Analog Devices Inc. AD7732BRUZ-REEL7

Overview

AD7732BRUZ-REEL7 from Analog Devices is a 24-bit sigma-delta analog-to-digital converter with two fully differential input channels, ±10 V input range, 18-bit peak-to-peak resolution at 500 Hz, on-chip per-channel system calibration, and 3-wire SPI-compatible serial interface. It operates from a single 5 V analog supply and supports industrial process control systems requiring high accuracy and fast channel switching.

For engineers reviewing the AD7732BRUZ-REEL7 datasheet, AD7732BRUZ-REEL7 pinout, AD7732BRUZ-REEL7 application, or AD7732BRUZ-REEL7 equivalent, key selection considerations include its 2-channel differential architecture, ±16.5 V overvoltage tolerance without adjacent channel crosstalk, 24-bit no-missing-codes performance, –40°C to +105°C extended temperature rating, and TSSOP-28 package compatibility with high-density industrial PCB layouts.

Technical Context

The AD7732BRUZ-REEL7 implements a programmable sigma-delta modulator with digital filter configurable via filter word (FW) register, enabling trade-offs between noise performance and throughput - e.g., 18-bit p-p resolution at 500 Hz or 14-bit p-p at 15 kHz. Its analog front end integrates input buffers, a 2-channel multiplexer, and reference detect circuitry supporting "No-Reference" operation.

Each channel features independent zero-scale and full-scale calibration registers, allowing per-channel system calibration to reduce offset and gain errors to noise-floor levels. The device accepts up to ±16.5 V common-mode overvoltage on either input while maintaining >110 dB channel-to-channel isolation and stable performance across the full –40°C to +105°C range.

Key Specifications

Pinout & Package

Package: 28-lead TSSOP (4.4 mm × 9.7 mm, 0.65 mm pitch), RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-precision, multi-channel ADC applications.

Compared with AD7732BRUZ-REEL7, AD7734BRUZ trades differential input integrity for higher channel count in single-ended mode, while AD7738BRUZ adds architectural flexibility at the cost of increased complexity and larger footprint - AD7732BRUZ-REEL7 remains optimal for dedicated dual-differential, high-isolation, ±10 V industrial sensing.

Availability

AD7732BRUZ-REEL7 is available at Aetrix Electronics and suitable for PLC analog input modules, multiplexed sensor hubs, industrial weigh scale controllers, high-accuracy data acquisition systems, and process control transmitters requiring stable component supply across long production lifecycles.

Supply support for AD7732BRUZ-REEL7 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 Wilmington, MA, with design centers worldwide.

The AD7732BRUZ-REEL7 belongs to Analog Devices' high-precision sigma-delta ADC product line, engineered specifically for industrial process control and automated test equipment demanding robustness, accuracy, and configurability in harsh environments.

FAQ

What is the maximum analog input voltage the AD7732BRUZ-REEL7 can tolerate without damage?

The AD7732BRUZ-REEL7 has an absolute maximum AIN-to-AGND rating of ±50 V per the datasheet Absolute Maximum Ratings table. However, for guaranteed performance without degradation to adjacent channels, the overvoltage limit is ±16.5 V. Operation beyond ±16.5 V may trigger the OVR bit but does not damage the AD7732BRUZ-REEL7 if within ±50 V limits and duration is brief.

Does the AD7732BRUZ-REEL7 support true bipolar input ranges?

Yes, the AD7732BRUZ-REEL7 supports true bipolar input ranges including ±10 V and ±5 V on both differential input channels. Its analog front end operates from a single 5 V AVDD supply while maintaining full common-mode rejection and specified INL performance across the entire bipolar span - no external level-shifting circuitry is required.

How does the AD7732BRUZ-REEL7 handle reference loss detection?

The AD7732BRUZ-REEL7 implements "No-Reference" detect capability on the REFIN(+) and REFIN(–) pins. When reference voltage falls below 0.5 V, the NOREF bit in the Channel Status Register is set, and conversion results become invalid. This feature enables fail-safe operation in safety-critical industrial systems by providing immediate digital notification of reference failure.

Can the AD7732BRUZ-REEL7 perform per-channel calibration without external equipment?

Yes, the AD7732BRUZ-REEL7 supports on-chip per-channel system calibration using internal zero-scale and full-scale calibration registers. Users can execute calibration routines by writing to Channel Zero-Scale Calibration Registers and Channel Full-Scale Calibration Registers - no external precision voltage sources or test fixtures are needed for basic system-level correction.

What serial interface protocols is the AD7732BRUZ-REEL7 compatible with?

The AD7732BRUZ-REEL7 features a 3-wire serial interface compatible with SPI™, QSPI™, MICROWIRE™, and DSP serial protocols. All logic inputs (SCLK, DIN, CS, RESET, SYNC/P1, P0) are Schmitt-triggered for noise immunity, and the interface supports both read and write operations with configurable timing per the timing specifications in the datasheet.