Analog Devices Inc. AD9251-65EBZ

Overview

AD9251-65EBZ from Analog Devices is a full-featured evaluation board designed specifically for the AD9251 12-bit, 65 MSPS analog-to-digital converter (ADC), supporting SPI-based configuration, transformer-coupled or balun-driven differential analog inputs, and flexible clocking via on-board 65 MHz Valpey Fisher oscillator or external source. It enables high-fidelity ac performance characterization up to ~150 MHz input frequency with 2 V p-p full-scale range.

For engineers reviewing the AD9251-65EBZ datasheet, AD9251-65EBZ pinout, AD9251-65EBZ application, or AD9251-65EBZ equivalent, this board provides validated signal chain implementation-including LDO/switching power supply options, VisualAnalog® and SPI controller software integration, HSC-ADC-EVALCZ FPGA capture compatibility, and configurable input drive paths using AD8375 DVGA or ADL5562 amplifier-critical for ADC selection, layout validation, and system-level timing analysis.

Technical Context

The AD9251-65EBZ implements a dual-channel, 12-bit, 65 MSPS ADC evaluation platform with CMOS digital outputs routed to an FPGA-based data capture interface. Its analog front-end supports 50 Ω terminated, double-balun-coupled inputs optimized for up to ~150 MHz bandwidth and 10 dBm nominal drive level.

Power delivery includes default low-dropout linear regulators (LDOs) for AVDD/DRVDD/DVDD rails, with optional ADP2114 switching regulator substitution for efficiency testing. Clocking supports three modes: on-board 65 MHz VFAC3-BHL-65MHz oscillator (enabled via J605), external single-ended sine wave via SMA J602, or differential LVPECL from AD9517 (U701) configured via SPI.

Key Specifications

Availability

AD9251-65EBZ is available at Aetrix Electronics and suitable for high-speed data acquisition, communications receiver prototyping, and instrumentation design requiring stable component supply, traceable sourcing, and long-term evaluation platform continuity.

Supply support for AD9251-65EBZ 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision and high-speed applications.

The AD9251-65EBZ belongs to Analog Devices' high-speed ADC evaluation platform family, engineered to accelerate development of RF sampling, communications infrastructure, and test equipment by providing production-grade signal integrity, validated power architecture, and software-integrated measurement workflows.

FAQ

What is the primary function of the AD9251-65EBZ?

The AD9251-65EBZ is an evaluation board-not a semiconductor component-that enables functional and performance validation of the AD9251 12-bit, 65 MSPS dual-channel analog-to-digital converter. It provides all necessary support circuitry including clock generation, analog input conditioning, power regulation, SPI configuration interface, and CMOS output buffering compatible with the HSC-ADC-EVALCZ FPGA capture platform. The AD9251-65EBZ itself does not convert signals; it hosts and exercises the AD9251 device under test.

Does the AD9251-65EBZ include the AD9251 IC?

Yes, the AD9251-65EBZ evaluation board is populated with the AD9251-65 (12-bit, 65 MSPS) analog-to-digital converter as the device under test (DUT). The board's hardware, jumpers, and schematics are specifically tailored to the AD9251's pinout, biasing requirements, and interface specifications-including its 1.0 V internal reference, 2 V p-p full-scale input range, and CMOS parallel output structure. The AD9251-65EBZ delivers out-of-box readiness for ac performance testing per the AD9251 datasheet.

What clock sources are supported by the AD9251-65EBZ?

The AD9251-65EBZ supports three clock configurations: (1) on-board 65 MHz Valpey Fisher VFAC3-BHL-65MHz oscillator (enabled via jumper J605), (2) external single-ended sine wave applied to SMA connector J602 (50 Ω terminated, ~2.8 V p-p or 13 dBm), and (3) differential LVPECL clock from the AD9517 (U701), enabled by populating R607/R608 and R731/R732 while removing R609/R610 and R611/R612. All paths feed the AD9251's differential CLK+/CLK− inputs through low-jitter signal conditioning.

Can the AD9251-65EBZ be used with other ADCs besides the AD9251?

No-the AD9251-65EBZ is specifically configured for the AD9251-65 and shares hardware only with other members of the AD9269 family (AD9231, AD9204, AD9269, AD6659) as defined in Table 1 of UG-003. While the board's physical layout accommodates multiple families, the AD9251-65EBZ variant uses family-specific default settings: 1.0 V internal reference, ~150 MHz input network (Figure 5), and 65 MHz oscillator. Using it with non-AD9269-family ADCs requires redesign of biasing, termination, and clocking-making the AD9251-65EBZ unsuitable for AD9268 or AD9650 devices without hardware modification.

What software tools are required to operate the AD9251-65EBZ?

Two primary software tools are required: VisualAnalog® for FFT-based ac performance analysis (SNR, SFDR, THD) and real-time waveform visualization, and the SPI Controller software for register-level configuration of the AD9251-65 (e.g., clock divider, output format, power-down mode). Both tools are provided free by Analog Devices and integrate directly with the AD9251-65EBZ's USB-connected HSC-ADC-EVALCZ data capture board. Configuration files must match the AD9251 part number to ensure correct register mapping and feature enablement.