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PCM6240-Q1: Using this in standard 2 channel (left & right) in I2S mode

Prabhakar A
Intellectual 260 points
Part Number: PCM6240-Q1
Other Parts Discussed in Thread: PCM1865

Hi Team,

We are trying to use PCM6240-Q1 in our new design in place of PCM1865. The data sheet says that on I2S bus, we can have 64 slots (channels). Here we got confusion, whether we can use this device for just 2 slots (left & right channels) in standard I2S mode. We mainly need PGA, HPF and AGC functions of this device for our application.

We just needed 2 channels (left and right) with following configuration:

Sampling clock (FSYNC) = 48KHz
Bit clock (BCLK) = 64*48KHz = 3.072MHz

Data width per channel (slot) is 32bits.

Can use PCM6240-Q1 device for just 2 slots (left & right channels) in standard I2S mode?. 

Best regards, Prabhakar

  • 0
    Intellectual 260 points


    Looks like no response. So we will use TDM mode in our design instead of I2S with Host processor. 


    I have another question for PCM6240, Where to connect VBAT_IN pin?.

    As per datasheet, it should be connected to vehicle battery. We are using for portable device which has only 3.3V supply only.


    Best regards, Prabhakar

  • +1 in reply to Prabhakar A
    TI__Mastermind 23050 points

    Hi Prabhakar,

    I apologize for the delay, I was out of office the past few days. The PCM6240 can support a maximum of 64 slots, but it can support all the way down to a single slot as well (although for I2S at least 2 slots are required). There are no issues using I2S as long as you provide the appropriate BCLK/FSYNC ratio for the number of slots and resolution you want. The settings you provided above are perfectly acceptable. 

    We also have a 2 channel version of the device that you might prefer though, it is the PCM6020. It is identical performance and package but the unused channel pins are NC.

    The VBAT_IN pin is intended for battery monitoring, but it can be connected to any voltage you want to monitor as long as it is within the 0 - 18V range given in the datasheet. This pin is just monitored by an internal SAR ADC and it has ~1MOhm input impedance.

    Best,

    Zak

  • 0 in reply to Zak Kaye
    Intellectual 260 points

    Thanks very much Zak.

    We will continue with PCM6240

    Also, we will connect VBAT_IN to 3.3V supply.