Analog Devices Inc. EVAL-AD7091R-5SDZ

Overview

EVAL-AD7091R-5SDZ from Analog Devices is an evaluation board for the AD7091R-5 - a 12-bit, 4-channel, I²C-compatible, ultra-low-power successive approximation ADC. It operates from 2.7 V to 5.25 V, delivers 68 dB SNR at 1 kHz input, supports autocycle and command modes, and targets battery-powered data acquisition in medical instruments and portable diagnostics.

For engineers reviewing the EVAL-AD7091R-5SDZ datasheet, EVAL-AD7091R-5SDZ pinout, EVAL-AD7091R-5SDZ application, or EVAL-AD7091R-5SDZ equivalent, this board enables rapid validation of the AD7091R-5's I²C interface timing, channel sequencing, ALERT/BUSY signaling, low-power operation (90 µW typical), and on-chip 2.5 V reference performance under real-world signal conditioning conditions.

Technical Context

The EVAL-AD7091R-5SDZ provides full hardware access to all 20 pins of the AD7091R-5 in both 20-lead LFCSP and TSSOP packages, including dedicated test points for MUXOUT/ADCIN signal conditioning paths, configurable AS0/AS1 address pins, and independent decoupling for VDD, VDRIVE, and REFIN/REFOUT. It implements the recommended 2.2 µF capacitor on REGCAP and supports external reference injection via the REFIN/REFOUT node.

Board-level design includes pull-up resistors for SDA/SCL compliant with I²C fast mode (400 kHz), reset circuitry with debounced RESET input, and jumper-selectable power domains for VDD (2.7–5.25 V) and VDRIVE (1.8–5.25 V). The layout maintains analog-digital separation and exposes the EPAD for thermal grounding per Analog Devices' thermal resistance specs (θJA = 52°C/W for LFCSP).

Key Specifications

Availability

EVAL-AD7091R-5SDZ is available at Aetrix Electronics and suitable for battery-powered systems, portable medical instrumentation, and optical sensor signal chain prototyping requiring stable component supply and documented reference design validation.

Supply support for EVAL-AD7091R-5SDZ 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 Norwood, MA, with R&D and manufacturing infrastructure spanning North America, Europe, and Asia.

The EVAL-AD7091R-5SDZ belongs to Analog Devices' precision data acquisition evaluation platform family, designed specifically to accelerate development of ultra-low-power, multi-channel sensor interfaces for space-constrained, energy-sensitive applications.

FAQ

What is the primary function of the EVAL-AD7091R-5SDZ evaluation board?

The EVAL-AD7091R-5SDZ is a fully assembled and tested evaluation platform for the AD7091R-5 12-bit, 4-channel, I²C-compatible SAR ADC. It enables engineers to validate conversion accuracy, I²C timing compliance, channel sequencing behavior, ALERT/BUSY response, and low-power operation (down to 90 µW) without custom PCB design. The board supports both LFCSP and TSSOP package variants of the AD7091R-5 and provides direct access to all critical analog and digital signals required for system-level integration testing.

Does the EVAL-AD7091R-5SDZ support external reference voltage input?

Yes, the EVAL-AD7091R-5SDZ supports external reference voltage input via the REFIN/REFOUT pin of the AD7091R-5. The board provides a dedicated header and test point for injecting an external reference between 1.0 V and VDD, allowing users to evaluate performance trade-offs between the internal 2.5 V reference (5 ppm/°C drift) and higher-precision external sources. Decoupling provisions follow Analog Devices' recommendation of a 2.2 µF capacitor at this node.

Can the EVAL-AD7091R-5SDZ be used to verify the AD7091R-5's autocycle mode functionality?

Yes, the EVAL-AD7091R-5SDZ fully supports verification of the AD7091R-5's autocycle mode. Jumper-configurable AS0/AS1 pins allow selection of unique I²C addresses, while onboard firmware-ready headers and GPIO test points (GPO0, GPO1, GPO2) enable control and monitoring of mode transitions. The board's pre-routed MUXOUT/ADCIN path and channel-specific VIN0–VIN3 inputs let users confirm sequential conversion timing (90–880 µs depending on setting) and channel-to-channel isolation (−105 dB typical) as specified in the AD7091R-5 datasheet.

What power supply configurations does the EVAL-AD7091R-5SDZ support for the AD7091R-5?

The EVAL-AD7091R-5SDZ supports independent power domains for VDD (2.7–5.25 V) and VDRIVE (1.8–5.25 V), each with dedicated jumpers, filtering capacitors, and test points. This allows precise validation of the AD7091R-5's dual-supply operation - including scenarios where VDRIVE differs from VDD (e.g., 3.3 V logic with 5 V analog rail). Total power dissipation measurements (e.g., 90 µW typical at 3 V) can be directly verified using the board's shunt resistor measurement points and current-sense headers.

Is thermal management addressed on the EVAL-AD7091R-5SDZ for high-temperature operation?

Yes, the EVAL-AD7091R-5SDZ incorporates thermal design aligned with the AD7091R-5's specifications: the exposed pad (EPAD) of both LFCSP and TSSOP footprints is connected to a large copper pour tied to GND, matching Analog Devices' recommendation for θJA = 52°C/W (LFCSP) and 84.3°C/W (TSSOP). The board uses 2-oz copper and thermal vias under the IC footprint, enabling validated operation across the full −40°C to +125°C junction temperature range specified for the AD7091R-5.