GS9068 SD SDI Cable Driver

Data Sheet

22213 - 4

August 2010

9 of 11

4. Application Reference Design

4.1 PCB Layout

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 groundplane is removed under the GS9068 output components to minimize

parasitic capacitance

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 Circuit

Figure 4-1: Typical Application Circuit

5. References

Compliant with SMPTE 259M and SMPTE 344M.

GS9068

1

2

3

4

8

7

6

5

SDI

SDI

VEE

RSET

SDO

SDO

NC

VCC

10n

75

5.6n*

4µ7

BNC

VCC

75

5.6n*

10n

75

4µ7

49.9

750

10n

49.9

4µ7

75

BNC

VCC

4µ7

VCC

Differential

Data Input

NOTE: All resistors in Ohms, capacitors in Farads,

and inductors in Henrys, unless otherwise noted.