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Old 29th January 2003, 04:24 AM   #1
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Default Input Stage for Digital Amplifier

Hi

I am currently building the input stage for a Class-D sigma-delta modulator amp in an FPGA (If this rings a bell, I am Gretzteam's partner in this crazy adventure!). Anyways, the CS8414 Digital Audio Receiver from Cirrus Logic seems seems like a logical choice. I have read a lot on the AES-S/PDIF protocol and decide it would be wiser to use this chip instead of implementing it on the FPGA. Anyone has experience with that chip?

From what I have seen in the datasheet(http://www.cirrus.com/en/pubs/proDatasheet/8413-4.pdf), I should select Mode 0, which outputs the clocks (FSYNC and SCK) and 16 bit interleaved left-right audio data. Is this right? I also plan on hardwiring the SEL pin to ground to get the error and frequency reporting option (although I do not plan to really use it as our input will only be from a cd player).

I want the simplest implementation possible. In other words: Should I (Can I?) leave the User Bit pin and all Channel Status pins (Output, block start, channel select) floating and not bother with them. I know about the SCMS stuff but do I need to deal with it?

Once done, I need a serial to parrallel converter (FPGA implemented) From what I see, there is no start/stop bit. Is FSYNC good enough to guide me through left/right channel switching. What about reseting? How long (clock cycles) should I reset the chip on a power-up?

Any ideas and/or comments would be greatly appreciated!

Thanks
SpeedWheel
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Old 31st January 2003, 08:48 AM   #2
Rookie is offline Rookie  Serbia
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DIR1701 and DIR1703 would also be good choices. They have less jitter than Crystal's recievers. If you want compatibility with 192 kHz sampling rate you should use CS8416.
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Old 7th March 2003, 08:52 PM   #3
jwb is offline jwb  United States
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The Crystal 8427 actually has much better jitter attenuation than the DIR170x parts.

For your digital amplifier project, are you also including some analog inputs?
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