Analog Devices Inc. AD7380-4BCPZ-RL

Overview

AD7380-4BCPZ-RL from Analog Devices is a quad, simultaneous-sampling, 16-bit SAR ADC with fully differential analog inputs, 4 MSPS throughput, 92 dB SNR (VREF = 3.3 V), and on-chip oversampling supporting up to 2-bit resolution boost - deployed in motor control position feedback and high-channel-density data acquisition systems.

For engineers reviewing the AD7380-4BCPZ-RL datasheet, AD7380-4BCPZ-RL pinout, AD7380-4BCPZ-RL application, or AD7380-4BCPZ-RL equivalent, key selection criteria include simultaneous sampling integrity, channel-to-channel isolation (−126 dB), differential input common-mode range (0.2 V to VREF − 0.2 V), and LFCSP-24 package compatibility with high-temperature industrial layouts.

Technical Context

The AD7380-4BCPZ-RL integrates four independent SAR cores sharing a single external reference (2.5 V–3.3 V) and synchronized conversion timing, enabling true simultaneous sampling across all four channels with aperture delay match ≤145 ps and channel-to-channel isolation of −126 dB.

Its serial interface supports 1-wire, 2-wire, or 4-wire output modes with separate SDOA/SDOB/SDOC/SDOD pins, operates with independent VCC (3.0–3.6 V) and VLOGIC (1.65–3.6 V) supplies, and implements two oversampling modes - normal averaging and rolling average - to deliver up to 97.7 dB SNR at OSR = 8×.

Key Specifications

Pinout & Package

AD7380-4BCPZ-RL is housed in a 4 mm × 4 mm, 24-lead LFCSP (CP-24-251) with exposed pad (EPAD) requiring connection to GND for thermal and electrical performance. Pin count and layout align with the AD7380-4 family's pin-compatible footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad SAR ADC applications.

Compared with AD7381-4BCPZ-RL, the AD7380-4BCPZ-RL provides 2 extra bits of resolution and 7 dB higher SNR for demanding control loops; versus AD4680BCPZ-RL7, it delivers true quad-channel simultaneity in one package, eliminating inter-device skew and reducing BOM count by 50%.

Availability

AD7380-4BCPZ-RL is available at Aetrix Electronics and suitable for motor control position feedback, motor control current sense, and high-channel-density data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7380-4BCPZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The AD7380-4BCPZ-RL belongs to Analog Devices' high-speed SAR ADC product line, engineered specifically for deterministic, low-latency, multi-channel acquisition in real-time control and instrumentation applications.

FAQ

What is the maximum external reference voltage supported by the AD7380-4BCPZ-RL?

The AD7380-4BCPZ-RL accepts an external reference voltage from 2.49 V to 3.4 V, with optimal SNR achieved at 3.3 V. Operation above 3.3 V is permitted but does not increase full-scale range beyond VREF × 2 - the LSB size scales linearly with VREF, so 3.3 V yields 100.7 µV/LSB at 16-bit resolution. The REFIN pin must be decoupled with a 1 µF capacitor to GND per the datasheet layout guidelines.

Does the AD7380-4BCPZ-RL support true simultaneous sampling across all four channels?

Yes, the AD7380-4BCPZ-RL performs true simultaneous sampling: all four SAR cores initiate acquisition on the same CS falling edge, with aperture delay match specified at ≤145 ps. This guarantees phase-coherent capture essential for vector control and I/Q demodulation. The functional block diagram and timing specifications (tCONVERT, tACQUIRE) confirm synchronized internal sampling clocks - no interleaving or time-division multiplexing is used.

How does the oversampling feature of the AD7380-4BCPZ-RL improve dynamic range?

The AD7380-4BCPZ-RL implements two oversampling modes - normal averaging and rolling average - that digitally average multiple samples to reduce quantization noise. At OSR = 8×, it achieves 97.7 dB SNR and effectively boosts resolution by 2 bits (to 18-bit equivalent), increasing dynamic range by ~5.7 dB. This allows lower bandwidth applications (e.g., <500 kHz) to meet stringent ENOB requirements without external filtering or higher-cost delta-sigma solutions.

What is the purpose of the REGCAP pin on the AD7380-4BCPZ-RL?

The REGCAP pin on the AD7380-4BCPZ-RL connects to the output of an internal 1.9 V regulator used exclusively for biasing the SAR core and reference buffer. It must be decoupled to GND with a 1 µF ceramic capacitor placed close to the pin. Failure to properly decouple REGCAP causes increased noise and degraded INL/SNR performance - the datasheet specifies this as mandatory for specification compliance, not optional layout guidance.

Can the AD7380-4BCPZ-RL operate with different supply voltages for analog and digital sections?

Yes, the AD7380-4BCPZ-RL features independent VCC (3.0–3.6 V) and VLOGIC (1.65–3.6 V) supplies, allowing direct interface with 1.8 V, 2.5 V, or 3.3 V controllers without level shifters. VCC powers the analog core and reference circuitry; VLOGIC powers the SPI interface logic. Both rails must be present before applying the external reference, and sequencing is flexible - VCC and VLOGIC may be powered in any order per Absolute Maximum Ratings.