Analog Devices Inc. EVAL-AD7799EBZ

Overview

EVAL-AD7799EBZ from Analog Devices is a USB-powered evaluation board designed exclusively for the AD7799 24-bit, low-power, sigma-delta ADC with three differential analog input channels, on-board 3.3 V regulator (ADP3303ARZ-3.3), and integrated temperature demonstration circuit using a 1 kΩ thermistor and 5 kΩ precision resistor.

For engineers reviewing the EVAL-AD7799EBZ datasheet, EVAL-AD7799EBZ pinout, EVAL-AD7799EBZ application, or EVAL-AD7799EBZ equivalent, this board enables rapid functional validation of the AD7799's ratiometric measurement capability, 16.7 Hz update rate at 65 nV rms noise, simultaneous 50/60 Hz rejection, and low-side power switch control - all via LabVIEW-based PC software without external clocking or power supplies.

Technical Context

The EVAL-AD7799EBZ implements a complete signal chain interface for the AD7799, including SMB connectors for AIN1(±) and REFIN(±), an 18-pin header (J2) for custom prototyping, and configurable link options (LK1–LK10) to select reference source (AVDD/2 or external), power path (USB 5 V, ADP3303 3.3 V, or external 3/5 V), and enable/disable the on-chip low-side power switch for LED D2 control.

It integrates a Cypress CY7C68013A-56LFXC USB controller for SPI-to-USB bridging, a Microchip 24LC64 EEPROM for configuration storage, and supports both standalone noise analysis (via AIN1 shorted to AVDD/2) and ambient temperature measurement (via thermistor on AIN2 with ratiometric reference).

Key Specifications

Availability

EVAL-AD7799EBZ is available at Aetrix Electronics and suitable for precision sensor evaluation, industrial data acquisition prototyping, and low-frequency analog front-end validation requiring stable component supply, RoHS-compliant evaluation hardware, and full technical documentation support.

Supply support for EVAL-AD7799EBZ 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, serving industrial, communications, automotive, and healthcare markets since 1965.

The EVAL-AD7799EBZ belongs to Analog Devices' precision data converter evaluation platform family, engineered to accelerate development of low-noise, low-power, high-resolution measurement systems for weigh scales, medical instrumentation, and environmental monitoring.

FAQ

What is the primary function of the EVAL-AD7799EBZ?

The EVAL-AD7799EBZ is a dedicated evaluation board for the AD7799 24-bit sigma-delta ADC. It provides full hardware and software infrastructure-including USB interface, configurable links, SMB analog inputs, and LabVIEW-based control-to validate the AD7799's performance in low-frequency, high-precision applications without requiring custom PCB design. The EVAL-AD7799EBZ enables immediate testing of gain, update rate, reference configuration, and low-side switch functionality out-of-the-box.

Does the EVAL-AD7799EBZ require an external power supply?

No - the EVAL-AD7799EBZ is fully powered via the USB Mini-B connector (J1), delivering 5 V to both the board and the AD7799. An on-board ADP3303ARZ-3.3 regulator generates a clean 3.3 V supply for the ADC when LK9 is set to Position B. External power via J3 is optional and only needed for specific test conditions outside USB power limits. The EVAL-AD7799EBZ operates stand-alone with no additional power sources required.

How does the EVAL-AD7799EBZ support temperature measurement?

The EVAL-AD7799EBZ supports ambient temperature measurement using an on-board 1 kΩ thermistor (R1) and 5 kΩ precision resistor (R2/R24/R25) connected to AIN2(±) and REFIN(±). When links LK3–LK6 are installed, this forms a ratiometric circuit referenced to AVDD. The included Temp Demo software configures the AD7799 for AIN2 channel, gain = 1, and converts raw codes to temperature using an internal lookup table - all validated on the EVAL-AD7799EBZ without external components.

Can the EVAL-AD7799EBZ be used for noise analysis?

Yes - the EVAL-AD7799EBZ supports direct noise analysis by shorting AIN1(+) and AIN1(−) to AVDD/2 using links LK1 and LK2. With default settings (gain = 64, update rate = 16.7 Hz), the AD7799 achieves 65 nV rms noise, measurable via the software's Sample and Histogram functions. The EVAL-AD7799EBZ provides calibrated, repeatable conditions for quantifying input-referred noise, ENOB, and effective resolution under real-world layout and supply conditions.

Is the EVAL-AD7799EBZ compatible with modern Windows operating systems?

Yes - the EVAL-AD7799EBZ software is built on LabVIEW and supports Windows 7 through Windows 11 (32- and 64-bit). Installation requires the original CD-ROM or Analog Devices' archived software package; driver signing may require temporary Secure Boot disablement on newer UEFI systems. All core functionality - register access, continuous sampling, Temp Demo, and Excel export - operates identically across supported OS versions on the EVAL-AD7799EBZ.