ADAU1961WBCPZ-R7 datasheet(50/73 Pages) AD

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Data Sheet

ADAU1961

CONTROL REGISTERS

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Rev. B | 50 of 73

Table 35. Record Microphone Bias Control Register

Bits

Bit Name

Description

MPERF

Microphone bias is enabled for high performance or normal operation. High performance operation sources more current to the microphone.

0 = normal operation (default).

1 = high performance.

MBI

Microphone voltage bias as a fraction of AVDD.

0 = 0.90 × AVDD (default).

1 = 0.65 × AVDD.

MBIEN

Enables the MICBIAS output.

0 = disabled (default).

1 = enabled.

R11: ALC Control 0, 16,401 (0x4011)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

PGASLEW[1:0]

ALCMAX[2:0]

ALCSEL[2:0]

Table 36. ALC Control 0 Register

Bits

Bit Name

Description

[7:6]

PGASLEW[1:0]

PGA volume slew time when the ALC is off. The slew time is the period of time that a volume increase or decrease takes to ramp up or

ramp down to the target volume set in Register R8 (left differential input volume control) and Register R9 (right differential input volume

control).

Setting

Slew Time

24 ms (default)

48 ms

96 ms

Off

[5:3]

ALCMAX[2:0]

The maximum ALC gain sets a limit to the amount of gain that the ALC can provide to the input signal. This protects small signals from

excessive amplification.

Setting

Maximum ALC Gain

000

−12 dB (default)

001

−6 dB

010

0 dB

011

6 dB

100

12 dB

101

18 dB

110

24 dB

111

30 dB

[2:0]

ALCSEL[2:0]

ALC select. These bits set the channels that are controlled by the ALC. When set to right only, the ALC responds only to the right channel

input and controls the gain of the right PGA amplifier only. When set to left only, the ALC responds only to the left channel input and controls

the gain of the left PGA amplifier only. When set to stereo, the ALC responds to the greater of the left or right channel and controls the gain

of both the left and right PGA amplifiers. These bits must be off if manual control of the volume is desired.

Setting

Channels

000

Off (default)

001

Right only

010

Left only

011

Stereo

100

Reserved

101

Reserved

110

Reserved

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