LM1246AAA National Semiconductor, LM1246AAA Datasheet - Page 4

• Manufacturer Part Number: LM1246AAA
• Description: 150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM/ 512 Character RAM and 4 DACs
• Manufacturer: National Semiconductor

www.national.com
V
V
V
V
∆V
∆V
(Ch to Ch)
∆V
∆V
(White)
V
Vid
V
V
A
A
I
I
V
A
R
ABL
ABL
ABL
ABL
V 3.5
V 2.0
ABL
V
OSDHIGH
OSDHIGH
OSDHIGH
OSDHIGH
OSD-out
IP
Video Signal Electrical Characteristics
Unless otherwise noted: T
numbers refer to the definitions in Table 1. Test Settings. See (Note 7) for Min and Max parameters and (Note 6) for Typicals.
OSD Electrical Characteristics
Unless otherwise noted: T
OSD
BL,OSD-Video
OSD
OSD
Threshold
ABL Track
Active
Max
Symbol
Symbol
TH
Range
Max
/A
/A
/V
(Black)
(White)
V Max
V Max
Video
(Track)
max
10
01
00
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)
Difference between OSD Black
Level and Video Black Level
between Channels
Output Match between Channels
Matching of OSD to Video peak to
peak amplitude ratios between
channels, normalized to the
smallest ratio.
Output Variation between Channels OSD contrast varied from max to
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 Bias Current during
ABL
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
CC
CC
= +5.0V, V
= +5.0V. See (Note 7) for Min and Max parameters and (Note 6) for Typicals.
IN
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
(Note 12), Test Setting 4, AC input
signal. V
signal.
(Note 12), Test Setting 4, AC input
signal. I
Table 9. Page RAM Format (9-bit
mode), Test Setting 4, 0.7 V
signal, ABL voltage set to 4.5V and
2.5V.
Test Setting 4.
= 0.70 V
Palette Set at 111, OSD Contrast =
11, RGB Gain = 96, DC Offset = 4
Palette Set at 111, OSD Contrast =
10, RGB Gain = 96, DC Offset = 4
Palette Set at 111, OSD Contrast =
01, RGB Gain = 96, DC Offset = 4
Palette Set at 111, OSD Contrast =
00, RGB Gain = 96, DC Offset = 4
Register 08=0x18, Input Video =
Black, Same Channel, Test Setting
8
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
Palette Set at 111, OSD Contrast =
10, Test Setting 4
min
ABL
ABL
ABL
ABL
4
P-P
= I
= 3.5V
= 2.0V
= V
, V
Conditions
(Continued)
Conditions
ABL
ABL
ABL
MAX
MIN GAIN
= V
CC
, C
P-P
L
= 8 pF, Video Outputs = 2.0 V
input
Min
Min
3.85
3.27
2.70
1.97
Typ
Typ
−12
4.8
2.8
80
−2
20
20
20
3
3
3
V
Max
P-P
Max
1.0
CC
0.1
4.5
10
. Setting
+
Units
Units
mV
mA
MΩ
mV
mV
dB
dB
µA
%
%
%
%
V
V
V
V
V
V
V