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부품번호 | LF355 기능 |
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기능 | JFET Input Operational Amplifiers | ||
제조업체 | National Semiconductor | ||
로고 | |||
전체 23 페이지수
www.DataSheet4U.com
December 2001
LF155/LF156/LF256/LF257/LF355/LF356/LF357
JFET Input Operational Amplifiers
General Description
These are the first monolithic JFET input operational ampli-
fiers to incorporate well matched, high voltage JFETs on the
same chip with standard bipolar transistors (BI-FET™ Tech-
nology). These amplifiers feature low input bias and offset
currents/low offset voltage and offset voltage drift, coupled
with offset adjust which does not degrade drift or
common-mode rejection. The devices are also designed for
high slew rate, wide bandwidth, extremely fast settling time,
low voltage and current noise and a low 1/f noise corner.
Features
Advantages
n Replace expensive hybrid and module FET op amps
n Rugged JFETs allow blow-out free handling compared
with MOSFET input devices
n Excellent for low noise applications using either high or
low source impedance — very low 1/f corner
n Offset adjust does not degrade drift or common-mode
rejection as in most monolithic amplifiers
n New output stage allows use of large capacitive loads
(5,000 pF) without stability problems
n Internal compensation and large differential input voltage
capability
Applications
n Precision high speed integrators
n Fast D/A and A/D converters
n High impedance buffers
n Wideband, low noise, low drift amplifiers
n Logarithmic amplifiers
n Photocell amplifiers
n Sample and Hold circuits
Common Features
n Low input bias current: 30pA
n Low Input Offset Current: 3pA
n High input impedance: 1012Ω
n Low input noise current:
n High common-mode rejection ratio:
n Large dc voltage gain: 106 dB
100 dB
Uncommon Features
j Extremely
fast settling
time to
0.01%
j Fast slew
rate
j Wide gain
bandwidth
j Low input
noise
voltage
LF155/
LF355
4
5
2.5
20
LF156/
LF256/
LF356
1.5
12
5
12
LF257/
LF357
(AV=5)
1.5
50
20
12
Units
µs
V/µs
MHz
Simplified Schematic
ww*3wpF.iDn LaF3t5a7 Sserhiese. et4U.com
BI-FET™, BI-FET II™ are trademarks of National Semiconductor Corporation.
© 2001 National Semiconductor Corporation DS005646
00564601
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Notes for Electrical Characteristics (Continued)
Supply Voltage, VS
TA
THIGH
LF155/156
±15V ≤ VS ≤ ±20V
−55˚C ≤ TA ≤ +125˚C
+125˚C
LF256/257
±15V ≤ VS ≤ ±20V
−25˚C ≤ TA ≤ +85˚C
+85˚C
LF356B
±15V ≤ VS ±20V
0˚C ≤ TA ≤ +70˚C
+70˚C
LF355/6/7
VS= ±15V
0˚C ≤ TA ≤ +70˚C
+70˚C
and VOS, IB and IOS are measured at VCM = 0.
Note 4: The Temperature Coefficient of the adjusted input offset voltage changes only a small amount (0.5µV/˚C typically) for each mV of adjustment from its original
unadjusted value. Common-mode rejection and open loop voltage gain are also unaffected by offset adjustment.
Note 5: The input bias currents are junction leakage currents which approximately double for every 10˚C increase in the junction temperature, TJ. Due to limited
production test time, the input bias currents measured are correlated to junction temperature. In normal operation the junction temperature rises above the ambient
temperature as a result of internal power dissipation, Pd. TJ = TA + θJA Pd where θJA is the thermal resistance from junction to ambient. Use of a heat sink is
recommended if input bias current is to be kept to a minimum.
Note 6: Supply Voltage Rejection is measured for both supply magnitudes increasing or decreasing simultaneously, in accordance with common practice.
Note 7: Settling time is defined here, for a unity gain inverter connection using 2 kΩ resistors for the LF155/6. It is the time required for the error voltage (the voltage
at the inverting input pin on the amplifier) to settle to within 0.01% of its final value from the time a 10V step input is applied to the inverter. For the LF357, AV = −5,
the feedback resistor from output to input is 2kΩ and the output step is 10V (See Settling Time Test Circuit).
Note 8: Max. Power Dissipation is defined by the package characteristics. Operating the part near the Max. Power Dissipation may cause the part to operate outside
guaranteed limits.
Typical DC Performance Characteristics Curves are for LF155 and LF156 unless otherwise
specified.
Input Bias Current
Input Bias Current
Input Bias Current
00564637
Voltage Swing
00564638
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00564639
4
00564640
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Typical AC Performance Characteristics (Continued)
Output Impedance
LF155 Small Signal Pulse Response, AV = +1
00564653
LF156 Small Signal Pulse Response, AV = +1
00564605
LF155 Large Signal Pulse Response, AV = +1
00564606
LF156 Large Signal Puls
Response, AV = +1
00564608
Inverter Settling Time
00564609
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00564655
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7페이지 | |||
구 성 | 총 23 페이지수 | ||
다운로드 | [ LF355.PDF 데이터시트 ] |
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부품번호 | 상세설명 및 기능 | 제조사 |
LF351 | Single Operational Amplifier (JFET) | Fairchild Semiconductor |
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DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |