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PCM6360-Q1: PCM6360 TDM supports 73.728MHz ?

Part Number: PCM6360-Q1
Other Parts Discussed in Thread: PCM6260-Q1, PCM6240-Q1

Hi, Expert

My customer is asking how does PCM6260 TDM support 73.728 Mhz 

384kHz×32bits×6ch=73.728MHz

Out put to external Audio chip via SDOUT TDM.

Your advice is appreciate

 

  • Hello Takeshi-san,

    First, the maximum BCLK frequency of the PCM6xx0-Q1 family is 25MHz (40ns min period - Section 7.10 in datasheet).

    Second, there are limited processing resources available in the PCM6xx0-Q1 family to perform the required decimation and filtering at higher speeds and as a result the maximum channel count while operating at 384kHz is 2.  Please find more information about the supported combinations in the following application note:

  • Thank you vey much for the clear explanation. Appreciate

  • Hi Collins,

    If 384kHz limit the maximum number of channel to be processed to 2 channels,

    Even if I limit the resolution to 16bit (384kHz x 16bit x 4 = 24.5MHz), the maximum output channel is still limited to 2 channels?

    regards,

  • Hello,

    The maximum channel count is related to internal processing requirements from the fixed resource processing engine performing the decimation, filtering, DRE/AGC, etc.  Therefore, the data length and resulting max BCLK frequency is not the limiting factor.

    We've been communicating offline directly and we've shown that it's actually possible (barely) to get 3 active channels using the PCM6260-Q1 or PCM6240-Q1 at 384kHz sampling rates provided soft-stepping and most other processing features are turned off while using the three channels.

  • Hi Collin,

    Thank you for the clarification.

    regards,