GS9077 View Datasheet(PDF) - Gennum -> Semtech
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GS9077 Datasheet PDF : 14 Pages
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5. Application Information
GS9077 Data Sheet
5.1 PCB Layout
Special attention must be paid to component layout when designing serial digital
interfaces for SDTV.
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 trace width for SD rate signals is closely matched to SMT
component width to minimize reflections due to changes in trace impedance.
• The PCB ground plane is removed under the GS9077 output components to
minimize parasitic capacitance.
• The PCB ground plane is removed under the GS9077 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.
5.2 Typical Application Circuit
DIFFERENTIAL
DATA INPUT
4.7u
49.9
10n
49.9
4.7u VCC
750
DISABLE
GS9077
1
2
3
4
6
DDI
DDI
VEE
RSET
DISABLE
SDO
SDO
12
11
VCC 9
VCC
10n
5.6n*
75
4.7u
VCC
75
10n
75
75
5.6n*
4.7u
BNC
BNC
* TYPICAL VALUE: VARIES WITH LAYOUT
NOTE: All resistors in Ohms, capacitors in Farads,
and inductors in Henrys, unless otherwise noted.
Figure 5-1: Typical Application Circuit
44619 - 0 May 2007
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