GS1508 데이터 시트보기 (PDF) - Gennum -> Semtech

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GS1508

HD-LINX™ HDTV Cable Driver

Gennum -> Semtech 

5.2 PCB Layout

Special attention must be paid to component layout when designing serial digital interfaces

for HDTV. Figure 5-3 through Figure 5-6 show the artwork for a four-layer printed circuit

evaluation board for the GS1508. The schematic is shown in Figure 5-2. 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 GS1508 output components to minimize

parasitic capacitance

• The PCB ground plane is removed under the GS1508 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 changes due to change of PCB trace width

5.3 GS1508 Evaluation Board

5.3.1 EB1508 PCB Schematic

VCC

TP1

C1 1µ

C2 100n

C3 1n

TP2

R12

50

C14

J7

EDGEMNT_BNC 1µ

C13

J6

EDGEMNT_BNC 1µ

All resistors in Ohms and

all capacitors in Farads

unless otherwise shown.

C16

1n

R13

50

R11

53.6

U2

SDI SDO

SDI SDO

VEE GND

RSET VCC

VCC

C10

R8

100n

75

R7

75

C15

VCC

10n

L2 10n

R9

75

C17 0p5

L3 10n

R10

75

C18 0p5

Figure 5-2: Schematic Diagram for the GS1508 Evaluation Board

C11

J4

4µ7 EDGEMNT_BNC

C12

J5

4µ7

EDGEMNT_BNC

GS1508 HD-LINX™ HDTV Cable Driver

Data Sheet

9500 - 6

August 2010

11 of 14

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