Analog Devices Inc. EVAL-AD7739EBZ

Overview

EVAL-AD7739EBZ from Analog Devices is an evaluation board for the AD7739 24-bit sigma-delta analog-to-digital converter, designed to accelerate development of high-precision, multi-channel industrial data acquisition systems. It supports all 8 single-ended or 4 fully differential input configurations, ±0.625 V to ±2.5 V input ranges, and real-time system calibration - enabling rapid validation of 18-bit p-p resolution at 500 Hz or 16-bit p-p resolution at 4 kHz in PLC and process control applications.

For engineers reviewing the EVAL-AD7739EBZ datasheet, EVAL-AD7739EBZ pinout, EVAL-AD7739EBZ application, or EVAL-AD7739EBZ equivalent, this board provides full access to the AD7739's 3-wire SPI-compatible serial interface, on-board reference, configurable logic I/O (P0/P1), and hardware reset/sync controls - with direct connection to PC via USB-to-serial adapter for register-level configuration and real-time data streaming.

Technical Context

The EVAL-AD7739EBZ implements the complete signal chain for the AD7739 ADC, including precision buffered analog inputs, a stable 2.5 V reference, decoupled 5 V analog and 3 V/5 V digital supplies, and Schmitt-triggered logic interfaces. It exposes all 24 TSSOP pins via test points and headers, supporting both standalone operation and integration into larger systems via its 0.1"-spaced DIP-style connectors.

Board-level design enables immediate evaluation of key AD7739 features: per-channel system calibration, chopping-enabled offset drift reduction (<±25 nV/°C), and flexible conversion timing (250 µs to 2.7 ms) controlled via the channel conversion time register - all while maintaining true 24-bit no-missing-codes performance across –40°C to +105°C.

Key Specifications

Availability

EVAL-AD7739EBZ is available at Aetrix Electronics and suitable for industrial instrumentation, PLC/DCS development, and multiplexed sensor data acquisition requiring stable component supply, long-term design-in support, and traceable evaluation hardware sourcing.

Supply support for EVAL-AD7739EBZ 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-AD7739EBZ belongs to Analog Devices' precision data acquisition evaluation platform family, engineered specifically to simplify prototyping and validation of high-resolution, multi-channel sigma-delta ADCs in harsh industrial environments.

FAQ

What is the primary function of the EVAL-AD7739EBZ?

The EVAL-AD7739EBZ is an evaluation board designed exclusively for the AD7739 24-bit sigma-delta ADC. It provides a fully populated, tested hardware platform with accessible test points, headers, and interface circuitry to enable rapid characterization, register-level configuration, and system-level integration testing of the AD7739 - including its 8-channel analog front end, programmable gain, and on-chip calibration features.

Does the EVAL-AD7739EBZ include a power supply or require external power?

The EVAL-AD7739EBZ does not include an onboard power supply and requires external 5 V analog (AVDD) and 3 V or 5 V digital (DVDD) supplies. It features screw terminals and pin headers for clean, low-noise connection of these supplies, with separate AGND and DGND planes to maintain signal integrity - consistent with the AD7739's specified operating conditions and isolation requirements.

Can the EVAL-AD7739EBZ be used to evaluate both chopping enabled and chopping disabled modes of the AD7739?

Yes, the EVAL-AD7739EBZ fully supports both chopping modes of the AD7739. The board routes all necessary control signals (including MCLKIN, RESET, SYNC/P1, and CS) to allow software configuration of the chop bit in the AD7739's mode register. This enables direct comparison of noise performance (e.g., 18-bit p-p at 500 Hz with chopping) versus throughput (e.g., 16-bit p-p at 4 kHz without chopping) using identical hardware.

Is the EVAL-AD7739EBZ compatible with standard PC interfaces?

The EVAL-AD7739EBZ interfaces with a PC via an external USB-to-serial adapter (not included) connected to its UART-compatible header. This allows communication with Analog Devices' evaluation software (e.g., ACE - Analysis, Control, Evaluation) to configure registers, stream conversion data, and perform real-time analysis - without requiring custom drivers or FPGA-based host controllers.

Does the EVAL-AD7739EBZ support differential reference input and no-reference detection?

Yes, the EVAL-AD7739EBZ implements the AD7739's differential reference architecture with dedicated REFIN(+) and REFIN(–) connections tied to its on-board 2.5 V reference. The board preserves the AD7739's no-reference detect capability: when REFIN(–) falls below 0.5 V, the NOREF bit in the channel status register is asserted - a condition observable via serial readback during evaluation.