JFET Input Operational Amplifiers
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LF155, LF156, LF256, LF257 LF3...
Description
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Technical Documents
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LF155, LF156, LF256, LF257 LF355, LF356, LF357
SNOSBH0D – MAY 2000 – REVISED NOVEMBER 2015
LFx5x JFET Input Operational Amplifiers
1 Features
1 Advantages – Replace Expensive Hybrid and Module FET Op Amps – Rugged JFETs Allow Blow-Out Free Handling Compared With MOSFET Input Devices – Excellent for Low Noise Applications Using Either High or Low Source Impedance—Very Low 1/f Corner – Offset Adjust Does Not Degrade Drift or Common-Mode Rejection as in Most Monolithic Amplifiers – New Output Stage Allows Use of Large Capacitive Loads (5,000 pF) Without Stability Problems – Internal Compensation and Large Differential Input Voltage Capability
Common Features – Low Input Bias Current: 30 pA – Low Input Offset Current: 3 pA – High Input Impedance: 1012 Ω – Low Input Noise Current: 0.01 pA/√Hz – High Common-Mode Rejection Ratio: 100 dB – Large DC Voltage Gain: 106 dB
Uncommon Features – Extremely Fast Settling Time to 0.01%: – 4 μs for the LFx55 devices – 1.5 μs for the LFx56 – 1.5 μs for the LFx57 (AV = 5) – Fast Slew Rate: – 5 V/µs for the LFx55 – 12 V/µs for the LFx56 – 50 V/µs for the LFx57 (AV = 5) – Wide Gain Bandwidth: – 2.5 MHz for the LFx55 devices – 5 MHz for the LFx56 – 20 MHz for the LFx57 (AV = 5) – Low Input Noise Voltage: – 20 nV/√Hz for the LFx55 – 12 nV/√Hz for the LFx56 – 12 nV/√Hz for the LFx57 (AV = 5)
2 Applications
Precision High-Speed Integrators Fast D/A and ...
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