PCMD3140IRTER datasheet(28/106 Pages) TI

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7.3.6.1 Programmable Digital Volume Control

The device has a programmable digital volume control with a range from –100 dB to 27 dB in steps of 0.5 dB

with the option to mute the channel recording. The digital volume control value can be changed dynamically

when the channel is powered-up and recording. During volume control changes, the soft ramp-up or ramp-down

volume feature is used internally to avoid any audible artifacts. Soft-stepping can be entirely disabled using the

DISABLE_SOFT_STEP (P0_R108_D4) register bit.

The digital volume control setting is independently available for each output channel, including the digital

microphone record channel. However, the device also supports an option to gang-up the volume control setting

for all channels together using the channel 1 digital volume control setting, regardless if channel 1 is powered up

or powered down. This gang-up can be enabled using the DVOL_GANG (P0_R108_D7) register bit.

Table 7-10 shows the programmable options available for the digital volume control.

Table 7-10. Digital Volume Control (DVC) Programmable Settings

P0_R62_D[7:0] : CH1_DVOL[7:0]

DVC SETTING FOR OUTPUT CHANNEL 1

0000 0000 = 0d

Output channel 1 DVC is set to mute

0000 0001 = 1d

Output channel 1 DVC is set to –100 dB

0000 0010 = 2d

Output channel 1 DVC is set to –99.5 dB

0000 0011 = 3d

Output channel 1 DVC is set to –99 dB

…

1100 1000 = 200d

Output channel 1 DVC is set to –0.5 dB

1100 1001 = 201d (default)

Output channel 1 DVC is set to 0 dB

1100 1010 = 202d

Output channel 1 DVC is set to 0.5 dB

…

1111 1101 = 253d

Output channel 1 DVC is set to 26 dB

1111 1110 = 254d

Output channel 1 DVC is set to 26.5 dB

1111 1111 = 255d

Output channel 1 DVC is set to 27 dB

Similarly, the digital volume control setting for output channel 2 to channel 4 can be configured using the

CH2_DVOL (P0_R67) to CH4_DVOL (P0_R77) register bits, respectively.

The internal digital processing engine soft ramps up the volume from a muted level to the programmed volume

level when the channel is powered up, and the internal digital processing engine soft ramps down the volume

from a programmed volume to mute when the channel is powered down. This soft-stepping of volume is done to

prevent abruptly powering up and powering down the record channel. This feature can also be entirely disabled

using the DISABLE_SOFT_STEP (P0_R108_D4) register bit.

PCMD3140

SBASA64A – DECEMBER 2020 – REVISED JUNE 2021

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