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In the “Process Flow” section of the TAS5766M data sheet, (SLAS965D – Revised October 2018), section 7.4.7.5 (page 32) lists a “Stereo Volume Control” block. It states below Figure 43 that the Volume Block is adjustable from -110dB to +6dB with 0.5dB steps, including a fixed gain block of 0dB to 12dB gain.
I could not find any register settings for this volume control that can be set in 0.5dB increments.
In the register list, these are the only ones that seem to control the gain / volume:
Are there some registers descriptions missing in the data sheet?
Is the data sheet incorrect and the gain can only be changed from 0dB to -6dB?
Hi David,
Take a look the Linux driver for TAS5766M below and you will see some C code that shows how to adjust the volume.
[FAQ] Linux: Linux Drivers - Audio forum - Audio - TI E2E support forums
Andy
This looks like it writes to PAGE 0x2C to change the volume. This page does not seem to be documented in the data sheet.
If the volume control registers aren't documented, is this something that could be removed in a future silicon revision?
Will the volume control registers ever change or are they locked into the product?
Thanks,
Dave Smith
Hi Dave,
These volume control registers are already fixed.
Actually, TAS5766M is already a bit old device. We will not make any change to it.
Andy