Analog Devices Inc. EVAL-AD7985FMCZ

Overview

EVAL-AD7985FMCZ from Analog Devices is a fully featured evaluation board for the AD7985 16-bit, 2.5 MSPS PulSAR® SAR analog-to-digital converter. It integrates on-board ADR4550 (5.0 V) and ADR4525 (2.048 V) references, ADA4899-1/ADA4897-1 signal conditioning amplifiers, AD8031 reference buffers, and ADP7118/ADP2370/ADM7160 power regulators - enabling low-noise, high-fidelity ADC characterization in time and frequency domains.

For engineers reviewing the EVAL-AD7985FMCZ datasheet, EVAL-AD7985FMCZ pinout, EVAL-AD7985FMCZ application, or EVAL-AD7985FMCZ equivalent, this board supports USB-controlled waveform capture, FFT analysis, DC histogram testing, and configurable single/differential input paths via SMA connectors and jumper-selectable hardware links - all while interfacing directly with the EVAL-SDP-CH1Z system demonstration platform.

Technical Context

The EVAL-AD7985FMCZ implements a modular, FMC-LPC (VITA 57) compliant hardware architecture centered on the AD7985 ADC. Its analog front-end includes dual-path signal conditioning (single-ended or fully differential), selectable ±3.0 V/±2.5 V amplifier supplies, and programmable VCM generation from the ADR4550 reference.

Power delivery uses discrete regulators: ADP7118 generates +7.5 V for amplifier +VS and reference ICs; ADP2370 produces −3.0 V for amplifier −VS; ADM7160 supplies 2.5 V to ADC DVDD/VIO; and ADP7118 also provides 5 V to BVDD and reference circuitry - all derived from a 12 V input via the 160-pin FMC connector or external wall adapter.

Key Specifications

Availability

EVAL-AD7985FMCZ is available at Aetrix Electronics and suitable for precision data acquisition, medical instrumentation, industrial process control, and test & measurement applications requiring stable component supply and validated ADC evaluation infrastructure.

Supply support for EVAL-AD7985FMCZ 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-AD7985FMCZ belongs to Analog Devices' PulSAR® evaluation platform family, designed specifically to accelerate prototyping and performance validation of high-speed, low-power SAR ADCs in demanding signal chain applications.

FAQ

What is the primary function of the EVAL-AD7985FMCZ?

The EVAL-AD7985FMCZ is an evaluation board engineered to characterize the AD7985 16-bit, 2.5 MSPS SAR ADC under real-world conditions. It provides complete signal chain support - including configurable analog input paths, precision references, buffered reference drivers, regulated power rails, and USB-hosted software - enabling engineers to validate dynamic performance (SNR, THD, SFDR), DC accuracy, and interface timing without custom hardware design. The EVAL-AD7985FMCZ serves as a turnkey solution for rapid ADC integration assessment.

Which ADCs does the EVAL-AD7985FMCZ support?

The EVAL-AD7985FMCZ is explicitly designed for the AD7985 but shares full hardware compatibility with the AD7944 (14-bit, 2.5 MSPS) and AD7986 (18-bit, 2 MSPS) due to identical pinout, power architecture, and interface requirements. Jumper configurations (JP7, LK10, etc.) allow users to select the target device and configure reference, supply, and input path settings accordingly - making the EVAL-AD7985FMCZ a unified evaluation platform across the AD7944/AD7985/AD7986 family.

How does the EVAL-AD7985FMCZ connect to a host PC?

The EVAL-AD7985FMCZ connects to a host PC exclusively through the EVAL-SDP-CH1Z system demonstration platform, which acts as a USB-to-FPGA bridge. The EVAL-AD7985FMCZ mates to the EVAL-SDP-CH1Z via its 160-pin FMC-LPC connector (J7), while the EVAL-SDP-CH1Z itself connects to the PC via a standard USB cable. Communication is handled by Analog Devices' proprietary evaluation software, which controls ADC configuration, data capture, and analysis - no direct USB interface exists on the EVAL-AD7985FMCZ board itself.

What reference voltage options are available on the EVAL-AD7985FMCZ?

The EVAL-AD7985FMCZ offers three factory-supported reference options: 5.0 V (ADR4550), 2.048 V (ADR4525), and 1.2 V (ADR3412), all routed through the AD8031 reference buffer for low-noise drive. Jumpers LK2 and LK10 determine whether the internal ADC reference (4.096 V) or an external source is selected, while JP5 and LK7 configure VCM and REF buffer routing. The default configuration uses the 5.0 V ADR4550 with AD8031 buffering - delivering optimal SNR per the AD7985 datasheet.

Can the EVAL-AD7985FMCZ operate without the EVAL-SDP-CH1Z?

No - the EVAL-AD7985FMCZ has no standalone operation capability. It lacks onboard microcontroller, FPGA, or USB interface logic and relies entirely on the EVAL-SDP-CH1Z for digital control, clock generation, serial interface translation (LVCMOS ↔ SPI), and data streaming. All CNV, SCK, SDO, SDI, and TURBO signals are routed through level shifters to the EVAL-SDP-CH1Z's Spartan-6 FPGA. Without the EVAL-SDP-CH1Z, the EVAL-AD7985FMCZ cannot be powered, configured, or acquire data.