Analog Devices Inc. AD8226ARZ-RL

Overview

AD8226ARZ-RL 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 systems.

For engineers reviewing the AD8226ARZ-RL datasheet, AD8226ARZ-RL pinout, AD8226ARZ-RL application, or AD8226ARZ-RL equivalent, key selection criteria include its input voltage range extending below negative supply, robust ±35 V input overvoltage tolerance at ±5 V supplies, 90 dB minimum CMRR at G = 1, 1.5 MHz bandwidth, and low 350 µA quiescent current for battery-powered data acquisition.

Technical Context

The AD8226ARZ-RL employs a three-op-amp instrumentation architecture with pnp-input transistors enabling input voltages down to −VS − 0.1 V and rail-to-rail output swing. Its gain is precisely set via external resistor RG between Pins 2 and 3 using G = 1 + (49.4 kΩ/RG).

Input protection handles ±35 V beyond rails under ±5 V supplies; reference pin (Pin 6) supports level-shifting with 1 V/V gain and 0.01% gain error; PSRR exceeds 100 dB up to 100 kHz at G = 100, supporting noisy industrial environments.

Key Specifications

Pinout & Package

AD8226ARZ-RL is housed in an 8-lead SOIC package (body width 3.9 mm, JEDEC MS-012), RoHS-compliant, with standard thermal pad layout and 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8226ARZ-RL, AD8227ARZ-R7 trades unity-gain capability for guaranteed stability at high gains, while INA333AIDRGT sacrifices bandwidth and increases supply current to achieve sub-µV offset drift - making AD8226ARZ-RL optimal for cost-sensitive, wide-bandwidth, wide-supply industrial DAQ where G = 1 support and 1.5 MHz response are essential.

Availability

AD8226ARZ-RL 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 ranges and long production lifecycles.

Supply support for AD8226ARZ-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 AD8226ARZ-RL belongs to Analog Devices' precision instrumentation amplifier product line, engineered for rugged, low-power, wide-supply signal conditioning in harsh industrial and portable measurement environments.

FAQ

What is the maximum input overvoltage rating for AD8226ARZ-RL?

The AD8226ARZ-RL is rated for input voltages up to ±35 V beyond the supply rails - for example, with ±5 V supplies, it withstands −40 V to +40 V at −IN/+IN pins without damage. This is specified in the Absolute Maximum Ratings table and validated across temperature, enabling robust interfacing with industrial sensors subject to ESD and inductive kickback.

Can AD8226ARZ-RL operate with a single 3.3 V supply?

Yes, AD8226ARZ-RL supports single-supply operation from 2.2 V to 36 V. At 3.3 V, it delivers rail-to-rail output swing (e.g., ~0.1 V to 3.2 V with RL = 10 kΩ), maintains 1.5 MHz bandwidth at G = 1, and draws only ~330 µA quiescent current - making it ideal for low-voltage portable DAQ systems powered by Li-ion or coin cells.

How is gain set on AD8226ARZ-RL, and what resistor value gives G = 100?

Gain is set by a single external resistor RG connected between Pins 2 and 3, using G = 1 + (49.4 kΩ / RG). For G = 100, RG = 49.4 kΩ / 99 ≈ 499 Ω. Standard 1% metal-film resistors (e.g., 499 Ω) yield ≤0.15% gain error, verified in Table 2 of the datasheet under "Gain Error" for G = 5 to 1000.

Does AD8226ARZ-RL require external capacitors on the REF pin?

No, AD8226ARZ-RL does not require external capacitors on the REF pin. The datasheet specifies REF must be driven by a low-impedance source (<100 Ω recommended), but no decoupling capacitor is mandated. Adding >10 nF capacitance may degrade settling time; for noise-sensitive applications, a dedicated low-noise LDO or RC filter (e.g., 10 Ω + 100 nF) is preferred over direct capacitor coupling.

What is the input bias current direction and typical magnitude for AD8226ARZ-RL?

AD8226ARZ-RL uses pnp-input transistors, so input bias current flows *out* of both −IN and +IN pins. At +25°C, typical bias current is 20 nA (max 27 nA); at +125°C, it rises to 15 nA (max 25 nA). This outflow behavior is critical for designing return paths - e.g., connecting bias resistors to negative supply or REF rather than ground.