GS1504-CTD(2000) 데이터 시트보기 (PDF) - Gennum -> Semtech
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GS1504-CTD Datasheet PDF : 12 Pages
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GS1504 / GS1508 INTERFACING
Figures 30 through 34 show the artwork for a four layer
printed circuit evaluation board for the GS1504. The
schematic is shown in Fig 29. An FR-4 dielectric can be
used, however, controlled impedance transmission lines are
required for PCB traces longer than approximately 1cm.
Note the following PCB artwork features used to optimize
performance:
• PCB trace width for HD rate signals is closely matched
to SMT component width to minimize reflections due to
change in trace impedance.
• The PCB ground plane is removed under the
GS1504/GS1508 input components to minimize
parasitic capacitance.
• The PCB ground plane is removed under the
GS1504/GS1508 output components to minimize
parasitic capacitance.
• High speed traces are curved to minimize impedance
changes.
A picture of the GS1504/08 PCB assembly is shown in
Figure 34.
TP1
VCC
VCC
C1
1µ
C2
100n
C3
1n
TP2
GND
TP3
VCC
CLI
J2
VIDEO IN
R16
L4 10n 75
R1
75
R15
37.5
C6
10n
C7
47p
C8
47p
C5
10n
1 CLI
2 VCC
3 VEE
4 SDI
5 SDI
6 VEE
7 MCLADJ
8 nc
CD/MUTE 16
VCC 15
VEE 14
SDO 13
SDO 12
VEE 11
nc 10
nc 9
2
J3
1
VCC
R4
2k
R8
75
J1 CLOSE
TO
VCC MUTE
C20
10n
C4
10n VCC
C16
1n
R7
75
R11
53.6
VCC
R8
75
U2
1 SDI SDO 8
2 SDI SDO 7
3
4
VEE GND
RSET VCC
6
5
C15
10n
C10
100n
R7
75
VCC
GS1508
L2 12n
R9
75
C17
1p
C18
1p
R10
75
L3 12n
C11 4µ7
J4
SDO
EDGEMNT_BNC
C12 4µ7
J5
SDO
EDGEMNT_BNC
C11 AND C12 ARE
TC3216 TANTALUM
CAPACITORS.
R5
10k
R6
15k
Fig. 29 GS1504/08 Evaluation Board Assembly
All resistors in ohms,
all capacitors in farads,
unless otherwise shown.
11
522 - 05 - 02
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