Analog Devices Inc. AD8226BRZ-R7

Overview

AD8226BRZ-R7 from Analog Devices is a rail-to-rail output instrumentation amplifier with gain set by a single external resistor (1–1000), wide supply range (±1.35 V to ±18 V or 2.2 V to 36 V), −40°C to +125°C operation, and 22 nV/√Hz input voltage noise - used in precision bridge sensor signal conditioning for industrial process control.

For engineers reviewing the AD8226BRZ-R7 datasheet, AD8226BRZ-R7 pinout, AD8226BRZ-R7 application, or AD8226BRZ-R7 equivalent, key selection criteria include guaranteed CMRR ≥90 dB at G=1 (BR models), input voltage range extending below negative supply, robust ±35 V input overvoltage tolerance at ±5 V supplies, and MSOP-8 packaging for space-constrained multichannel systems.

Technical Context

The AD8226BRZ-R7 employs a three-op-amp architecture with pnp-input transistors enabling true input voltage operation below the negative rail and low input bias current (5–35 nA over temperature). Its gain-setting network uses two dedicated RG pins connected by a single resistor, defining gain as G = 1 + (49.4 kΩ/RG).

Reference terminal (REF) provides level-shifting capability with 1 V/V gain and 0.01% gain error, while rail-to-rail output swing (e.g., −VS + 0.2 V to +VS − 0.2 V at 25°C, RL = 10 kΩ) ensures full dynamic range utilization across supply voltages. Input protection withstands ±40 V beyond rails under specified conditions.

Key Specifications

Pinout & Package

AD8226BRZ-R7 is housed in an 8-lead MSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch), optimized for high-density PCB layouts and thermal performance (θJA = 135°C/W on 4-layer JEDEC board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8226BRZ-R7, AD8227ARZ-R7 trades unity-gain capability for improved high-gain accuracy, while INA333AIDRGT sacrifices supply flexibility and temperature range for near-zero offset drift - making AD8226BRZ-R7 the optimal balance for industrial multichannel systems requiring wide supply, high temp, and G = 1 support.

Availability

AD8226BRZ-R7 is available at Aetrix Electronics and suitable for industrial process controls, bridge amplifiers, medical instrumentation, and portable data acquisition requiring stable component supply across extended temperature and voltage ranges.

Supply support for AD8226BRZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The AD8226 belongs to Analog Devices' precision instrumentation amplifier product line, engineered for cost-sensitive, space-constrained applications demanding wide supply range, rail-to-rail output, and robust input protection in harsh environments.

FAQ

What is the minimum gain supported by the AD8226BRZ-R7?

The AD8226BRZ-R7 supports a minimum gain of 1, set by leaving the RG pins unconnected (infinite resistance) or using an open-circuit configuration. This is confirmed in the General Description and Table 2 of the Rev. D datasheet, distinguishing it from the AD8227 which starts at G = 5. Gain is calculated as G = 1 + (49.4 kΩ/RG), so RG = ∞ yields G = 1. The AD8226BRZ-R7 maintains specified performance including CMRR ≥90 dB and bandwidth of 1.5 MHz at G = 1.

Does the AD8226BRZ-R7 support single-supply operation?

Yes, the AD8226BRZ-R7 supports single-supply operation from 2.2 V to 36 V, as explicitly stated in the Features and Specifications sections. At V_S = 2.7 V, it delivers rail-to-rail output swing (e.g., 0.1 V to +V_S − 0.1 V with 100 kΩ load) and maintains full functionality including input voltage range down to −0.15 V (below ground). This enables direct integration into battery-powered portable data acquisition systems without dual supplies.

What is the input overvoltage protection rating for the AD8226BRZ-R7?

The AD8226BRZ-R7 is rated to withstand input voltages up to ±40 V beyond the supply rails - i.e., −V_S + 40 V maximum and +V_S − 40 V minimum - over the full −40°C to +125°C temperature range. For example, with ±5 V supplies, inputs may safely reach −35 V to +35 V without damage. This is documented in Table 4 (Absolute Maximum Ratings) and verified in Figures 16–20 of the Rev. D datasheet.

How does the REF pin function in the AD8226BRZ-R7?

The REF pin on the AD8226BRZ-R7 provides a reference input for output level shifting, with unity gain (1 V/V) and 0.01% gain error. It must be driven by a low-impedance source (R_IN = 100 kΩ, I_IN = 7 µA max) and accepts voltages from −V_S to +V_S. When used, the output becomes V_OUT = G × (V_+IN − V_−IN) + V_REF, enabling bipolar signal translation in single-supply systems. This functionality is detailed in the "Reference Terminal" section (Page 20) of the datasheet.

Is the AD8226BRZ-R7 pin-compatible with other packages in the AD8226 family?

Yes, the AD8226BRZ-R7 (MSOP-8) shares identical pinout and electrical functionality with the AD8226ARZ-R7 (SOIC-8), as confirmed in Figure 2 (Pin Configuration) and Table 6 (Pin Function Descriptions) of the Rev. D datasheet. Both variants use the same 8-pin arrangement: −IN, RG, RG, +IN, −VS, REF, VOUT, +VS. This allows direct PCB footprint interchangeability between MSOP and SOIC packages without layout changes, provided thermal and mechanical constraints are met.