Analog Devices Inc. EVAL-AD7665EDZ

Overview

EVAL-AD7665EDZ from Analog Devices is an evaluation board designed specifically for the AD7665 - a 16-bit, 570 kSPS single-ended bipolar SAR ADC with ±5 V input range. It provides buffered parallel (16-bit) and serial interfaces, on-board precision reference (ADR431/AD780), clock oscillator, analog signal conditioning circuitry, and full PC software support for histogram and FFT analysis.

For engineers reviewing the EVAL-AD7665EDZ datasheet, EVAL-AD7665EDZ pinout, EVAL-AD7665EDZ application, or EVAL-AD7665EDZ equivalent, this board enables rapid validation of AD7665 performance in data acquisition, industrial instrumentation, and precision test equipment - with configurable analog input scaling, stand-alone or CED1Z-coupled operation, and jumper-selectable power/reference modes.

Technical Context

The EVAL-AD7665EDZ supports the AD7665's native ±5 V bipolar input range via factory-configured solder pads (S1–S7) and op-amp-based signal conditioning (U6/U7). It implements conversion control using either internal gate-array-generated CNVST (jumper JP22 = INT) or external low-jitter SMB-triggered start signals.

Power delivery is segregated into analog (AVDD, ±12 V via SJ1) and digital (DVDD/OVDD, +5 V or +3.3 V via SJ2) domains, with dedicated ground planes connected only under the ADC to preserve SNR. Interface flexibility includes parallel BD[0:15] output (40-pin IDC P2), 96-pin DIN connector for EVAL-CED1Z, and buffered serial signals (SDOUT/SCLK/SYNC) accessible at test points TP17–TP19.

Key Specifications

Availability

EVAL-AD7665EDZ is available at Aetrix Electronics and suitable for precision data acquisition, industrial process monitoring, and automated test equipment requiring stable component supply, full evaluation toolchain access, and long-term hardware validation support.

Supply support for EVAL-AD7665EDZ 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-AD7665EDZ belongs to Analog Devices' PulSAR® evaluation platform family, engineered to accelerate development for high-resolution SAR ADCs used in precision measurement, instrumentation, and industrial control systems.

FAQ

What is the primary function of the EVAL-AD7665EDZ?

The EVAL-AD7665EDZ is an evaluation board purpose-built for the AD7665 16-bit, 570 kSPS bipolar SAR ADC. It provides complete hardware infrastructure - including reference, clock, signal conditioning, parallel/serial I/O, and PC software - to characterize dynamic performance (SNR, SINAD, THD), DC accuracy (transition noise), and interface behavior without custom design effort. The EVAL-AD7665EDZ enables immediate bench-level validation of the AD7665 in real system contexts.

Does the EVAL-AD7665EDZ support both stand-alone and CED1Z-coupled operation?

Yes, the EVAL-AD7665EDZ operates in two distinct modes: as a stand-alone system (gate array U10 drives CNVST, RD, CS; no PC required) or integrated with the EVAL-CED1Z capture board via its 96-pin DIN connector. In stand-alone mode, configuration switches S16/S35 define conversion timing, data format, and read protocol; with CED1Z, full Windows-based software control and data streaming are enabled. Both modes retain identical analog signal path integrity and reference stability.

How is the ±5 V input range implemented on the EVAL-AD7665EDZ for the AD7665?

The EVAL-AD7665EDZ is factory configured for ±5 V input range using precision resistor dividers (R6/R7, R29/R60) that bias the AD7665's IN+ and IN− inputs to 0 V mid-scale, with U6/U7 op-amps operating as unity-gain buffers. This configuration matches the AD7665's hardware-strapped bipolar input architecture. To change range (e.g., ±10 V), users must modify solder jumpers S1–S7 per schematics - no component replacement is needed, preserving signal fidelity and noise performance.

Which reference options are available on the EVAL-AD7665EDZ, and how are they selected?

The EVAL-AD7665EDZ supports three reference configurations: on-board ADR431 (2.5 V), AD780 (2.5 V), or AVDD-derived reference. Selection is controlled by jumper JP4 (REF = internal reference, VDD = AVDD) and JP20 (BUF = buffer enabled, NO BUFF = direct connection). Reference buffering improves PSRR and reduces noise coupling; JP7 (VREF+) and JP4 jointly determine reference headroom and stability across temperature and load conditions.

Can the EVAL-AD7665EDZ be used with other PulSAR ADCs besides the AD7665?

Yes - the EVAL-AD7665EDZ is part of the EVAL-AD76XXEDZ family supporting multiple 48-lead PulSAR ADCs, including AD762X, AD763X, AD764X, AD765X, AD766X, AD767X, and AD795X devices. While mechanical footprint and core interface logic are shared, each variant requires specific jumper (JP1–JP22) and switch (S16/S35) settings to match the target ADC's resolution, input type (bipolar/unipolar), reference scheme, and timing requirements - confirmed in Table 1 and the device-specific datasheet.