Analog Devices Inc. EVAL-AD7691SDZ

Overview

EVAL-AD7691SDZ from Analog Devices is a dedicated evaluation board for the AD7691 - an 18-bit, 250 kSPS PulSAR® successive-approximation ADC in a 10-lead MSOP package. It provides full signal conditioning, on-board 5.0 V ADR435 reference, dual ADA4841-1 ADC drivers, and ±7.5 V/–2.5 V analog supply rails. Designed for precision DC and AC performance validation in metrology and data acquisition systems.

For engineers reviewing the EVAL-AD7691SDZ datasheet, EVAL-AD7691SDZ pinout, EVAL-AD7691SDZ application, or EVAL-AD7691SDZ equivalent, this page delivers verified hardware architecture, software workflow integration with EVAL-SDP-CB1Z, real-world FFT/SNR test capabilities, and configuration details for differential/single-ended input modes per AD7691's spec.

Technical Context

The EVAL-AD7691SDZ implements a complete analog front-end for the AD7691, featuring unity-gain buffered SMA inputs (J6/J10), midscale common-mode generation (VCM), and rail-splitting power circuitry using ADP7102 (+7.5 V), ADP2301 (–2.5 V), and ADP7104 (2.5 V/5 V). It supports both differential and single-ended configurations via solder link SL10.

It interfaces to the Analog Devices System Development Platform (EVAL-SDP-CB1Z) via a 120-pin connector and SPORT interface driven by ADSP-BF527 DSP. Level-shifting is not required for AD7691 since it operates at 5 V logic, unlike 8-lead variants requiring ADG3304 translation.

Key Specifications

Availability

EVAL-AD7691SDZ is available at Aetrix Electronics and suitable for precision data acquisition, industrial process monitoring, and portable instrumentation requiring stable component supply and validated ADC evaluation infrastructure.

Supply support for EVAL-AD7691SDZ 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.

This evaluation board belongs to Analog Devices' PulSAR® ADC evaluation platform family, designed specifically to accelerate prototyping and performance validation of precision SAR ADCs in test, measurement, and sensor interface applications.

FAQ

What is the primary function of the EVAL-AD7691SDZ?

The EVAL-AD7691SDZ is a dedicated evaluation board for the AD7691 18-bit, 250 kSPS PulSAR ADC. It provides calibrated analog signal conditioning, precision reference, configurable power rails, and seamless digital interfacing to the EVAL-SDP-CB1Z platform. The EVAL-AD7691SDZ enables full characterization - including FFT, histogram, and DC linearity tests - without external hardware setup beyond a low-distortion signal source and USB connection.

Which ADCs does the EVAL-AD7691SDZ support besides the AD7691?

The EVAL-AD7691SDZ is part of the 10-lead PulSAR evaluation platform and supports multiple 10-lead SAR ADCs including AD7685, AD7686, AD7687, AD7688, AD7690, AD7693, AD7942, AD7946, AD7980, AD7982, AD7983, AD7984, AD7988-5, AD7989-5, AD7915, and AD7916. However, the EVAL-AD7691SDZ board shipped with U1 populated as AD7691 and configured for its specific timing, reference, and input mode requirements.

Does the EVAL-AD7691SDZ require an external level shifter when used with EVAL-SDP-CB1Z?

No, the EVAL-AD7691SDZ does not require an external level shifter when interfacing with EVAL-SDP-CB1Z. Unlike 8-lead PulSAR variants (e.g., AD7683), the AD7691 operates with 5 V logic levels that are compatible with the SDP board's interface. The 10-lead board omits the ADG3304 level shifter found on the 8-lead version, simplifying signal integrity and eliminating translation-related timing skew for the EVAL-AD7691SDZ.

What power supplies are needed to operate the EVAL-AD7691SDZ?

The EVAL-AD7691SDZ operates from a single 9 V wall adapter (included), which powers on-board regulators: ADP7102 (+7.5 V), ADP2301 (–2.5 V), and ADP7104 (+2.5 V/+5 V/+3.3 V). Alternatively, bench supplies can be connected via screw terminals J2/J3, but solder links SL1, SL2, SL3, SL4, and SL7 must be reconfigured to 'B' position per UG-340 instructions to bypass internal regulation for the EVAL-AD7691SDZ.

Can the EVAL-AD7691SDZ be used without connecting hardware to the PC?

Yes, the EVAL-AD7691SDZ software supports standalone mode. When launched without hardware, it displays a connectivity warning and allows loading and analysis of previously saved .tsv files - including example datasets stored in C:\Program Files\Analog Devices\8 & 10 Lead PulSAR ADCs\Example files. This offline capability enables algorithm development, post-processing verification, and training workflows independent of physical EVAL-AD7691SDZ hardware.