ASAHI KASEI
[AK4571]
Pin/Function
No.
Signal Name
I/O Ana / Dig
Description
USB Interface
46
DP
I/O
I/O
D
D
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.
47
DN
USB bus Inverting Pin.
Reset, Crystal, PLL
45
RSTN
I
D
D
Reset Pin. Low input resets the chip.
Schmitt Trigger input.
Suspend Pin
44
SUSN
O
"L": Suspend Mode
“H”: Normal Mode
4
5
9
XTALOUT
XTALIN
LFLT_SYS
O
I
O
A
A
A
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.
10
11
LFLT_44K
LFLT_48K
O
O
A
A
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 Input/Output
12
27
28
14
15
16
17
VCOM
VRAD
VRDA
MICIN
AMP1O
AMP2I
AMP2O
O
O
O
I
O
I
A
A
A
A
A
A
A
Analog Common Voltage Reference Pin
ADC Common Voltage Reference Pin.
ADC Common Voltage Reference Pin.
Mono Channel Microphone Input
Mono Channel 1st Amplifier Output Pin
Mono Channel 2nd Amplifier Input Pin
Mono Channel 2nd Amplifier Output Pin
Please Connect 1nF capacitor.
O
21
24
19
20
22
23
13
LOUT
ROUT
LBFI
LBFO
RBFI
O
O
I
O
I
A
A
A
A
A
A
A
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.
RBFO
MICBIAS
O
O
External Headphone Amplifier Control
6
7
8
EPSW
STBY
EMSW
O
O
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
2005/06
- 4 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
