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LM1972: 60dB analog gain control

Hideki Hayashi1
Expert 6530 points
Part Number: LM1972

Hi team,

I'm looking for a solution that enables analog gain control with 60dB attenuation.

I see an application note below, like it but need more attenuation. DC voltage is preferred as control way than serial interface (ex:I2C) since a potentiometer is used with knob. 

https://www.ti.com/lit/ug/tidu034/tidu034.pdf

Can you suggest recommended solution?

Best regards,

Hayashi

  • 0
    TI__Guru* 98235 points

    Hi Hayashi-san,

    Have you considered to adjust R8 and R9 from the same reference design to change the gain of the circuit? You may recreate the same simulation on TINA or PSpice .
    The integrated volume control devices have all digital control.

    Best regards,
    -Ivan Salazar
    Applications Engineer