Datasheet

ADAU1381

Rev. B | Page 50 of 84

The record gain left PGA control register controls the left channel

input PGA. This register configures the input for either differ-

ential or single-ended signals and sets the left channel input

recording volume.

Bits[7:5], Left Input Gain

These bits set the left channel analog microphone input PGA gain.

Bit 2, Single-Ended Left Input Enable

If this bit is high (enabled), a single-ended input can be input on

the LMIC pin and gained by the PGA. The positive differential

input pin (LMICP) is disabled, and the complementary input of

the PGA is switched to common mode.

Bit 1, Record Path Left Mute

This bit mutes the left channel input PGA.

Bit 0, Left PGA Enable

This bit enables the left channel input PGA

Table 37. Record Gain Left PGA Register

Bits Description Default

[7:5] Left input gain 000

000: 0 dB

001: 6 dB

010: 10 dB

011: 14 dB

100: 17 dB

101: 20 dB

110: 26 dB

111: 32 dB

[4:3] Reserved

2 Single-ended left input enable 0

0: disabled

1: enabled

1 Record path left mute 0

0: muted

1: unmuted

0 Left PGA enable 0

0: disabled

1: enabled