Analog Devices Inc. AD8220BRMZ-R7

Overview

AD8220BRMZ-R7 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 - enabling high-precision signal conditioning in medical ECG front-ends and low-power transducer interfaces.

For engineers reviewing the AD8220BRMZ-R7 datasheet, AD8220BRMZ-R7 pinout, AD8220BRMZ-R7 application, or AD8220BRMZ-R7 equivalent, key selection criteria include its single-resistor programmable gain (G = 1 to 1000), operation on +4.5 V to +36 V single supply or ±2.25 V to ±18 V dual supply, and −40°C to +85°C industrial temperature range with B-grade specifications.

Technical Context

The AD8220BRMZ-R7 implements a three-op-amp instrumentation topology with JFET inputs to achieve ultra-low input bias current and high common-mode rejection across frequency. Its gain-setting architecture uses a single external resistor between Pins 2 and 3, directly determining closed-loop gain via G = 1 + (49.4 kΩ/R_G).

It features a rail-to-rail output stage optimized for dynamic range on low-voltage supplies, reference pin (Pin 6) for precise output level-shifting, and input voltage range extending 0.1 V below the negative supply rail - critical for interfacing with grounded-sensor bridges and single-supply ADCs.

Key Specifications

Pinout & Package

AD8220BRMZ-R7 is housed in an 8-lead MSOP (Mini Small Outline Package) measuring 3.0 mm × 3.0 mm × 1.1 mm, with exposed pad for thermal performance and RoHS-compliant matte tin lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8421ARMZ and INA128UA, AD8220BRMZ-R7 uniquely combines JFET-input low bias current, rail-to-rail output, single-supply operation down to +4.5 V, and MSOP packaging - making it the preferred choice for space-constrained, battery-operated precision measurement systems requiring minimal external components.

Availability

AD8220BRMZ-R7 is available at Aetrix Electronics and suitable for medical instrumentation, precision data acquisition, and transducer interface applications requiring stable component supply, long-term lifecycle support, and guaranteed B-grade parametric compliance.

Supply support for AD8220BRMZ-R7 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 Wilmington, MA.

The AD8220BRMZ-R7 belongs to Analog Devices' precision instrumentation amplifier product line, engineered specifically for low-power, high-accuracy signal conditioning in portable and industrial measurement systems where input bias current, CMRR, and supply flexibility are critical.

FAQ

What is the maximum gain achievable with AD8220BRMZ-R7?

The AD8220BRMZ-R7 supports a gain range of 1 to 1000, set by a single external resistor connected between Pins 2 and 3 using the formula G = 1 + (49.4 kΩ/R_G). At G = 1000, the small-signal bandwidth reduces to 14 kHz, while CMRR remains ≥92 dB. This gain scalability allows the AD8220BRMZ-R7 to adapt to diverse sensor output levels without redesigning the signal chain.

Does AD8220BRMZ-R7 support single-supply operation?

Yes, AD8220BRMZ-R7 operates from a single +4.5 V to +36 V supply, with rail-to-rail output swing and input common-mode range extending 0.1 V below the negative rail. When powered from +5 V, its output swings from 0.15 V to 4.85 V (RL = 10 kΩ), enabling direct interfacing with 3.3 V or 5 V ADCs without level-shifting circuitry - a key advantage over many legacy instrumentation amplifiers.

What is the purpose of the REF pin on AD8220BRMZ-R7?

The REF pin (Pin 6) on AD8220BRMZ-R7 provides a dedicated reference input to level-shift the output voltage. Driven by a low-impedance source (e.g., DAC or filtered voltage), it adds a precise DC offset to VOUT, allowing alignment with ADC input ranges such as 0.5 V to 4.5 V. This eliminates the need for external summing amplifiers and improves accuracy in systems requiring programmable zero-point calibration.

How does AD8220BRMZ-R7 handle ESD protection?

AD8220BRMZ-R7 incorporates on-chip ESD protection rated at 4 kV per Human Body Model (HBM), as verified in its absolute maximum ratings table. This allows safe handling during assembly and operation in environments prone to electrostatic discharge, reducing or eliminating the need for external TVS diodes in many industrial and portable applications - simplifying layout and lowering system cost.

Is AD8220BRMZ-R7 pin-compatible with other Analog Devices instrumentation amplifiers?

No, AD8220BRMZ-R7 has a unique 8-lead MSOP pinout optimized for its JFET-input architecture and gain-setting method (RG pins at 2 and 3). It is not pin-compatible with AD8421, AD8221, or INA128. Layout migration requires PCB revision; however, its functional capabilities - especially single-supply rail-to-rail operation and ultra-low bias current - make it a distinct solution rather than a drop-in replacement.