LM1276 National Semiconductor Corporation, LM1276 Datasheet - Page 5

• Manufacturer Part Number: LM1276
• Description: 150 Mhz I2c Compatible Rgb Preamplifier With Internal 512 Character Osd Rom, 512 Character Ram And 4 Dacs
• Manufacturer: National Semiconductor Corporation

A
A
A
A
Vid
V
V
A
A
I
V
A
R
V
V
V
V
V
V
V
V
∆V
ABL
V
V
V
V
ABL
ABL
V 3.5
V 2.0
ABL
V
OSDHIGH
OSDHIGH
OSDHIGH
OSDHIGH
OSDHIGH
OSDHIGH
OSDHIGH
OSDHIGH
IP
Video Signal Electrical Characteristics
Unless otherwise noted: T
numbers refer to the definitions in Table 1. See (Note 7) for Min and Max parameters and (Note 6) for Typicals.
OSD Electrical Characteristics
Unless otherwise noted: T
OSD
Threshold
G-50%
G-Min
Match
Track
ABL Track
Max
Symbol
Symbol
TH
Range
Max
/A
/A
(Black)
V Max
V Max
max
110
101
100
011
010
001
000
Maximum OSD Level with OSD
Contrast 111
Maximum OSD Level with OSD
Contrast 110
Maximum OSD Level with OSD
Contrast 101
Maximum OSD Level with OSD
Contrast 100
Maximum OSD Level with OSD
Contrast 011
Maximum OSD Level with OSD
Contrast 010
Maximum OSD Level with OSD
Contrast 001
Maximum OSD Level with OSD
Contrast 000
Difference between OSD Black
Level and Video Black Level (same
channel)
Gain Attenuation
Maximum Gain Attenuation
Maximum Gain Match between
Channels
Gain Change between Channels
Video Threshold
ABL Control Range Upper Limit
ABL Gain Reduction Range
ABL Gain Reduction at 3.5V
ABL Gain Reduction at 2.0V
ABL Input Current Sink Capability (Note 12), Test Setting 4, AC input
Maximum ABL Input Voltage
during Clamping
ABL Gain Tracking Error
Minimum Input Resistance (pins
5, 6, 7)
A
A
= 25˚C, V
= 25˚C, V
Parameter
Parameter
@
50%
CC
CC
= +5.0V, V
= +5.0V. See (Note 7) for Min and Max parameters and (Note 6) for Typicals.
IN
Test Setting 6, AC input signal.
Test Setting 7, AC input signal.
Test Setting 3, AC input signal.
Tracking when changing from Test
Setting 8 to Test Setting 5. See (Note
11).
Normal Operation
(Note 12), Test Setting 4, AC input
signal.
(Note 12), Test Setting 4, AC input
signal.
(Note 12), Test Setting 4, AC input
signal. V
(Note 12), Test Setting 4, AC input
signal. V
signal.
(Note 12), Test Setting 4, AC input
signal. I
(Note 9), Test Setting 4, 0.7 V
input signal, ABL voltage set to 4.5V
and 2.5V.
Test Setting 4.
= 0.70 V
Palette Set at 111, OSD Contrast =
111, Test Setting 3
Palette Set at 111, OSD Contrast =
110, Test Setting 3
Palette Set at 111, OSD Contrast =
01, Test Setting 3
Palette Set at 111, OSD Contrast =
100, Test Setting 3
Palette Set at 111, OSD Contrast =
011, Test Setting 3
Palette Set at 111, OSD Contrast =
010, Test Setting 3
Palette Set at 111, OSD Contrast =
001, Test Setting 3
Palette Set at 111, OSD Contrast =
000, Test Setting 3
Register 0x8438=0x18, Input Video
= Black, Same Channel, Test
Setting 8
ABL
ABL
ABL
P-P
5
= I
= 3.5V
= 2.0V
, V
Conditions
(Continued)
Conditions
ABL
ABL
MAX
= V
CC
, C
L
P-P
= 8 pF, Video Outputs = 2.0 V
Min
Min
−4.0
±
±
3.02
2.91
2.79
2.67
2.55
2.43
2.32
2.20
Typ
Typ
−11
−12
4.8
2.8
80
−2
20
0.5
0.5
V
±
Max
Max
P-P
2.5
CC
0.1
5.0
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130
. Setting
+
Units
Units
MΩ
mV
mA
mV
dB
dB
dB
dB
dB
dB
%
V
V
V
V
V
V
V
V
V
V
V