ODD/EVEN

FIELD OUTPUT

C3

0.1 PF

RS

14

13

RS

BURST/BACK PORCH

TIMING OUTPUT

12

RS

COMPOSITE

SYNC OUTPUT

11

VCC

10

9

8

RS

RS

VIDEO FORMAT

OUTPUT

VERTICAL SYNC

OUTPUT

VSOUT

VFOUT

GND

VCC3

BPOUT

OEOUT

CSOUT

REXT

GND

VCC1

VIN

GND

VCC2

HSOUT

RS

HORIZONTAL

SYNC OUTPUT

VCC

C2

0.1 PF

7

6

5

4

3

2

1

REXT

10 k:, 1%

C4

4.7 PF

C1

0.1 PF

CIN

1 PF

CVBS/Y/G

VIDEO INPUT

RT

75:

VCC

LMH1981

LMH1981

SNLS214H – APRIL 2006 – REVISED MARCH 2013

www.ti.com

LMH1981 Test Circuit

Figure 2. Test Circuit

The LMH1981 test circuit is shown in Figure 2. The video generator should provide a low-noise, broadcast-

quality signal over 75

Ω coaxial cable which should be impedance-matched with a 75Ω load termination resistor

to prevent unwanted signal distortion. The output waveforms should be monitored using a low-capacitance probe

on an oscilloscope with at least 500 MHz bandwidth. See PCB LAYOUT CONSIDERATIONS for more

information about signal and supply trace routing and component placement.

4

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