Analog Devices Inc. AD7387-4BCPZ

Overview

AD7387-4BCPZ from Analog Devices is a 14-bit, quad, simultaneous-sampling SAR ADC with single-ended analog inputs, 4 MSPS throughput, 82.4 dB SNR at 3.3 V reference, ±1 LSB INL, and operation from −40°C to +125°C. It serves as the core data acquisition engine in high-speed motor current and position feedback systems requiring precise, time-aligned sampling across four channels.

For engineers reviewing the AD7387-4BCPZ datasheet, AD7387-4BCPZ pinout, AD7387-4BCPZ application, or AD7387-4BCPZ equivalent, key selection considerations include its simultaneous 4-channel sampling architecture, oversampling-enabled dynamic range enhancement (up to 90 dB), 24-lead LFCSP package with integrated 2.5 V reference, and support for 1.8 V/2.5 V/3.3 V logic interfaces.

Technical Context

The AD7387-4BCPZ implements four independent successive approximation register (SAR) cores sharing a common serial interface, enabling true simultaneous sampling and conversion of four single-ended analog inputs on the falling edge of CS. Its internal 2.5 V reference (10 ppm/°C max) or external 2.5 V–3.3 V reference supports flexible system-level voltage scaling.

It features configurable oversampling (normal or rolling average) that delivers up to 2-bit resolution boost and reduces effective SCLK speed requirements. The device uses a 4-wire serial output mode for full-throughput concurrent readback or 1-wire mode for reduced pin count, with separate VLOGIC supply supporting mixed-voltage digital interfacing.

Key Specifications

Pinout & Package

AD7387-4BCPZ is housed in a 24-lead lead frame chip scale package (LFCSP, CP-24-251) with exposed pad (EPAD) requiring connection to GND for thermal and electrical integrity. Package dimensions are 4 mm × 4 mm × 0.85 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad simultaneous-sampling ADC applications.

Compared with AD7386-4BCPZ and AD7388-4BCPZ, the AD7387-4BCPZ strikes a balanced trade-off: it delivers 14-bit resolution with superior INL (±1 LSB) and SNR (82.4 dB), making it optimal for closed-loop industrial drives where both linearity and noise performance constrain control loop stability.

Availability

AD7387-4BCPZ is available at Aetrix Electronics and suitable for motor control position feedback, motor control current sense, and data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7387-4BCPZ 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, serving industrial, automotive, communications, and healthcare markets.

The AD738x-4 family was designed specifically for high-speed, multi-channel data acquisition in real-time control systems-emphasizing simultaneous sampling integrity, oversampling flexibility, and ruggedized packaging for harsh environments.

FAQ

What is the maximum sampling rate of the AD7387-4BCPZ?

The AD7387-4BCPZ achieves a maximum throughput rate of 4 MSPS per channel in single-channel pair mode. This rate applies to all four ADCs simultaneously, meaning the device captures and converts four analog inputs every 250 ns. The alternating channel mode reduces this to 2 MSPS when sequencing across channels, but true simultaneous sampling maintains full 4 MSPS aggregate bandwidth across all channels without interleaving artifacts.

Does the AD7387-4BCPZ include an internal voltage reference?

Yes, the AD7387-4BCPZ integrates a 2.5 V internal reference with a maximum temperature coefficient of 10 ppm/°C. This reference is accessible at the REFCAP pin (Pin 15) and can be used directly or disabled in favor of an external 2.5 V–3.3 V reference applied to REFIO (Pin 17). The internal reference supports full 14-bit performance and eliminates the need for external reference components in space-constrained designs.

How does the ALERT function operate on the AD7387-4BCPZ?

The ALERT function on the AD7387-4BCPZ is implemented on Pin 24 (SDOD/ALERT), which operates as an open-drain output asserting low when any conversion result exceeds user-configured high or low thresholds stored in Alert High/Low Threshold Registers. The assertion occurs within 220 ns of CS activation, enabling hardware-triggered fault response without CPU intervention-critical for overcurrent or overtemperature protection in motor drives.

Can the AD7387-4BCPZ interface with a 1.8 V microcontroller?

Yes, the AD7387-4BCPZ supports 1.8 V logic interfacing via its dedicated VLOGIC supply pin (Pin 2), which accepts 1.65 V–3.6 V. When VLOGIC = 1.8 V, all digital inputs (CS, SDI, SCLK) and outputs (SDOA–SDOD) comply with 1.8 V logic thresholds, allowing direct connection to modern low-voltage MCUs and FPGAs without level-shifting circuitry-reducing BOM cost and signal integrity risk.

What package type is used for the AD7387-4BCPZ?

The AD7387-4BCPZ is packaged in a 24-lead lead frame chip scale package (LFCSP, CP-24-251) measuring 4 mm × 4 mm × 0.85 mm with an exposed thermal pad (EPAD). This package provides excellent thermal performance (θJC = 0.431 °C/W) and low inductance, essential for high-speed ADC operation. The EPAD must be soldered to a solid GND plane to ensure proper thermal dissipation and signal integrity.