Analog Devices Inc. AD8222ACPZ-WP

Overview

AD8222ACPZ-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 serves as the front-end signal conditioner for low-level sensor outputs in multichannel medical and industrial data acquisition systems.

For engineers reviewing the AD8222ACPZ-WP datasheet, AD8222ACPZ-WP pinout, AD8222ACPZ-WP application, or AD8222ACPZ-WP equivalent, this page provides verified specifications, dual-channel pin mapping, differential output configuration support, and validated alternatives for ECG, bridge sensor, and high-resolution ADC drive use cases.

Technical Context

The AD8222ACPZ-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 stable gain accuracy and low drift.

It supports both single-ended and differential output modes via dedicated OUT1/OUT2 pins and configurable REF1/REF2 terminals. Gain is set per channel by an external resistor (RG), with G = 1 + 49.4 kΩ/RG, covering 1 to 10,000 while maintaining ≥120 dB CMRR up to 100 Hz at G = 100.

Key Specifications

Pinout & Package

AD8222ACPZ-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 for thermal and electrical stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8222ACPZ-WP, AD8422ARMZ offers superior noise but requires duplication for dual-channel needs, while INA128UA trades performance for package familiarity-neither matches the AD8222ACPZ-WP's combination of dual-channel density, differential output capability, and B-grade precision in LFCSP.

Availability

AD8222ACPZ-WP is available at Aetrix Electronics and suitable for ECG monitoring systems, industrial process controllers, Wheatstone bridge sensor interfaces, and remote sensor signal conditioning requiring stable component supply and long-term manufacturability.

Supply support for AD8222ACPZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD8222ACPZ-WP belongs to Analog Devices' precision instrumentation amplifier product line, engineered specifically for high-fidelity, low-drift signal conditioning in medical, industrial, and test equipment where dual-channel integration and noise immunity are critical.

FAQ

What is the maximum gain achievable with AD8222ACPZ-WP, and how is it set?

The AD8222ACPZ-WP supports gains from 1 to 10,000, set independently per channel using an external resistor (RG) connected between pins 2–3 (RG1) or 10–11 (RG2). The gain equation is G = 1 + 49.4 kΩ/RG. For G = 10,000, RG = 4.94 Ω is required; standard 1% resistor values from Table 8 in the datasheet enable precise, repeatable gain selection without trimming. The AD8222ACPZ-WP defaults to G = 1 if RG is omitted.

Does AD8222ACPZ-WP support differential output, and how is it configured?

Yes, AD8222ACPZ-WP can be configured as a single-channel differential output instrumentation amplifier using OUT1 and OUT2 as complementary outputs, with REF1 and REF2 tied together to set common-mode voltage. This configuration is explicitly supported in the datasheet (Figure 50) and provides high noise immunity for driving differential-input ADCs or transmitting over noisy cables. Channel 2's inputs (±IN2) remain unused in this mode.

What is the operating temperature range for AD8222ACPZ-WP, and how does offset drift behave across it?

The AD8222ACPZ-WP is fully specified from −40°C to +85°C (industrial range), with operational capability up to +125°C. For the B grade, input offset drift is guaranteed ≤0.3 µV/°C over temperature, resulting in ≤80 µV total offset variation across the full −40°C to +85°C range. This low drift ensures stable baseline performance in unregulated enclosures or outdoor industrial deployments.

Can AD8222ACPZ-WP drive a 16-bit SAR ADC directly, and what output swing can be expected?

Yes, AD8222ACPZ-WP can directly drive 16-bit SAR ADCs with its rail-to-rail compatible output swing. At ±15 V supplies and RL = 10 kΩ, output swing is −13.8 V to +13.6 V (i.e., within 1.2–1.4 V of rails). With proper REF1/REF2 biasing, the output common-mode can be centered at mid-supply (e.g., 0 V for ±15 V), matching typical differential ADC input ranges. Settling time to 0.001% is 13 µs at G = 100, well within acquisition windows of modern SAR converters.

How does the LFCSP package of AD8222ACPZ-WP differ between CP-16-19 and CP-16-26 variants?

The AD8222ACPZ-WP uses the CP-16-19 LFCSP variant-4 mm × 4 mm, no thermal pad-optimized for maximum routing density under the device. Unlike CP-16-26 (which includes a thermal pad connected to −VS), CP-16-19 allows vias and traces beneath the IC, preserving PCB real estate. The exposed metal at corners is internally tied to −VS; vias must avoid these areas to prevent shorts. Thermal resistance θJA is 86°C/W (JEDEC 4-layer board), sufficient given the device's 2.2 mA total quiescent current.