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LF155 Datasheet, PDF (1/43 Pages) National Semiconductor (TI) – JFET Input Operational Amplifiers | |||
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LF155, LF156, LF256, LF257
LF355, LF356, LF357
SNOSBH0D â MAY 2000 â REVISED NOVEMBER 2015
LFx5x JFET Input Operational Amplifiers
1 Features
â¢1 Advantages
â Replace Expensive Hybrid and Module FET
Op Amps
â Rugged JFETs Allow Blow-Out Free Handling
Compared With MOSFET Input Devices
â Excellent for Low Noise Applications Using
Either High or Low Source ImpedanceâVery
Low 1/f Corner
â Offset Adjust Does Not Degrade Drift or
Common-Mode Rejection as in Most
Monolithic Amplifiers
â New Output Stage Allows Use of Large
Capacitive Loads (5,000 pF) Without Stability
Problems
â Internal Compensation and Large Differential
Input Voltage Capability
⢠Common Features
â Low Input Bias Current: 30 pA
â Low Input Offset Current: 3 pA
â High Input Impedance: 1012 Ω
â Low Input Noise Current: 0.01 pA/âHz
â High Common-Mode Rejection Ratio: 100 dB
â Large DC Voltage Gain: 106 dB
⢠Uncommon Features
â Extremely Fast Settling Time to 0.01%:
â 4 μs for the LFx55 devices
â 1.5 μs for the LFx56
â 1.5 μs for the LFx57 (AV = 5)
â Fast Slew Rate:
â 5 V/µs for the LFx55
â 12 V/µs for the LFx56
â 50 V/µs for the LFx57 (AV = 5)
â Wide Gain Bandwidth:
â 2.5 MHz for the LFx55 devices
â 5 MHz for the LFx56
â 20 MHz for the LFx57 (AV = 5)
â Low Input Noise Voltage:
â 20 nV/âHz for the LFx55
â 12 nV/âHz for the LFx56
â 12 nV/âHz for the LFx57 (AV = 5)
2 Applications
⢠Precision High-Speed Integrators
⢠Fast D/A and A/D Converters
⢠High Impedance Buffers
⢠Wideband, Low Noise, Low Drift Amplifiers
⢠Logarithmic Amplifiers
⢠Photocell Amplifiers
⢠Sample and Hold Circuits
3 Description
The LFx5x devices are the first monolithic JFET input
operational amplifiers to incorporate well-matched,
high-voltage JFETs on the same chip with standard
bipolar transistors (BI-FET⢠Technology). 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.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
SOIC (8)
4.90 mm à 3.91 mm
LFx5x
TO-CAN (8)
9.08 mm à 9.08 mm
PDIP (8)
9.81 mm à 6.35 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
3 pF in LF357 series
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
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