GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate

Cable Driver

Data Sheet

16632 - 9

August 2010

11 of 13

4. Application Information

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

minimize parasitic capacitance

• Input and output BNC connectors are surface-mounted in-line to eliminate

transmission line stubs 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

Figure 4-1: GS1528 Typical Application Circuit

SD/HD

GS1528

1

2

3

4

8

7

6

5

SDI

SDI

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

DIFFERENTIAL

DATA INPUT

*

*

NOTE: All resistors in Ohms, capacitors in Farads,

and inductors in Henrys, unless otherwise noted.