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參數(shù)資料
| 型號： | LM6311 |
| 文件頁數(shù)： | 12/14頁 |
| 文件大?。?/td> | 226K |
| 代理商： | LM6311 |
Application Information
(Continued)
If the load is too heavy (too low a resistance) for the output
swing, or the output tries to go too close to either V
a
or V
b
power supply rail, the output will ‘‘foldback’’ as shown in
Figure 4. This will distort the output signal. This should be
avoided. There are many ways to avoid this, such as limiting
the input signal, lowering the gain of the amplifier, or using a
lighter (higher resistance) load.
For designs which require low distortion, it is recommended
to keep the output of the amplifier more than 300 mV away
from the levels where visible distortion can be seen on an
oscilloscope. For designs with wide temperature ranges
which have low distortion requirements, additional margin
may be required, which should be determined expermental-
ly. SeeFigure 5.Figure 5 was recorded when visible distor-
tion was just visible.
External Compensation Capacitor
An external compensation capacitor of 27 pF is recom-
mended for use with the LM6311. The capacitor should be
connected between pin 5 and ground, and should be placed
close to the LM6311. This capacitor increases the phase
margin of the LM6311, allowing it to be used in low gain
circuits, such as A
V
e a
1.
A lower value of compensation capacitor (such as 10 pF)
will increase bandwidth at the expense of phase margin.
This will result in more peaking and ringing with low gain
circuits (A
V
less than 5).
A lower value of compensation capacitor can be useful for
single supply (
a
5V only) circuits.
Designer should avoid very low values of compensation ca-
pacitors in low gain circuits since this will reduce phase mar-
gin and may cause some circuits to oscillate.
Reflections
The output slew rate of the LM6311 is fast enough to pro-
duce reflected signals in many cables and long circuit
traces. For best pulse performance, it may be necessary
to terminate cables and long circuit traces with their charac-
teristic impedance to reduce reflected signals.
Reflections should not be confused with overshoot. Reflec-
tions will depend on cable length, while overshoot will de-
pend on load and feedback resistance and capacitance.
When determining the type of problem, often removing or
drastically shortening the cable will reduce or eliminate re-
flections. Overshoot can exist without a cable attached to
the op amp output.
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
15V, 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 a wide S0-8
for better power dissipation.
This op amp line includesD
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 MHz Voltage Feedback amplifier with 100
mA output current and 4000V/
m
s slew rate. Sup-
ply current of 6.5 mA. Specified at
g
15V and
g
5V.
Information on these parts is available from your National
Semiconductor representative.
SPICE Macromodel
A SPICE macromodel of the LM6311 and many other Na-
tional Semiconductor op amps is available at no charge
from your National Semiconductor representative.
http://www.national.com
12
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM6321M | IC-SM-HIGH SPEED BUFFER |
| LM6321MX | Analog Buffer/Voltage Follower |
| LM6325 | |
| LM6402H | |
| LM6402L | |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM6311IN | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Low Noise High Speed Voltage Feedback Operational Amplifier |
| LM6313 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Power Operational Amplifier |
| LM6313N | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Power Operational Amplifier |
| LM6317 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:120 MHz, Fast Settling, Low Power, Voltage Feedback Amplifier |
| LM6317IM | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:120 MHz, Fast Settling, Low Power, Voltage Feedback Amplifier |
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