參數(shù)資料
型號(hào)： LM1270N
廠商： National Semiconductor Corporation
英文描述： Hi-Brite 200 MHz I2C Compatible RGB Image Enhancer with Video Auto Sizing
中文描述： 高亮度場(chǎng)致200兆赫與I2C兼容的RGB視頻自動(dòng)上漿圖像增強(qiáng)
文件頁(yè)數(shù)： 3/27頁(yè)
文件大小： 1302K
代理商： LM1270N
Active Video Signal Electrical Characteristics
(Continued)
Unless otherwise noted: T
A
= 25C, V
CC
= +5V, V
IN
= 0.7V, C
L
= 5 pF, Video Signal Output = 0.7V
P-P
.
Symbol
Parameter
Conditions
Min
(Note 7)
0.5
200
Typ
(Note 6)
0.7
Max
(Note 7)
0.9
Units
I
CLAMP HIGH
t
PW CLAMP
t
CLAMP-VIDEO
Clamp Gate Input Current
Back Porch Clamp Pulse Width
End of Clamp Pulse to Start of
Active Video
Clamp Gate High Output Voltage
Clamp Gate High Output Current
Clamp Gate Low Output Voltage
Clamp Gate Low Output Current
Input Resistance
V
REF
R
EXT
Output Voltage
Spot Killer Voltage
Default Mode, V
24
= 4V
Default Mode (Note 15)
Default Mode, Limit Is Guaranteed
by Design
Internal Clamp Is Output at Pin 24
Internal Clamp Is Output at Pin 24
Internal Clamp Is Output at Pin 24
Internal Clamp Is Output at Pin 24
mA
ns
50
ns
V
CLAMP HIGH OUT
I
CLAMP HIGH OUT
V
CLAMP LOW OUT
I
CLAMP LOW OUT
R
IN-VIDEO
V
REF
R
EXT
V
SPOT
3.2
V
μA
V
μA
M
V
V
10
0.4
10
20
1.44
4.0
10 k
, 1% Resistor; Pin 23 to GND
V
CC
Adjusted to Activate
1.26
3.40
1.64
4.25
External Interface Signals Electrical Characteristics
Unless otherwise noted: T
A
= 25C, V
CC
= +5V, V
IN
= 0.7V, C
L
= 5 pF, Video Output = 0.7 V
P-P
.
Symbol
Parameter
Conditions
Min
(Note 7)
0.5
Typ
(Note 6)
Max
(Note 7)
1.5
V
CC
+
0.5
Units
V
L
(I
2
C)
V
H
(I
2
C)
I
2
C compatible Low Input Voltage
I
2
C compatible High Input Voltage
SDA or SCL Inputs
SDA or SCL Inputs
V
3.0
V
I
L
(I
2
C)
I
H
(I
2
C)
V
OL
(I
2
C)
I
IN THRESHOLD
I
IN-OPERATING
I
2
C compatible Low Input Current
I
2
C compatible High Input Current
I
2
C compatible Low Output Voltage
I
IN
H-Flyback Detection Threshold
Minimum—Insure Normal
Operation
Maximum—Should Not Exceed in
Normal Operation
Peak Current during Flyback
Period, Recommended Design
Range
SDA or SCL, Input Voltage = 0.4V
SDA or SCL, Input Voltage = 4.5V
I
O
= 3 mA
±
10
±
10
0.5
35
μA
μA
V
μA
Lowest Operating Horizontal
Frequency in Given Application
(Note 15)
50
μA
550
I
IN FLYBACK
Operating Range for All Horizontal
Scan Frequencies, Maximum
Current Should Not Exceed 4 mA
(Note 15)
2.0
3.0
4.0
mA
Note 1:
Limits of Absolute Maximum Ratings indicate limits below which damage to the device must not occur.
Note 2:
Limits of operating ratings indicate required boundaries of conditions for which the device is functional, but may not meet specific performance limits.
Note 3:
All voltages are measured with respect to GND, unless otherwise specified.
Note 4:
Human body model, 100 pF capacitor discharged through a 1.5 k
resistor.
Note 5:
Machine Model ESD test is covered by specification EIAJ IC-121-1981. A 200 pF capacitor is charged to the specified voltage, then discharged directly into
the IC with no external series resistor (resistance of discharge path must be under 50
).
Note 6:
Typical specifications are specified at +25C and represent the most likely parametric norm.
Note 7:
Tested limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8:
The supply current specified is the quiescent current for V
CC
with R
L
=
∞
. Load resistors are not required and are not used in the test circuit, therefore all
the supply current is used by the pre-amp.
Note 9:
Linearity Error is the variation in step height of a 16 step staircase input signal waveform with a 0.7 V
P-P
level at the input, subdivided into 16 equal steps,
with each step approximately 100 ns in width.
Note 10:
Input from signal generator: t
, t
<
1 ns. Scope and generator response used for testing: t
r
= 1.1 ns, t
f
= 0.9 ns. Using the RSS technique the scope and
generator response have been removed from the output rise and fall times.
Note 11:
A
V
track is a measure of the ability of any two amplifiers to track each other and quantifies the matching of the three gain stages. It is the difference in
gain change between any two amplifiers with the contrast set to A
V 1/2
and measured relative to the A
V
max condition. For example, at A
V
max the three amplifiers’
gains might be 0.1 dB, 0.1 dB, and 0.2 dB and change to 5.2 dB, 4.9 dB and 4.7 dB respectively for contrast set to A
V 1/2
. This yields a typical gain change
of 5.0 dB with a tracking change of
±
0.2 dB.
Note 12:
Adjust input frequency from 10 MHz (A
V
max reference level) to the 3 dB corner frequency (f
3 dB
).
Note 13:
Measure output levels of the other two undriven amplifiers relative to the driven amplifier to determine channel separation. Terminate the undriven amplifier
inputs to simulate generator loading. Repeat test at f
IN
= 10 MHz for V
SEP 10 MHz
.
Note 14:
A minimum pulse width of 200 ns is guaranteed for a horizontal line of 15 kHz. This limit is guaranteed by design. If a lower line rate is used then a longer
clamp pulse may be required.
L
www.national.com
3
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