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AD824ARZ-14

Quad FET-input op amp, 2MHz, 2pA Ib, rail-to-rail out, 3-30V, SOIC-14

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Manufacturer Part：

AD824ARZ-14

Package：

SOIC-14 (narrow, 8.75 x 3.9 mm)

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Description

Product Overview

The AD824ARZ-14 is a quad FET-input, single-supply, rail-to-rail output operational amplifier from Analog Devices with 2 MHz bandwidth, 2 pA input bias current, and 500 µA per amplifier supply current in a 14-pin SOIC package.

Key Specifications

Configuration Quad (4 amplifiers)
Supply Voltage 3 V to 30 V (single) or ±15 V (dual)
Gain-Bandwidth Product 2 MHz
Slew Rate 2 V/µs
Input Bias Current 2 pA typical
Input Offset Voltage 0.1 mV typical (AD824A grade)
Input Impedance 10^13 Ω parallel 3.3 pF
Output Swing Rail-to-rail (within 15 mV of rails)
Supply Current/Amplifier 500 µA typical
CMRR 80 dB typical
Channel Separation -123 dB at 1 kHz
Voltage Noise Density 16 nV/√Hz at 1 kHz
Current Noise Density 0.8 fA/√Hz at 1 kHz
Capacitive Load Drive 350 pF without oscillation
Operating Temperature -40°C to +85°C
Package SOIC-14 (narrow)

Features

  • Single supply operation: 3 V to 30 V
  • Ultra-low input bias current: 2 pA (FET input)
  • Rail-to-rail output swing within 15 mV of supplies
  • Wide input voltage range beyond supplies without phase inversion
  • Low supply current: 500 µA per amplifier
  • Excellent channel separation: -123 dB
  • Drives 350 pF capacitive loads without oscillation
  • No phase reversal or latch-up on overdriven inputs

Applications

  • Photodiode preamplifiers
  • Battery-powered instrumentation
  • Medical instrumentation
  • High-impedance sensor amplifiers
  • DAC output amplifiers

The AD824ARZ-14 is a quad FET-input operational amplifier from Analog Devices featuring rail-to-rail outputs and single-supply operation from 3V to 30V (or dual supplies up to ±15V). The JFET input stage provides ultra-low 2 pA input bias current and 10^13 Ω input impedance, making it ideal for high-impedance source applications. The unique input stage design allows input voltages to safely extend beyond the negative supply and up to the positive supply without phase inversion or latch-up. The output swings to within 15 mV of the supply rails, maximizing dynamic range in single-supply systems. Each amplifier consumes only 500 µA of supply current while delivering 2 MHz bandwidth and 2 V/µs slew rate. The -123 dB channel separation at 1 kHz ensures minimal crosstalk between amplifiers in the same package.

The AD824 uses a JFET-input front end fabricated on ADI’s complementary bipolar (CB) process. The input stage consists of N-channel JFETs that provide the extremely low gate current (2 pA typical) and high input impedance (10^13 Ω). The JFET drains connect to a PNP differential pair that performs the voltage amplification. A unique input protection network allows the input common-mode voltage to extend beyond the negative supply rail and up to the positive rail without causing phase inversion or latch-up, a common problem in many other op amps. The output stage uses a complementary push-pull architecture with rail-to-rail capability, driving the output to within 15 mV of either supply rail under light loads. The output stage includes short-circuit protection (±12 mA typical) and can drive capacitive loads up to 350 pF without oscillation. The four amplifiers share supply pins but have independent signal paths with excellent -123 dB channel separation achieved through careful layout and isolation structures on the die.

Pin Name Type Description
1 OUT A Output Amplifier A output
2 -IN A Input Amplifier A inverting input
3 +IN A Input Amplifier A non-inverting input
4 V+ Power Positive supply
5 +IN B Input Amplifier B non-inverting input
6 -IN B Input Amplifier B inverting input
7 OUT B Output Amplifier B output
8 OUT C Output Amplifier C output
9 -IN C Input Amplifier C inverting input
10 +IN C Input Amplifier C non-inverting input
11 V- Power Negative supply / GND (single supply)
12 +IN D Input Amplifier D non-inverting input
13 -IN D Input Amplifier D inverting input
14 OUT D Output Amplifier D output
  • Photodiode Preamplifiers: 2 pA input bias current and 0.8 fA/√Hz current noise minimize dark current and noise in transimpedance configurations
  • Battery-Powered Instruments: 500 µA per amplifier and single 3V supply operation extend battery life in portable test equipment
  • Medical Instrumentation: High input impedance and low noise suit ECG/EEG front-end amplifiers with high-impedance electrodes
  • High-Impedance Sensors: 10^13 Ω input impedance prevents loading of pH probes, piezoelectric sensors, and other high-Z sources
  • Single-Supply Filters: Rail-to-rail output maintains full dynamic range in multi-stage active filter designs
Model Manufacturer Key Difference
AD824ARZ-14-3V ADI Guaranteed 3V specifications
TLV274IPWR TI Quad RRIO, 3MHz, CMOS input, lower cost
OPA4134UA TI Quad FET-input, 8MHz, audio grade
MCP6004-I/P Microchip Quad RRIO, 1MHz, 100µA, very low power
LMC660CM TI Quad CMOS RRIO, 1.5MHz, low Ib
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Email: info@materialparts.com

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Service & Packaging

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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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