NEC DB2000, Service Manual

Page: 133 / 199

M5-TY0429 DUAL FREQUENCY SYNTHESIZER IC201
1
2
3
4
RF
6
7
8
9
10 11
12
13
14
15
16
17
18
19
20 Vcc1
Vp1
Vcc2
Vp2
Do RF Do IF
GND
GND
f
IN
5
f
IN
RF
f
IN
IN
IF
f IF
GND
OSC
in
GND
Fo LD
GND
LE
DATA
CLOCK
PIN PIN PIN NAME PIN NAME I/O I/O DESCRIPTION DESCRIPTION
1 VCC1 - Input power supply voltage (2.7V -5.5V), for RF
analogue/digital circuits. VCC1 must equal VCC2.
2 Vp1 -
Power supply for charge pump. Must be
≥
VCC.
3 Do RF O Internal charge pump output.
4 GND - Ground for digital circuitry
5 f
IN
RF - RF prescaler input. Small signal input from VCO.
6 f
IN
RF - RF prescaler complementary input.
7 GND Ground for RF analogue circuitry.
8 OSCin - Oscillator input.
9 GND - Digital ground.
10 Fo LD O N/C
11 CLOCK I Clock input. Data is clocked in on the rising edge.
12 DATA I Binary serial data input.
13 LE I Load enable control input, for internal shift
registers.
14 GND - Ground for IF analogue circuitry
15 f
IN
IF - RF prescaler complementary input.
16 f
IN
IF - IF prescaler input. Small signal input from the
VCO.
17 GND - Digital ground.
18 Do IF O Internal charge pump IF output.
19 Vp2 -
Power supply for charge pump. Must be
≥
VCC.
20 VCC - Input power supply voltage for IF analogue/digital
and internal oscillator circuits.