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GS1528-CKA

HD-LINX™ II Multi-Rate SDI Dual Slew-Rate Cable Driver

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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

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