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Old 14th January 2003, 06:28 PM   #1
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Question AD1954 (SigmaDSP)

Hi all,
I am planning to build myself a 2.1 amplifier with digital and analog inputs, and with the Analog Devices SigmaDSP doing volume control and implementing a 7-band equalizer. Thought of using the AD1892 as an S/PDIF receiver, and a PCM1801 as an ADC (for the analog input). Has anyone done any work on the sigmaDSP? I have the devices with me (samples which ADI very kindly sent me), but they say the software for it is available only to people who buy the eval board, and I dont have that much money. I found bimbla's question on this DSP unanswered, so I thought I'd try again. Any inputs will be very helpful. I've never worked with digital audio before, and never done SMT soldering, either Thanks.
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Old 14th January 2003, 06:36 PM   #2
tiroth is offline tiroth  United States
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Suggest you pick an easier project than ADC+DIR+DSP+DAC to start! That sounds very complex. It is hard enough getting DIR+DAC to work without adding the complexity of a DSP that you don't have known working code for,
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Old 15th January 2003, 02:57 PM   #3
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Hi tiroth,
Well, the idea seems feasable because the number of chips will be low, just three (ADC, DIR, DSP), since the DSP includes three DACs. Also, the DSP comes pre-programmed with code that implements the features i mentioned (EQ, etc.). All that's needed is a microcontroller to send it volume, EQ controls, etc. That I'm familiar with, I've made several uC based projects before (only two dealt with audio).
Anyone who can give me a couple of pointers on things like layout criteria for the DACs etc.? It's usually the layout that screws up anything which mixes audio and digital.
I found one post (forgot where ) which had a picture of SMTs (TQFPs, SOICs and (gasp!) TSSOPs) wired together with very thin wire, all stuck onto a Kapton tape. Will such a technique provide acceptable audio performance? I can only see problems with power supply bypassing for the digital parts.
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Old 7th August 2003, 12:17 PM   #4
Achimek is offline Achimek  Germany
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Default ad1954 is a fine chip

i use two ad1954 chips to build a 3 way active xover. it is combined with a cs8420 as digital transceiver and a ad1871 as ad-converter. the whole system is booted with a microcontroller and i generated an labbiew interface for generating iir filter coefficients.

soon my project will be on my website.
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Old 14th April 2004, 11:00 PM   #5
Demir is offline Demir  Canada
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How do you create the labview interface ? To my knowledge, ADI doesn't offer the source code.
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Old 15th April 2004, 05:24 PM   #6
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You dont need that interface software, it is used only with the 1954 eval board. I plan to use an MCU to control the DSPs and S/PDIF receivers. The SPI interface to the DSP is well documented, I guess it will be easy to do. I finished making the board, I have yet to test it for lack of test equipment
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Old 15th April 2004, 06:20 PM   #7
jwb is offline jwb  United States
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Holy cow, a DSP xover is exactly the project I have always wanted, but it's over my head. I look forward to seeing your plans!

Is it also capable of FIR filter?

Edit: Oh I see, the AD1954 has it's own on-board DAC. I'm much more interested in a DSP crossover with digital outputs.
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Old 15th April 2004, 07:17 PM   #8
Demir is offline Demir  Canada
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JWB: You can set it up for digital outputs

Roadkill: I am referring to Archimek's comments re the GUI
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Old 16th April 2004, 09:12 AM   #9
alfsch is offline alfsch  Germany
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Hi,
is there any (free) software for ad1954?
mfg
alf
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Old 16th April 2004, 05:16 PM   #10
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To design FIR filter coefficients, you can use the formulae given at the end of the datasheet. You can enter these into matlab to plot their freq response.
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