Analog Devices Inc. EVAL-AD7687SDZ

Overview

EVAL-AD7687SDZ from Analog Devices is a dedicated evaluation board for the AD7687 - a 16-bit, 250 kSPS PulSAR® successive-approximation ADC in a 10-lead MSOP package. It provides full signal chain support including on-board ADR435 5.0 V reference, ADA4841-1 ADC drivers, ±7.5 V/–2.5 V analog supply rails, and SMA-input analog conditioning for differential or single-ended operation.

For engineers reviewing the EVAL-AD7687SDZ datasheet, EVAL-AD7687SDZ pinout, EVAL-AD7687SDZ application, or EVAL-AD7687SDZ equivalent, this board serves as a validated hardware platform to characterize dynamic performance (SNR, SINAD, THD, SFDR), evaluate dc accuracy (INL/DNL), validate SPI-compatible serial interface timing, and prototype with real-world analog sources up to 1.33 MSPS-capable PulSAR ADCs.

Technical Context

The EVAL-AD7687SDZ implements a modular, dual-path analog front-end supporting both differential and single-ended input configurations via factory-set solder links (SL10). It interfaces with the Analog Devices System Development Platform (EVAL-SDP-CB1Z) through a 120-pin connector using SPORT-based serial communication, with level-shifting (ADG3304) for 5 V ADC logic to 3.3 V SDP compatibility.

Power is derived from a 9 V wall adapter or bench supply, generating regulated +7.5 V, –2.5 V, +5 V, +3.3 V, and +2.5 V rails via ADP7102, ADP2301, ADP7104, and ADP2301 ICs. The board includes unity-gain buffered amplifiers (ADA4841-1), midscale common-mode generation (VCM), and decoupled ground planes to preserve 16-bit integrity during FFT and histogram testing.

Key Specifications

Availability

EVAL-AD7687SDZ is available at Aetrix Electronics and suitable for precision data acquisition, sensor signal conditioning, industrial process monitoring, and medical instrumentation requiring stable component supply and rapid ADC validation.

Supply support for EVAL-AD7687SDZ 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-AD7687SDZ belongs to Analog Devices' PulSAR® evaluation platform family, designed specifically to accelerate development and characterization of low-power, high-accuracy SAR ADCs used in precision measurement systems.

FAQ

What is the primary ADC supported by the EVAL-AD7687SDZ?

The EVAL-AD7687SDZ is specifically configured and optimized for the AD7687 - a 16-bit, 250 kSPS PulSAR® successive-approximation ADC in a 10-lead MSOP package. While it supports multiple 8-/10-lead PulSAR ADCs, the board's default jumper settings (SL10 = A), analog input scaling, and software calibration are aligned to the AD7687's differential input architecture and timing requirements. The EVAL-AD7687SDZ delivers verified performance metrics for the AD7687 out of the box.

Does the EVAL-AD7687SDZ require an external SDP board to operate?

Yes - the EVAL-AD7687SDZ requires the EVAL-SDP-CB1Z system demonstration platform board to establish USB connectivity, power distribution, and SPORT-based serial communication with the host PC. The EVAL-AD7687SDZ connects to the EVAL-SDP-CB1Z via a 120-pin edge connector (J5), and its firmware/software stack is built exclusively for that interface. Without the EVAL-SDP-CB1Z, the EVAL-AD7687SDZ cannot perform live data capture or control.

Can the EVAL-AD7687SDZ be powered from a bench supply instead of the included wall adapter?

Yes - the EVAL-AD7687SDZ supports bench power via screw terminals J2 (+VS) and J3 (–VS/GND). To use bench supplies, five solder links must be reconfigured: SL1 = B, SL2 = B, SL3 = B, SL4 = B, and SL7 = B. This bypasses the on-board ADP2301/ADP7102/ADP7104 regulators and routes external voltage directly to the respective rail inputs. The board retains full functionality, including reference buffering and ADC driver operation, under bench power.

What analog input configuration does the EVAL-AD7687SDZ use by default for the AD7687?

By default, the EVAL-AD7687SDZ is factory-configured for differential analog input operation with the AD7687, per Table 3 in UG-340 (SL10 = A). This enables full utilization of the AD7687's differential input range (±VREF), common-mode rejection, and optimal dynamic performance. The input path uses two ADA4841-1 op amps as unity-gain buffers, with midscale VCM biasing and ±7.5 V/–2.5 V rails to support the AD7687's specified input swing.

Which software tools are compatible with the EVAL-AD7687SDZ?

The EVAL-AD7687SDZ uses Analog Devices' proprietary Windows-based evaluation software, installed from C:\Program Files\Analog Devices\8 & 10 Lead PulSAR ADCs. It supports real-time waveform capture, FFT analysis (reporting SNR, SINAD, THD, SFDR), dc/ac histogram testing, summary tab reporting, and .tsv file export. The software auto-detects the connected ADC (e.g., AD7687) and configures sampling frequency, SCLK, and reference voltage accordingly - no third-party tools or custom drivers are required.