PCM4201: PCM4201 Mode and System Clock

Yangyang Guan

Prodigy 10 points

Part Number: PCM4201

PM4201

What's the difference between master mode and slave mode of PCM4201; what applications are they used for, in my case, I want to realize sound source localization via microphone arrays, and I will use FPGA as controller.(By the way, is it possible to interface this ADC with FPGA?)
The system clock is used to provide sampling frequency reference and it goes to audio DSP and ADC. But in master mode, the PCM4201 generates the FSYNC and BCK clocks to communication, then I would liek to ask what's the usage of this system clock for audio DSP?

over 2 years ago

0 Sanjay Dixit over 2 years ago

TI__Mastermind 21880 points

shall respond tomorrow

0 Sanjay Dixit over 2 years ago in reply to Sanjay Dixit

TI__Mastermind 21880 points

In Mater mode the device Generates the BCLK and LRCK . The Bit clock indicates presense of a new Data bit on the Digital output. These timings are made synchronous to a Master Clock that must be fed to the PCM 4201 DEVICE. This has to be a multiple of the Sampling rate.

If we like the device to make 44.1Khz sampling rate we need a SCLKI of 512*Fs=22.5Mhz. This timing can be generated in a DSP/FPGA.

This SCKI s synchronous to the BCLK waveform generated and can be used as a reference to latch data if BCLK has jitter .

You can connect in master mode to an FPGA. Implement a serial to Parallel Data conversion in FPFA using SCKI and BCK as a Clock.

0 Yangyang Guan over 2 years ago in reply to Sanjay Dixit

Prodigy 10 points

1.Dear Sanjay, if I understand correctly, you mean in master mode, SCKI can be provided by FPGA, right? But I wonder whether SCKI clock generated by FPGA will have jitter more easily?

2.In master mode, can we use external oscillator (22.5MHz) as for, without connect oscillator to FPGA?

0 Sanjay Dixit over 2 years ago in reply to Yangyang Guan

TI__Mastermind 21880 points

Yes you can use an oscillator to provide a clock to the PCM device

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PCM4201: PCM4201 Mode and System Clock