
[AK4145] 
PIN/FUNCTION  
No. 
1 
2 
Pin Name 
FILT 
PSN 
I/O 
- 
I 
Function 
Filter Pin, 4.7nF should be connected between FILT pin and VSS pin. 
Parallel/Serial Select Pin (Internal pull-up pin) 
“L”: Serial control mode, “H”: Parallel control mode 
Composite Video or 27MHz Signal Input Pin. 
Power-Down Mode Pin 
When at “L”, the AK4145 is in the power-down mode and is held in reset. 
The AK4145 must be reset once upon power-up. 
Master Clock Input Pin 
Channel Clock Input Pin 
Audio Serial Data Clock Input Pin 
Audio Serial Data Input Pin 
Sampling Rate Control Pin in parallel control mode 
Control Data Pin in serial control mode 
Audio Data Interface Format Pin in parallel control mode 
Control Data Clock Pin in serial control mode 
Digital I/O Power Supply Pin, DVDD(min:1.7V) 
~
 3.6V 
Digital Power Supply Pin, 1.7 
~
 1.9V 
Ground Pin 
Common Voltage Pin, AVDD/2 
Normally connected to VSS with a 0.1
μ
F ceramic capacitor in parallel with a 10
μ
F 
electrolytic cap. 
Analog Power Supply Pin, 2.7 
~
 3.6V 
Baseband Composite Audio Output Pin 
Note: All input pins except pull-up pin should not be left floating. 
■
 Handling of Unused Pin 
The unused I/O pins should be processed appropriately as below. 
Classification 
Pin Name 
Analog 
CV 
Digital 
FS(Parallel mode), DIF(Parallel mode) 
■
 Output Status at PDN pin = “L” 
Below is the output status of each output pin when the PDN pin = “L”. 
Pin# 
Pin Name 
1 
FILT 
9 
SDA 
14 
VCOM 
16 
CA 
3 
4 
CV27M 
PDN 
I 
I 
5 
6 
7 
8 
9 
MCLK 
LRCK 
BICK 
SDTI 
FS 
SDA 
DIF 
SCL 
TVDD 
DVDD 
VSS 
VCOM 
I 
I 
I 
I 
I 
I/O 
I 
I 
- 
- 
- 
O 
10 
11 
12 
13 
14 
15 
16 
AVDD 
CA 
- 
O 
Setting 
Connect to VSS. 
Connect to VDD or VSS. 
Status 
VSS 
Hi-Z 
VSS 
VCOM(=VSS) 
Rev. 0.3-PB 
2007/12 
- 3 -