Analog Devices Inc. AD8220BRMZ-RL

Overview

AD8220BRMZ-RL from Analog Devices is a JFET-input instrumentation amplifier in an 8-lead MSOP package, delivering rail-to-rail output swing, 10 pA max input bias current (B grade), 100 dB min CMRR at G = 10, and 1.5 MHz bandwidth at unity gain. It operates from 4.5 V to 36 V single supply or ±2.25 V to ±18 V dual supply, serving precision medical instrumentation and transducer interfaces where low input current and high common-mode rejection are critical.

For engineers reviewing the AD8220BRMZ-RL datasheet, AD8220BRMZ-RL pinout, AD8220BRMZ-RL application, or AD8220BRMZ-RL equivalent, this page provides verified specifications, validated pin functions, real-world use scenarios in ECG signal conditioning and bridge sensor readout, and two confirmed alternative parts with documented technical and application differences.

Technical Context

The AD8220BRMZ-RL uses a three-op-amp architecture with JFET inputs to achieve ultra-low input bias current and high input impedance (10⁴ GΩ || 6 pF). Its gain is set externally via a single resistor across RG pins (G = 1 + 49.4 kΩ/RG), enabling precise scaling from 1 to 1000 while maintaining CMRR > 94 dB up to G = 1000.

It features a reference input (REF) for output level-shifting, rail-to-rail output stage compatible with low-voltage supplies (e.g., +5 V), and input voltage range extending 0.1 V below the negative rail - critical for interfacing with grounded-sensor configurations without level-shifting circuitry.

Key Specifications

Pinout & Package

AD8220BRMZ-RL is housed in an 8-lead MSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch), occupying ~50% board area of standard SOIC-8. The exposed pad is not electrically connected and may be left floating or tied to −VS for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8220BRMZ-RL, AD8421ARMZ trades ultra-low input current for speed and noise performance, while INA128UA offers lower cost and similar bias current but sacrifices rail-to-rail operation and flexible reference control - making AD8220BRMZ-RL uniquely suited for modern low-voltage, high-impedance, and space-constrained instrumentation.

Availability

AD8220BRMZ-RL is available at Aetrix Electronics and suitable for medical instrumentation, precision data acquisition, transducer interfaces, and portable diagnostic equipment requiring stable component supply across industrial and automotive temperature ranges.

Supply support for AD8220BRMZ-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 AD8220BRMZ-RL belongs to Analog Devices' precision instrumentation amplifier product line, engineered specifically for low-power, high-accuracy signal conditioning in battery-operated and space-constrained measurement systems.

FAQ

What supply voltage range does the AD8220BRMZ-RL support?

The AD8220BRMZ-RL operates from 4.5 V to 36 V on a single supply or ±2.25 V to ±18 V on dual supplies. This wide range enables direct integration into both low-voltage portable systems (e.g., 5 V battery-powered ECG monitors) and industrial equipment with higher rail voltages. The device maintains specified performance across the full range, including CMRR and bandwidth, without external regulation.

How is gain set on the AD8220BRMZ-RL, and what is the supported range?

Gain on the AD8220BRMZ-RL is set using a single external resistor connected between pins 2 and 3 (RG terminals), following G = 1 + 49.4 kΩ/RG. This supports gains from 1 to 1000 with standard 1% metal-film resistors. Gain error remains within ±0.04% (B grade) at G = 1 and ±0.2% at G = 10, enabling predictable, trim-free scaling for calibrated sensor interfaces.

Does the AD8220BRMZ-RL have rail-to-rail output capability, and how does it behave with different loads?

Yes, the AD8220BRMZ-RL features a rail-to-rail output stage. With a 10 kΩ load, it delivers full swing (e.g., 0.15 V to 4.85 V on +5 V supply); with 2 kΩ, output swing reduces slightly but remains >95% of rails. Performance is characterized across temperature (−40°C to +85°C) and supply variations, ensuring consistent dynamic range in field-deployed equipment.

What is the purpose of the REF pin on the AD8220BRMZ-RL, and how should it be used?

The REF pin on the AD8220BRMZ-RL allows precise DC level-shifting of the output voltage. It accepts a low-impedance voltage source (e.g., ADC reference or DAC output) and adds that voltage directly to the amplified differential signal. This enables bipolar output swing on single supplies and seamless interfacing with unipolar ADCs - eliminating external summing amplifiers in most data acquisition architectures.

Is the AD8220BRMZ-RL suitable for automotive applications, and what qualification does it hold?

The AD8220BRMZ-RL itself is the B-grade industrial version (−40°C to +85°C). However, the AD8220 family includes a W-grade variant (AD8220WARMZ) qualified to AEC-Q100 Grade 1 (−40°C to +125°C) for automotive use. While AD8220BRMZ-RL is commonly used in non-safety-critical automotive subsystems, designers requiring full automotive qualification must specify the W-grade part.