Analog Devices Inc. EVAL-AD7795EBZ

Overview

EVAL-AD7795EBZ from Analog Devices is a USB-powered evaluation board for the AD7795 16-bit, low-power, sigma-delta ADC with six differential analog inputs, on-board 3.3 V regulator (ADP3303ARZ-3.3), and integrated temperature demonstration circuit using a 1 kΩ thermistor and 5 kΩ precision reference resistor. It supports update rates from 4.17 Hz to 500 Hz and enables ratiometric temperature measurement at 16.7 Hz with 86 nV rms noise (gain = 64).

For engineers reviewing the EVAL-AD7795EBZ datasheet, EVAL-AD7795EBZ pinout, EVAL-AD7795EBZ application, or EVAL-AD7795EBZ equivalent, this board provides LabVIEW™-based PC software for register-level configuration, real-time sampling, histogram/waveform visualization, noise analysis, and temperature demo execution - all via standard USB interface without external power or clock required.

Technical Context

The EVAL-AD7795EBZ implements a complete hardware and software test environment for the AD7795, featuring an on-board Cypress CY7C68013A-56LFXC USB controller for SPI-to-USB bridging and a dedicated ADP3303ARZ-3.3 LDO supplying AVDD. It includes eight configurable jumpers (LK1–LK8) to select reference source, excitation current routing, bias voltage, and power supply path (USB 5 V, on-board 3.3 V, or external 3/5 V).

Signal connectivity is provided through four SMB connectors (AIN1+, AIN1−, REFIN1+, REFIN1−) and a 30-pin header (J2) for prototype interfacing. The board supports simultaneous 50 Hz/60 Hz rejection at 16.7 Hz update rate and enables full register access - including mode, configuration, status, offset, and full-scale calibration registers - via the bundled Windows® software.

Key Specifications

Availability

EVAL-AD7795EBZ 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, traceable sourcing, and long-term evaluation platform continuity.

Supply support for EVAL-AD7795EBZ 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-AD7795EBZ belongs to Analog Devices' precision data acquisition evaluation platform family, designed specifically to accelerate development of low-power, high-resolution measurement systems using their Σ-Δ ADC portfolio.

FAQ

Does EVAL-AD7795EBZ require an external power supply to operate?

No, EVAL-AD7795EBZ operates directly from the 5 V USB supply via connector J1. An external 3 V or 5 V source can be used via terminal block J3, but it is optional. The on-board ADP3303ARZ-3.3 regulator provides clean 3.3 V AVDD when LK8 is set to Position B, making EVAL-AD7795EBZ fully self-contained for bench evaluation without auxiliary power supplies.

What software is included with EVAL-AD7795EBZ and what functions does it support?

EVAL-AD7795EBZ ships with Windows®-based LabVIEW™-derived software that supports full register read/write (mode, configuration, IO, offset, full-scale), real-time sampling, noise analysis, histogram/waveform plotting, voltage/code conversion, and dedicated temperature demonstration mode. It also enables data export to Excel or MathCAD for post-processing - all without custom driver installation.

Can EVAL-AD7795EBZ evaluate the AD7795's low-side power switch functionality?

Yes, EVAL-AD7795EBZ supports direct testing of the AD7795's integrated low-side power switch via jumper LK7. When LK7 is installed, enabling the PWR SW bit in the IO register (via the Registers window) illuminates LED D2, providing visual confirmation and functional validation of the switch output - a capability confirmed in the board's schematic and user guide.

How is simultaneous 50 Hz and 60 Hz rejection achieved on EVAL-AD7795EBZ?

EVAL-AD7795EBZ achieves simultaneous 50 Hz/60 Hz rejection by configuring the AD7795 to its 16.7 Hz update rate - a setting that places notch filters at both frequencies due to the Σ-Δ modulator's inherent sinc³ filter response. This is enabled by default in the software and requires no hardware modification, delivering 86 nV rms noise performance with gain = 64.

Is the EVAL-AD7795EBZ compatible with other AD77xx-series ADCs?

No, EVAL-AD7795EBZ is specifically designed for the AD7795BRUZ and is not mechanically or electrically compatible with other AD77xx devices. Its layout, jumper configuration (e.g., LK2–LK6 for ratiometric temp demo), register mapping, and software are tailored exclusively to the AD7795's feature set, including its six-channel input structure, internal reference, and low-side switch - as documented in Rev. 0 of the board's user guide.