ADAU1361BCPZ-R7 datasheet(50/78 Pages) AD

50 / 78 page

Data Sheet

ADAU1361

CONTROL REGISTERS

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Rev. E | 50 of 78

Table 36. Right Differential Input Volume Control Register

Bits

Bit Name

Description

[7:2]

RDVOL[5:0]

Right channel differential PGA input volume control. The right differential input uses the RINP (positive signal) and RINN (negative signal)

pins. Each step corresponds to a 0.75 dB increase in gain. See Table 71 for a complete list of the volume settings.

Setting

Volume

000000

−12 dB (default)

000001

−11.25 dB

…

010000

0 dB

…

111110

34.5 dB

111111

35.25 dB

RDMUTE

Right differential input mute control.

0 = mute (default).

1 = unmute.

RDEN

Right differential PGA enable. When enabled, the RINP and RINN pins are used as a full differential pair. When disabled, these two pins are

configured as two single-ended inputs with the signals routed around the PGA.

0 = disabled (default).

1 = enabled.

R10: Record Microphone Bias Control, 16,400 (0x4010)

This register controls the MICBIAS pin settings for biasing electret type analog microphones.

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Reserved

MPERF

MBI

Reserved

MBIEN

Table 37. 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 38. 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

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