Analog Devices Inc. AD8476BCPZ-R7

Overview

AD8476BCPZ-R7 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. It serves as a precision single-ended-to-differential converter in battery-powered instrumentation and high-accuracy data acquisition systems.

For engineers reviewing the AD8476BCPZ-R7 datasheet, AD8476BCPZ-R7 pinout, AD8476BCPZ-R7 application, or AD8476BCPZ-R7 equivalent, key selection criteria include output common-mode control via VOCM, robust ±23 V input overvoltage tolerance, 200 µV max output offset, and compatibility with SAR/Σ-Δ ADCs up to 250 kSPS.

Technical Context

The AD8476BCPZ-R7 implements a voltage-feedback fully differential architecture with integrated laser-trimmed 10 kΩ gain resistors, enabling precise unity gain (1 V/V) without external components. Its dual feedback loops independently regulate differential output voltage (via fixed resistor network) and output common-mode voltage (via VOCM-controlled internal loop).

This architecture ensures output balance error ≤90 dB across frequency, supports VOCM adjustment from −VS +1 V to +VS −1 V, and maintains rail-to-rail output swing (e.g., −4.845 V to +4.82 V on ±5 V supplies) while rejecting common-mode disturbances up to 90 dB at DC.

Key Specifications

Pinout & Package

AD8476BCPZ-R7 is packaged in a 8-lead MSOP (3 mm × 3 mm) with exposed pad. Pin 6 (NC) must not be connected; all other pins are electrically active and thermally tied to the die.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8476BCPZ-R7, AD8475ARMZ-R7 offers simpler interface but no VOCM control or unity gain, while ADA4941-1YCPZ-R7 delivers higher speed and flexibility at 3.6× higher quiescent current and increased layout sensitivity to resistor matching.

Availability

AD8476BCPZ-R7 is available at Aetrix Electronics and suitable for instrumentation signal conditioning, battery-powered data loggers, and industrial sensor interface applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for AD8476BCPZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD8476 belongs to Analog Devices' precision fully differential amplifier product line, engineered specifically for low-power, high-accuracy ADC driving and single-ended-to-differential conversion in demanding industrial and medical applications.

FAQ

What is the supply voltage range supported by the AD8476BCPZ-R7?

The AD8476BCPZ-R7 operates from a single supply of 3 V to 18 V or dual supplies of ±1.5 V to ±9 V. It is fully specified over this range, with typical performance measured at ±5 V and +5 V. Absolute maximum supply rating is ±10 V; exceeding this may cause permanent damage.

Does the AD8476BCPZ-R7 require external gain-setting resistors?

No. The AD8476BCPZ-R7 integrates precision laser-trimmed 10 kΩ resistors to achieve exact unity gain (1 V/V) without any external components. This eliminates resistor matching errors and reduces board space, making it ideal for compact, high-accuracy designs where gain stability is critical.

How does the VOCM pin function in the AD8476BCPZ-R7?

The VOCM pin on the AD8476BCPZ-R7 sets the output common-mode voltage to match the ADC's input range. When driven with a voltage between −VS +1 V and +VS −1 V, the internal common-mode feedback loop forces the average of +OUT and −OUT to equal that voltage. If left unconnected, VOCM self-biases to midsupply.

Can the AD8476BCPZ-R7 drive switched-capacitor ADC inputs directly?

Yes. The AD8476BCPZ-R7 features a high-current output stage (35 mA short-circuit limit) and low 0.1 Ω output impedance, enabling direct drive of switched-capacitor ADC inputs without external buffering. Its fast 1.0 µs settling time to 0.01% supports 250 kSPS acquisition rates with 16-bit accuracy.

What is the maximum input overvoltage tolerance of the AD8476BCPZ-R7?

The AD8476BCPZ-R7 withstands input voltages up to +VS +18 V and −VS −18 V due to integrated ESD protection diodes. This ±23 V tolerance relative to supplies allows safe operation in industrial environments with transient surges, eliminating the need for external protection components in many applications.