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參數(shù)資料
| 型號(hào)： | LM1281 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 85 MHz RGB Video Amplifier System with On Screen Display (OSD) |
| 中文描述： | 85兆赫的RGB視頻放大器系統(tǒng)的屏幕顯示（OSD） |
| 文件頁數(shù)： | 4/14頁 |
| 文件大?。?/td> | 391K |
| 代理商： | LM1281 |
OSD Electrical Characteristics
See DC Test Circuit (Figure 5), T
= 25C; V
CC1
= V
CC2
= 12V; V
13
= 4V; V
14
= 4V; V
16
= 4V; V
Drive
= 4V; V
4
= 4V; V
15
=
0V; V
25
= 1V unless otherwise stated
Symbol
Parameter
Conditions
Typical
(Note 5)
1.2
1.6
1.2
1.6
3.0
0.01
Limit
(Note 6)
0.4
2.0
0.8
2.0
5.0
2.0
Units
V
OSDI
V
OSDh
V
4l
V
4h
I
4l
I
4h
V
O-OSD(1V)
OSD Input Low Input Voltage
OSD Input High Input Voltage
OSD Select Low Input Voltage
OSD Select High Input Voltage
OSD Select Low Input Current
OSD Select High Input Current
OSD
Black Level Output Voltage,
Difference from Video Output
OSD Output Voltage V
PP
OSD Output V
PP
Attenuation
Output Match between Channels
Output Variation between Channels
Video to OSD Switch Time (Note
11)
OSD to Video Switch Time (Note
11)
Video to OSD Propagation Delay
OSD to Video Propagation Delay
OSD Rise Time at V
O
(Note 11)
OSD Fall Time at V
O
(Note 11)
Starting OSD Propagation Delay
Ending OSD Propagation Delay
Video Feedthrough into OSD
V (max)
V (min)
V (max)
V (min)
μA (max)
μA (min)
Video Inputs are Selected
OSD Inputs are Selected
V
4
= 0V
V
4
= 12V
V
25
= 1V
±
85
±
175
mV (max)
V
OSD-out
V
OSD-out
V
OSD-out match
V
OSD-out track
t
r
(OSD S)
V
14
= 4V, V
Drive
= 2V
V
14
= 2V, V
Drive
= 2V
V
14
= 4V, V
Drive
= 2V
V
14
= 4V to 2V, V
Drive
= 2V
V
1
= V
2
= V
3
= 4V (Note 16)
4.5
50
±
2.0
±
3.5
V
PP
30
% (min)
%
%
4
ns
t
f
(OSD S)
V
1
= V
2
= V
3
= 4V (Note 16)
11
ns
t
r-prop
(OSD S)
t
f-prop
(OSD S)
t
r
(OSD)
t
f
(OSD)
t
r-prop
(OSD)
t
f-prop
(OSD)
V
feed
10 kHz
V
1
= V
2
= V
3
= V
13
= V
14
= 4V
V
1
= V
2
= V
3
= V
13
= V
14
= 4V
V
14
= 4V; V
25
= 1V
V
14
= 4V; V
25
= 1V
V
14
= 4V; V
25
= 1V
V
14
= 4V; V
25
= 1V
V
14
= 4V; V
25
= 1V;
V
1
= V
2
= V
3
= 0V
V
14
= 4V; V
25
= 1V;
V
1
= V
2
= V
3
= 0V
11
12
4
10
6.5
9
ns
ns
ns
ns
ns
ns
70
dB
V
feed
10 MHz
Video Feedthrough into OSD
60
dB
Note 1:
Absolute Maximum Rating indicate limits beyond which damage to the device may occur.
Note 2:
Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and
test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may de-
grade when the device is not operated under the listed test conditons.
Note 3:
V
CC
supply pins 6, 9, and 22 must be externally wired together to prevent internal damage during V
CC
power on/off cycles.
Note 4:
Human body model, 100 pF discharged through a 1.5 k
resistor.
Note 5:
Typical specifications are specified at +25C and represent the most likely parametric norm.
Note 6:
Tested limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 7:
The supply current specified is the quiescent current for V
CC1
and V
CC2
with R
L
=
∞
, see Figure 5’s test circuit. The supply current for V
CC2
(pin 22) also
depends on the output load. With video output at 1V DC, the additional current through V
CC2
is 8 mA for Figure 5s test circuit.
Note 8:
Output voltage is dependent on load resistor. Test circuit uses R
L
= 390
.
Note 9:
Measure gain difference between any two amplifiers. V
IN
= 400 mV
PP
.
Note 10:
A
track is a measure of the ability of any two amplifiers to track each other and quantifies the matching of the three attenuators. It is the difference in
gain change between any two amplifiers with the contrast voltage (V
) at either 4V or 2V measured relative to an A
max condition, V
13
= 4V. For example, at A
V
max the three amplifiers’ gains might be 17.1 dB, 16.9 dB, and 16.8 dB and change to 11.2 dB, 10.9 dB and 10.7 dB respectively for V
13
= 2V. This yields the mea-
sured typical
±
0.1 dB channel tracking.
Note 11:
When measuring video amplifier bandwidth or pulse rise and fall times, a double sided full ground plane printed circuit board without socket is recom-
mended. Video amplifier 10 MHz isolation test also requires this printed circuit board. The reason for a double sided full ground plane PCB is that large measurement
variations occur in single sided PCBs.
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 a longer clamp
pulse may be required.
Note 15:
During the AC test the 4V DC level is the center voltage of the AC output signal. For example, if the output is 4 V
PP
the signal will swing between 2V DC
and 6V DC.
Note 16:
When V
= V
= V
= 0V and the video input is 0.7V, then t
(OSD) = 11 ns and t
(OSD) = 4 ns. The Video Output waveform will be inverted from the one
shown in Figure 3 . Thus t
r
(OSD) is actually a fall time and t
f
(OSD) is actually a rise time in this condition.
www.national.com
4
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| LM1281CL WAF | 制造商:Texas Instruments 功能描述: |
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| LM1282BL WAF | 制造商:Texas Instruments 功能描述: |
| LM1282N | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Panasonic Industrial Company 功能描述:IC |
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