Analog Devices Inc. EVAL-AD7656-1EDZ

Overview

EVAL-AD7656-1EDZ from Analog Devices is an evaluation board for the AD7656-1 6-channel, 250 kSPS, 16-bit simultaneous-sampling SAR ADC with true bipolar ±10 V/±5 V input ranges, on-chip 2.5 V reference, and parallel/serial/daisy-chain interface - designed for power line monitoring, multiaxis control, and industrial instrumentation validation.

For engineers reviewing the EVAL-AD7656-1EDZ datasheet, EVAL-AD7656-1EDZ pinout, EVAL-AD7656-1EDZ application, or EVAL-AD7656-1EDZ equivalent, this board enables rapid functional verification of the AD7656-1's simultaneous sampling accuracy, channel isolation (>−100 dB), SNR (88 dB at 10 kHz), and interface timing compliance in real-world analog acquisition systems.

Technical Context

The EVAL-AD7656-1EDZ implements a complete signal chain around the AD7656-1 IC, including precision decoupling networks for AVCC/DVCC/VDRIVE, dedicated AGND/DGND separation, on-board REFCAPA/B/C capacitor pads (1 µF each), and configurable RANGE/H/S SEL jumpers to validate ±4×VREF (±10 V) and ±2×VREF (±5 V) operation. It supports all three CONVST inputs (A/B/C) for independent pair-triggered sampling.

It provides direct access to all 64 LQFP pins via test points and headers, enabling full characterization of parallel (16-bit data bus + RD/WR/CS/BUSY) and serial (SCLK/DOUT A–C/DCEN/DCIN A–C) modes, including daisy-chain configuration across multiple AD7656-1 devices using the SER/PAR SEL and DCEN controls.

Key Specifications

Availability

EVAL-AD7656-1EDZ is available at Aetrix Electronics and suitable for power line monitoring, industrial instrumentation, and multiaxis positioning system development requiring stable component supply, traceable evaluation hardware, and full interface validation capability.

Supply support for EVAL-AD7656-1EDZ 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, serving industrial, communications, automotive, and healthcare markets.

The EVAL-AD7656-1EDZ belongs to Analog Devices' precision data acquisition evaluation platform family, engineered specifically to accelerate design-in and performance validation of high-channel-count, simultaneous-sampling ADCs in noise-sensitive, high-voltage industrial applications.

FAQ

What is the primary function of the EVAL-AD7656-1EDZ evaluation board?

The EVAL-AD7656-1EDZ is a fully populated, ready-to-use evaluation platform for the AD7656-1 6-channel, 250 kSPS, 16-bit simultaneous-sampling ADC. It enables engineers to verify timing, noise performance, channel isolation, and interface compatibility - including parallel, serial, and daisy-chain configurations - without custom PCB design. The board directly supports the AD7656-1's ±10 V/±5 V bipolar input ranges and on-chip 2.5 V reference.

Does the EVAL-AD7656-1EDZ support daisy-chain operation for multiple AD7656-1 devices?

Yes, the EVAL-AD7656-1EDZ supports daisy-chain mode via its exposed DCEN, SER/PAR SEL, and DOUT A–C/DCIN A–C signals. When configured with SER/PAR SEL = 1 and DCEN = 1, the board allows cascading of multiple AD7656-1 devices on a single serial interface - validated per AD7656-1 datasheet Figure 27 and Timing Table 4. All required control lines and termination options are implemented on the board.

Can the EVAL-AD7656-1EDZ be used to evaluate both ±10 V and ±5 V input ranges of the AD7656-1?

Yes, the EVAL-AD7656-1EDZ supports both input ranges through hardware (RANGE pin jumper) and software (RNGx bits) configuration. Its analog input section is designed for true bipolar operation up to ±10 V, with proper VDD/VSS supply routing (±5 V to ±16.5 V) and AGND-referenced signal paths - matching the AD7656-1's specified ±4×VREF and ±2×VREF operating modes.

What power supplies are required to operate the EVAL-AD7656-1EDZ with the AD7656-1?

The EVAL-AD7656-1EDZ requires four independent supplies: AVCC and DVCC (4.75–5.25 V), VDRIVE (2.7–5.25 V), and dual analog rails (VDD = +5 to +16.5 V, VSS = −5 to −16.5 V). These match the AD7656-1's absolute ratings and operational specs - ensuring correct biasing of the iCMOS core, reference buffers, and logic interfaces during full-speed 250 kSPS operation.

Is the EVAL-AD7656-1EDZ compatible with other members of the AD7656-1/AD7657-1/AD7658-1 family?

Yes, the EVAL-AD7656-1EDZ is pin- and software-compatible with AD7657-1 (14-bit) and AD7658-1 (12-bit) variants per Analog Devices' documentation. All share identical 64-lead LQFP packaging, CONVST A/B/C timing, reference architecture, and interface protocols - allowing the same board to validate resolution trade-offs, SNR differences (88 dB vs. 83.5 dB vs. 73.5 dB), and DC accuracy across the family.