LM1237 National Semiconductor Corporation, LM1237 Datasheet - Page 3

• Manufacturer Part Number: LM1237
• Description: 150 Mhz I2c Compatible Rgb Preamplifier With Internal 254 Character Osd And 4 Dacs
• Manufacturer: National Semiconductor Corporation

V
V
A
A
I
I
V
A
R
V
V
V
V
∆V
∆V
V
V
V
Mode 00
V
Mode 01
ABL
ABL
ABL
ABL
V 3.5
V 2.0
ABL
V
OSDHIGH
OSDHIGH
OSDHIGH
OSDHIGH
OSD-out
Min DAC
Max DAC
Max DAC
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
DAC Output Electrical Characteristics
Unless otherwise noted: T
for Min and Max parameters and Note 6 for Typicals. DAC parameters apply to all 4 DACs.
OSD
OSD
ABL Track
Active
Max
Symbol
Symbol
Symbol
TH
Range
Max
/A
/A
(Black)
(White)
V Max
V Max
(Track)
max
10
01
00
ABL Control Range upper limit
ABL Gain Reduction Range
ABL Gain Reduction at 3.5V
ABL Gain Reduction at 2.0V
ABL Input bias current during ABL
ABL input current sink capability
Maximum ABL Input voltage during
clamping
ABL Gain Tracking Error
Minimum Input resistance pins 5, 6,
7.
Maximum OSD Level with OSD
Contrast 11
Maximum OSD Level with OSD
Contrast 10
Maximum OSD Level with OSD
Contrast 01
Maximum OSD Level with OSD
Contrast 00
Difference between OSD Black
Level and Video Black Level (same
channel)
Output Match between Channels
Output Variation between Channels OSD contrast varied from max to
Min output voltage of DAC
Max output voltage of DAC
Max output voltage of DAC in DCF
mode 01
A
A
A
= 25˚C, V
= 25˚C, V
= 25˚C, V
Parameter
Parameter
Parameter
CC
CC
CC
= +5.0V, V
= +5.0V. See Note 7 for Min and Max parameters and Note 6 for Typicals.
= +5.0V, V
IN
IN
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
Note 12, Test Setting 4, AC input
signal. V
Note 12, Test Setting 4, AC input
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.
Palette Set at 111, OSD Contrast =
11, Test Setting 3
Palette Set at 111, OSD Contrast =
10, Test Setting 3
Palette Set at 111, OSD Contrast =
01, Test Setting 3
Palette Set at 111, OSD Contrast =
00, Test Setting 3
Register 08=0x18, Input Video =
Black, Same Channel, Test Setting
8
Palette Set at 111, OSD Contrast =
11, Maximum difference between R,
G and B
min
Register Value = 0x00
Register Value = 0xFF,
DCF[1:0] = 00b
Register Value = 0xFF,
DCF[1:0] = 01b
= 0.70 V
= 0.7V, V
ABL
3
ABL
ABL
ABL
P-P
ABL
(Continued)
, V
= I
Conditions
Conditions
Conditions
= 3.5V
= 2.0V
= V
= V
ABL
ABL
ABL
CC
MAX
= V
, C
MIN GAIN
CC
L
= 8 pF, Video Outputs = 2.0 V
, C
L
P-P
= 8 pF, Video Outputs = 2.0 V
1.85
Min
Min
Min
3.6
4.8
2.8
0.5
2.35
Typ
−11
Typ
Typ
3.8
3.1
2.4
1.7
4.2
−3
20
20
3
3
P-P
1.0
V
. See Note 7
Max
Max
Max
CC
0.1
4.5
0.7
10
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P-P
+
. Setting
Units
Units
Units
MΩ
mA
mV
dB
dB
µA
%
%
%
V
V
V
V
V
V
V
V
V
V