GS1524A 查看數據表（PDF） - Gennum -> Semtech

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GS1524A

Adaptive Cable Equalizer

Gennum -> Semtech 

5. Application Information

5.1 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:

• PCB trace width for HD rate signals is closely matched to SMT component width to

minimize reflections due to change in trace impedance.

• The PCB ground plane is removed under the GS1524A input components to

minimize parasitic capacitance.

• The PCB ground plane is removed under the GS1524A output components to

minimize parasitic capacitance.

• High speed traces are curved to minimize impedance changes.

5.2 Typical Application Circuits

CLI

CD/MUTE

VCC

VCC

10n

10n

BNC

6.4n

GS1524A

1 CLI

CD/MUTE 16

1u

2 VCC

VCC 15

3 VEE

VEE 14

+ 4u7

75

4 SDI

SDO 13

1u

5 SDI

SDO 12

+

6 VEE

VEE 11

7 AGC+

MCLADJ 10

75

37.4

8 AGC-

+

BYPASS 9

4u7

1u

SDO

SDO

NOTE: All resistors in Ohms, capacitors in Farads,

and inductors in Henrys, unless otherwise noted.

Figure 5-1: GS1524A Typical Application Circuit

MCLADJ

BYPASS

GS1524A Adaptive Cable Equalizer

Data Sheet

28852 - 5

June 2009

13 of 16

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