Analog Devices Inc. EVAL-AD7923CBZ

Overview

EVAL-AD7923CBZ from Analog Devices is an evaluation board for the AD7923 - a 12-bit, 4-channel, single-ended successive approximation register (SAR) analog-to-digital converter with integrated channel sequencer and SPI-compatible serial interface. It supports up to 200 kSPS throughput, operates from 2.7 V to 5.25 V AVDD, and features 70 dB min SNR at 50 kHz input frequency. Designed for precision data acquisition in industrial sensor interfaces and automotive ECUs.

For engineers reviewing the EVAL-AD7923CBZ datasheet, EVAL-AD7923CBZ pinout, EVAL-AD7923CBZ application, or EVAL-AD7923CBZ equivalent, this page delivers verified hardware configuration details, supported ADC operating modes, reference design integration guidance, and direct compatibility notes with the AD7923 IC - including sequencer control, VDRIVE logic-level flexibility, and TSSOP-16 footprint alignment.

Technical Context

The EVAL-AD7923CBZ implements a complete test platform for the AD7923 12-bit SAR ADC, providing access to all 16 pins of the TSSOP package, on-board REFIN decoupling (2.5 V ±1%), and configurable AVDD/VDRIVE supply rails (2.7–5.25 V). It enables full validation of the ADC's sequencer operation, dual input range selection (0–REFIN or 0–2×REFIN), and straight binary/twos complement output coding via the 12-bit control register.

Board-level design supports SPI/QSPI/MICROWIRE/DSP-compatible host interfacing with precise timing control: conversion initiated on CS falling edge, sampling synchronized to CS, and 12-bit result + 2-bit channel ID + 2 leading zeros clocked out on SCLK falling edges. The board includes AGND/PGND separation, dedicated analog and digital power planes, and layout optimized for <50 ps aperture jitter and >8 MHz full-power bandwidth.

Key Specifications

Availability

EVAL-AD7923CBZ is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive battery monitoring, motor control feedback loops, and portable instrumentation requiring stable component supply and rapid ADC evaluation capability.

Supply support for EVAL-AD7923CBZ 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 (DSP) technologies, headquartered in Norwood, MA, with over 50 years of innovation in precision data conversion and signal conditioning.

The EVAL-AD7923CBZ belongs to Analog Devices' precision ADC evaluation platform family, engineered specifically to accelerate development of low-power, multi-channel data acquisition systems in harsh environments - including automotive under-hood and industrial PLC applications.

FAQ

What is the primary function of the EVAL-AD7923CBZ evaluation board?

The EVAL-AD7923CBZ evaluation board is a fully assembled and tested platform designed exclusively to evaluate the AD7923 12-bit, 4-channel SAR ADC. It provides immediate access to all device pins, preconfigured power and reference circuitry (including 2.5 V ±1% REFIN), and layout-optimized signal paths to validate dynamic performance metrics such as SNR, THD, and channel-to-channel isolation. Engineers use EVAL-AD7923CBZ to verify sequencer operation, control register programming, and SPI interface timing before integrating the AD7923 into final designs.

Does the EVAL-AD7923CBZ support both 3 V and 5 V microcontroller interfaces?

Yes, the EVAL-AD7923CBZ supports both 3 V and 5 V host interfaces via the AD7923's VDRIVE feature. The board routes VDRIVE independently from AVDD, allowing users to set VDRIVE to either 3 V or 5 V to match the logic level of the connected processor - without altering AVDD. This ensures reliable DIN/DOUT signaling and eliminates level-shifter requirements when interfacing EVAL-AD7923CBZ with mixed-voltage systems.

Can the EVAL-AD7923CBZ be used to test the AD7923's channel sequencer functionality?

Yes, the EVAL-AD7923CBZ fully supports and enables validation of the AD7923's built-in 4-channel sequencer. By writing appropriate values to the SEQ1/SEQ0 and ADD1/ADD0 bits in the 12-bit control register via the SPI interface, users can configure continuous conversions across VIN0–VIN3 in programmable order (e.g., VIN0→VIN1→VIN2→VIN3→repeat). The board exposes all necessary control lines (CS, SCLK, DIN, DOUT) and provides test points for monitoring sequenced output data and timing behavior.

What reference voltage does the EVAL-AD7923CBZ provide for the AD7923?

The EVAL-AD7923CBZ supplies a precision 2.5 V reference to the AD7923's REFIN pin, meeting the ±1% tolerance required for specified performance per the AD7923 datasheet. This reference is internally decoupled with low-ESR ceramic capacitors and isolated from noisy digital supplies to maintain DC accuracy (±8 LSB offset error) and dynamic integrity (70 dB SNR). Users may also override this reference with an external source via the REFIN test point.

Is the EVAL-AD7923CBZ footprint compatible with other AD79xx-family evaluation boards?

No, the EVAL-AD7923CBZ uses a custom layout optimized for the AD7923's 16-lead TSSOP package and specific pinout (e.g., AGND on Pins 4, 8, 13, 16; VIN0–VIN3 on Pins 12–9). While it shares the same TSSOP-16 mechanical outline as other AD79xx devices, pin assignments differ significantly - for example, AD7924 places DOUT on Pin 14 but AD7923 uses Pin 14 for DOUT with identical mapping, yet control register structure and sequencer implementation are unique to AD7923. Cross-board reuse requires verification of signal routing and power domain partitioning.