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AD8628ARTZ-REEL7

Zero-Drift Auto-Zero Op-Amp, 1uV Vos, 2.5MHz GBW, RRIO, SOT-23-5

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Manufacturer Part：

AD8628ARTZ-REEL7

Package：

SOT-23-5 (2.9 x 1.6 x 1.1 mm)

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Description

Product Overview

The AD8628ARTZ-REEL7 from Analog Devices is a precision zero-drift auto-zero rail-to-rail output operational amplifier with ultralow offset voltage of 1 µV (typical), zero drift over time and temperature, and rail-to-rail output swing. It operates from 2.7 V to 5.5 V single supply in a SOT-23-5 package.

Key Specifications

Type Zero-Drift Auto-Zero Op-Amp
Channels 1 (AD8628)
Supply Voltage 2.7 V to 5.5 V
Input Offset Voltage 1 µV (typical), 5 µV (max)
Offset Voltage Drift 0.002 µV/°C (typical)
Input Bias Current 30 pA (typical)
Gain-Bandwidth Product 2.5 MHz
Slew Rate 1 V/µs
Voltage Noise (0.1-10 Hz) 0.5 µV p-p
Supply Current 850 µA (typical)
Output Swing Rail-to-Rail (within 5 mV)
Package SOT-23-5
Operating Temperature -40°C to 125°C

Features

  • Auto-zero technique provides ultralow offset voltage: 1 µV typical
  • Zero drift over time and temperature: 0.002 µV/°C
  • Rail-to-rail output swing within 5 mV of rails

Applications

  • Precision instrumentation and measurement
  • Thermocouple and RTD amplifiers
  • Medical instrumentation
  • Current sensing with shunt resistors
  • High-precision filters and integrators

The AD8628ARTZ-REEL7 from Analog Devices is a single-channel precision zero-drift operational amplifier using auto-zero technology to achieve ultralow input offset voltage of 1 µV (typical) with zero drift over time and temperature. The device operates from 2.7 V to 5.5 V single supply and features rail-to-rail output swing within 5 mV of the rails. The low 0.5 µV p-p voltage noise in the 0.1 to 10 Hz band makes it ideal for precision DC and low-frequency applications. The SOT-23-5 package enables compact PCB layouts in space-constrained designs. Dual (AD8629) and quad (AD8630) versions are also available.

The AD8628ARTZ-REEL7 uses Analog Devices’ proprietary auto-zero (chopper-stabilized) technique to continuously correct the input offset voltage. The amplifier contains two signal paths: a main amplifier for signal processing and a nulling amplifier that continuously measures and corrects the main amplifier’s offset. This auto-zeroing occurs at a high frequency (several kHz), effectively eliminating offset drift over temperature and time. The input stage uses MOSFETs to achieve very low input bias current (30 pA typical), making it suitable for high-impedance sensor interfaces. The output stage is rail-to-rail CMOS, swinging within 5 mV of either supply rail under light loads.

Pin Name Type Function
1 VIN- Input Inverting input
2 V- Power Negative supply / ground
3 VIN+ Input Non-inverting input
4 VOUT Output Amplifier output
5 V+ Power Positive supply
  • Thermocouple and RTD temperature measurement front-ends
  • Precision current sensing with low-value shunt resistors
  • Medical instrumentation and biopotential amplifiers
  • High-accuracy integrators and sample-and-hold circuits
  • Industrial process control with sensor signal conditioning
Manufacturer Part Number Package Notes
Analog Devices AD8629ARTZ-REEL7 SOT-23-5 Dual channel version
Texas Instruments OPA333AIDBVR SOT-23-5 Zero-drift, 1.8V, 350nA IQ
Microchip MCP6V01T-E/SN SOIC-8 Auto-zeroed, 250kHz GBW
STMicroelectronics TSZ121ICT SOT-23-5 Zero-drift, RRIO
onsemi NCS333ASN2T1G SOT-23-5 Zero-drift, low power
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