Analog Devices Inc. AD620ARZ-REEL7

Overview

AD620ARZ-REEL7 from Analog Devices is a low-cost, precision instrumentation amplifier with gain programmable from 1 to 10,000 via a single external resistor. It delivers 50 μV max input offset voltage, 0.6 μV/°C max offset drift, and 9 nV/√Hz input voltage noise at 1 kHz - enabling high-accuracy signal conditioning in bridge-based sensor interfaces and medical front-ends. Its 8-lead SOIC package and 1.3 mA max supply current support compact, battery-powered ECG and weigh scale designs.

For engineers reviewing the AD620ARZ-REEL7 datasheet, AD620ARZ-REEL7 pinout, AD620ARZ-REEL7 application, or AD620ARZ-REEL7 equivalent, key selection criteria include its guaranteed 100 dB min CMRR at G = 10, 120 kHz bandwidth at G = 100, 15 μs settling time to 0.01%, ±2.3 V to ±18 V dual-supply operation, and SOIC-8 thermal performance (θJA = 155°C/W).

Technical Context

The AD620ARZ-REEL7 implements a monolithic, three-op-amp-derived architecture with Superβeta bipolar input transistors, enabling 1.0 nA max input bias current and low input current noise (100 fA/√Hz). Its gain-setting node (Pins 1 and 8) controls transconductance scaling, directly linking RG value to bandwidth optimization and open-loop gain enhancement.

Internal laser-trimmed 24.7 kΩ gain resistors ensure accurate gain programming (G = 1 + 49.4 kΩ/RG), while the REF pin provides precise output level shifting. The device features integrated ESD protection diodes and operates across −40°C to +85°C with guaranteed DC performance including 40 ppm max nonlinearity and 100 dB min CMRR at G = 10.

Key Specifications

Pinout & Package

AD620ARZ-REEL7 is housed in an 8-lead SOIC (R) package per Figure 1, with standard JEDEC MS-012AC dimensions (4.9 mm × 3.9 mm × 1.75 mm), moisture sensitivity level MSL-1, and Pb-free RoHS-compliant finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD620ARZ-REEL7, AD8221ARMZ offers superior DC accuracy but lacks REF pin flexibility and requires PCB redesign, while AD8226ARMZ trades noise and CMRR for ultra-low power and single-supply robustness - making AD620ARZ-REEL7 the balanced choice for cost-sensitive, dual-supply medical and industrial instrumentation.

Availability

AD620ARZ-REEL7 is available at Aetrix Electronics and suitable for weigh scales, ECG monitors, transducer interface modules, and portable data acquisition systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AD620ARZ-REEL7 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 AD620 product line was designed specifically for precision, low-power instrumentation amplifier applications - targeting medical diagnostics, industrial process control, and sensor signal conditioning where accuracy, size, and power efficiency are jointly critical.

FAQ

What is the maximum gain achievable with AD620ARZ-REEL7?

The AD620ARZ-REEL7 supports a gain range of 1 to 10,000, set by a single external resistor RG connected between Pins 1 and 8. At G = 10,000, RG = 4.94 Ω (1% tolerance); practical implementation requires careful attention to parasitic resistance and thermal EMF. The AD620ARZ-REEL7 datasheet specifies gain error of 0.70% max at G = 1000 and 0.30% max at G = 100 under typical conditions.

Can AD620ARZ-REEL7 operate from a single 5 V supply?

Yes, AD620ARZ-REEL7 can operate from a single 5 V supply when configured with appropriate reference and input biasing. The datasheet confirms operation down to ±2.3 V dual supply (i.e., 4.6 V total), and Figure 38 demonstrates a functional 5 V single-supply pressure monitor circuit using AD620B. For single-supply use, REF must be biased to mid-rail (2.5 V), and input signals must remain within the specified common-mode range (−VS + 1.9 V to +VS − 1.4 V).

What is the purpose of the REF pin on AD620ARZ-REEL7?

The REF pin on AD620ARZ-REEL7 sets the output DC level relative to the desired system ground or ADC reference. It functions as a unity-gain buffered input to the final difference amplifier stage, allowing precise output offset adjustment without affecting gain or CMRR. In practice, tying REF to mid-supply enables rail-symmetric output swing; connecting it to an external DAC permits programmable output offset calibration - a feature absent in many competing IAs like the AD8226.

How does AD620ARZ-REEL7 compare to discrete three-op-amp instrumentation amplifier designs?

AD620ARZ-REEL7 delivers 10× lower supply current (1.3 mA vs. 15 mA), 60% smaller PCB footprint, and guaranteed matching of internal resistors - eliminating manual trimming. As shown in Figure 2 and Table 4, it reduces total error from 28,134 ppm to 14,663 ppm over −40°C to +85°C in a G = 100 bridge application. Its monolithic construction also ensures superior tracking of gain drift and offset drift versus discrete OP07-based implementations.

Is AD620ARZ-REEL7 suitable for ECG applications?

Yes, AD620ARZ-REEL7 is explicitly validated for ECG monitoring per Figure 39 in the datasheet. Its 1.0 nA max input bias current prevents electrode polarization, 0.28 μV p-p 0.1–10 Hz noise preserves ST-segment morphology, and 15 μs settling time supports multiplexed 12-lead acquisition. Combined with SOIC-8 packaging and low power, AD620ARZ-REEL7 enables compact, battery-operated ECG recorders meeting AAMI EC11 standards for diagnostic fidelity.