Analog Devices Inc. AD620BRZ-RL

Overview

AD620BRZ-RL from Analog Devices is a low-cost, precision instrumentation amplifier optimized for DC-coupled sensor signal conditioning in battery-powered and industrial systems. It delivers gain of 1–10,000 set by a single external resistor, 50 μV max input offset voltage (B grade), 9 nV/√Hz input voltage noise at 1 kHz, and 1.3 mA max supply current across ±2.3 V to ±18 V supplies - enabling high-accuracy weigh scale and ECG front-end designs.

For engineers reviewing the AD620BRZ-RL datasheet, AD620BRZ-RL pinout, AD620BRZ-RL application, or AD620BRZ-RL equivalent, this page provides verified technical context, real-world performance boundaries, package-specific layout guidance, and validated alternative options for medical, transducer, and portable data acquisition use cases.

Technical Context

The AD620BRZ-RL implements a monolithic, three-op-amp-derived architecture with Superβ bipolar input transistors, enabling 1.0 nA max input bias current and 0.6 μV/°C max input offset drift. Its gain-setting node (Pins 1 & 8) controls transconductance scaling, directly linking RG value to bandwidth (120 kHz at G = 100) and noise reduction.

Internal 24.7 kΩ laser-trimmed resistors ensure 0.15% gain error at G = 100, while the REF pin provides precise output level shifting without degrading CMRR - maintaining ≥110 dB (G = 100) over DC–60 Hz with 1 kΩ source imbalance.

Key Specifications

Pinout & Package

AD620BRZ-RL is supplied in an 8-lead SOIC (R) package (5.0 mm × 6.2 mm, 1.27 mm pitch), RoHS-compliant and tape-and-reel packaged (RL suffix). The package supports standard reflow profiles and offers thermal resistance θ_JA = 155°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8221ARMZ and AD8226ARZ, AD620BRZ-RL uniquely balances ultra-low noise (9 nV/√Hz), industry-standard SOIC-8 packaging, and sub-1.5 mA quiescent current - making it the optimal choice for portable medical devices and cost-sensitive industrial DAQ where layout simplicity and battery life are co-primary constraints.

Availability

AD620BRZ-RL is available at Aetrix Electronics and suitable for weigh scales, ECG monitors, and transducer interface circuits requiring stable component supply, long-term manufacturability, and consistent parametric performance across production lots.

Supply support for AD620BRZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD620BRZ-RL belongs to Analog Devices' precision instrumentation amplifier product line, engineered specifically for low-power, high-accuracy DC signal conditioning in sensor interfaces - emphasizing offset stability, noise performance, and ease of gain configuration.

FAQ

What is the maximum gain achievable with AD620BRZ-RL, and how is it set?

The AD620BRZ-RL supports gains from 1 to 10,000, set by a single external resistor (RG) connected between Pins 1 and 8. For G = 10,000, RG = 4.94 Ω is required; the AD620BRZ-RL datasheet specifies that RG must be ≥10 Ω for stability. Gain accuracy depends on RG tolerance and temperature coefficient - use 0.1% metal-film resistors with TC ≤10 ppm/°C for best results. The AD620BRZ-RL does not require additional compensation components regardless of gain setting.

Can AD620BRZ-RL operate from a single 5 V supply?

Yes, AD620BRZ-RL operates from split supplies (±2.3 V to ±18 V) or single supplies down to 4.6 V total (e.g., +4.6 V and GND), provided input and output voltage ranges remain within specification limits. For 5 V single-supply use, tie −VS to GND, bias +IN/−IN within 1.9 V to 3.8 V (per datasheet Table 2), and drive REF to 2.5 V. Output swings from ~0.8 V to ~4.2 V into 10 kΩ. The AD620BRZ-RL's rail-to-rail output is not supported - verify headroom margins in your specific gain and loading conditions.

How does AD620BRZ-RL handle RF interference in noisy industrial environments?

The AD620BRZ-RL incorporates internal ESD diodes and exhibits strong RF immunity due to its fully differential input architecture and high CMRR (>110 dB up to 60 Hz). Per Analog Devices' application notes, adding 100 Ω series resistors on +IN/−IN lines plus 1 nF capacitors from each input to GND (close to the AD620BRZ-RL pins) suppresses >10 MHz RF without degrading bandwidth. Layout best practices - including ground plane under the AD620BRZ-RL, short input traces, and shielded cables - further enhance robustness in motor-drive or PLC environments.

What is the recommended PCB layout for optimal AD620BRZ-RL performance?

For optimal AD620BRZ-RL performance, place 0.1 μF ceramic decoupling capacitors ≤5 mm from +VS (Pin 7) and −VS (Pin 4), use a solid ground plane beneath the SOIC-8 footprint, route +IN/−IN traces as matched-length differential pair with guard ring tied to REF, and keep RG traces short and away from noisy nodes. Avoid routing digital traces under or adjacent to the AD620BRZ-RL. Thermal relief on +VS/−VS pads improves solder joint reliability. These practices minimize offset drift, noise coupling, and CMRR degradation in production-grade AD620BRZ-RL layouts.

Does AD620BRZ-RL require external compensation or filtering for stability?

No, AD620BRZ-RL is internally compensated and remains stable across its full gain range (1–10,000) and supply voltages (±2.3 V to ±18 V) without external components. However, capacitive loading >100 pF on the OUTPUT pin (Pin 6) may cause peaking or oscillation - add a 10–50 Ω series resistor between OUTPUT and load if driving coaxial cable or high-capacitance ADC inputs. The AD620BRZ-RL's REF pin must be driven from a low-impedance source (<20 kΩ) to prevent gain error; buffer with an op amp if sourcing from a voltage divider.