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PDU-50WX2
FS781BZB (DIGITAL VIDEO ASSY : IC1802)
• Low EMI Clock IC
•
Pin Assignment (Top View)
Xin
1
Xout
2
S1
3
LF
4
8 Pin SOIC Package
•
Block Diagram
Xin
1(3)
8 pF
Xout
2(4)
VDD
8(2)
•
Pin Function
Pin No.
Pin Name
1/2
Xin / Xout
7/3
S0 / S1
4
LF
6
FSOUT
8
VDD
5
VSS
94
8
VDD
7
S0
FS78x
6
FSOUT
5
VSS
250 K
Reference
Divider
Modulation
Control
8 pF
Power Contol
VDD
Input Control Logic
Logic
5(7)
3(5)
VSS
S1
I/O
TYPE
I/O
Analog
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.
connected to external clock other than crystal, leave Xout (pin 2)
unconnected.
I
CMOS/TTL
Digital control inputs to select input frequency range and output
frequency scaling. Refer to Tables 7 & 8 for selection. S0 has
internal pulldown. S1 has internal pullup.
I
Analog
Loop Filter. Single ended tri-state output of the phase detector. A
two-pole passive loop filter is connected to Loop Filter (LF).
O
CMOS/TTL
Modulated Clock Frequency Output. The center frequency is the
same as the input reference frequency for FS781. Input
frequency is multiplied by 2x and 4x for FS782 and FS784
respectively.
P
Power
Positive Power Supply.
P
Power
Power Supply Ground
Loop Filter
4(6)
Phase
Detector
10 pF.
VCO / N
VSS
(TSSOP Pin #)
7(1)
S0
Description
VCO
Output
Divider
FSOUT
6(8)
and
Mux
If
Xin
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