Analog Devices Inc. AD7091R-8BRUZ

Overview

AD7091R-8BRUZ from Analog Devices is an 8-channel, 12-bit, 1 MSPS successive approximation register (SAR) analog-to-digital converter optimized for ultralow-power battery-operated systems. It integrates a 2.5 V reference (5 ppm/°C drift), programmable channel sequencer, and SPI-compatible interface, with 1.4 mW power consumption at 3 V/1 MSPS and 435 nA power-down current - enabling high-precision data acquisition in space-constrained industrial and medical sensors.

For engineers reviewing the AD7091R-8BRUZ datasheet, AD7091R-8BRUZ pinout, AD7091R-8BRUZ application, or AD7091R-8BRUZ equivalent, key selection considerations include multichannel sequencing capability, on-chip reference accuracy, daisy-chain support for scalable ADC arrays, and guaranteed no-missing-codes performance across −40°C to +125°C operation.

Technical Context

The AD7091R-8BRUZ implements a true SAR architecture with no pipeline latency, delivering deterministic 600 ns conversion time and 400 ns acquisition time. Its integrated channel sequencer supports preprogrammed scan orders across all eight single-ended inputs, while the MUXOUT/ADCIN dual-pin architecture enables external signal conditioning without additional op-amps.

It features a multifunction ALERT/BUSY/GPO0 pin and dedicated GPO1 output, both configurable via the on-chip configuration register. The device uses separate VDD (2.7–5.25 V) and VDRIVE (1.8–5.25 V) supplies, allowing logic-level flexibility independent of analog rail - critical for mixed-voltage system integration.

Key Specifications

Pinout & Package

AD7091R-8BRUZ is housed in a 24-lead, 4 mm × 4 mm LFCSP package with exposed pad (EPAD), optimized for thermal performance and PCB area efficiency. Pin functions are validated per Analog Devices Rev. D datasheet Table 7.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7091R-4BRUZ, the AD7091R-8BRUZ provides double the input channels in a larger 24-lead package, enabling full 8-sensor coverage without daisy-chaining. Versus ADS8688IPWR, it trades resolution for ultralow power and integrated reference - making it optimal for always-on, size- and energy-constrained edge nodes.

Availability

AD7091R-8BRUZ is available at Aetrix Electronics and suitable for battery-powered systems, industrial predictive maintenance sensors, and portable medical diagnostics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7091R-8BRUZ 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, founded in 1965 and headquartered in Wilmington, MA.

The AD7091R-8BRUZ belongs to the AD7091R family of ultralow-power SAR ADCs designed specifically for energy-constrained, multichannel data acquisition in portable and harsh-environment applications - emphasizing integration, configurability, and wide-temperature reliability.

FAQ

What is the maximum sampling rate supported by the AD7091R-8BRUZ?

The AD7091R-8BRUZ supports a maximum throughput rate of 1 MSPS, achieved with a minimum conversion cycle time of 1000 ns. This rate is maintained across its full operating temperature range (−40°C to +125°C) and supply voltage range (2.7 V to 5.25 V), with no pipeline latency or dead time between conversions - ensuring deterministic timing for real-time control loops and transient capture.

Does the AD7091R-8BRUZ require an external voltage reference?

No, the AD7091R-8BRUZ includes a highly accurate on-chip 2.5 V reference with 5 ppm/°C typical drift and ±10 mV initial tolerance. This internal reference can be used directly or overdriven with an external source (1.0 V to VDD). Using the internal reference eliminates the need for external reference ICs, reducing system cost, PCB area, and component count - a key advantage confirmed in the AD7091R-8BRUZ datasheet Rev. D specifications table.

How many analog input channels does the AD7091R-8BRUZ have, and what type are they?

The AD7091R-8BRUZ has eight single-ended analog input channels (VIN0 through VIN7), each with a 0 V to VREF input voltage range. These inputs are routed through an internal multiplexer to the shared ADC core, and channel selection is managed by the integrated programmable sequencer - enabling automatic, repeatable scanning without host processor intervention. This architecture is explicitly defined in the Functional Block Diagram and Pin Descriptions sections of the AD7091R-8BRUZ datasheet.

What is the power consumption of the AD7091R-8BRUZ in power-down mode?

In power-down mode, the AD7091R-8BRUZ draws 435 nA typical current at VDD = 3 V and 550 nA typical at VDD = 5.25 V, as specified in the Power Requirements table of the AD7091R-8BRUZ datasheet Rev. D. This ultralow quiescent current enables multi-year battery operation in wake-on-event sensor nodes, and the device wakes fully operational within microseconds upon CONVST assertion.

Can the AD7091R-8BRUZ interface directly with a 1.8 V microcontroller?

Yes, the AD7091R-8BRUZ supports independent VDRIVE supply ranging from 1.8 V to 5.25 V, allowing direct SPI communication with 1.8 V logic without level shifters. Its digital inputs accept VIH ≥ 0.7 × VDRIVE and VIL ≤ 0.3 × VDRIVE, and outputs drive VOH ≥ VDRIVE − 0.2 V and VOL ≤ 0.4 V - all verified in the Logic Inputs/Outputs section of the AD7091R-8BRUZ datasheet Rev. D.