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GS1528-CKA Datasheet PDF : 13 Pages
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4. Application Information
GS1528 Data Sheet
4.1 PCB Layout
Special attention must be paid to component layout when designing serial digital
interfaces for HDTV. 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 HD rate signals is closely matched to SMT component
width to minimize reflections due to changes in trace impedance.
The PCB groundplane is removed under the GS1528 output components to
minimize parasitic capacitance.
The PCB ground plane is removed under the GS1528 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 Cirucit
DIFFERENTIAL
DATA INPUT
4u7
49.9
10n
49.9
1
2 SDI
3 SDI
VEE
GS1528
8
SDO 7
SDO 6
SD/HD
4u7
VCC
4
5
VCC
750
10n
*
5.6n
75
VCC
75
75
4u7
10n
75
5.6n*
4u7
* TYPICAL VALUE VARIES WITH LAYOUT
BNC
BNC
SD/HD
NOTE: All resistors in Ohms, capacitors in Farads,
and inductors in Henrys, unless otherwise noted.
16632 - 5 June 2005
11 of 13

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