LF156QML - JFET Input Operational Amplifiers

This is the first monolithic JFET input operational amplifier to incorporate well matched, high voltage JFETs on the same chip with standard bipolar transistors (BI-FET™ Technology). This amplifier features 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 device is also designed for high slew rate, wide bandwidth, extremely fast settling time, low voltage and current noise and a low 1/f noise corner.

• 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: 30pA
• Low Input Offset Current: 3pA
• High Input Impedance: 10¹²Ω
• 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% 1.5μs
• Fast Slew Rate 12V/µs
• Wide Gain Bandwidth 5MHz
• Low Input Noise Voltage 12 nV / √Hz

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