Analog Devices Inc. AD8222BCPZ-WP

Overview

AD8222BCPZ-WP from Analog Devices is a dual-channel, precision instrumentation amplifier in a 4 mm × 4 mm LFCSP package, delivering 126 dB minimum CMRR at G = 100, 8 nV/√Hz input voltage noise at 1 kHz, and 60 µV max input offset voltage (B grade). It supports ±2.3 V to ±18 V dual supplies, operates across −40°C to +85°C, and is used in multichannel ECG systems for high-fidelity biopotential signal conditioning.

For engineers reviewing the AD8222BCPZ-WP datasheet, AD8222BCPZ-WP pinout, AD8222BCPZ-WP application, or AD8222BCPZ-WP equivalent, key selection criteria include guaranteed CMRR over frequency (≥80 dB to 4 kHz at G = 1), low 0.25 µV p-p 0.1 Hz–10 Hz RTI noise, dual-channel density advantage, and differential output capability for driving remote sensors or differential-input ADCs.

Technical Context

The AD8222BCPZ-WP implements a classic 3-op-amp architecture with current-feedback input stages, enabling gain-bandwidth product increase with gain-unlike voltage-feedback amplifiers. Each channel uses matched transistor pairs (Q1/Q2) and precision resistors (R1/R2 = 24.7 kΩ) to achieve accurate gain scaling via external RG resistor (G = 1 + 49.4 kΩ/RG).

Its reference terminals (REF1/REF2) are internally connected through 10 kΩ resistors, requiring ≤1 Ω source impedance for optimal CMRR; improper drive introduces asymmetric gain and degrades common-mode rejection. The device maintains ≥80 dB CMRR up to 4 kHz at G = 1 and exhibits only 0.07 µV/V/°C CMRR drift over temperature.

Key Specifications

Pinout & Package

AD8222BCPZ-WP is housed in a 16-lead LFCSP (CP-16-19) package without thermal pad, measuring 4 mm × 4 mm × 0.85 mm. The exposed pad is internally connected to −VS and must be soldered to the PCB ground plane or −VS net per Analog Devices' layout guidance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8222BCPZ-WP, AD8422ARMZ offers identical packaging and grade-matched specs but doubles PCB area for dual-channel use, while INA128UA trades density and differential capability for broader distributor availability and simpler layout - making AD8222BCPZ-WP optimal for compact, multichannel, noise-sensitive medical and industrial DAQ.

Availability

AD8222BCPZ-WP is available at Aetrix Electronics and suitable for ECG monitoring systems, industrial process controllers, and Wheatstone bridge sensor interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AD8222BCPZ-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 semiconductors, headquartered in Norwood, MA, with decades of expertise in precision signal conditioning.

The AD8222BCPZ-WP belongs to Analog Devices' precision instrumentation amplifier product line, engineered specifically for multichannel, low-noise, high-CMRR applications in medical diagnostics and industrial sensing where channel density and dc accuracy are critical.

FAQ

What is the maximum operating temperature range for the AD8222BCPZ-WP?

The AD8222BCPZ-WP is fully specified over the industrial temperature range of −40°C to +85°C. Its operational range extends to +125°C, though parametric performance (e.g., offset drift, CMRR) is not guaranteed beyond +85°C. For reliable long-term operation in harsh environments, thermal design should maintain junction temperature below 125°C, especially under ±18 V supply conditions.

Can the AD8222BCPZ-WP be configured for differential output, and how is it implemented?

Yes, the AD8222BCPZ-WP can be configured as a single-channel differential output instrumentation amplifier using its internal topology - one channel drives OUT1, the other drives OUT2 with inverted polarity. This requires connecting REF1 and REF2 to the same potential and configuring gain resistors identically. The resulting balanced output improves noise immunity for remote sensor links or differential ADC interfaces without external components.

What is the purpose of the RG1 and RG2 pins on the AD8222BCPZ-WP?

The RG1 and RG2 pins on the AD8222BCPZ-WP are dedicated gain-setting terminals for each of the two independent instrumentation amplifier channels. A single external resistor placed between each RG pair (RG1 pins 2 & 3; RG2 pins 10 & 11) sets the gain according to G = 1 + 49.4 kΩ/RG. No resistor yields G = 1; standard 1% values enable precise gains from 1 to 10,000 with predictable error contribution.

How does the AD8222BCPZ-WP handle common-mode voltage rejection at high frequencies?

The AD8222BCPZ-WP maintains ≥80 dB CMRR up to 4 kHz at G = 1, and ≥100 dB at 100 Hz across all gain settings. This high-frequency CMRR is achieved through matched internal resistor networks and optimized 3-op-amp architecture. At G = 100, CMRR remains ≥100 dB up to 100 Hz and ≥80 dB at 1 kHz - enabling robust rejection of 50/60 Hz line interference and switching noise without external filtering.

Is the AD8222BCPZ-WP RoHS compliant and lead-free?

Yes, the AD8222BCPZ-WP is fully RoHS compliant and lead-free, as confirmed in the official Analog Devices datasheet Rev. B. The "WP" suffix denotes a lead-free, RoHS-compliant variant in the CP-16-19 LFCSP package. It meets JEDEC J-STD-020 moisture sensitivity level 3 and is qualified for reflow soldering per industry-standard profiles.