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參數資料
| 型號： | LM1238AAF/NA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 3 CHANNEL, VIDEO PREAMPLIFIER, PDIP24 |
| 封裝： | N24D |
| 文件頁數： | 18/24頁 |
| 文件大小： | 1207K |
| 代理商： | LM1238AAF/NA |
Video Signal Electrical Characteristics (Continued)
Unless otherwise noted: T
A = 25C, VCC = +5.0V, VIN = 0.70 VP-P,VABL =VCC,CL = 8 pF, Video Outputs = 2.0 VP-P. Setting
numbers refer to the definitions in Table 1. See Note 7 for Min and Max parameters and Note 6 for Typicals.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
A
V Track
Gain Change between channels
Tracking when changing from Test
Setting 8 to Test Setting 5. See
Note 11.
±0.5
dB
V
ABL TH
ABL Control Range upper limit
Note 12, Test Setting 4, AC input
signal.
4.8
V
ABL Range
ABL Gain Reduction Range
Note 12, Test Setting 4, AC input
signal.
2.8
V
A
V 3.25/AV Max
ABL Gain Reduction at 3.25V
Note 12, Test Setting 4, AC input
signal. V
ABL = 3.25V
3
dB
I
ABL Active
ABL Input bias current during ABL
Note 12, Test Setting 4, AC input
signal. V
ABL =VABL MIN GAIN
10
A
I
ABL Max
ABL input current sink capability
Note 12, Test Setting 4, AC input
signal.
1.0
mA
V
ABL Max
Maximum ABL Input voltage during
clamping
Note 12, Test Setting 4, AC input
signal. I
ABL =IABL MAX
V
CC +
0.1
V
R
IP
Minimum Input resistance pins 5, 6,
7.
Test Setting 4.
20
M
OSD Electrical Characteristics
Unless otherwise noted: T
A = 25C, VCC = +5.0V. See Note 7 for Min and Max parameters and Note 6 for Typicals.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
OSDHIGH max
Maximum OSD Level with OSD
Contrast 11
Palette Set at 111, OSD Contrast =
11, Test Setting 3
4.3
V
OSDHIGH 10
Maximum OSD Level with OSD
Contrast 10
Palette Set at 111, OSD Contrast =
10, Test Setting 3
3.8
V
OSDHIGH 01
Maximum OSD Level with OSD
Contrast 01
Palette Set at 111, OSD Contrast =
01, Test Setting 3
3.0
V
OSDHIGH 00
Maximum OSD Level with OSD
Contrast 00
Palette Set at 111, OSD Contrast =
00, Test Setting 3
2.3
V
OSD (Black)
Difference between OSD Black
Level and Video Black Level (same
channel)
Register 08=0x18, Input Video =
Black, Same Channel, Test Setting
8
20
mV
V
OSD (White)
Output Match between Channels
Palette Set at 111, OSD Contrast =
11, Maximum difference between R,
G and B
5%
V
OSD-out (Track)
Output Variation between Channels OSD contrast varied from max to
min
5%
DAC Output Electrical Characteristics
Unless otherwise noted: T
A = 25C, VCC = +5.0V, VIN = 0.7V, VABL =VCC,CL = 8 pF, Video Outputs = 2.0 VP-P. See Note 7
for Min and Max parameters and Note 6 for Typicals. DAC parameters apply to all 4 DACs.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
Min DAC
Min output voltage of DAC
Register Value = 0x00
0.5
0.7
V
Max DAC
Mode 00
Max output voltage of DAC
Register Value = 0xFF,
DCF[1:0] = 00b
3.5
4.2
V
Max DAC
Mode 01
Max output voltage of DAC in DCF
mode 01
Register Value = 0xFF,
DCF[1:0] = 01b
1.85
2.35
V
Max DAC
(Temp)
Variation in voltage of DAC with
temperature
0 < T < 70C ambient
±0.5
mV/C
LM1238
www.national.com
3
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