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PCM5142: PCM5242

Fai Chan
Intellectual 440 points
Part Number: PCM5142
Other Parts Discussed in Thread: PCM5242, , PCM5122

Hello TI , 

I am looking for a DAC with EQ functions, so I found PCM5122, PCM5142, PCM5242 . However I am confused about Biquad setting in different sample rate. 

About PCM5122 :

1) Does PCM5122 only support the EQ / DRC functions in 48K mode? How many EQ bands in 48K mode?

2) Do the EQ bands also support in higher sampling rate like 96K & 192K ?

About PCM5142 / PCM5242 : 

1) according to the document (SLAU577A) , Does PCM5142 & PCM5242 have 12 EQ in 48K mode ? 5 EQ in 96K mode ? 1 EQ in 192K mode ? 

2) Are those EQ are fixed to certain frequencies only ? Can we adjust EQ on any frequency we want flexibly instead of fixed one ? 

Thank you

Fai Chan

  • 0
    TI__Guru 53633 points
    Hi Fai Chan,

    PCM5122:
    1. This device only supported a single process flow that has biquads. Figure 55 shows this flow. It features a ROM block with 6 configurable biquads followed by three pairs of 2 biquads each that can be used to separate the bands in the DRC.
    2. This process flow is only supported in 48kHz or 44.1kHz sample rates.
    PCM5x42:
    1. These devices have a full feature DSP, though at higher sample rates you are limited to the number of instructions you have available to implement the Biquads. The hybrid flows described in the SLAU577A documents show flows that can be implemented with the limited number of instructions. You can experiment to see how many Biquads you can implement on the PCM5142 in PurePath Studio. It is possible you could implement more than the number in the hybrid flows by eliminating the other components in the flow. Though note we only officially support the Hybrid Flows on the PCM5242.
    2. You are not limited to preset frequencies. You can adjust the cutoff and filter type on each biquad.

    Thanks!
    Paul
  • 0 in reply to Paul_Frost
    Intellectual 440 points
    Hi Paul, I will look into it. Thank you Fai