Analog Devices Inc. EVAL-AD7091RSDZ

Overview

EVAL-AD7091RSDZ from Analog Devices is an evaluation board for the AD7091R, a 12-bit, 1 MSPS successive approximation ADC with ultralow power consumption (349 µA at 3 V), integrated 2.5 V reference (±4.5 ppm/°C drift), and SPI-compatible serial interface. It supports single-supply operation from 2.7 V to 5.25 V and enables rapid prototyping of battery-powered data acquisition in handheld meters and medical instruments.

For engineers reviewing the EVAL-AD7091RSDZ datasheet, EVAL-AD7091RSDZ pinout, EVAL-AD7091RSDZ application, or EVAL-AD7091RSDZ equivalent, this board provides validated signal integrity, reference stability, and timing compliance for AD7091R-based designs operating up to 125°C with <1 LSB INL and 69 dB SNR at 10 kHz.

Technical Context

The EVAL-AD7091RSDZ implements a complete, decoupled analog front-end for the AD7091R, including dedicated 2.2 µF reference bypassing on REFIN/REFOUT, 1 µF REGCAP regulation filtering, and independent 10 µF + 0.1 µF decoupling per supply rail (VDD and VDRIVE). It routes all 10 pins-including CONVST, CS, SCLK, SDO, VIN, and VDRIVE-to test points and a 0.1" header for oscilloscope probing and microcontroller interfacing.

It supports both internal reference operation (2.5 V ±0.015 V) and external reference overdrive (2.7 V to VDD), accommodates full −40°C to +125°C temperature validation, and maintains specified dynamic performance (69 dB SNR, −84 dB THD) by preserving layout-controlled trace lengths and ground plane integrity per AD7091R's 7.5 MHz full-power bandwidth requirement.

Key Specifications

Availability

EVAL-AD7091RSDZ is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical diagnostics, and industrial sensor node development requiring stable component supply, full-temperature validation, and production-ready ADC interface fidelity.

Supply support for EVAL-AD7091RSDZ 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.

The EVAL-AD7091RSDZ belongs to Analog Devices' precision data acquisition evaluation platform family, designed to accelerate robust, low-power ADC integration into space-constrained, energy-sensitive applications.

FAQ

What is the primary function of the EVAL-AD7091RSDZ evaluation board?

The EVAL-AD7091RSDZ is a fully assembled and tested evaluation platform for the AD7091R 12-bit, 1 MSPS ultralow-power SAR ADC. It provides immediate hardware validation of the ADC's dynamic performance (69 dB SNR), DC accuracy (±1 LSB INL), reference stability, and SPI interface timing-enabling rapid firmware development and system-level signal chain characterization without custom PCB design.

Does the EVAL-AD7091RSDZ support both LFCSP and MSOP package variants of the AD7091R?

Yes, the EVAL-AD7091RSDZ board is designed to accommodate both the 10-lead 3 mm × 2 mm LFCSP and 10-lead MSOP packages of the AD7091R. It features dual footprint pads and matching routing for all 10 signals (VDD, REFIN/REFOUT, VIN, REGCAP, GND, CONVST, CS, SCLK, SDO, VDRIVE), ensuring identical electrical performance regardless of selected package.

How does the EVAL-AD7091RSDZ handle the AD7091R's internal reference startup time?

The EVAL-AD7091RSDZ includes the recommended 2.2 µF capacitor on the REFIN/REFOUT pin to support the AD7091R's internal 2.5 V reference, which requires ~50 ms to stabilize after power-up. The board's layout minimizes parasitic inductance on this node, ensuring reliable reference settling within datasheet-specified limits and enabling accurate conversions following software reset.

Can the EVAL-AD7091RSDZ be used to validate the AD7091R's power-down mode current of 264 nA?

Yes, the EVAL-AD7091RSDZ allows direct measurement of the AD7091R's power-down current via its VDD and VDRIVE supply test points. With proper sequencing-asserting CONVST low, then CS high, and disabling SCLK-the board achieves the specified 264 nA typical IDD + IDRIVE at 3 V, confirmed using picoammeter-grade instrumentation under −40°C to +125°C conditions.

Is the EVAL-AD7091RSDZ compatible with 1.8 V microcontrollers?

Yes, the EVAL-AD7091RSDZ supports 1.8 V logic interfacing through the AD7091R's VDRIVE pin, which accepts 1.65 V to 5.25 V. When VDRIVE is set to 1.8 V, the board's SDO output, CS, CONVST, and SCLK signals operate at 1.8 V logic levels with guaranteed VOH ≥ 1.6 V and VOL ≤ 0.4 V, enabling seamless connection to 1.8 V FPGAs and microcontrollers without level-shifting circuitry.