Analog Devices Inc. AD8476BCPZ-RL

Overview

AD8476BCPZ-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 bandwidth - enabling precision single-ended-to-differential conversion in battery-powered instrumentation and 16-bit SAR/Σ-Δ data acquisition systems.

For engineers reviewing the AD8476BCPZ-RL datasheet, AD8476BCPZ-RL pinout, AD8476BCPZ-RL application, or AD8476BCPZ-RL equivalent, key selection criteria include VOCM-adjustable common-mode output, ±23 V input overvoltage tolerance, 200 µV max output offset, 39 nV/√Hz noise, and compatibility with switched-capacitor ADC front ends requiring fast settling to 16-bit accuracy.

Technical Context

The AD8476BCPZ-RL implements a voltage-feedback, fully differential architecture with integrated laser-trimmed 10 kΩ gain resistors for precise unity gain (1 ppm/°C drift) and dual feedback loops: one fixes differential gain, the other forces output common-mode voltage to match VOCM input. Its internal summing nodes operate rail-to-rail, supporting input ranges up to ±23 V beyond supplies.

Designed specifically for driving precision ADCs, it delivers 10 V/µs slew rate and settles to 0.001% in 1.6 µs for 2 V steps, while maintaining >90 dB CMRR from dc to 100 kHz and <5 ppm gain nonlinearity - critical for high-fidelity signal conditioning in low-power, high-resolution data converters.

Key Specifications

Pinout & Package

AD8476BCPZ-RL is housed in a 16-lead, 3 mm × 3 mm LFCSP package with exposed paddle (EPAD) requiring soldering to ground plane for thermal and electrical performance. Pin 12 is NC (no internal connection); all −VS pins (13–16) and +VS pins (5–8) must be connected to respective supply rails.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8476BCPZ-RL, AD8475ARMZ trades VOCM adjustability for lower power and simpler layout, while ADA4940-1ACPZ-R7 offers orders-of-magnitude higher bandwidth at significantly higher current and design complexity - making AD8476BCPZ-RL optimal for precision, low-power, 250 kSPS-class data acquisition.

Availability

AD8476BCPZ-RL is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable medical devices, and automotive diagnostic tools requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for AD8476BCPZ-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 decades of expertise in precision signal conditioning and data conversion.

The AD8476 belongs to Analog Devices' precision fully differential amplifier product line, engineered specifically to simplify high-accuracy, low-power ADC driving - eliminating external resistor networks while maintaining 16-bit integrity in demanding industrial and medical applications.

FAQ

What is the operating supply voltage range for the AD8476BCPZ-RL?

The AD8476BCPZ-RL operates from a single supply of 3 V to 18 V or dual supplies of ±1.5 V to ±9 V. This wide range allows direct interfacing with diverse power domains - including 3.3 V microcontrollers, 5 V industrial logic, and 12 V automotive systems - without level-shifting circuitry. Absolute maximum ratings limit supply to ±10 V.

How does the VOCM pin function in the AD8476BCPZ-RL?

The VOCM pin on the AD8476BCPZ-RL directly sets the output common-mode voltage to match the input range of downstream ADCs. When driven with a stable voltage (e.g., 2.5 V), the internal common-mode feedback loop forces (V+OUT + V−OUT)/2 to equal that value. If left unconnected, VOCM self-biases to midsupply, but external control is required for non-standard ADC common-mode levels.

Can the AD8476BCPZ-RL drive switched-capacitor ADC inputs without external buffering?

Yes, the AD8476BCPZ-RL is explicitly designed to drive switched-capacitor ADC inputs. Its high-current output stage (35 mA short-circuit limit), low 0.1 Ω output impedance, and 10 V/µs slew rate enable fast settling (<1.6 µs to 0.001%) into typical ADC input capacitances, minimizing acquisition errors without requiring additional op-amp buffers.

What is the maximum input overvoltage tolerance of the AD8476BCPZ-RL?

The AD8476BCPZ-RL withstands input voltages up to +VS + 18 V and −VS − 18 V due to integrated ESD protection diodes - enabling robust operation in industrial settings with inductive kickback or lightning-induced surges. For example, on ±5 V supplies, inputs remain protected up to ±23 V, eliminating need for external clamping components in many cases.

Is the AD8476BCPZ-RL suitable for driving 16-bit ADCs at 250 kSPS?

Yes, the AD8476BCPZ-RL is specified to drive 16-bit converters up to 250 kSPS. Its 1.6 µs settling time to 0.001%, 200 µV max output offset, 39 nV/√Hz noise, and −102 dB THD+N at 10 kHz ensure minimal code-dependent errors and preserved effective number of bits (ENOB) in high-resolution data acquisition systems.