Frequency Synthesizer; Pinning Diagram - Philips PM 5390 Service Manual

1M
{
FREQUENCY
SYNTHESIZER
HEF4750V
LSI
(
V
1
28
Vqd
STB
2
27
MOD
TCB
~
26
OUT
OL
4
R
TCA
[I
24
NSi
TRA
[Z
23
NSq
TCC
[I
HEF4750V
22
osc
PCi
1
[l
21
1
XTAL
PC2
[I
20
1
Ag
Aq
[Z
19
1
As
Al
[Z
18
1
*7
A2
Qi
17
|Ae
A3
Qi
16
1
*5
CO
[u
15
1
A4
PINNING
R
phase
comparator
input, reference
V
phase
comparator
input
STB
strobe input
TCA
timing capacitor C/\ pin
TCB
timing capacitor
Cg
pin
TCC
timing capacitor
Cq
pin
TRA
biasing
pin
(resistor R/^)
PCi
analogue phase
comparator output
PC2
digital
phase comparator output
MOD
phase modulation
input
OL
out-of-lock indication
OSC
reference oscillator/buffer input
XTAL
reference oscillator/buffer output
Aq
to
Ag
programming
inputs/programmable
NSq,
N$i
divider
programming
inputs, prescaler
OUT
reference divider
output
7Z84472
Fig.
1
Pinning diagram.
HEF4750VD:
28-lead
DIL; ceramic
(cerdip)
(SOT-135A).
I
I
crystal
standard
^
external circuitry
7Z84473
Fig,
2 Block
diagram comprising
five
basic functions:
phase comparator
1
(PCI), phase
comparator 2 (PC2), phase modulator,
reference
oscillator
and
reference divider.
These
functions are
described
separately.
N.B.
PC^
= analogue output; PC
2 =
3-state
output.
October 1980