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PCM1860-Q1: GAIN switching during IC operation

user6517935
Prodigy 70 points
Part Number: PCM1860-Q1

Hello team.

Please tell me about GAIN switching during IC operation of PCM1860-Q1.

In order to switch the gain of CH4, we plan to switch the logic of MD6 pin, MD5 pin, and MD2 pin during IC operation.　

Does this use cause IC malfunction?

Best regards,

Makoto

  • 0
    TI__Guru 62825 points

    Hello,

    The PCM1860-Q1 gain control pins can be adjusted on-the-fly for real time gain adjustments between the 0dB, 12dB, and 32dB gains.  There may be some slight audible artifacts during the exact time of the gain adjustments but this is the only negative effect.

  • 0 in reply to Collin Wells
    Prodigy 70 points

    Hello Collin,

    Let me ask you an additional question.

    It is necessary to control three control lines (MD6, MD5, MD2) at the same time to switch the gain.

    There is a small time lag in this.

    How many seconds should the time lag be within?

    Best regards,

    Makoto

  • 0 in reply to user6517935
    TI__Guru 62825 points

    Hi Makoto,

    The time difference between processing commands for a modern MCU to adjust the outputs of the three GPIOs will not be sufficient enough to cause challenges.  If there are long (ms) differences between the commands then the device may adjust into some of the intermittent modes that the current MD pin settings dictate it will be in.  

    Recommend to write the gain-adjust function in a way where the three GPIO port update commands are sequential to each other and there should not be issues.