ASAHI KASEI
[AK4571]
Pin/Function
No.
Signal Name
USB Interface
46
DP
I/O
I/O
Ana / Dig
D
Description
USB bus Non-Inverting pin.
Since the AK4571 is a full-speed device, a 1.5kΩ resistor must be
connected between D+ node to VD.
USB bus Inverting Pin.
Reset Pin. Low input resets the chip.
Schmitt Trigger input.
Suspend Pin
"L": Suspend Mode
“H”: Normal Mode
Crystal Oscillator Output, Connect Crystal Resonator. Connect capacitor
Crystal Oscillator Input, Connect Crystal Resonator. Connect capacitor
System PLL loop filter Pin. Connect 2.7kΩ resistor and 22nF capacitor in
series externally.
Codec PLL loop filter Pin. Connect 120kΩ resistor and 6.8nF capacitor in
series externally.
Codec PLL loop filter Pin. Connect 120kΩ resistor and 6.8nF capacitor in
series externally.
Analog Common Voltage Reference Pin
ADC Common Voltage Reference Pin.
ADC Common Voltage Reference Pin.
Mono Channel Microphone Input
Mono Channel 1
st
Amplifier Output Pin
Mono Channel 2
nd
Amplifier Input Pin
Mono Channel 2
nd
Amplifier Output Pin
Please Connect 1nF capacitor.
Left Channel D/A Out
Right Channel D/A Out
Left Channel Bass Boost Filter Input Pin
Left Channel Bass Boost Filter Output Pin
Right Channel Bass Boost Filter Input Pin
Right Channel Bass Boost Filter Input Pin
Voltage Reference Output for the Microphone’s bias voltage
When the chip goes into Suspend mode, this pin goes to Hi-Z.
47
DN
Reset, Crystal, PLL
45
RSTN
44
SUSN
I/O
I
O
D
D
D
4
5
9
10
11
XTALOUT
XTALIN
LFLT_SYS
LFLT_44K
LFLT_48K
O
I
O
O
O
A
A
A
A
A
Analog Input/Output
12
VCOM
27
VRAD
28
VRDA
14
MICIN
15
AMP1O
16
AMP2I
17
AMP2O
21
24
19
20
22
23
13
LOUT
ROUT
LBFI
LBFO
RBFI
RBFO
MICBIAS
O
O
O
I
O
I
O
O
O
I
O
I
O
O
A
A
A
A
A
A
A
A
A
A
A
A
A
A
External Headphone Amplifier Control
6
EPSW
O
7
STBY
O
8
EMSW
O
External Headphone Amplifier Power Switch Control Pin 1
“H”: Normal Operation
“L”: Suspend Mode
External Headphone Amplifier Power Switch Control Pin 2
“L”: Normal Operation
“H”: Suspend Mode
External Headphone Amplifier Mute Control Pin
“H”: MUTE ON
“L”: MUTE OFF
MS0153-E-03
-4-
2005/06
AKM [ ASAHI KASEI MICROSYSTEMS ]
