AK1542A Datasheet, PDF (4/37 Pages) Asahi Kasei Microsystems – 20 to 600MHz Integer-N Frequency Synthesizer

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