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CS8421 ASRC configuration?
CS8421 ASRC configuration?
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Old 23rd January 2017, 05:12 PM   #1
ericj is offline ericj  United States
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Default CS8421 ASRC configuration?

I just have a basic question about configuring the CS8421 ASRC chip.

A while back i bought one of these modules:

CS8421 I2S sample rate conversion module upscaling | eBay

As described by the vendor, it is preconfigured for 24/211 output. Trick is, I want to use it with a CS4397 which I'm pretty sure maxes out at 192k.

Having a bit of a brain cramp reading the datasheet. Do i need a different clock to select 192khz?
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Old 25th January 2017, 05:03 PM   #2
ericj is offline ericj  United States
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Though, with careful reading of the datasheet, it looks like the 4397 doesn't accept i2s at 192khz anyway. It accepts right-justified at 192khz.

Last edited by ericj; 25th January 2017 at 05:06 PM.
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Old 19th June 2018, 07:46 AM   #3
yogilla62 is offline yogilla62
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Did you solve your problem?
I also bought this module but for CS4399, which is 32bit.
PCB with CS8421 is pre-configured for 24-bit output.
According to dataschet and placed tables, SAOF pin change is enough
with 4.02 k 1% to GND IS 24-bit date
at 8.06 k 1% to GND IS 32-bit date
Has anyone tried such changes?
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Old 20th June 2018, 03:26 PM   #4
Markw4 is online now Markw4  United States
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There is a datasheet for CS8421 at Mouser: http://www.mouser.com/ds/2/76/CS8421_F7-765043.pdf
It should tell you everything you need to know, or at least be a good start. Beyond that it would probably be a matter of understanding the I2S/PCM/TDM formats and interfacing to whatever to want to interface to.

Otherwise, if all that has been done and there are remaining questions or issues then maybe we could try to assist.

Last edited by Markw4; 20th June 2018 at 03:28 PM.
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