ADAU1761 single-ended input gain amplifiers step dB resolution

SigmaDSP & SigmaStudio manguztap Jan 3, 2023 00:00 2 replies Original on forum ↗

manguztap Question

Jan 3, 2023 00:00

Hi there.

In our design we are using ADAU1761 with BF700 processor.

We need to Increase/decrease ADAU1761 Input amplifiers gain (MX1AUXG[2:0] & LINPG[2:0]) with 1dB step resolution (-15dB > +6 dB).

We know currently is mandatory set to 3dB, we've successfully written to these amplifier registers, just want to know if there is a way to change step either in SigmaStudio or using BF700 processor.

Our goal mainly is to attenuate/amplify LAUX-LINP signals before they are mixed with >=11 steps resolution.

Thanks for your help.

Audio Signal Processors

software

4.7

MX1AUXG

SigmaDSP Audio Processors

adau1761

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DaveThib Reply

Jan 17, 2023 00:00

Hello manguztap,

Unfortunately, the design of this input amplifier only has a few gain settings. It is meant to be a rough gain setting with fine settings to be done later in the signal path. This is locked in silicon and is not in software so it cannot be changed.

Dave T

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manguztap Reply

Jan 18, 2023 00:00

Understood Dave thanks for sharing this info.

An external digital pot is gonna do the work.

Thanks again.

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