ etc)

In the final application it will be connected to a dsPIC30F and have the ADCs and DACs on the same board rather than on sockets.It will also get digital pots for volume control.
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Old 5th August 2009, 02:56 PM   #5
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Analog inputs / outputs are not used?
Then how about TAS3108, 38 pin TSSOP package?
(SDIN1-4, SDout1-4 only)
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Old 5th August 2009, 04:21 PM   #6
berni8k is offline berni8k  Slovenia
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All available analog I/O is used. 2ch ADC and 6ch DAC .The TAS3208 dose NOT have 10 analog inputs as it apears from the pins.It has only 1 stereo ADC with a 10:1 MUX ! (I would love it if those ware independent ADCs)
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Old 5th August 2009, 11:49 PM   #7
berni8k is offline berni8k  Slovenia
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This is my first try at making in in to a PCB.
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Old 6th August 2009, 12:00 AM   #8
berni8k is offline berni8k  Slovenia
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Also a PDF version of the coper
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Old 21st August 2009, 12:53 PM   #9
berni8k is offline berni8k  Slovenia
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Update after a long time i have finally etched the board for it and in solder it together soon. And finaly play some with this DSP
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Old 24th August 2010, 02:45 PM   #10
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Hi,
Are you still working with the 3208? I'm thinking of trying the "low cost" evaluation board from TI with USB port and stereo analog in/out.

I'm wondering if this part is powerful enough to do phase adjustments + "digital room correction".
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