GS7032 Datasheet, PDF (8/9 Pages) Gennum Corporation – Digital Video Serializer

4. VCO CENTRE FREQUENCY SELECTION
The recommended R_VCO value for auto rate SMPTE 259M-C
applications (270Mb/s) is 374Ω (see the Typical Application
Circuit).
The VCO and an internal divider generate the PLL clock.
5. LOCK DETECT OUTPUT
The Lock Detect output is available from pin 20 and is HIGH
when the loop is locked. When the loop is not locked, the
lock detect circuit mutes the serial data outputs.
6. SERIAL OUTPUTS
The true and complement serial data, SDO and SDO, are
available from pins 24 and 25. These outputs will drive two
75Ω co-axial cables with SMPTE level serial digital video
signals.
R_SET calculation:
R_SET
=
1_----._-1_----5_---4_-----×_-----R_{----L---O----A---D--}
V_SDO
where R_LOAD = R_PULL-UP || Z_O
TYPICAL APPLICATION CIRCUIT
V_CC
J1
LBWC
V_CC
100n
374
44 43 42 41 40 39 38 37 36 35 34
PARALLEL
DATA
INPUTS
PARALLEL
CLOCK
INPUT
1 _PD9
2 _PD8
3 _PD7
4 _PD6
5 _PD5
6 _PD4
7 _PD3
8 _PD2
9 _PD1
10 _PD0
11 _PCLKIN
GS7032
RESET ³³
NC ³²
BYPASS ³¹
NC ³⁰
V_EE ²⁹
NC ²⁸
NC ²⁷
V_EE ²⁶
SDO ²⁵
SDO ²⁴
V_EE ²³
RESET
12 13 14 15 16 17 18 19 20 21 22
V_CC
54.9
100n
75
100n
75
V_CC
All resistors on ohms,
all capacitors in farads,
unless otherwise stated.
V_CC
V_CC
100n
10k
V_CC
220
LOCK
L
1µ
J3
R
L
1µ
J4
R
L = 8.2nH
R = 75Ω
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