Analog Devices Inc. AD22050RZ-REEL7

Overview

AD22050RZ-REEL7 from Analog Devices is a single-supply difference amplifier optimized for high-accuracy amplification and low-pass filtering of small differential signals (e.g., 100 mV FS) in the presence of large common-mode voltages up to +24 V with +5 V supply. It features laser-trimmed 400 kΩ differential input resistance, ±0.5% overall gain accuracy at ×20 default, and integrated RFI filtering. It is used in automotive current sensing where battery-referenced shunt voltages exceed supply rails.

For engineers reviewing the AD22050RZ-REEL7 datasheet, AD22050RZ-REEL7 pinout, AD22050RZ-REEL7 application, or AD22050RZ-REEL7 equivalent, key selection criteria include its –1 V to +24 V input common-mode range, 20 mV to (VS – 0.2) V output swing, 30 kHz –3 dB bandwidth, ±3 mV input offset over temperature, and SOIC-8 package compatibility with industrial motor control and transducer interface designs.

Technical Context

The AD22050RZ-REEL7 integrates a precision resistive attenuator (6× attenuation), a low-drift preamplifier (A1, ×10 closed-loop gain), and an output buffer (A2, ×2 gain), yielding a factory-trimmed ×20 overall gain. Its input stage supports common-mode rejection ≥80 dB at ≤10 Hz and ≥60 dB at 10 kHz, enabled by laser-matched 280–400 kΩ differential input resistance and <±0.5% resistor matching.

It implements configurable low-pass filtering via external capacitors on internal nodes: single-pole (20 dB/decade), two-pole (40 dB/decade), or three-pole (60 dB/decade), with corner frequencies scalable in Hz·µF (e.g., 0.796 Hz·µF for ×40 gain). Midscale offset is achieved by applying a reference voltage to Pin 7 (OFS), scaling output to 0.49–0.51× that reference.

Key Specifications

Pinout & Package

AD22050RZ-REEL7 is supplied in an 8-lead plastic SOIC (SO-8) package, RoHS-compliant and tape-and-reel packaged for automated assembly (2,500 units per reel).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar difference amplifier applications.

Compared with INA128UA and AD8210YRZ, AD22050RZ-REEL7 uniquely combines extended input CMR (–1 V to +24 V on +5 V), user-configurable filtering, and accurate midscale offset-all in a single SOIC-8 package-making it optimal for cost-sensitive, space-constrained transducer interfaces requiring bipolar signal support.

Availability

AD22050RZ-REEL7 is available at Aetrix Electronics and suitable for automotive current sensing, industrial motor control, pressure transducer interfacing, and strain gage signal conditioning requiring stable component supply across extended temperature and voltage ranges.

Supply support for AD22050RZ-REEL7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD22050RZ-REEL7 belongs to Analog Devices' precision sensor interface amplifier product line, designed specifically for robust, single-supply amplification of low-level transducer outputs in electrically noisy, wide-voltage environments.

FAQ

What is the maximum common-mode voltage the AD22050RZ-REEL7 can handle with a +5 V supply?

The AD22050RZ-REEL7 supports an input common-mode voltage range of –1.0 V to +24 V when operated from a +5 V supply. This is achieved via its internal 6× resistive attenuator, enabling direct measurement of signals referenced to battery or chassis potentials exceeding the supply rail-critical for automotive shunt-based current sensing where common-mode spikes reach +21.5 V.

Can the AD22050RZ-REEL7 be used with a single +3.3 V supply for interfacing to a 3.3 V microcontroller ADC?

Yes, the AD22050RZ-REEL7 operates from +3.0 V to +36 V, so +3.3 V is fully supported. With this supply, its output spans 20 mV to ~3.1 V, compatible with most 3.3 V ADCs. To ensure full-scale utilization, tie Pin 7 (OFS) to +3.3 V for midscale offset-enabling bipolar input signals to map cleanly into the 0–3.3 V ADC range without external level-shifting circuitry.

How does the AD22050RZ-REEL7 achieve its specified ±0.5% overall gain accuracy?

The AD22050RZ-REEL7 achieves ±0.5% overall gain accuracy through factory laser trimming of its internal resistive attenuator network and feedback paths. This trim applies to the complete signal chain-including the ×10 preamplifier (A1), 100 kΩ trimmed resistor (R12), and ×2 output buffer (A2)-ensuring the default ×20 gain remains stable across temperature (–40°C to +125°C) and supply variations without requiring external calibration.

Does the AD22050RZ-REEL7 support low-pass filtering, and how is it implemented?

Yes, the AD22050RZ-REEL7 supports 1-, 2-, or 3-pole low-pass filtering using only external capacitors. A single-pole filter is formed by connecting Pin 3 (A1 output) to Pin 4 (A2 input) and adding a capacitor from that node to ground. Two- and three-pole variants use Sallen-Key and passive RC topologies respectively-detailed in Figures 6–9 of the AD22050RZ-REEL7 datasheet-with corner frequencies scalable in Hz·µF (e.g., 0.796 Hz·µF for ×40 gain).

What protection features does the AD22050RZ-REEL7 include for harsh environments?

The AD22050RZ-REEL7 includes reversed supply protection (–34 V), ±60 V peak input tolerance (40 ms), integrated RFI filtering capacitors, and ESD protection rated to 4000 V HBM. These features enable reliable operation in automotive under-hood and industrial motor drive settings where voltage transients, electromagnetic interference, and electrostatic discharge pose routine reliability risks-without requiring external protection components.