Analog Devices Inc. EVAL-AD7657-1EDZ

Overview

EVAL-AD7657-1EDZ from Analog Devices is an evaluation board for the AD7657-1 14-bit, 6-channel, simultaneous-sampling SAR ADC. It supports true bipolar ±10 V/±5 V analog inputs, delivers 250 kSPS throughput, and features on-chip 2.5 V reference, high-speed parallel/serial interfaces, and iCMOS process technology - enabling use in power line monitoring and multiaxis control systems.

For engineers reviewing the EVAL-AD7657-1EDZ datasheet, EVAL-AD7657-1EDZ pinout, EVAL-AD7657-1EDZ application, or EVAL-AD7657-1EDZ equivalent, this board provides full hardware validation of the AD7657-1's simultaneous sampling accuracy, channel-to-channel isolation (−100 dB), SNR (83.5 dB), and flexible interface modes (SPI/QSPI/MICROWIRE-compatible serial, parallel, daisy-chain).

Technical Context

The EVAL-AD7657-1EDZ implements the complete signal chain for the AD7657-1 IC: six independent track-and-hold amplifiers with 4.5 MHz full-power bandwidth, internal 2.5 V reference with 6 ppm/°C drift, and configurable input ranges (±4 × VREF or ±2 × VREF) via RANGE pin or software control. It supports three independent CONVST signals for staggered or fully simultaneous sampling across three ADC pairs (V1/V2, V3/V4, V5/V6).

Interface flexibility includes high-speed parallel mode (16-bit data bus), serial mode with programmable SCLK up to 18 MHz, and daisy-chain capability for multi-board synchronization. Power management features include STBY pin-controlled full power-down (315 µW) and partial power-down (40 mW), all validated per AD7657-1's 64-lead LQFP pinout and decoupling requirements.

Key Specifications

Availability

EVAL-AD7657-1EDZ is available at Aetrix Electronics and suitable for power line monitoring, instrumentation and control systems, and multiaxis positioning systems requiring stable component supply and rapid prototyping validation.

Supply support for EVAL-AD7657-1EDZ 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.

The EVAL-AD7657-1EDZ belongs to Analog Devices' precision data acquisition evaluation platform family, designed specifically to accelerate development of high-channel-count, simultaneous-sampling measurement systems in industrial automation and energy infrastructure.

FAQ

What is the primary function of the EVAL-AD7657-1EDZ?

The EVAL-AD7657-1EDZ is a dedicated evaluation board for the AD7657-1 14-bit, 6-channel simultaneous-sampling ADC. It provides complete hardware implementation - including power regulation, reference buffering, analog input conditioning, and interface circuitry - to validate timing, noise performance, and functional behavior of the AD7657-1 in real system conditions before design-in.

Does the EVAL-AD7657-1EDZ support both parallel and serial interfaces for the AD7657-1?

Yes, the EVAL-AD7657-1EDZ fully supports all interface modes of the AD7657-1: high-speed parallel (16-bit data bus with CS/RD/WR control), serial (SPI/QSPI/MICROWIRE-compatible with SCLK up to 18 MHz), and daisy-chain configuration. Jumpers and onboard headers allow direct connection to host processors without modification.

Can the EVAL-AD7657-1EDZ be used to evaluate bipolar input performance of the AD7657-1?

Yes. The EVAL-AD7657-1EDZ routes all six analog inputs (V1–V6) through precision bipolar signal conditioning circuitry and supports both ±10 V and ±5 V ranges via the RANGE pin or software-configurable RNGx bits - enabling full characterization of the AD7657-1's true bipolar operation, including zero-scale error matching (±0.0427% FSR) and full-scale linearity.

What power supply configurations does the EVAL-AD7657-1EDZ require to operate the AD7657-1 correctly?

The EVAL-AD7657-1EDZ requires separate analog (AVCC = 4.75–5.25 V), digital (DVCC = 4.75–5.25 V), logic (VDRIVE = 2.7–5.25 V), and dual-supply analog rails (VDD = +5 to +16.5 V, VSS = −5 to −16.5 V) to match AD7657-1 specifications. Onboard regulators and filtering ensure compliance with iCMOS voltage domain separation and decoupling requirements.

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

Yes - the EVAL-AD7657-1EDZ is pin- and software-compatible with the AD7656-1 (16-bit) and AD7658-1 (12-bit) due to identical 64-lead LQFP packaging, shared CONVST/CS/RD/WR pin assignments, and common interface logic. Firmware and PCB layout developed for EVAL-AD7657-1EDZ can be reused across the family with only resolution-specific calibration adjustments.