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National Semiconductor에서 제조한 전자 부품 LF147은 전자 산업 및 응용 분야에서
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부품번호 LF147 기능
기능 Wide Bandwidth Quad JFET Input Operational Amplifiers
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LF147 데이터시트, 핀배열, 회로
May 1999
LF147/LF347
Wide Bandwidth Quad JFET Input Operational Amplifiers
General Description
The LF147 is a low cost, high speed quad JFET input opera-
tional amplifier with an internally trimmed input offset voltage
(BI-FET IItechnology). The device requires a low supply
current 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
currents. The LF147 is pin compatible with the standard
LM148. This feature allows designers to immediately up-
grade the overall performance of existing LF148 and LM124
designs.
The LF147 may be used in applications such as high speed
integrators, fast D/A converters, sample-and-hold circuits
and many other circuits requiring low input offset voltage,
low input bias current, high input impedance, high slew rate
and wide bandwidth. The device has low noise and offset
voltage drift.
Features
n Internally trimmed offset voltage: 5 mV max
n Low input bias current: 50 pA
n Low input noise current:
n Wide gain bandwidth: 4 MHz
n High slew rate: 13 V/µs
n Low supply current: 7.2 mA
n High input impedance: 1012
n Low total harmonic distortion AV=10,: <0.02%
RL=10k, VO=20 Vp-p, BW=20 Hz−20 kHz
n Low 1/f noise corner: 50 Hz
n Fast settling time to 0.01%: 2 µs
Simplified Schematic
14 Quad
Connection Diagram
Dual-In-Line Package
DS005647-13
DS005647-1
Note 1: Available per SMD #8102306, JM38510/11906.
Top View
Order Number LF147J, LF347M, LF347BN,
LF347N or LF147J/883 (Note 1)
See NS Package Number J14A, M14A or N14A
BI-FET IIis a trademark of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS005647
www.national.com




LF147 pdf, 반도체, 판매, 대치품
Typical Performance Characteristics
Input Bias Current
Input Bias Current
Supply Current
DS005647-14
Positive Common-Mode
Input Voltage Limit
DS005647-15
Negative Common-Mode
Input Voltage Limit
DS005647-16
Positive Current Limit
DS005647-17
Negative Current Limit
Output Voltage Swing
DS005647-18
DS005647-19
Output Voltage Swing
DS005647-20
DS005647-21
DS005647-22
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LF147 전자부품, 판매, 대치품
Pulse Response RL=2 k, CL=10 pF
Small Signal Inverting
Small Signal Non-Inverting
DS005647-4
Large Signal Inverting
DS005647-5
Large Signal Non-Inverting
DS005647-6
Current Limit (RL=100)
DS005647-7
DS005647-8
Application Hints
The LF147 is an op amp with an internally trimmed input off-
set 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 ac-
commodated without a large increase in input current. The
maximum differential input voltage is independent of the sup-
ply voltages. However, neither of the input voltages should
be allowed to exceed the negative supply as this will cause
large currents to flow which can result in a destroyed unit.
Exceeding the negative common-mode limit on either input
will force the output to a high state, potentially causing a re-
versal of phase to the output. Exceeding the negative
common-mode limit on both inputs will force the amplifier
output to a high state. 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.
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