GS9068(2010) 데이터 시트보기 (PDF) - Gennum -> Semtech
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GS9068 Datasheet PDF : 11 Pages
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4. Application Reference Design
4.1 PCB Layout
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:
• The PCB groundplane is removed under the GS9068 output components to minimize
parasitic capacitance
• The PCB ground plane is removed under the GS9068 RSET pin and resistor to minimize
parasitic capacitance
• Input and output BNC connectors are surface-mounted in-line to eliminate a
transmission line stub caused by a BNC mounting via high-speed traces, which are
curved to minimize impedance variations due to change of PCB trace width
4.2 Typical Application Circuit
Differential
Data Input
4µ7
49.9
10n
49.9
4µ7
5.6n*
1 SDI
2 SDI
3 VEE
4 RSET
GS9068
SDO 8
SDO 7
NC 6
VCC 5
75
4µ7
75
VCC
10n
75
75
750
VCC
VCC
10n
5.6n*
4µ7
*typical value, varies with layout
BNC
BNC
NOTE: All resistors in Ohms, capacitors in Farads,
and inductors in Henrys, unless otherwise noted.
Figure 4-1: Typical Application Circuit
5. References
Compliant with SMPTE 259M and SMPTE 344M.
GS9068 SD SDI Cable Driver
Data Sheet
22213 - 4
August 2010
9 of 11
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