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TLV320ADC5140: full-scale input to ADC5140 evm

JIN HYUNG LEE
Prodigy 50 points
Part Number: TLV320ADC5140

Hello,

I have a question about full-scale input of ADC5140evm.

I think it is not working with 2Vrms full-scale input. ( refer to pictures below)

 How can I make it to work with 2Vrms differential full-scale?

Regards,

  • 0
    TI__Expert 6995 points

    Jin,

    The images did not made it through. Please repost them.

    best regards,

     Pedro

  • 0 in reply to PedroGelabert
    Prodigy 50 points

    Hello Pedro,

    It doesn't work to upload the images due to security problem.

    Could you let me know your e-mail address?

    regards,

    Jin

  • 0 in reply to JIN HYUNG LEE
    TI__Expert 6995 points

    JIn,

    If you have security issues posting here, you will have the same issues e-mailing. You can send them through a private message.

    Also could you send how you are configuring the device and the input connections to the device. If you are using PurePath Console, you can upload the configurations parameters used in the EVM. By the way, Pure Path Console has presets for configuring the on-board mic that you can use as a reference.

    Best regards,
    Pedro

  • 0 in reply to PedroGelabert
    Prodigy 50 points

    I have to use the e-mail system of my company to upload image information. So, I asked your e-mail address.

    Anyway, I'll explain it by text below.

    Device configuration

      First, the device's overwritten with PPC3 GUI values(default).

      Audio config is changed

       - IN1P/IN1M

          Input Type : Line input

          Impedance : 10kohm

      Audio Serial Bus

       - ASI Output Configuration

          Channel1 : enable

       - ASI Format Configuration

           Protocol Format : TDM

           Word Length : 32 bits

           Master/Slave : Slave mode

           Bus keeper : Always Disabled

    EVM conditions

       - EVM is powered by USB of the laptop

       - IOVDD : 3.3V,  AVDD : 3.3V

       - Input connection :

           IN1P/IN1M, Header J5/J6 : open, Input source : Differential from AP525(Analog output/Balanced)

       - Output connection

           External mode(S1/S2 off), connected to AP525 by DSIO(receiver)

    Even if BIAS_CFG register value is 0x00(default), It works -0.08dBfs when input source is 1.818Vrms.

    The voltage is measured,

       VREF : 2.73V, AVDD: 3.33V (measured by multimeter)

    What is problem?  How can I make it to work with 2Vrms differential full-scale?

    Best regards,

  • 0 in reply to JIN HYUNG LEE
    TI__Expert 6995 points

    JIn,

    The configuration looks fine. Could you please send me the lot codes that are on the devices.

    Best regards,

      Pedro

  • 0 in reply to PedroGelabert
    TI__Mastermind 23050 points

    Hi Jin,

    I believe your configuration is perfectly fine and this is a result of the gain trimming of the device. Typically, audio devices are not trimmed for dc precision, and in the first versions of the device we released, the gain error could be as high as 1dB. This means the full scale range supported from device to device may be slightly different.

    In the latest builds, we have improved this gain error trimming and would expect closer to 0.5dB or better gain error matching between devices (note this is not a spec that we provide in the datasheet. We do spec channel to channel matching, and that should be much tighter at ~0.1dB).

    If you can provide the lot code information Pedro requested we can determine which batch of parts you have and if the error in full scale range is as expected.

    Best,

    Zak

  • 0 in reply to Zak Kaye
    Prodigy 50 points

    I'm sorry for reply late.

    I understand what you said. I'll test 0dBfs input with 1% THD+N.

    The lot code is

      ADC5140

      TI 9A8

      A2ZS

    Regards,