Analog Devices Inc. EVAL-AD7622EDZ

Overview

EVAL-AD7622EDZ from Analog Devices is an evaluation board designed for the AD7622 - a 16-bit, 2 MSPS PulSAR® successive approximation register (SAR) analog-to-digital converter with differential unipolar 0 V to 2.5 V input range, parallel/serial interface, and on-chip reference buffer. It enables rapid characterization of dynamic performance (SNR, SINAD, THD, SFDR) and DC accuracy (transition noise, histogram) in data acquisition and precision instrumentation systems.

For engineers reviewing the EVAL-AD7622EDZ datasheet, EVAL-AD7622EDZ pinout, EVAL-AD7622EDZ application, or EVAL-AD7622EDZ equivalent, this board supports stand-alone operation or integration with the EVAL-CED1Z USB capture board, offers configurable analog signal conditioning, on-board 40 MHz clock oscillator, buffered 16-bit parallel outputs (BD[0:15]), and serial interface test points (SDOUT, SCLK, SYNC) - all critical for ADC validation, firmware co-development, and system-level timing alignment.

Technical Context

The EVAL-AD7622EDZ implements a 4-layer PCB layout with separated analog and digital ground planes joined directly under the ADC to minimize coupling. It uses a Xilinx XC95144XL gate array (U10) to generate CNVST, manage BUSY synchronization, and buffer conversion data for both parallel and serial read modes.

Analog front-end circuitry includes dual op-amps (U6, U7) configured as unity-gain buffers by default, supporting ±12 V supplies selectable via solder jumpers SJ1/SJ2, and configurable input ranges (0–2.5 V, ±5 V) through S1–S7 pads and JP1–JP8 jumpers. Reference options include AD780/ADR431/ADR435 with selectable buffering (JP20) and supply (JP4, JP7).

Key Specifications

Availability

EVAL-AD7622EDZ is available at Aetrix Electronics and suitable for precision data acquisition, industrial process monitoring, and test equipment development requiring stable component supply, full-spectrum AC/DC ADC validation, and flexible interface prototyping.

Supply support for EVAL-AD7622EDZ 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, with design and manufacturing expertise spanning precision converters, amplifiers, and RF solutions.

The EVAL-AD7622EDZ belongs to Analog Devices' PulSAR® evaluation platform family, engineered specifically to accelerate development for high-speed, high-resolution SAR ADCs used in instrumentation, medical imaging, and automated test equipment where low power, low noise, and flexible digital interfacing are essential.

FAQ

What ADCs does the EVAL-AD7622EDZ support besides the AD7622?

The EVAL-AD7622EDZ is part of the EVAL-AD76XXEDZ family and supports multiple 48-lead PulSAR ADCs including the AD7621 (3 MSPS), AD7623 (1.33 MSPS), AD7641/AD7643 (18-bit), AD7663/AD7665/AD7671 (bipolar), and others listed in Table 1. All share compatible pinouts, interface logic, and board-level configuration options - but each requires correct jumper (JP1–JP22) and switch (S16/S35) settings per its specific resolution, input range, and power requirements. The EVAL-AD7622EDZ itself is validated for use with the AD7622.

Can the EVAL-AD7622EDZ operate without the EVAL-CED1Z capture board?

Yes, the EVAL-AD7622EDZ supports fully stand-alone operation. When the CONTROL input to the gate array (U10) is held LOW (default), it autonomously generates CNVST, manages BUSY signaling, and buffers conversion data onto BD[0:15] at P2. No host PC or CED board is required for basic DC testing (e.g., histogram using on-board VREF/2) or AC evaluation with external signal sources applied to SMB connectors J1/J2. Configuration is managed via DIP switches S16 and S35.

How is analog input range configured for the AD7622 on the EVAL-AD7622EDZ?

The AD7622 operates with a differential unipolar 0 V to 2.5 V input range by default. On the EVAL-AD7622EDZ, this is achieved using the factory-set unity-gain buffer configuration (JP1/JP2 = BUFF), ±12 V analog supplies (JP3 = –12V, JP8 = +12V), and on-board reference (JP4 = REF). To change input scaling or enable bipolar operation, physical modifications to solder pads S1–S7 are required - though the AD7622 itself does not support bipolar input, so such changes would only apply when evaluating other compatible ADCs like the AD7665.

What software tools are provided for the EVAL-AD7622EDZ?

Analog Devices provides the "PulSAR ADC Evaluation Software" (Eval PulSAR CED.exe), which runs on Windows XP and interfaces exclusively with the EVAL-CED1Z USB capture board. It supports histogram analysis (DC code distribution, transition noise), FFT-based AC measurements (SNR, SINAD, THD, SFDR), time-domain waveform display, and configurable sampling parameters (rate, samples, input range). Stand-alone use does not require this software - raw data can be captured via logic analyzer or microcontroller from P2 or test points.

Does the EVAL-AD7622EDZ provide power sequencing control for the AD7622?

Yes - the EVAL-AD7622EDZ implements controlled power sequencing via configurable jumpers. For the AD7622, OVDD (digital output supply) must be ramped after AVDD (analog supply) to avoid latch-up. This is supported by jumper JP6 (OVDD selection) and JP9 (DVDD selection), with recommended settings of JP6 = 3.3V and JP9 = VDIG (i.e., +5V from SJ2). The board's analog/digital supply separation and dedicated ground planes further ensure proper sequencing integrity during power-up and transient events.