GS1528B HD-LINX® II Multi-Rate Dual Slew-Rate Cable

Driver

Data Sheet

39623 - 4

August 2010

11 of 14

6. Application Information

6.1 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 GS1528B output components to

minimize parasitic capacitance.

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.

6.2 Typical Application Circuit

Figure 6-1: GS1528B Typical Application Circuit

SD/HD

GS1528B

1

2

3

4

8

7

6

5

DDI

DDI

VEE

SDO

SDO

SD/HD

10n

75

5.6n

4u7

BNC

VCC

75

5.6n

10n

75

4u7

49.9

750

10n

49.9

4u7

75

BNC

VCC

4u7

VCC

* TYPICAL VALUE VARIES WITH LAYOUT

DIFFERENTIAL

DATA INPUT

*

*

NOTE: All resistors in Ohms, capacitors in Farads,

and inductors in Henrys, unless otherwise noted.