Analog Devices Inc. AD22050NZ

Overview

AD22050NZ from Analog Devices is a single-supply difference amplifier designed 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 resistive attenuator input, default ×20 gain, 30 kHz bandwidth, and midscale offset capability via Pin 7. Used in automotive current sensing where supply headroom is constrained and CMR exceeds rail voltage.

For engineers reviewing the AD22050NZ datasheet, AD22050NZ pinout, AD22050NZ application, or AD22050NZ equivalent, key selection criteria include guaranteed ±0.5% overall gain accuracy, –40°C to +125°C operation, input CMR from –1 V to +24 V, differential input resistance of 400 kΩ, and support for 1-/2-/3-pole configurable low-pass filtering without external active components.

Technical Context

The AD22050NZ integrates a precision balanced resistive attenuator (Pins 1/8), low-drift preamplifier A1 (×10 closed-loop gain, output at Pin 3), and output buffer A2 (×2 gain, output at Pin 5). Its input attenuator extends common-mode range to 6×(VS – 1 V), enabling operation with CMV > VS - critical for shunt-based current sensing in battery-fed systems.

Internal 100 kΩ trimmed resistor (R12) between Pins 3 and 4 enables passive low-pass filtering; midscale offset is implemented by biasing Pin 7 to +VS/2, shifting output DC level to mid-supply for bipolar signal conditioning into single-supply ADCs. No external op amps or precision references are required for basic operation.

Key Specifications

Pinout & Package

AD22050NZ is supplied in an 8-pin plastic DIP (N-8) package with 0.3-inch width and through-hole mounting. Pin spacing is 0.1 inch; lead finish is matte tin.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA128UA and AD8210YRZ, AD22050NZ uniquely combines wide input CMR (–1 V to +24 V), midscale offset, and user-configurable low-pass filtering in a single IC - making it the only option that supports both automotive current sensing and industrial bridge transducer interfaces without design compromises.

Availability

AD22050NZ is available at Aetrix Electronics and suitable for automotive current sensing, industrial load cell interfaces, BLDC motor phase feedback, and HVAC pressure transducer signal conditioning requiring stable component supply across extended temperature and long product lifecycles.

Supply support for AD22050NZ 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, headquartered in Wilmington, MA.

The AD22050NZ belongs to Analog Devices' precision sensor interface amplifier product line, engineered specifically for single-supply amplification of low-level transducer outputs in harsh environments with large common-mode voltages.

FAQ

What is the maximum common-mode voltage the AD22050NZ can handle with a +5 V supply?

The AD22050NZ supports an input common-mode range from –1 V to +24 V when operated from a +5 V supply. This is achieved via its internal 6:1 resistive attenuator, allowing it to safely condition signals from shunt resistors in automotive battery systems where transient spikes exceed the supply rail. The specification is guaranteed over the full –40°C to +125°C temperature range per the AD22050NZ datasheet Rev. C.

Can the AD22050NZ be used with a 3.3 V supply, and what is its minimum operating voltage?

Yes, the AD22050NZ operates from +3.0 V to +36 V, so +3.3 V is fully supported. At +3.3 V, the output voltage range is +0.02 V to +3.1 V, and the input CMR adjusts proportionally to –1 V to +14.4 V. Quiescent current remains ≤500 µA, making it viable for low-power IoT sensor nodes. All specifications including gain accuracy and CMRR are guaranteed down to the 3.0 V minimum supply voltage.

How does the midscale offset feature work on the AD22050NZ, and what is its accuracy?

The AD22050NZ midscale offset is controlled by Pin 7 (OFS): applying +VS to this pin centers the output at +VS/2. The internal ratio is trimmed to 0.50 ±0.01 V/V, yielding ±2% accuracy over temperature. This allows bipolar bridge outputs (e.g., ±10 mV) to be amplified to ±1 V around +2.5 V with +5 V supply - eliminating external op amps. Accuracy is independent of gain-setting resistors unless gain is reduced via Pin 4-to-ground connection.

Does the AD22050NZ require external components to achieve its default ×20 gain?

No, the AD22050NZ delivers its calibrated ×20 overall gain with no external components - the preamplifier A1 provides ×10 gain and buffer A2 contributes ×2, both internally trimmed. External resistors are only needed to alter gain (e.g., increase to ×40 or reduce to ×10) or add low-pass filtering. The default configuration uses only power supply decoupling capacitors and optional output load.

What packaging and temperature rating does the AD22050NZ have?

The AD22050NZ is packaged in an 8-pin plastic DIP (N-8) with matte tin leads and is rated for operation from –40°C to +125°C. This matches the industrial and automotive-grade qualification of the AD22050 family. The N-8 package supports through-hole assembly and offers robust thermal performance for high-reliability applications such as engine control units and industrial PLC I/O modules.