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參數(shù)資料
| 型號： | LM1247 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs |
| 中文描述： | 150 MHz的I2C兼容的RGB前置放大器512個字符OSD光盤，512個字符RAM和4 DAC的內置 |
| 文件頁數(shù)： | 4/48頁 |
| 文件大?。?/td> | 3141K |
| 代理商： | LM1247 |
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DAC Output Electrical Characteristics
(Continued)
Unless otherwise noted: T
= 25C, V
= +5.0V, V
= 0.7V, V
= V
, C
= 8 pF, Video Outputs = 2.0 V
P-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
Max DAC
(Temp)
V
Max DAC
(V
CC
)
Variation in voltage of DAC with
temperature
DAC output voltage variation with
V
CC
Linearity of DAC over its range
Monotonicity of the DAC
Excluding dead zones
Max Load Current
0
<
T
<
70C ambient
±
0.5
mV/C
V
CC
varied from 4.75V to 5.25V, DAC
register set to mid-range (0x7F)
50
mV
Linearity
Monotonicity
5
%
±
0.5
LSB
I
MAX
1.0
1.0
mA
System Interface Signal Characteristics
Unless otherwise noted: T
= 25C, V
= +5.0V, V
= 0.7V, V
= V
, C
= 8 pF, Video Outputs = 2.0 V
P-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
VTH+
VFLYBACK positive switching
guarantee
Spot Killer Voltage
V
Ref
Output Voltage (pin 2)
Logic Low Input Voltage
Logic High Input Voltage
Vertical Blanking triggered
2.0
V
V
SPOT
V
Ref
V
IL
(SCL, SDA)
V
IH
(SCL, SDA)
(Note 17), V
CC
Adjusted to Activate
3.4
1.25
0.5
3.9
1.45
4.3
1.65
1.5
V
CC
+
0.5
V
V
V
3.0
V
I
L
(SCL, SDA)
I
H
(SCL, SDA)
V
OL
(SCL, SDA)
f
H
Min
Logic Low Input Current
Logic High Input Voltage
Logic Low Output Voltage
Minimum Horizontal Frequency
SDA or SCL, Input Voltage = 0.4V
SDA or SCL, Input Voltage = 4.5V
I
O
= 3 mA
PLL & OSD Operational; PLL Range
= 0
PLL & OSD Operational; PLL Range
= 3
Current Absolute Maximum During
Flyback
Design Value
Absolute Maximum During Scan
Not exact - Duty Cycle Dependent
±
10
±
10
0.5
μA
μA
V
25
kHz
f
H
Max
Maximum Horizontal Frequency
110
kHz
I
HFB IN
Max
Horizontal Flyback Input
5
mA
I
IN
I
HFB OUT
Max
I
OUT
I
IN THRESHOLD
t
H-BLANK ON
Peak Current during flyback
Horizontal Flyback Input Current
Peak Current during Scan
I
IN
H-Blank Detection Threshold
H-Blank Time Delay - On
4
mA
μA
μA
μA
700
550
0
+ Zero crossing of I
HFB
to 50% of
output blanking start. I
24
= +1.5mA
Zero crossing of I
HFB
to 50% of
output blanking end. I
24
= 100μA
Test Setting 4, AC input signal
45
ns
t
H-BLANK OFF
H-Blank Time Delay - Off
85
ns
V
BLANK
Max
f
FREERUN
Maximum Video Blanking Level
Free Run H Frequency, including
H Blank
Minimum Clamp Pulse Width
Maximum Low Level Clamp
Pulse Voltage
Minimum High Level Clamp
Pulse Voltage
Clamp Gate Low Input Current
Clamp Gate High Input Current
Time from End of Clamp Pulse to
Start of Video
0
0.25
V
42
kHz
t
PW CLAMP
V
CLAMP MAX
See (Note 15)
Video Clamp Functioning
200
ns
2.0
V
V
CLAMP MIN
Video Clamp Functioning
3.0
V
I
CLAMP
Low
I
CLAMP
High
t
CLAMP-VIDEO
V
23
= 2V
V
23
= 3V
Referenced to Blue, Red and Green
inputs
0.4
0.4
μA
μA
50
ns
L
www.national.com
4
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