Analog Devices Inc. AD7383-4BCPZ

Overview

AD7383-4BCPZ from Analog Devices is a 16-bit, quad-channel, pseudo-differential SAR ADC with simultaneous sampling at 4 MSPS throughput, −40°C to +125°C operation, on-chip 2.5 V reference, and 24-lead 4 mm × 4 mm LFCSP package-designed for high-precision motor current and position feedback acquisition.

For engineers reviewing the AD7383-4BCPZ datasheet, AD7383-4BCPZ pinout, AD7383-4BCPZ application, or AD7383-4BCPZ equivalent, key selection criteria include guaranteed 16-bit no-missing-codes performance, 86.7 dB typical SNR at 3.3 V reference, ±3.8 LSB max INL error, oversampling-enabled dynamic range boost, and quad-channel isolation exceeding −110 dB.

Technical Context

The AD7383-4BCPZ implements four independent successive approximation register (SAR) cores sharing a single CS-controlled conversion trigger, enabling true simultaneous sampling across all channels. Its pseudo-differential input structure uses AINx− as common-mode bias (typically VREF/2) and AINx+ as signal input (0 V to VREF), reducing amplifier drive burden via 5 pF hold-mode input capacitance.

It integrates an on-chip oversampling block supporting normal averaging and rolling average modes, delivering up to 2-bit resolution boost (e.g., 18-bit effective resolution at OSR = 8×) and improved SNR (94.7 dB typical with external 3.3 V reference). The SPI interface supports 1-wire, 2-wire, and 4-wire readout modes with separate VLOGIC (1.65 V–3.6 V) for mixed-voltage system interfacing.

Key Specifications

Pinout & Package

Package: 24-lead, 4 mm × 4 mm LFCSP (CP-24-251) with exposed pad connected to GND for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7384-4BCPZ, the AD7383-4BCPZ provides 2 extra bits of resolution and tighter INL for precision position feedback, while AD7380-4BCPZ trades simplified front-end design for superior noise immunity at the cost of added analog components.

Availability

AD7383-4BCPZ 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 AD7383-4BCPZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.

The AD7383-4BCPZ belongs to the AD738x quad SAR ADC product line, engineered specifically for high-speed, high-accuracy simultaneous sampling in demanding motor control, industrial automation, and optical communication systems.

FAQ

What is the maximum sampling rate supported by the AD7383-4BCPZ?

The AD7383-4BCPZ supports a maximum throughput rate of 4 MSPS per channel with simultaneous sampling across all four ADCs. This corresponds to a minimum inter-conversion interval (tCYC) of 250 ns. The conversion time (tCONVERT) is 190 ns, and the acquire time (tACQUIRE) is 110 ns-enabling deterministic real-time acquisition for fast-control-loop applications such as servo motor drives.

Does the AD7383-4BCPZ include an internal voltage reference?

Yes, the AD7383-4BCPZ integrates a buffered 2.5 V internal reference with 10 ppm/°C temperature coefficient and 7 µV RMS noise. It is accessible via the REFIO pin and can be used directly or as a reference for external circuitry. When enabled, the internal reference eliminates the need for an external reference component, simplifying BOM and layout-though an external 2.5 V to 3.3 V reference may be selected via the REFSEL bit for higher accuracy or system-level reference sharing.

How does the oversampling feature improve performance in the AD7383-4BCPZ?

The AD7383-4BCPZ's on-chip oversampling block supports normal averaging and rolling average modes, increasing effective resolution by up to 2 bits (e.g., 18-bit at OSR = 8×) and improving dynamic range-94.7 dB typical with external 3.3 V reference. Oversampling reduces quantization noise and relaxes anti-alias filter requirements, while also lowering effective SCLK speed needs for the same data throughput, easing timing margins in resource-constrained microcontroller interfaces.

What is the function of the ALERT pin on the AD7383-4BCPZ?

The ALERT pin (multifunction SDOD/ALERT) on the AD7383-4BCPZ is an open-drain output that asserts low when any of the four channel conversion results exceed user-programmable high or low threshold registers. This hardware interrupt enables immediate fault detection-such as overcurrent or overtemperature events-without CPU polling. Thresholds are set via ALERT_LOW_THRESHOLD and ALERT_HIGH_THRESHOLD registers, and the alert condition clears automatically after readback or via register write.

Is the AD7383-4BCPZ pin-compatible with other devices in the AD738x family?

Yes, the AD7383-4BCPZ is pin-compatible with the AD7384-4BCPZ (14-bit) and shares the same 24-lead 4 mm × 4 mm LFCSP package, pin assignments, and timing specifications. This allows hardware reuse across performance tiers-e.g., upgrading from AD7384-4BCPZ to AD7383-4BCPZ for enhanced resolution without PCB redesign. However, it is not pin-compatible with the differential-input AD7380-4BCPZ, which uses different analog input pin configurations.