Analog Devices Inc. AD8476ARMZ-RL

Overview

AD8476ARMZ-RL from Analog Devices is a low-power, unity-gain, fully differential amplifier optimized as an ADC driver with rail-to-rail outputs, 330 µA supply current, −126 dB HD2 / −128 dB HD3 at 10 kHz, and 6 MHz small-signal bandwidth. It serves as a precision single-ended-to-differential converter in battery-powered instrumentation and high-accuracy data acquisition systems interfacing with 16-bit SAR or Σ-Δ ADCs up to 250 kSPS.

For engineers reviewing the AD8476ARMZ-RL datasheet, AD8476ARMZ-RL pinout, AD8476ARMZ-RL application, or AD8476ARMZ-RL equivalent, key selection criteria include its VOCM-adjustable common-mode output, robust ±23 V input overvoltage tolerance, 200 µV max output offset, 39 nV/√Hz noise density, and guaranteed performance from −40°C to +125°C in the 8-lead MSOP package.

Technical Context

The AD8476ARMZ-RL implements a voltage-feedback, fully differential architecture with integrated laser-trimmed 10 kΩ gain resistors for precise unity gain (1.000 ±0.02%). Its dual feedback loops independently regulate differential output voltage (via fixed resistor network) and output common-mode voltage (via VOCM pin), enabling accurate level-shifting without degrading balance or CMRR.

It features rail-to-rail inputs and outputs, operates from single 3–18 V or dual ±1.5–±9 V supplies, and delivers 10 V/µs slew rate with 1.0 µs settling to 0.01% for 2 V step. The internal topology ensures output balance error ≤90 dB up to 1 MHz and maintains ≥90 dB CMRR across temperature and frequency.

Key Specifications

Pinout & Package

AD8476ARMZ-RL is housed in an 8-lead MSOP (Mini Small Outline Package) with exposed pad, rated for −40°C to +125°C operation. Thermal resistance θ_JA = 209°C/W on standard 4-layer JEDEC board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8475ARMZ-RL and ADA4940-1ARZ-R7, AD8476ARMZ-RL uniquely combines ultra-low power (330 µA), laser-trimmed unity gain (0.02% error), and user-adjustable VOCM in a space-constrained MSOP-making it the optimal choice for battery-powered, high-accuracy, low-frequency ADC driving where power, precision, and interface flexibility are jointly critical.

Availability

AD8476ARMZ-RL is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, medical data acquisition, and test equipment requiring stable component supply with guaranteed long-term availability and full industrial temperature support.

Supply support for AD8476ARMZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design and manufacturing expertise spanning precision amplifiers, data converters, and signal conditioning ICs.

The AD8476 belongs to Analog Devices' Precision Fully Differential Amplifier product line, engineered specifically to simplify high-accuracy, low-power signal chain design for precision ADC interfacing in harsh, size- and energy-constrained environments.

FAQ

What is the operating supply voltage range for AD8476ARMZ-RL?

The AD8476ARMZ-RL operates from a single supply of 3 V to 18 V or dual supplies of ±1.5 V to ±9 V. At +5 V single supply, it draws only 330 µA, delivering 1.5 mW total power dissipation. Absolute maximum supply voltage is ±10 V, and the device is fully specified over −40°C to +125°C.

How does the VOCM pin function in AD8476ARMZ-RL?

The VOCM pin on AD8476ARMZ-RL directly sets the output common-mode voltage (V_OUT,cm) to match the ADC's input range. When driven with a stable voltage (e.g., 1.25 V or 2.048 V), the internal common-mode feedback loop forces V_OUT,cm = VOCM. If left unconnected, AD8476ARMZ-RL self-biases VOCM to midsupply via internal resistors.

Can AD8476ARMZ-RL drive switched-capacitor ADC inputs without external buffering?

Yes, AD8476ARMZ-RL is explicitly designed to drive switched-capacitor and Σ-Δ ADC inputs directly. Its low 0.1 Ω output impedance, 10 V/µs slew rate, and 1.0 µs 0.01% settling time ensure minimal charge kickback and acquisition error-even into capacitive loads up to 20 pF per output, as verified in the datasheet.

What is the maximum input overvoltage rating for AD8476ARMZ-RL?

AD8476ARMZ-RL withstands input voltages up to +VS + 18 V and −VS − 18 V without damage, supporting robust front-end protection in industrial environments. This ±23 V tolerance (e.g., +23 V with +5 V supply) is enabled by integrated ESD diodes and internal clamping structures, eliminating need for external protection components in many cases.

Is AD8476ARMZ-RL pin-compatible with other members of the AD847x family?

No-AD8476ARMZ-RL uses the 8-lead MSOP package with specific pinout (INP, INN, +VS, VOCM, +OUT, −OUT, −VS, NC). The AD8475 variant shares the same footprint but lacks VOCM and has different pin assignments. The 16-lead LFCSP version (e.g., AD8476ACPZ-RL) is not pin-compatible. Always verify package and pin mapping before substitution.