ACS422A68TAGZBX8 IDT, ACS422A68TAGZBX8 Datasheet - Page 48

• Manufacturer Part Number: ACS422A68TAGZBX8
• Description: Interface - CODECs
• Manufacturer: IDT

Specifications of ACS422A68TAGZBX8

• Rohs: yes
• Part # Aliases: IDTACS422A68TAGZBX8

ACS422x68
LOW-POWER, HIGH-FIDELITY, INTEGRATED CODEC
©2011 INTEGRATED DEVICE TECHNOLOGY, INC.
4. INPUT AUDIO PROCESSING
06h
07h
4.1.
The ACS422x68 provides multiple high impedance, low capacitance AC-coupled analog inputs with an input signal
path to the stereo ADCs. Prior to the ADC, there is a multiplexor that allows the system to select which input is in use.
Following the mux, there is a programmable gain amplifier and also an optional microphone gain boost. The gain of the
PGA can be controlled either by the system, or by the on-chip level control function. The stereo record path can also
operate with the two channels mixed to mono either in the analog or digital domains.
Signal inputs are biased internally to AVSS but AC coupling capacitors are required when connecting microphones
(due to the 2.5V microphone bias) or when offsets would cause unacceptable “zipper noise” or pops when changing
PGA or boost gain settings. To avoid audio artifacts, the line inputs are kept biased to analog ground when they are
muted or the device is placed into standby mode.
ADC Leftt Digital Volume
ADC Right Digital Volume
mute
mute
-71.25 to +24 dB
In 0.375 dB steps
-71.25 to +24 dB
In 0.375 dB steps
Analog Inputs
VOL
VOL
14h
16h
Configuration
ADC Output
ADC Data Select
ADC Polarity
SRC
SRC
Figure 17. Input Audio Processing
16h HPF enable
HPF
HPF
Management
ADC Power
1Ah
ADCR
ADCL
48
Automatic Level Control
0Eh
0Fh
10h
11h
12h
-17.25 to +30dB in 0.75dB steps
-17.25 to +30dB in 0.75dB steps
ALC Control 0
ALC Control 1
ALC Control 2
ALC Control 3
Noise Gate Control
08h
09h
Left input volume
Right input volume
PGA
PGA
AGND
1Ah
Vref
Mic Bias
+0/+10/+20/+30 dB
+0/+10/+20/+30 dB
0Ch
0Dh
Boost
Boost
+
-
08h
09h
Left Boost
18h
Right Boost
Zero Cross Detect
Mono Mix
D2S
MIC Bias
0Bh
D2S
S
+
-
0Ch
0Dh
D2S Input Select
Left Input Select
Right Input Select
ACS422X68
RIN1
RIN2
RIN3
LIN1
LIN2
LIN3
D2S
D2S
V1.6 01/13
RIN1
RIN2
LIN1
LIN2