[AK1542A]
4. Pin Functional Description
Table 1 Pin Functions
No.
1
Name
CPVDD
TEST3
I/O
Pin Functions
Power down
Remarks
P
Power supply for charge pump
Internal pull-down,
Schmidt trigger input
Internal pull-down,
Schmidt trigger input
2
DI
DI
DI
DI
DI
DO
DI
DI
AI
Test pin 3, This pin must be connected to ground.
3
4
5
6
7
8
9
TEST1
LE
Test pin 1, This pin must be connected to ground.
Load enable
Schmidt trigger input
Schmidt trigger input
Schmidt trigger input
DATA
CLK
Serial data input
Serial clock
LD
Lock detect
“Low”
PDN2
PDN1
Power down pin for PLL
Power down signal for LDO
Reference input
Schmidt trigger input
Schmidt trigger input
10 REFIN
11 TEST2
Internal pull-down,
Schmidt trigger input
DI
DO
DO
G
Test pin 2, This pin must be connected to ground.
General-purpose output pin 1
General-purpose output pin 2
Digital ground pin
12 GPO1
13 GPO2
14 DVSS
15 VREF
16 RFINN
17 RFINP
18 PVDD
19 BIAS
20 PVSS
21 CP
“Low”
“Low”
AO
AI
Connect to LDO reference voltage capacitor
Prescaler input
“Low”
AI
Prescaler input
P
Power supply for peripherals
AIO Resistance pin for setting charge pump current
G
Ground pin for peripherals
Charge pump output
AO
“Hi-Z”
22 CPZ
AIO Connect to the loop filter capacitor
Notes 1) & 2)
Notes 1) & 2)
23 SWIN
24 CPVSS
AI
G
Connect to resistance pin for fast Lock Up
Ground pin for charge pump power supply
Note 1) For detailed functional descriptions, see the section “Charge Pump and Loop Filter” in “8. Block Functional
Descriptions”.
MS1399-E-00
2012/3
- 4 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
