Analog Devices Inc. AD7329BRUZ

Overview

AD7329BRUZ from Analog Devices is a 12-bit plus sign (13-bit) SAR ADC with true bipolar input capability, 8-channel multiplexed analog inputs, software-selectable input ranges (±10 V, ±5 V, ±2.5 V, 0 V to +10 V), and 1 MSPS throughput rate. It integrates an internal 2.5 V reference, high-impedance analog inputs, and separate MUXOUT/ADCIN pins for signal conditioning-used in industrial data acquisition systems requiring high-voltage, mixed-polarity sensor interfacing.

For engineers reviewing the AD7329BRUZ datasheet, AD7329BRUZ pinout, AD7329BRUZ application, or AD7329BRUZ equivalent, key selection criteria include true bipolar range support, channel sequencing flexibility, differential/single-ended/pseudo-differential configuration per channel, iCMOS™ high-voltage process compatibility, and SPI/QSPI/MICROWIRE™ serial interface timing at 1 MSPS.

Technical Context

The AD7329BRUZ implements a 13-bit successive approximation register (SAR) architecture with integrated track-and-hold, channel sequencer, and programmable input structure supporting single-ended, true differential, and pseudo-differential modes. Its iCMOS™ process enables ±16.5 V analog supply rails (VDD/VSS) while maintaining low power consumption and high analog input impedance across all four software-selectable ranges.

It features independent per-channel range programming via dedicated range registers, configurable output coding (straight binary or two's complement), and three distinct power management modes-autostandby, autoshutdown, and full shutdown-with sub-µA quiescent current. The MUXOUT± and ADCIN± pins provide physical separation between multiplexer output and ADC input stages, enabling external filtering or buffering before conversion.

Key Specifications

Pinout & Package

AD7329BRUZ is housed in a 24-lead TSSOP package (4.4 mm × 7.8 mm, 0.65 mm pitch) with exposed pad for thermal performance. Pin assignments are optimized for analog/digital ground separation, high-voltage analog routing, and noise-sensitive serial interface layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7328BRUZ, AD7329BRUZ trades minor DC accuracy for broader application flexibility in mixed-signal systems; compared with AD7324BRUZ, it doubles channel count at the cost of larger footprint and higher power-making AD7329BRUZ optimal for 8-input industrial DAQ where configurability outweighs metrology precision.

Availability

AD7329BRUZ is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, energy metering front-ends, and motor drive current sensing requiring stable component supply and long-term production continuity.

Supply support for AD7329BRUZ 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.

The AD7329BRUZ belongs to the AD732x family of high-voltage, software-configurable SAR ADCs designed specifically for industrial data acquisition systems needing flexible bipolar/unipolar input handling and robust noise immunity.

FAQ

What input voltage ranges does the AD7329BRUZ support?

The AD7329BRUZ supports four software-selectable input ranges per channel: ±10 V, ±5 V, ±2.5 V, and 0 V to +10 V. Each of the eight analog inputs can be independently configured to any of these ranges via dedicated range registers. This allows mixed-range operation-for example, VIN0 set to ±10 V for a pressure sensor while VIN1 uses 0 V to +10 V for a temperature transducer-all within a single AD7329BRUZ device.

How does the AD7329BRUZ handle differential versus single-ended inputs?

The AD7329BRUZ supports three input topologies: single-ended, true differential, and pseudo-differential-each selectable per channel via mode bits in the control register. In true differential mode, VINx and VINy form a matched pair with 13-bit resolution (FSR/8192); in single-ended mode, each input references AGND with 12-bit plus sign resolution (FSR/4096). Pseudo-differential mode uses one input as reference and the other as signal, offering partial common-mode rejection.

Can the AD7329BRUZ operate with an external reference?

Yes, the AD7329BRUZ supports external reference operation via the REFIN/REFOUT pin. When an external reference between 2.5 V and 3 V is applied, the device scales its full-scale range accordingly-for instance, a 3 V reference enables true bipolar ±12 V input capability. The internal 2.5 V reference remains available and can be disabled in software. A 680 nF capacitor is required on the REFIN/REFOUT pin regardless of reference source.

What power supply configurations are required for the AD7329BRUZ?

The AD7329BRUZ requires three independent supply domains: VDD (+12 V to +16.5 V) and VSS (−12 V to −16.5 V) for the analog front-end; VCC (2.7 V to 5.25 V) for the ADC core and serial interface logic; and VDRIVE (2.7 V to 5.25 V) to set logic-level thresholds. VDRIVE must not exceed VCC by more than 0.3 V. AGND and DGND must be held within ±0.3 V of each other to prevent performance degradation.

Does the AD7329BRUZ include power-saving modes?

Yes, the AD7329BRUZ offers four operational modes: Normal (full performance), Autostandby (reduced IDD/ISS at 250 kSPS), Autoshutdown (sub-µA standby with automatic wake-on-CS), and Full Shutdown (1 µA total supply current). These are controlled by PM1/PM0 bits in the control register. Full Shutdown mode retains register contents and enables wake-up in <500 µs when using internal reference, making it ideal for battery-powered DAQ nodes.