Datasheet

INPUT SELECT
AUTO/MANUAL
DETECT SELECT
SD/HD SELECT*
POWER SAVE
R
OUT
G
OUT
B
OUT
V
CC
GND
R
EXT
H SYNC
OUT
V SYNC
OUT
GND
Yc
Y
P
B IN
P
R IN
V
CC
GND
B
IN
G
IN
R
IN
V SYNC
IN
H SYNC
IN
COLOR
DECODER
SYNC
PROCESSOR
1
2
12
11
10
9
8
7
6
5
4
3
24
23
22
21
20
19
18
17
16
15
14
13
LMH1251
SNLS193J –AUGUST 2005–REVISED MARCH 2013 www.ti.com
Connection Diagram
Figure 1. 24-Pin TSSOP - Top View
See PW Package
Truth Table-Input Select
Pin 24 OUT
0 RGBHV input Ch
1 YP
B
P
R
input Ch
Truth Table- Format/Conversion Select
Pin 23 Pin 22 SYNC Format Detection Conversion Scheme
0 0 Bi-Level Manual 480i/480p
0 1 Tri-Level Manual 720p/1080i
1 Outputs 0
(1)
Bi-Level Auto 480i/480p
1 Outputs 1
(1)
Tri-Level Auto 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
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Product Folder Links: LMH1251