Analog Devices Inc. EVAL-AD7688SDZ

Overview

EVAL-AD7688SDZ from Analog Devices is a dedicated evaluation board for the AD7688 - a 16-bit, 100 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, and dual-rail ±7.5 V/–2.5 V analog supply generation. Designed for precision DC and AC performance validation of the AD7688 in differential or single-ended input configurations.

For engineers reviewing the EVAL-AD7688SDZ datasheet, EVAL-AD7688SDZ pinout, EVAL-AD7688SDZ application, or EVAL-AD7688SDZ equivalent, this board serves as a production-ready test platform compatible with the EVAL-SDP-CB1Z system demonstration platform, supporting FFT-based SNR/SINAD/THD analysis, histogram testing, and time-domain waveform capture - all via USB-connected PC software.

Technical Context

The EVAL-AD7688SDZ implements a complete analog front-end optimized for 16-bit PulSAR ADCs: it delivers low-noise ±7.5 V/–2.5 V rails using ADP7102 and ADP2301 regulators, buffers the ADR435 5.0 V reference for stable VREF, and conditions inputs via two ADA4841-1 op amps configured as unity-gain buffers at factory default. The board supports both differential and single-ended analog input modes via configurable solder links (SL10).

It interfaces to the EVAL-SDP-CB1Z via a 120-pin connector using SPORT protocol, with level-shifting logic (ADG3304 on 8-lead variant only - not used for AD7688) and clock gating (U9–U11 AND gates). Power is supplied either by included 9 V wall adapter or external bench supply via screw terminals J2/J3.

Key Specifications

Availability

EVAL-AD7688SDZ is available at Aetrix Electronics and suitable for precision data acquisition, sensor signal conditioning, and industrial instrumentation applications requiring stable component supply and validated ADC characterization workflows.

Supply support for EVAL-AD7688SDZ 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-AD7688SDZ belongs to Analog Devices' PulSAR® evaluation platform family, designed specifically to accelerate prototyping and performance validation of their precision SAR ADC portfolio - emphasizing low power, high resolution, and ease of system integration.

FAQ

What is the primary function of the EVAL-AD7688SDZ?

The EVAL-AD7688SDZ is an evaluation board purpose-built to characterize the AD7688 16-bit, 100 kSPS PulSAR ADC. It provides calibrated analog signal conditioning, precision reference, regulated dual-rail supplies, and seamless interface to the EVAL-SDP-CB1Z for PC-based data capture and analysis - enabling engineers to validate dynamic performance (SNR, SINAD, THD) and DC accuracy before system integration. The EVAL-AD7688SDZ does not operate standalone and requires the SDP board and Analog Devices' evaluation software.

Which ADCs are supported by the EVAL-AD7688SDZ?

The EVAL-AD7688SDZ is part of the 10-lead PulSAR evaluation platform and supports multiple 10-lead SAR ADCs including the AD7688, AD7685, AD7686, AD7687, AD7690, AD7691, AD7693, AD7980, AD7982, AD7983, AD7984, AD7988-5, AD7989-5, AD7915, and AD7916. Its hardware configuration (e.g., SL10 jumper setting) must match the target ADC's input mode - differential for AD7688 - per UG-340 Table 3.

Does the EVAL-AD7688SDZ include its own power supply?

Yes, the EVAL-AD7688SDZ includes an integrated power supply circuitry that derives all required voltages from a 9 V wall adapter: +7.5 V (ADP7102), –2.5 V (ADP2301), +5 V (ADP2301), +2.5 V/+5 V (ADP7104), and +3.3 V (ADP7104). It also supports external bench supply via screw terminals J2/J3, requiring solder link reconfiguration (SL1 = B, SL2 = B, SL3 = B, SL7 = B, SL4 = B) as specified in UG-340 Page 4.

How is the EVAL-AD7688SDZ connected to a PC?

The EVAL-AD7688SDZ connects to a PC indirectly via the EVAL-SDP-CB1Z system demonstration platform, which plugs into the host PC using a standard USB A-to-Mini-B cable. The EVAL-AD7688SDZ attaches to the SDP board via its 120-pin edge connector (J5). Software installation must precede hardware connection to ensure proper driver recognition - the Analog Devices 8 & 10 Lead PulSAR ADCs GUI detects the EVAL-AD7688SDZ automatically when powered and linked through the SDP.

Can the EVAL-AD7688SDZ be used without the EVAL-SDP-CB1Z?

No - the EVAL-AD7688SDZ lacks native USB or direct PC interface capability and relies entirely on the EVAL-SDP-CB1Z for digital communication, clock generation (SCLK), and power delivery (VSDP, 3.3 V, 5 V). The SDP board hosts the ADSP-BF527 DSP and SPORT interface logic required to control the AD7688 and stream captured data. Without the EVAL-SDP-CB1Z, the EVAL-AD7688SDZ cannot perform data acquisition or interact with the evaluation software.