Analog Devices Inc. AD8426ACPZ-WP

Overview

AD8426ACPZ-WP from Analog Devices is a dual-channel, rail-to-rail output instrumentation amplifier with gain set by a single external resistor (1 to 1000), 1 MHz bandwidth at G = 1, 80 dB minimum CMRR, and 24 nV/√Hz input voltage noise. It operates from ±1.35 V to ±18 V dual supply or 2.2 V to 36 V single supply, and supports industrial process control and portable data acquisition.

For engineers reviewing the AD8426ACPZ-WP datasheet, AD8426ACPZ-WP pinout, AD8426ACPZ-WP application, or AD8426ACPZ-WP equivalent, key selection criteria include its dual-in-amp LFCSP package, −40°C to +125°C operation, input voltage range extending below negative rail, and robust ±35 V input overvoltage tolerance with ±5 V supplies.

Technical Context

The AD8426ACPZ-WP uses PNP-input architecture enabling input common-mode voltage down to −VS − 0.15 V and rail-to-rail output swing. Its two independent in-amps share no internal coupling, supporting multichannel differential signal conditioning without crosstalk.

Gain is set via external resistors RG1 and RG2 per channel using G = 1 + (49.4 kΩ/RG); reference inputs REF1/REF2 allow level-shifting of each output independently. Input protection handles ±35 V overvoltage relative to rails, and PSRR exceeds 100 dB up to 1 kHz at G = 100.

Key Specifications

Pinout & Package

AD8426ACPZ-WP uses a 4 mm × 4 mm, 16-lead LFCSP package with no exposed metal pad, maximizing PCB routing area and eliminating leakage paths to ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8426ARMZ, AD8426ACPZ-WP offers superior thermal performance and routing headroom; compared with AD8422ACPZ-R7, it delivers true dual-channel independence with per-amplifier reference control-critical for multichannel synchronized acquisition.

Availability

AD8426ACPZ-WP is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, portable data acquisition, and multichannel systems requiring stable component supply and extended temperature operation.

Supply support for AD8426ACPZ-WP 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 technologies, serving industrial, automotive, communications, and healthcare markets.

The AD8426 product line delivers dual-channel, low-power instrumentation amplifiers optimized for space-constrained, high-reliability applications requiring wide supply range and robust input protection.

FAQ

What is the maximum input overvoltage tolerance for AD8426ACPZ-WP?

The AD8426ACPZ-WP withstands voltages up to ±35 V beyond the supply rails - for example, with ±5 V supplies, inputs may safely reach −40 V to +40 V without damage. This is specified across −40°C to +125°C and eliminates need for external clamping diodes in noisy industrial environments. The AD8426ACPZ-WP input stage uses PNP transistors, ensuring predictable current flow into the device during overvoltage events.

Does AD8426ACPZ-WP support single-supply operation with ground-referenced inputs?

Yes, AD8426ACPZ-WP supports true single-supply operation down to 2.2 V and accepts input common-mode voltages as low as −0.15 V below ground (−VS) at room temperature. This enables direct interfacing with ground-referenced sensors such as resistive bridges or thermistors without level-shifting circuitry. The AD8426ACPZ-WP maintains rail-to-rail output swing and 80 dB CMRR even under these conditions.

How is gain configured on AD8426ACPZ-WP, and what resistor values achieve G = 100?

Gain on AD8426ACPZ-WP is set by external resistors connected between RG1/1 and RG1/2 (Channel 1) or RG2/1 and RG2/2 (Channel 2), using G = 1 + (49.4 kΩ / R_G). For G = 100, R_G = 499 Ω (standard 1% value). The AD8426ACPZ-WP's dual RG pins per channel support Kelvin connections to minimize parasitic resistance errors, especially critical at high gains and low signal levels.

What is the purpose of the REF1 and REF2 pins on AD8426ACPZ-WP?

REF1 and REF2 pins set the output DC level for Channel 1 and Channel 2 independently, allowing level-shifting of each amplified signal to match downstream ADC or comparator input ranges. Each REF pin has 100 kΩ input impedance and accepts voltages from −VS to +VS. The AD8426ACPZ-WP provides unity-gain buffered reference-to-output transfer, enabling precision offset adjustment without loading external reference sources.

Is AD8426ACPZ-WP pin-compatible with other dual instrumentation amplifiers in Analog Devices' portfolio?

No, AD8426ACPZ-WP is not pin-compatible with other dual instrumentation amplifiers such as the AD8222 or AD8224. Its 16-lead LFCSP layout - with dual +VS/−VS, dual RG, and separate REF pins - is unique to the AD8426 family. Migration requires PCB redesign. However, the AD8426ACPZ-WP shares functional equivalence with AD8426ARMZ (same electrical specs, different package), making it a drop-in replacement only within the AD8426 series.