Pioneer PDP-433PU Service Manual page 106

1
FS781BZB (DIGITAL VIDEO ASSY: IC1802)
Low EMI Clock IC
Pin Assignment (Top View)
A
Xin 1
Xout 2
FS78x
S1 3
4
LF
8 Pin SOIC Package
B
Block Diagram
Xin
1(3)
C
Xout
2(4)
VDD
8(2)
D
Pin Function
No. Pin Name I/O
1/2 Xin/Xout I/O
7/3 S0/S1
E
4 LF
6 FSOUT O
8 VDD P
5 VSS P
F
106
1
2
8 VDD
7 S0
6 FSOUT
5
VSS
250 K
Reference
Divider
8 pF
Modulation
Control
8 pF
Power Contol
VDD Input Control Logic
Logic
3(5)
5(7)
VSS S1
Type
Pins form an on-chip reference oscillator when connected to terminals of an external parallel
resonant crystal. Xin may be connected to TTL/CMOS external clock source. If Xin connected
Analog
to external clock other than crystal, leave Xout (pin2) unconnected.
Digital control inputs to select input frequency range and output frequency scaling. Refer to
I CMOS/TTL
Tables 7 and 8 for selection. S0 has internal pulldown. S1 has internal pullup.
Loop Filter. Single ended tri-state output of the phase detector. A two-pole passive loop filter
I Analog
is connected to Loop Filter (LF).
Modulated Clock Frequency Output. The center frequency is the same as the input reference
CMOS/TTL frequency for FS781. Input frequency is multipled by 2X and 4X for FS782 and FS784
respectively.
Power Positive Power Supply
Power Power Supply Ground
2
3
Loop Filter
4(6)
Phase
Detector
10 pF.
VCO / N
VSS
7(1)
S0
Function
PDP-433PU
3
4
VCO
Output
Divider
FSOUT
6(8)
and
Mux
(TSSOP Pin #)
4