Analog Devices Inc. AD22057R

Overview

AD22057R from Analog Devices is a single-supply, precision difference amplifier optimized for high-common-mode-voltage sensor signal conditioning. It delivers 20× default gain (±0.5%), 80–90 dB CMRR at DC–1 kHz, input common-mode range from –1 V to +24 V with +5 V supply, and drives 10 kΩ loads to within 20 mV of ground. It is used in automotive current sensing where shunt voltages up to 100 mV must be amplified amid battery-referenced transients exceeding 20 V.

For engineers reviewing the AD22057R datasheet, AD22057R pinout, AD22057R application, or AD22057R equivalent, key selection considerations include its laser-trimmed 400 kΩ differential input resistance, ±1 mV max input offset voltage, midscale offset capability via Pin 7, integrated RFI filtering, and support for 1-/2-/3-pole low-pass configurations without external op amps.

Technical Context

The AD22057R integrates a precision resistive attenuator (laser-trimmed for <±0.5% matching), a low-drift preamplifier (A1) with ×10 closed-loop gain, and an output buffer (A2) with ×2 gain - yielding calibrated 20× overall gain. Its input stage tolerates common-mode voltages up to 6×(VS – 1 V), enabling operation with +5 V supply while accepting +24 V inputs.

Internal 5 pF RF filters at A1 inputs suppress rectification-induced DC errors; the 100 kΩ trimmed resistor between Pins 3 and 4 enables passive low-pass filtering; and the OFS pin (Pin 7) provides accurate 0.5× scaling of an external reference to set output mid-rail - critical for bipolar bridge signals interfaced to single-supply ADCs.

Key Specifications

Pinout & Package

AD22057R is housed in an 8-lead SOIC (R-8) package with standard JEDEC MS-012AC footprint (5.0 mm × 6.2 mm, 1.27 mm pitch). Thermal pad not present; RoHS-compliant matte tin lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA149IDR and AD8479ARZ, the AD22057R uniquely combines laser-trimmed gain accuracy, user-configurable low-pass filtering, and hardware-supported midscale offset - making it optimal for cost-sensitive, space-constrained automotive and industrial sensor nodes requiring single-supply operation.

Availability

AD22057R is available at Aetrix Electronics and suitable for automotive current sensing, motor phase feedback, strain gage interfaces, and accelerometer signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD22057R 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 AD22057R belongs to Analog Devices' precision sensor interface amplifier product line, engineered specifically for single-supply, high-common-mode-voltage signal conditioning in harsh environments such as engine compartments and factory floors.

FAQ

What is the maximum common-mode voltage the AD22057R can handle with a +5 V supply?

The AD22057R supports an input common-mode voltage range from –1 V to +24 V when operated from a +5 V supply. This is achieved via its internal 6× resistive attenuator, which extends the effective input CMR beyond the supply rail - enabling direct measurement of shunt voltages in automotive 12 V systems even during load-dump transients.

Can the AD22057R drive a 1 kΩ load to full scale with +5 V supply?

Yes, the AD22057R can drive a 1 kΩ load to +4.8 V output with +5 V supply, as specified in its datasheet. Its output buffer delivers 11 mA short-circuit current and maintains linearity down to 20 mV above ground - ensuring compatibility with low-impedance ADC inputs and active filters without external buffering.

How does the OFS (Pin 7) pin function in the AD22057R?

The OFS pin on the AD22057R accepts an external voltage (0–20 V) and scales the output to precisely 0.49–0.51× that voltage - establishing a midscale reference. When tied to +5 V, the output centers at +2.5 V, enabling bipolar bridge signals (e.g., ±10 mV strain gage outputs) to be fully conditioned for single-supply ADCs without external op amps or level shifters.

Does the AD22057R require external compensation for stability?

The AD22057R is unity-gain stable and requires no external compensation when driving ≤25 pF capacitive loads with ≤5 V supply. For higher supply voltages (>5 V) or larger capacitive loads (e.g., ADC sample capacitors), a series R-C "snubber" (e.g., 200 Ω + 0.047 µF) between OUT and load is recommended to prevent peaking and ensure monotonic step response.

What is the gain adjustment range supported by the AD22057R?

The AD22057R supports user-configurable gain from ×31 to ×3160 using external resistors. Default gain is ×20 (±0.5%). Lower gains (e.g., ×10) are achieved with a resistor from Pin 4 to ground; higher gains (e.g., ×40, ×100) use feedback from Pin 5 to Pin 4. Gain trim networks preserve midscale offset accuracy only when increasing gain - decreasing gain degrades OFS performance.