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| LMH1251MT-NOPB Datasheet, PDF (2/19 Pages) Texas Instruments – YPBPR Path: 70 MHz, −3 dB, 700 mVPP Bandwidth | |||
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LMH1251
SNLS193J â AUGUST 2005 â REVISED MARCH 2013
Connection Diagram
www.ti.com
H SYNCIN 1
V SYNCIN 2
RIN 3
GIN 4
BIN 5
GND 6
VCC 7
PR IN 8
PB IN 9
COLOR
DECODER
Y 10
Yc 11
GND 12
SYNC
PROCESSOR
24 INPUT SELECT
23
AUTO/MANUAL
DETECT SELECT
22 SD/HD SELECT*
21 POWER SAVE
20 ROUT
19 GOUT
18 BOUT
17 VCC
16 GND
15 REXT
14 H SYNCOUT
13 V SYNCOUT
Figure 1. 24-Pin TSSOP - Top View
See PW Package
Pin 23
0
0
1
1
Pin 24
0
1
Pin 22
0
1
Outputs 0(1)
Outputs 1(1)
Truth Table-Input Select
OUT
RGBHV input Ch
YPBPR input Ch
Truth Table- Format/Conversion Select
SYNC
Format Detection
Bi-Level
Manual
Tri-Level
Manual
Bi-Level
Auto
Tri-Level
Auto
Conversion Scheme
480i/480p
720p/1080i
480i/480p
720p/1080i
(1) When Pin 23 is set high, the LMH1251 is in Auto Mode, in which it can detect the incoming video format (SD or HD) and apply the
appropriate color conversion and sync processing. With Auto Mode, Pin 22 becomes an output pin, and will either output a logic high or
low to notify the user of the format that is being detected by the LMH1251. If Pin 23 is set low, the LMH1251 is in Manual Mode, in
which the user must specify the format with Pin 22. With Manual Mode, Pin 22 is an input pin. Since Pin 22 is a bi-directional pin, care
must be given not to apply any voltages to it when it is in the Auto Mode, in which it functions as an output pin. The use of the Auto
Mode with Pin 22 left floating is typically recommended.
Truth Table-Power Save
Pin 21
Low Power Mode
0
Disable
1
Enabled
2
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Copyright © 2005â2013, Texas Instruments Incorporated
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