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AD8666ARZ

Dual JFET-input precision op-amp, 4MHz GBW, 1pA Ibias, 100µV Vos, 5-16V, RR output, SOIC-8

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Manufacturer Part：

AD8666ARZ

Package：

SOIC-8 (Narrow, 3.90mm width)

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Description

Product Overview

The AD8666ARZ from Analog Devices is a dual 16V precision JFET-input operational amplifier with 4 MHz gain-bandwidth product, very low 1 pA input bias current, and rail-to-rail output. Operating from 5V to 16V single supply (±2.5V to ±8V dual supply), it provides precision performance for high-impedance sensor interfaces and low-frequency signal conditioning in an SOIC-8 package.

Key Specifications

  • Channels: 2 (dual)
  • Supply Voltage: 5V ~ 16V (single), ±2.5V ~ ±8V (dual)
  • Gain-Bandwidth Product: 4 MHz
  • Slew Rate: 2.8 V/µs
  • Input Offset Voltage: 100 µV typical, 750 µV max (B grade)
  • Input Bias Current: 1 pA typical
  • Input Offset Current: 0.5 pA typical
  • CMRR: 95 dB typical
  • PSRR: 97 dB typical
  • Open-Loop Gain: 105 dB typical
  • Voltage Noise: 22 nV/√Hz at 1 kHz
  • Current Noise: 50 fA/√Hz at 1 kHz
  • Output Swing: Within 1.5V of rails (10kΩ load)
  • Supply Current: 1.55 mA/amplifier typical
  • Operating Temperature: -40°C ~ 125°C
  • Package: SOIC-8 (Narrow)

Features

  • Ultra-low 1 pA input bias current (JFET input)
  • Low 100 µV typical offset voltage
  • Rail-to-rail output for maximum dynamic range
  • Wide 5V to 16V supply range
  • High CMRR (95 dB) for precision measurement
  • Over-temperature stability

Applications

  • Photodiode transimpedance amplifiers
  • High-impedance sensor interfaces
  • Precision instrumentation
  • Medical ECG/EEG front-ends
  • Electrometer circuits

The AD8666ARZ from Analog Devices is a dual precision JFET-input operational amplifier that combines extremely low input bias current (1 pA typical) with low offset voltage (100 µV typical) and rail-to-rail output capability. The JFET input stage makes it ideal for interfacing with high-impedance sources such as photodiodes, pH electrodes, and piezoelectric sensors where the picoampere bias current prevents loading of the source. The 4 MHz gain-bandwidth product and 2.8 V/µs slew rate are well-suited for precision low-frequency signal conditioning. The wide 5V to 16V supply range accommodates both single-supply and dual-supply applications. The ARZ suffix indicates SOIC-8 packaging rated for the extended -40°C to 125°C temperature range.

The AD8666ARZ uses a JFET-input differential pair followed by a folded-cascode gain stage and a rail-to-rail Class-AB output stage. The JFET input pair provides the extremely low 1 pA gate leakage current characteristic of junction field-effect transistors, which is orders of magnitude lower than bipolar input bias currents. The input offset voltage is trimmed during manufacturing using Analog Devices’ DigiTrim technology, achieving 100 µV typical. The rail-to-rail output stage uses complementary NPN and PNP transistors in a common-emitter configuration, allowing the output to swing to within approximately 1.5V of each supply rail under 10kΩ load. The 4 MHz gain-bandwidth product is set by the internal compensation capacitor, providing unity-gain stability without external components. The high 95 dB CMRR and 97 dB PSRR ensure precision performance in the presence of common-mode and supply noise.

Pin Name Function
1 OUT A Amplifier A output
2 -IN A Amplifier A inverting input
3 +IN A Amplifier A non-inverting input
4 V- Negative supply
5 +IN B Amplifier B non-inverting input
6 -IN B Amplifier B inverting input
7 OUT B Amplifier B output
8 V+ Positive supply (5-16V)

The AD8666ARZ excels in photodiode transimpedance amplifier applications where the 1 pA bias current minimizes DC offset errors even with very high feedback resistor values (up to 100 MΩ). In medical ECG/EEG front-ends, the picoampere input current prevents polarization of the skin-contact electrodes. For electrometer and pH meter applications, the 100 µV offset voltage and 95 dB CMRR enable accurate measurement of millivolt-level signals from high-impedance sources. The 16V supply capability supports ±8V split supplies for applications requiring wide output swing around ground.

Model Manufacturer Key Difference
AD8662ARZ Analog Devices Single channel version, same specs
AD8668ARZ Analog Devices Quad channel version, same family
OPA2140AIDR Texas Instruments JFET, 11MHz, 0.5pA, 36V, SOIC-8
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