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PDF LF451 Data sheet ( Hoja de datos )
| Número de pieza | LF451 | |
| Descripción | LF451 Wide-Bandwidth JFET-Input Operational Amplifier | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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December 1995
LF451 Wide-Bandwidth
JFET-Input Operational Amplifier
General Description
The LF451 is a low-cost high-speed JFET-input operational
amplifier with an internally trimmed input offset voltage (BI-
FET IITM technology) The device requires a low supply cur-
rent and yet maintains a large gain bandwidth product and a
fast slew rate In addition well matched high voltage JFET
input devices provide very low input bias and offset cur-
rents The LF451 is pin compatible with the standard
LM741 allowing designers to upgrade the overall perform-
ance of existing designs
The LF451 may be used in such applications as high-speed
integrators fast D A converters sample-and-hold circuits
and many other circuits requiring low input bias current high
input impedance high slew rate and wide bandwidth
Features
Y Internally trimmed offset voltage
5 0 mV (max)
Y Low input bias current
50 pA (typ)
Y Low input noise current
0 01 pA 0Hz (typ)
Y Wide gain bandwidth
4 MHz (typ)
Y High slew rate
13 V ms (typ)
Y Low supply current
3 4 mA (max)
Y High input impedance
1012X (typ)
Y Low total harmonic distortion AV e 10 k0 02% (typ)
RL e 10k VO e 20 Vp–p f e 20 Hz – 20 kHz
Y Low 1 f noise corner
50 Hz (typ)
Y Fast settling time to 0 01%
2 ms (typ)
Connection Diagram
S O Package
Typical Connection
Top View
Order Number LF451CM
See NS Package Number M08A
TL H 9660 – 2
Simplified Schematic
TL H 9660 – 1
BI-FETTM is a trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL H 9660
TL H 9660 – 3
RRD-B30M125 Printed in U S A
1 page  
Pulse Response
Small Signal Inverting
Small Signal Non-Inverting
Large Signal Inverting
TL H 9660 – 6
Large Signal Non-Inverting
TL H 9660 – 7
TL H 9660 – 8
Current Limit (RL e 100X)
TL H 9660 – 9
Application Hints
The LF451CM is an op amp with an internally trimmed input
offset voltage and JFET input devices (BI-FET II) These
JFETs have large reverse breakdown voltages from gate to
source and drain eliminating the need for clamps across the
inputs Therefore large differential input voltages can easily
be accommodated without a large increase in input current
The maximum differential input voltage is independent of
the supply voltages However neither of the input voltages
should be allowed to exceed the negative supply as this will
TL H 9660 – 10
cause large currents to flow which can result in a destroyed
unit
Exceeding the negative common-mode limit with the non-in-
verting input or with both inputs will force the output to a
high state potentially causing a reversal of phase to the
output
In neither case does a latch occur since raising the input
back within the common-mode range again puts the input
stage and thus the amplifier in a normal operating mode
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LF451.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
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