ADAU1361BCPZ-R7 datasheet(29/80 Pages) AD

29 / 80 page

Data Sheet

ADAU1361

Rev. D | Page 29 of 80

RECORD SIGNAL PATH

LINP

LINN

LAUX

LEFT

ADC

RIGHT

ADC

JACKDET/MICIN

RAUX

MICIN LEFT

MICIN RIGHT

INSEL

ALCSEL[2:0]

ALC

CONTROL

AUXILIARY

BYPASS

MX1AUXG[2:0]

LDVOL[5:0]

LINNG[2:0]

LINPG[2:0]

LDBOOST[1:0]

MIXER 1

(LEFT RECORD

MIXER)

MIXER 1

OUTPUT

(TO PLAYBACK

MIXER)

MIXER 2

OUTPUT

(TO PLAYBACK

MIXER)

–12dB TO +6dB

MUTE/0dB/20dB

PGA

DECIMATOR/

ALC/

DIGITAL

VOLUME

DIGITAL

MICROPHONE

INTERFACE

MIXER 2

(RIGHT RECORD

MIXER)

–12dB TO +6dB

MX2AUXG[2:0]

–12dB TO +6dB

–12dB TO

+35.25dB

RINN

RINP

ALCSEL[2:0]

ALC

CONTROL

RDVOL[5:0]

RINPG[2:0]

RINNG[2:0]

RDBOOST[1:0]

–12dB TO +6dB

MUTE/0dB/20dB

PGA

–12dB TO

+35.25dB

Figure 31. Record Signal Path

INPUT SIGNAL PATHS

The ADAU1361 can accept both line level and microphone

inputs. The analog inputs can be configured in a single-ended

or differential configuration. There is also an input for a digital

microphone. The analog inputs are biased at AVDD/2. Unused

input pins should be connected to CM.

Each of the six analog inputs has individual gain controls (boost

or cut). The input signals are mixed and routed to an ADC. The

mixed input signals can also bypass the ADCs and be routed

directly to the playback mixers. Left channel inputs are mixed

before the left ADC; however, it is possible to route the mixed

analog signal around the ADC and output it into a left or right

output channel. The same capabilities apply to the right channel

and the right ADC.

Signals are inverted through the PGAs and the mixers. The

result of this inversion is that differential signals input through

the PGA are output from the ADCs at the same polarity as they

are input. Single-ended inputs that pass through the mixer but

not through the PGA are inverted. The ADCs are noninverting.

The input impedance of the analog inputs varies with the gain

of the PGA. This impedance ranges from 1.7 kΩ at the 35.25 dB

gain setting to 80.4 kΩ at the −12 dB setting. This range is shown

in Figure 22.

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