LMH1251MT-NOPB Datasheet, PDF (10/19 Pages) Texas Instruments – YPBPR Path: 70 MHz, −3 dB, 700 mVPP Bandwidth

LMH1251
SNLS193J – AUGUST 2005 – REVISED MARCH 2013
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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.
1 H SYNC_IN
2 V SYNC_IN
3 R_IN
4 G_IN
5 B_IN
6 GND
7 V_CC
8 P_{R IN}
9 P_{B IN}
10 Y
11 SYNC on Y
12 GND
INPUT SELECT 24
AUTO/MANUAL ₂₃
DETECT SELECT
SD/HD SELECT* ²²
POWER SAVE 21
33:
R_OUT 20
33:
G_OUT 19
33:
B_OUT 18
V_CC 17
GND ¹⁶
R_EXT 15
H SYNC_OUT 14
V SYNC_OUT 13
100:
100:
LCD
MONITOR
ADC
OR
CRT
PREAMP
Figure 7. Typical LMH1251 Application
10
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