Analog Devices Inc. EVAL-AD7693SDZ

Overview

EVAL-AD7693SDZ from Analog Devices is an evaluation board for the AD7693 - a 16-bit, ±0.5 LSB max INL, 500 kSPS PulSAR® successive approximation ADC in 10-lead MSOP. It supports true differential analog inputs (±VREF), operates from single 5 V supply with 1.8–5 V logic interface, and enables high-accuracy data acquisition in battery-powered instrumentation and seismic systems.

For engineers reviewing the EVAL-AD7693SDZ datasheet, EVAL-AD7693SDZ pinout, EVAL-AD7693SDZ application, or EVAL-AD7693SDZ equivalent, this board provides full access to the AD7693's SPI-/QSPI™-/MICROWIRE™-compatible serial interface, daisy-chain capability, low-noise analog input path, and precise reference decoupling - critical for validating dynamic performance (96 dB SINAD, −120 dB THD) and timing behavior (1.6 μs conversion time).

Technical Context

The EVAL-AD7693SDZ implements the complete signal chain for the AD7693 ADC, including precision voltage reference buffering, matched differential analog input filtering, and configurable digital interface routing (CS or Chain mode). It integrates decoupling for REF (10 µF ceramic), VDD (100 nF + bulk), and VIO, with layout-optimized ground planes to preserve 96.5 dB dynamic range and minimize aperture jitter (2.5 ns).

Board-level design supports all AD7693 operational modes: true differential input (IN+/IN−), unipolar 0–VREF operation, and flexible reference sourcing (external VREF up to VDD). The PCB accommodates both 3-wire (with optional busy indicator) and 4-wire SPI configurations, and provides test points for CNV, SCK, SDI, SDO, and analog inputs to verify timing compliance per Table 4 (e.g., tCONV = 1.6 μs max, tDSDO ≤ 17 ns).

Key Specifications

Availability

EVAL-AD7693SDZ is available at Aetrix Electronics and suitable for precision data acquisition, portable medical instrumentation, and seismic sensor interface development requiring stable component supply and rapid prototyping support.

Supply support for EVAL-AD7693SDZ 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-AD7693SDZ belongs to Analog Devices' PulSAR® evaluation platform family, designed specifically to accelerate validation of precision SAR ADCs in high-fidelity, low-power, and multi-channel data acquisition systems.

FAQ

What is the primary function of the EVAL-AD7693SDZ?

The EVAL-AD7693SDZ is a dedicated evaluation board for the AD7693 16-bit SAR ADC. It provides a fully assembled, tested hardware platform with optimized layout, reference decoupling, analog input conditioning, and configurable digital interface to validate the AD7693's key specifications - including 500 kSPS throughput, ±0.5 LSB INL, 96 dB SINAD, and SPI-compatible serial operation - under real-world conditions before integration into end equipment.

Does the EVAL-AD7693SDZ support daisy-chaining multiple AD7693 devices?

Yes, the EVAL-AD7693SDZ supports daisy-chaining via the AD7693's native Chain mode. When SDI is held low at the CNV rising edge, the board configures the AD7693 to accept serial data on SDI and output concatenated results on SDO, enabling synchronized sampling across multiple ADCs on a single 3-wire bus - a capability verified in the AD7693 datasheet Rev. C timing diagrams and functional descriptions.

Can the EVAL-AD7693SDZ operate with a 1.8 V logic interface?

Yes, the EVAL-AD7693SDZ supports 1.8 V digital logic through its independent VIO supply connection. The board routes VIO to the AD7693's VIO pin (Pin 10), enabling full compatibility with 1.8 V, 2.5 V, 3 V, or 5 V host processors - as specified in AD7693 Table 2 and confirmed by the board's dual-rail power architecture and level-tolerant digital interface traces.

What reference voltage options are supported by the EVAL-AD7693SDZ?

The EVAL-AD7693SDZ accepts external reference voltages from 0.5 V to VDD (up to 5.5 V) on the REF pin, matching the AD7693's specified range. It includes a dedicated 10 µF X5R ceramic capacitor at the REF input and pad locations for optional reference buffers (e.g., ADR4550), supporting both ratiometric and absolute reference configurations per AD7693 datasheet Section "Voltage Reference Input".

Is the EVAL-AD7693SDZ pin-compatible with other PulSAR® evaluation boards?

No - the EVAL-AD7693SDZ is specifically laid out for the 10-lead MSOP package of the AD7693 and is not mechanically or electrically pin-compatible with evaluation boards for other PulSAR® devices (e.g., EVAL-AD7691SDZ). However, it shares design methodology and software compatibility with Analog Devices' System Development Platform (SDP) interface, enabling consistent firmware reuse across the AD769x family.