Analog Devices Inc. AD7388-4BCPZ-RL

Overview

AD7388-4BCPZ-RL from Analog Devices is a 12-bit, quad, simultaneous-sampling SAR ADC with single-ended analog inputs, 4 MSPS throughput, ±0.2 LSB typical INL, and −40°C to +125°C operation - used in motor control current sense and traveling wave fault detection systems requiring precise multi-channel timing alignment.

For engineers reviewing the AD7388-4BCPZ-RL datasheet, AD7388-4BCPZ-RL pinout, AD7388-4BCPZ-RL application, or AD7388-4BCPZ-RL equivalent, key selection criteria include simultaneous sampling accuracy, oversampling-enabled SNR boost (up to 80 dB at OSR = 8), 24-lead LFCSP package compatibility, and ALERT threshold monitoring for real-time out-of-range detection.

Technical Context

The AD7388-4BCPZ-RL implements four independent successive approximation register (SAR) cores sharing a common CS-controlled acquisition trigger, enabling true simultaneous sampling across all four channels. Its analog input structure uses 15 pF sampling capacitors and 200 Ω switch resistance to minimize amplifier drive burden.

It integrates an on-chip 2.5 V reference (10 ppm/°C max) and supports external references from 2.5 V to 3.3 V via REFIO. The serial interface operates in 1-wire, 2-wire, or 4-wire mode with SCLK up to 80 MHz and features configurable ALERT output tied to programmable high/low thresholds.

Key Specifications

Pinout & Package

AD7388-4BCPZ-RL is housed in a 24-lead lead frame chip scale package (LFCSP), CP-24-251 variant, with 0.5 mm pitch and thermally enhanced exposed pad connected to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7387-4BCPZ-RL and AD7386-4BCPZ-RL, the AD7388-4BCPZ-RL offers the optimal balance of speed, power efficiency (191 mW max), and moderate linearity for cost-sensitive industrial motor control - delivering 12-bit fidelity with lowest latency and smallest code size overhead in firmware.

Availability

AD7388-4BCPZ-RL is available at Aetrix Electronics and suitable for motor control position feedback, traveling wave fault detection, and Erbium-doped fiber amplifier (EDFA) applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7388-4BCPZ-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 AD738x-4 product line delivers quad simultaneous-sampling SAR ADCs optimized for real-time control and high-fidelity data acquisition - designed specifically for applications demanding deterministic timing, low latency, and robust operation in harsh environments.

FAQ

What is the maximum sampling rate of the AD7388-4BCPZ-RL?

The AD7388-4BCPZ-RL achieves a maximum throughput rate of 4 MSPS per channel in single-channel pair mode. This rate applies to all four ADCs simultaneously, with conversion time specified at 190 ns and tCYC of 250 ns. In alternating channel mode (SEQ = 1), the effective rate per channel drops to 2 MSPS due to sequencing overhead.

Does the AD7388-4BCPZ-RL support external reference voltage?

Yes, the AD7388-4BCPZ-RL supports external reference voltages from 2.5 V to 3.3 V applied to the REFIO pin. When using an external reference, the internal 2.5 V reference must be disabled by setting the REFSEL bit in Configuration 1 Register to 1 after VCC and VLOGIC are stable. A 1 µF decoupling capacitor is required on REFIO regardless of reference source.

How does the ALERT function work on the AD7388-4BCPZ-RL?

The ALERT function on the AD7388-4BCPZ-RL is implemented on the SDOD pin, which operates as an open-drain output asserting low when any channel's conversion result exceeds user-programmed high or low thresholds stored in Alert High/Low Threshold Registers. Alert assertion occurs within 220 ns of CS falling edge, and clearing takes 10 ns after CS rising edge.

What package type is used for the AD7388-4BCPZ-RL?

The AD7388-4BCPZ-RL uses a 24-lead lead frame chip scale package (LFCSP), designated CP-24-251, measuring 4 mm × 4 mm with 0.5 mm pitch and an exposed thermal pad. This package provides low thermal resistance (θJC = 0.431°C/W) and is RoHS-compliant with Pb-free soldering reflow profile rated to 260°C.

Can the AD7388-4BCPZ-RL perform oversampling, and what benefit does it provide?

Yes, the AD7388-4BCPZ-RL includes an on-chip oversampling block supporting normal averaging and rolling average modes with OSR up to 8×. At OSR = 8, SNR improves from 73.7 dB to 80 dB - effectively adding ~1.2 bits of resolution - while reducing required SCLK frequency and easing anti-alias filter design for bandwidth-limited applications.