Analog Devices Inc. AD8222ACPZ-RL

Overview

AD8222ACPZ-RL 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 operates from ±2.3 V to ±18 V supplies, draws ≤2.2 mA total quiescent current, and targets high-accuracy sensor signal conditioning in multichannel medical and industrial systems.

For engineers reviewing the AD8222ACPZ-RL datasheet, AD8222ACPZ-RL pinout, AD8222ACPZ-RL application, or AD8222ACPZ-RL equivalent, key selection criteria include guaranteed CMRR over frequency (≥80 dB to 4 kHz), RTI noise performance (0.25 µV p-p, 0.1 Hz–10 Hz), gain-setting resistor flexibility (G = 1 to 10,000), differential output capability, and industrial temperature range (−40°C to +85°C).

Technical Context

The AD8222ACPZ-RL implements a classic 3-op-amp architecture with input transistors biased at fixed current, enabling gain-bandwidth product increase with gain-unlike voltage-feedback amplifiers. Its transfer function is VOUT = G(V+IN − V−IN) + VREF, where G = 1 + 49.4 kΩ/RG.

Each channel features independent reference inputs (REF1/REF2) for output level-shifting, adjustable common-mode output, and ESD-protected reference terminals rated ±VS ±0.3 V. The device supports both single-ended and differential output configurations, with differential mode providing enhanced noise immunity for remote sensor interfaces and ADC driving.

Key Specifications

Pinout & Package

The AD8222ACPZ-RL 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 connected internally to −VS and must be soldered to the PCB ground plane or −VS net per layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8221ARMZ-R7 and INA128UA, the AD8222ACPZ-RL uniquely delivers dual-channel precision in a compact LFCSP with differential output capability and adjustable reference-making it optimal for high-density, noise-immune, multichannel sensor systems where size, accuracy, and EMI resilience are co-prioritized.

Availability

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

Supply support for AD8222ACPZ-RL 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-RL belongs to Analog Devices' precision instrumentation amplifier product line, engineered specifically for high-fidelity, low-drift amplification of weak differential signals in medical, industrial, and test equipment.

FAQ

What is the maximum gain achievable with the AD8222ACPZ-RL?

The AD8222ACPZ-RL supports gains from 1 to 10,000, set by an external resistor RG using the formula G = 1 + 49.4 kΩ/RG. For G = 10,000, RG = 4.94 Ω is required; however, practical implementation demands precision, low-tempco resistors and careful layout to preserve accuracy. The AD8222ACPZ-RL maintains ≥130 dB CMRR even at G = 1000, confirming high-gain integrity.

Does the AD8222ACPZ-RL support differential output configuration?

Yes, the AD8222ACPZ-RL can be configured for differential output by connecting OUT1 and OUT2 to opposite inputs of a difference amplifier or directly to a differential-input ADC. The REF1 and REF2 pins allow independent common-mode control of each output, enabling true balanced signaling. This mode is explicitly characterized in Table 4 and Figure 43 of the datasheet.

What is the purpose of the exposed pad on the AD8222ACPZ-RL package?

The exposed pad on the AD8222ACPZ-RL (CP-16-19 variant) is internally connected to −VS and must be soldered to the PCB's −VS net or ground plane. It serves as a low-inductance return path and thermal conduction path-not as a thermal heatsink, since power dissipation is low (<100 mW). Incorrect floating or AC-coupled connection degrades PSRR and introduces instability.

How does the AD8222ACPZ-RL handle common-mode voltage beyond the supply rails?

The AD8222ACPZ-RL specifies absolute maximum common-mode input voltage as ±VS, with operational common-mode range of −VS + 1.9 V to +VS − 1.2 V (at ±5 V to ±18 V supplies). Inputs exceeding these limits risk phase reversal or latch-up. External clamping diodes or series resistors are required for overvoltage protection beyond datasheet limits-no internal protection exists beyond ESD structures.

Is the AD8222ACPZ-RL RoHS compliant and qualified for industrial temperature operation?

Yes, the AD8222ACPZ-RL is fully RoHS compliant and specified for industrial temperature operation from −40°C to +85°C. Performance parameters-including input offset, CMRR, and gain error-are guaranteed across this range. Extended operation up to +125°C is possible but not production-tested; parametric shifts may occur outside the specified range.