Analog Devices Inc. EVAL-AD7124-8ASDZ

Overview

EVAL-AD7124-8ASDZ from Analog Devices is an evaluation board for the AD7124-8, a low-noise, 24-bit sigma-delta ADC with integrated PGA, reference, excitation currents, and diagnostics. It supports 8 differential or 15 pseudo-differential inputs, three power modes (low/mid/full), and simultaneous 50/60 Hz rejection at 25 SPS - enabling high-precision sensor measurement in industrial process control, temperature/pressure monitoring, and smart transmitters.

For engineers reviewing the EVAL-AD7124-8ASDZ datasheet, EVAL-AD7124-8ASDZ pinout, EVAL-AD7124-8ASDZ application, or EVAL-AD7124-8ASDZ equivalent, this board provides full hardware access to all AD7124-8 features including SPI/QSPI/MICROWIRE interface, programmable gain (1–128), internal bandgap reference (10 ppm/°C drift), on-chip temperature sensor (±0.5°C), and diagnostic functions supporting SIL certification.

Technical Context

The EVAL-AD7124-8ASDZ implements the complete AD7124-8 signal chain: crosspoint multiplexed analog inputs, rail-to-rail buffered front-end, 24-bit Σ-Δ modulator with sinc3/sinc4/fast-settling filters, and dual LDOs (1.8 V and 1.9 V) for analog/digital domain isolation. It exposes all 32 pins of the AD7124-8's LFCSP package via test points and headers, including dedicated AINx/IOUT/VBIAS pins, REFOUT/REFIN, DOUT/RDY, CS, SCLK, DIN, and GPOs.

Board-level design integrates excitation current routing, burnout detection paths, low-side power switch control, and configurable bias voltage generation - all validated for operation across −40°C to +125°C. The onboard crystal oscillator (614.4 kHz) and optional external clock input support precise timing control for noise-sensitive applications like RTD or thermocouple measurement.

Key Specifications

Availability

EVAL-AD7124-8ASDZ is available at Aetrix Electronics and suitable for industrial process control, precision temperature measurement, and automotive sensor development requiring stable component supply and full-featured evaluation capability.

Supply support for EVAL-AD7124-8ASDZ 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 technologies, serving industrial, automotive, communications, and healthcare markets.

The EVAL-AD7124-8ASDZ belongs to Analog Devices' precision data acquisition evaluation platform family, designed to accelerate development of high-integrity sensor interfaces for safety-critical and metrology-grade applications.

FAQ

What is the primary function of the EVAL-AD7124-8ASDZ evaluation board?

The EVAL-AD7124-8ASDZ is a fully assembled and tested evaluation platform for the AD7124-8 24-bit sigma-delta ADC. It enables rapid prototyping and characterization of the device's key capabilities - including low-noise measurement (24 nV rms), programmable gain (1–128), simultaneous 50/60 Hz rejection, and integrated diagnostics - without requiring custom PCB design. The board provides direct access to all AD7124-8 pins and supports both internal and external reference configurations.

Does the EVAL-AD7124-8ASDZ support all AD7124-8 power modes and filter options?

Yes, the EVAL-AD7124-8ASDZ fully supports all three AD7124-8 power modes (low, mid, full) and all documented digital filter configurations - including sinc3, sinc4, fast-settling (sinc4+sinc1), and post-filters - via software configuration through the provided evaluation software (AD7124-8 Evaluation Software). Each mode delivers its specified RMS noise, data rate range, and current consumption as defined in the AD7124-8 datasheet Rev. F.

Can the EVAL-AD7124-8ASDZ be used for AEC-Q100 qualified automotive designs?

Yes - the EVAL-AD7124-8ASDZ evaluates the AD7124-8 W grade, which is AEC-Q100 qualified for automotive applications (Grade 1: −40°C to +125°C). The board's layout, power delivery, and thermal design comply with requirements for validating automotive sensor interface performance, including diagnostic coverage for functional safety (SIL-2/3 per IEC 61508 FMEDA).

What interface protocols does the EVAL-AD7124-8ASDZ support for communicating with the host system?

The EVAL-AD7124-8ASDZ supports standard 3-wire and 4-wire SPI communication with the AD7124-8, and is compatible with QSPI™, MICROWIRE™, and DSP interfaces. It uses the AD7124-8's native serial protocol with CS, SCLK, DIN, DOUT/RDY signals routed to a 14-pin header, allowing connection to microcontrollers, FPGAs, or PC-based USB-SPI adapters using the included evaluation software.

Does the EVAL-AD7124-8ASDZ include hardware support for sensor excitation and burnout detection?

Yes - the EVAL-AD7124-8ASDZ routes the AD7124-8's integrated excitation current sources (0.1–1000 µA, ±4% initial tolerance) and burnout detection circuitry to dedicated test points and screw terminals. It supports 2-, 3-, and 4-wire RTD configurations, thermocouple cold-junction compensation, and bridge sensor power-down via the low-side switch - all controllable through register writes to the AD7124-8 on the EVAL-AD7124-8ASDZ.