AK1590 Datasheet, PDF (4/36 Pages) Asahi Kasei Microsystems – 1GHz Delta-Sigma Fractional-N Frequency Synthesizer

[AK1590]
4. Pin Functional Description
Table 1 Pin Function
No. Name I/O
Pin Functions
Power down
Remarks
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
Internal pull-down,
Schmidt trigger input
Internal pull-down,
Schmidt trigger input
Schmidt trigger input
5 DATA DI Serial data input
Schmidt trigger input
6
CLK DI Serial clock
Schmidt trigger input
7
LD
DO Lock detect
Low
8 PDN2 DI Power down pin for PLL
Schmidt trigger input
9 PDN1 DI Power down signal for LDO
Schmidt trigger input
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
Low
Internal pull-down,
Schmidt trigger input
13 GPO2 DO General-purpose output pin 2
Low
14 DVSS G Digital ground pin
15 VREF AIO Connect to LDO reference voltage capacitor
Low
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 output
current
20 PVSS G Ground pin for peripherals
21
CP
AO Charge pump output
Hi-Z
22 CPZ AIO Connect to the loop filter capacitor
Note 1, Note 2
23 SWIN AI Connect to resistance pin for Fast Lockup
Note 1, Note 2
24 CPVSS G Ground pin for charge pump
Note 1)
Note 2)
Note 3)
For detailed functional descriptions, see the section “Charge Pump and Loop Filter” in “8. Block Functional
Description” below.
The input voltage from [CPZ] pin is used in the internal circuit. [CPZ] pin must not be open even when the Fast
Lockup feature is unused. For the output destination from [CPZ] pin, see “Fig.5 Loop Filter Schematic”.
[SWIN] pin could be open when the Fast Lockup feature is not used.
The state of loop filter switch is ON when “[PDN1]=Low, [PDN2]=Low” or “[PDN1]=High, [PDN2]=Low”.
Power down means 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
MS1478-E-01
4
2013/2