Analog Devices Inc. EVAL-AD7265EDZ

Overview

EVAL-AD7265EDZ from Analog Devices is a dedicated evaluation board for the AD7265 and AD7266 dual 12-bit, 2 MSPS successive approximation ADCs. It supports both single-ended and differential analog input configurations, includes on-board AD780 voltage reference (2.5 V/3.0 V selectable), nine AD8022 dual op amps for signal conditioning, and interfaces via a 96-way edge connector compatible with EVAL-CED1Z.

For engineers reviewing the EVAL-AD7265EDZ datasheet, EVAL-AD7265EDZ pinout, EVAL-AD7265EDZ application, or EVAL-AD7265EDZ equivalent, this board enables rapid functional validation of high-speed data acquisition systems requiring flexible input buffering, reference selection, and channel configuration for industrial instrumentation and test equipment.

Technical Context

The EVAL-AD7265EDZ implements full hardware support for the AD7265/AD7266's dual-channel, simultaneous sampling architecture - including independent analog front-end routing via 49 configurable link options (LK1–LK57), on-board S/E-to-differential conversion using AD8138 and AD8022 op amps, and selectable internal/external reference modes via REF SELECT and RANGE pins.

It provides dual power domains (AVDD/DVDD at +5 V, ±12 V for op amp rails), decoupled with 10 µF tantalum and 0.1 µF ceramic capacitors, and separates AGND/DGND planes connected at a single point near the ADC. The board supports standalone operation or integration with EVAL-CED1Z for PC-based control and data capture.

Key Specifications

Availability

EVAL-AD7265EDZ is available at Aetrix Electronics and suitable for high-speed data acquisition prototyping, ADC performance characterization, and mixed-signal system validation requiring stable component supply and documented reference design fidelity.

Supply support for EVAL-AD7265EDZ 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 deep expertise in precision data conversion and signal chain solutions.

The EVAL-AD7265EDZ belongs to Analog Devices' evaluation board product line, designed specifically to accelerate development for high-speed, low-power SAR ADC applications in instrumentation, medical imaging, and automated test equipment.

FAQ

What is the primary function of the EVAL-AD7265EDZ?

The EVAL-AD7265EDZ is a dedicated evaluation platform for the AD7265 and AD7266 dual 12-bit, 2 MSPS SAR ADCs. It provides complete hardware support-including analog buffering, reference selection, S/E-to-differential conversion, and configurable link-based signal routing-to enable functional verification, performance testing, and system-level integration of these ADCs without custom PCB design. EVAL-AD7265EDZ is not intended for production use.

Does the EVAL-AD7265EDZ support both single-ended and differential input modes?

Yes, the EVAL-AD7265EDZ fully supports both modes. Single-ended operation uses on-board unity-gain buffers (U3/U4) and optional bias-up circuitry (LK50/LK52), while differential mode leverages AD8138 and AD8022-based S/E-to-differential converters with configurable common-mode voltage (LK33/LK38/LK43/LK48) and termination (LK31/LK36/LK41/LK46). Link positions (e.g., LK21, LK19) determine active mode per ADC core. EVAL-AD7265EDZ allows independent configuration for each channel pair.

Which reference voltage options are available on the EVAL-AD7265EDZ?

The EVAL-AD7265EDZ supports internal 2.5 V reference (selected via LK19 Position B) or external reference from the on-board AD780, which is programmable to 2.5 V (LK16 removed) or 3.0 V (LK16 inserted). External references can also be applied via J24 (DCAPA) and J25 (DCAPB), with LK13/LK14 determining source routing. All configurations are validated for AD7265/AD7266 compliance per datasheet specifications. EVAL-AD7265EDZ ensures correct reference coupling and decoupling per Analog Devices' layout guidelines.

Can the EVAL-AD7265EDZ operate without the EVAL-CED1Z controller board?

Yes, the EVAL-AD7265EDZ supports standalone operation. External +5 V (AVDD/DVDD), ±12 V (op amp rails), and 3.3 V (VDRIVE) supplies can be applied via J2, J3, and J30 (configured via LK15, LK17, LK56, LK57). Digital control signals (CS, SCLK, A0–A2) may be driven externally through J6–J10. However, PC-based data capture and GUI control require EVAL-CED1Z or equivalent SPI host interface. EVAL-AD7265EDZ retains full analog signal path functionality in standalone mode.

How many analog input channels does the EVAL-AD7265EDZ support?

The EVAL-AD7265EDZ maps to the AD7265/AD7266's native 12-channel structure: six VA inputs (VA1–VA6) and six VB inputs (VB1–VB6), supporting simultaneous sampling across two groups. Each channel's signal source is selected independently via dedicated links (LK1–LK12), enabling flexible assignment of buffered, differential-converter, or grounded inputs. All 12 channels are physically accessible via SMB sockets (J13–J27) and configurable per AD7265/AD7266 channel selection logic. EVAL-AD7265EDZ maintains full pin-for-pin correspondence with the target ADCs' analog interface.