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LF356 JFET Input Operational Amplifiers

LF155/LF156/LF256/LF257/LF355/LF356/LF357
FET Input Operational Amplifiers

These 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.

Features
– 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


Simplified Schematic-of-LF356

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
Common Features
– Low input bias current: 30pA
– Low Input Offset Current: 3pA
– High input impedance: 10M?
– High common-mode rejection ratio: 100 dB
– Large dc voltage gain: 106 dB

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