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PCM1753, PCM1754, PCM1755

SLES092E – APRIL 2003 – REVISED JULY 2019

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Product Folder Links: PCM1753 PCM1754 PCM1755

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Copyright © 2003–2019, Texas Instruments Incorporated

8.6.1.2 Register Definitions

8.6.1.2.1

ATx[7:0]: Digital Attenuation Level Setting

Where x = 1 or 2, corresponding to the DAC output VOUTL (x = 1) and VOUTR (x = 2).

Default value: 1111 1111b

Each DAC channel (VOUTL and VOUTR) includes a digital attenuation function. The attenuation level can be set

from 0 dB to –63 dB in 0.5-dB steps. Changes in attenuator levels are made by incrementing or decrementing

one step (0.5 dB) for every 8/fS time internal until the programmed attenuator setting is reached. Alternatively,

the attenuation level can be set to infinite attenuation (or mute).

The attenuation data for each channel can be set individually. The attenuation level is set using the following

formula:

Attenuation level (dB) = 0.5 × (ATx[7:0]DEC – 255)

where ATx[7:0]DEC = 0 through 255.

For ATx[7:0]DEC = 0 through 128, attenuation is set to infinite attenuation.

The table in Figure 28 shows the attenuation levels for various settings:

Figure 28. ATx[7:0]: Digital Attenuation Level Setting Table