Analog Devices Inc. EVAL-AD7658-1SDZ

Overview

EVAL-AD7658-1SDZ from Analog Devices is an evaluation board for the AD7658-1 - a 6-channel, simultaneous-sampling, 12-bit SAR ADC with true bipolar ±10 V/±5 V input ranges, 250 kSPS throughput, on-chip 2.5 V reference, and parallel/serial/daisy-chain interface modes. It supports power line monitoring, multiaxis positioning, and industrial instrumentation prototyping.

For engineers reviewing the EVAL-AD7658-1SDZ datasheet, EVAL-AD7658-1SDZ pinout, EVAL-AD7658-1SDZ application, or EVAL-AD7658-1SDZ equivalent, this board enables rapid validation of the AD7658-1's simultaneous sampling accuracy, channel-to-channel isolation (−100 dB), SNR (73.5 dB at 10 kHz), and low-power operation (140 mW at full rate) in real-world signal acquisition systems.

Technical Context

The EVAL-AD7658-1SDZ implements the full AD7658-1 signal chain: six independent iCMOS-based SAR ADCs with track-and-hold amplifiers supporting up to 4.5 MHz input bandwidth, hardware/software-selectable ±4×VREF (±10 V) or ±2×VREF (±5 V) ranges, and three dedicated CONVST inputs for synchronized sampling across three ADC pairs (V1/V2, V3/V4, V5/V6).

It provides configurable digital interface options - high-speed parallel (16-bit data bus), SPI/QSPI/MICROWIRE-compatible serial, and daisy-chain mode - all supported by on-board level-shifting, decoupling, reference buffering (REFCAPA/B/C), and STBY-controlled 315 µW standby power state.

Key Specifications

Availability

EVAL-AD7658-1SDZ is available at Aetrix Electronics and suitable for power line monitoring, multiaxis positioning systems, and industrial instrumentation requiring stable component supply and fast evaluation turnaround.

Supply support for EVAL-AD7658-1SDZ 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-AD7658-1SDZ belongs to Analog Devices' precision data acquisition evaluation platform family, designed to accelerate development of high-channel-count, simultaneous-sampling measurement systems for industrial and energy infrastructure applications.

FAQ

What is the primary function of the EVAL-AD7658-1SDZ evaluation board?

The EVAL-AD7658-1SDZ is a fully populated, ready-to-use evaluation platform for the AD7658-1 6-channel, 12-bit, 250 kSPS simultaneous-sampling ADC. It enables engineers to validate timing, noise performance, interface compatibility, and system-level signal integrity - including true bipolar input handling, channel isolation, and daisy-chain configuration - without custom PCB design. The board includes all necessary decoupling, reference buffering, and level-shifting circuitry required to operate the AD7658-1 per its datasheet specifications.

Does the EVAL-AD7658-1SDZ support both parallel and serial interfaces for the AD7658-1?

Yes, the EVAL-AD7658-1SDZ supports both high-speed parallel (16-bit data bus with RD/WR/CS/BUSY control) and serial (SPI/QSPI/MICROWIRE-compatible) interfaces for the AD7658-1. It also enables daisy-chain mode for multi-ADC synchronization. All interface modes are accessible via onboard headers and jumpers, and the board includes proper termination, clock conditioning, and logic-level translation to ensure signal integrity at up to 18 MHz SCLK and full 250 kSPS throughput.

Can the EVAL-AD7658-1SDZ be used to evaluate the AD7656-1 or AD7657-1 as well?

No - the EVAL-AD7658-1SDZ is specifically optimized for the AD7658-1 (12-bit resolution). While the AD7656-1 (16-bit) and AD7657-1 (14-bit) share pin and software compatibility with the AD7658-1, their DC accuracy, dynamic performance (e.g., 88 dB SNR for AD7656-1 vs. 73.5 dB for AD7658-1), and internal calibration structures differ significantly. Analog Devices provides separate evaluation boards - EVAL-AD7656-1SDZ and EVAL-AD7657-1SDZ - for accurate characterization of those variants.

What power supply requirements must be met to operate the EVAL-AD7658-1SDZ with full functionality?

To operate the EVAL-AD7658-1SDZ with full 250 kSPS throughput and ±10 V input range, three isolated supplies are required: AVCC/DVCC/VDRIVE = +4.75 V to +5.25 V (digital/analog core), VDD = +10 V to +16.5 V (positive analog rail), and VSS = −10 V to −16.5 V (negative analog rail). The board includes screw terminals and filtering for all rails, and supports on-board 2.5 V reference operation without external REF input. Standby mode reduces total supply current to ≤60 µA.

How does the EVAL-AD7658-1SDZ handle analog input protection and signal conditioning?

The EVAL-AD7658-1SDZ routes all six analog inputs (V1–V6) through 240 Ω series resistors and Schottky clamping diodes referenced to VDD/VSS, per Analog Devices' absolute maximum rating guidance for overvoltage protection. Inputs are routed directly to the AD7658-1's iCMOS input structure, preserving high impedance (>1 GΩ DC leakage), low capacitance (10–14 pF), and true bipolar capability. No external op-amp buffering or gain stages are included - the board is designed for direct connection to calibrated signal sources or sensor front-ends.