AK1543 Datasheet, PDF (4/35 Pages) Asahi Kasei Microsystems – 1300MHz Delta-Sigma FractionalSigma -N Frequency Synthesizer

[AK1543]
4. Pin Functional Description
No. Name I/O
Table 1 Pin Function
Pin Functions
1 CPVDD P Power supply for charge pump
2 TEST4 DI Test pin 4
3 TEST1
4 LE
5 DATA
6 CLK
7 LD
8 PDN2
9 PDN1
10 REFIN
11 TEST2
DI Test pin 1
DI Load enable
DI Serial data input
DI Serial clock
DO Lock detect
DI Power down pin for PLL
DI Power down signal for LDO
AI Reference input
DI Test pin 2
12 TEST3 DI Test pin 3
13 VREF1 AIO Connect to LDO reference voltage capacitor
14 DVSS G Digital ground pin
15 VREF2 AIO Connect to LDO reference voltage capacitor
16 RFINN AI Prescaler input
17 RFINP AI Prescaler input
18 PVDD
19 BIAS
20 PVSS
P Power supply for peripherals
AIO
Resistance pin for setting charge pump output
current
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 lockup
24 CPVSS G Ground pin for charge pump
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”
Internal pull-down,
Schmidt trigger input
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
Description” below.
Note 2) The input voltage from the [CPZ] pin is used in the internal circuit. The [CPZ] pin must not be open even
when the fast lockup feature is unused. For the output destination from the [CPZ] pin, see “P.12 Fig.5 Loop
Filter Schematic”. The [SWIN] pin could be open even when the first lockup feature is not used.
Note 3) Power down refers to the state where [PDN1]=[PDN2]=”Low” after power-on.
AI: Analog input pin
DO: Digital output pin
AO: Analog output pin
P: Power supply pin
AIO: Analog I/O pin
G: Ground pin
DI: Digital input pin
MS1206-E-02
4
2013/03