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參數(shù)資料
| 型號(hào)： | LM6310IN |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | High Speed Low Power Operational Amplifier with TRI-STATE Output |
| 中文描述： | OP-AMP, 9000 uV OFFSET-MAX, PDIP8 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-8 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 279K |
| 代理商： | LM6310IN |
Application Information
(Continued)
VIDEO GAIN OF
a
2
The design of the LM6310 has been optimized for gain of
a
2 video applications. The differential gain and phase per-
formance of the LM6310 can be improved by adding a 1 k
X
pull down to
b
5V to the output. See Figure 1.
Typical values for differential gain and phase are 0.5% dif-
ferential gain and 0.1 degree differential phase.
VIDEO MULTIPLEXING
Figure 2 shows a video multiplexer made from two LM6310
and a logic device which can supply TTL equivalent level to
the DISABLE pins of the LM6310s. Only one DISABLE line
should be high at any one time.
Note that since a floating value on the DISABLE input is the
same as a high input, if all of the logic device’s output go to
a TRI-STATE or high impedance mode, all the LM6310’s
will turn on. This should be avoided.
Use adequate decoupling on the logic device to reduce
noise feedthrough of digital system and power noise to the
video signals. If it is not possible to adequately decouple the
logic device, consider using a small digital buffer, such as a
hex schmidt trigger inverter, which can be decoupled with
multiple capacitors and/or ferrite beads to reduce digital
noise.
Figure 3 shows a four input video multiplexer. With careful
layout, differential gain and phase performance almost as
good as a single LM6310 can be achieved.
A single 1 k
X
pull down to
b
5V should be used. Differential
gain of about 0.05% and differential phase of about 0.3 de-
gree are possible with the 4:1 multiplexer.
OTHER AMPLIFIERS WITH OUTPUT
DISABLE FUNCTIONS
The LMC6681, LMC6682, and LMC6684 are 1 MHz amplifi-
ers with TRI-STATE outputs which can be used for audio
and low frequency multiplexing like the LM6310 is used for
video multiplexing.
OTHER HIGH SPEED AND VIDEO AMPLIFIERS
National Semiconductor has an extensive line of high speed
amplifiers, with a range of operating voltage from 3V single
supply to
g
15, and a range of package types, such as the
space saving SOT23-5 TinyPaK
TM
(3.05 mm x 3.00 mm x
1.43 mmDabout the size of a grain of rice) and the wide
S0-8 for better power dissipation.
This op amp line includes:
LM6171
100 MHz Low Distortion Amplifier with
3000 V/
m
s slew rate. Voltage Feedback design
draws only 2.5 mA. Specified at
g
15V and
g
5V
supplies.
l
LM7131
TinyPaK (SOT23-5) Video amplifier with 70 MHz
gain bandwidth. Specified at 3V, 5V and
g
5V
supplies.
LM7171
200
100 mA output current and 4000 V/
m
s slew rate.
Supply current of 6.5 mA. Specified at
g
15V and
g
5V.
Information on these parts is available from your National
Semiconductor representative.
MHz
Voltage
Feedback
amplifier
with
SPICE MACROMODEL
A SPICE macromodel of the LM6310 and many other Na-
tional Semiconductor op amps is available at no charge
from your National Semiconductor representative.
A
V
e a
2
TL/H/12545–29
FIGURE 1. Improving Video Differential Gain and Phase with 1 k
X
pull down to
b
5V
http://www.national.com
13
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