adau1361 Analog Devices, Inc., adau1361 Datasheet - Page 27

• Manufacturer Part Number: adau1361
• Description: Stereo, Low Power, 96 Khz, 24-bit Audio Codec With Integrated Pll
• Manufacturer: Analog Devices, Inc.

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.
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.
JACKDET/MICIN
RAUX
LAUX
RINP
RINN
LINN
LINP
RDVOL[5:0]
LDV
OL
PGA
PGA
[5:0]
ALC
CONTROL
ALC
CONTROL
–12dB TO
+35.25dB
–12dB TO
+35.25dB
ALCSEL[2:0]
ALCSEL[2:0]
RDBOOST[1:0]
LD
RI
RI
L
LI
M
M
BOO
INNG
NP
X1A
X2A
NP
NNG[2:0]
–12dB TO +6dB
–12d
G[2:0]
G[2:0]
MUTE/0dB/20dB
MUTE/0dB/20dB
–12dB TO +6dB
–12dB TO +6dB
–12dB TO +6dB
–12dB TO +6dB
ST[1:0]
UXG[2:0]
UXG[2:0]
[2:0]
B TO +6dB
Figure 30. Record Signal Path
Rev. 0 | Page 27 of 80
(LEFT REC
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 31. 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.
(RIGHT
MIXER 1
MIXER)
AUXILI
BYPAS
MICR
MIXER 2
INTE
MI
(TO
DI
(TO PLAYBACK
X
R
ORD
GITAL
OPHONE
ER)
ARY
S
OUTP
RFACE
ECORD
MIXER
PLA
MIXER 1
OUTPUT
MIXER)
MIXER)
YBACK
UT
RIGHT
2
LEFT
ADC
ADC
MICIN LEFT
MICIN RIGHT
INSEL
INSEL
ADAU1361
DECIMATOR/
DIGITAL
VOLUME
ALC/