ADAU1361BCPZ-R7 datasheet(31/81 Pages) AD

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ADAU1361

Rev. C | Page 30 of 80

Analog Microphone Inputs

For microphone inputs, configure the part in either stereo

pseudo-differential mode or stereo full differential mode.

The LINN and LINP pins are the inverting and noninverting

inputs for the left channel, respectively. The RINN and RINP

pins are the inverting and noninverting inputs for the right

channel, respectively.

For a differential microphone input, connect the positive signal

to the noninverting input of the PGA and the negative signal to

the inverting input of the PGA, as shown in Figure 32. The PGA

settings are controlled with Register R8 (left differential input

volume control register, Address 0x400E) and Register R9 (right

differential input volume control register, Address 0x400F). The

PGA must first be enabled by setting the RDEN and LDEN bits.

LEFT

MICROPHONE

LEFT

PGA

LDBOOST[1:0]

MUTE/

0dB/20dB

–12dB TO

+35.25dB

RIGHT

MICROPHONE

RIGHT

PGA

RDBOOST[1:0]

MUTE/

0dB/20dB

–12dB TO

+35.25dB

ADAU1361

LINP

LINN

RINN

MICBIAS

RINP

Ω

Figure 32. Stereo Differential Microphone Configuration

The PGA can also be used for single-ended microphone inputs.

Connect LINP and/or RINP to the CM pin. In this configura-

tion, the signal connects to the inverting input of the PGA,

LINN and/or RINN, as shown in Figure 33.

LEFT

MICROPHONE

LEFT

PGA

LDBOOST[1:0]

MUTE/

0dB/20dB

–12dB TO

+35.25dB

RIGHT

MICROPHONE

RIGHT

PGA

RDBOOST[1:0]

MUTE/

0dB/20dB

–12dB TO

+35.25dB

ADAU1361

LINN

LINP

RINP

MICBIAS

RINN

Ω

Figure 33. Stereo Single-Ended Microphone Configuration

Analog Line Inputs

Line input signals can be accepted by any analog input. It is

possible to route signals on the RINN, RINP, LINN, and LINP

pins around the differential amplifier to their own amplifier and

to use these pins as single-ended line inputs by disabling the

LDEN and RDEN bits (Bit 0 in Register R8, Address 0x400E,

and Bit 0 in Register R9, Address 0x400F). Figure 34 depicts a

stereo single-ended line input using the RINN and LINN pins.

The LAUX and RAUX pins are single-ended line inputs. They

can be used together as a stereo single-ended auxiliary input, as

shown in Figure 34. These inputs can bypass the input gain

control, mixers, and ADCs to directly connect to the output

playback mixers (see auxiliary bypass in Figure 31).

ADAU1361

–12dB TO +6dB

LINNG[2:0]

LINN

LEFT LINE

INPUT

–12dB TO +6dB

RINNG[2:0]

RINN

RIGHT LINE

INPUT

LAUX

LEFT AUX

INPUT

RAUX

RIGHT AUX

INPUT

AUXILIARY

BYPASS

Figure 34. Stereo Single-Ended Line Input with Stereo Auxiliary Bypass

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