Download LMH1251 YP B P R to RGBHV Converter and 2:1 Video Switch

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LMH1251
SNLS193J – AUGUST 2005 – REVISED MARCH 2013
www.ti.com
The RGBHV outputs cannot be used to drive standard 150Ω video loads and require high-bandwidth buffers for
this kind of application. For example, if the LMH1251 is to be designed into a stand-alone converter box
application, the configuration in Figure 8 is recommended. To drive a display monitor over a standard VGA cable,
a wideband, low distortion triple video buffer, such as the LMH6739, can be used with a gain of +2 to drive the
RGB video signals of the LMH1251, and logic inverters can be used to drive its H and V sync signals.
INPUT SELECT
24
1
H SYNCIN
2
V SYNCIN
3
RIN
SD/HD SELECT*
22
4
GIN
POWER SAVE
21
5
BIN
ROUT
20
6
GND
GOUT
19
AUTO/MANUAL 23
DETECT SELECT
33:
33:
LCD
MONITOR
ADC
33:
7
VCC
BOUT
18
8
PR IN
VCC
17
9
PB IN
GND 16
10
Y
11
12
REXT
15
SYNC on Y
H SYNCOUT
14
GND
V SYNCOUT
13
OR
CRT
PREAMP
100:
100:
Figure 7. Typical LMH1251 Application
10
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