Analog Devices Inc. AD9655-125EBZ

Overview

AD9655-125EBZ from Analog Devices is a full-featured evaluation board designed to characterize the AD9655 16-bit, dual-channel, 125 MSPS analog-to-digital converter in standalone and SPI-controlled modes. It supports transformer-coupled or amplifier-driven analog inputs up to ~200 MHz, features on-board LDO regulation from a single 6 V/2 A supply, and provides LVDS serial output routing to the HSC-ADC-EVALCZ FPGA capture platform.

For engineers reviewing the AD9655-125EBZ datasheet, AD9655-125EBZ pinout, AD9655-125EBZ application, or AD9655-125EBZ equivalent, this board enables AC performance validation-including SNR, SFDR, and ENOB-under real-world clock jitter (<1 ps_rms), filtered analog input, and configurable SPI register settings per the AD9655 data sheet.

Technical Context

The AD9655-125EBZ implements a complete signal chain for the AD9655 ADC, including dual-channel 50 Ω balun-coupled analog input paths, an optional ADA4930-1 (Ch A) or ADL5565 (Ch B) amplifier path, and a transformer-based clock interface compatible with on-board 125 MHz crystal oscillator (Y602) or external SMA clock input (J602). The board routes all ADC LVDS outputs to P802 for connection to the HSC-ADC-EVALCZ.

Power delivery uses a single 6 V input conditioned by on-board ferrite beads and LDOs to generate 1.8 V_AVDD, 1.8 V_DRVDD, 3.3 V_AVDD (for AD9517 option), and AMP_VDD. Jumper-configurable modes support both SPI-controlled operation (via J301) and pin-mode control of power-down (SDIO/PDWN) and output format (SCLK/DFS).

Key Specifications

Availability

AD9655-125EBZ is available at Aetrix Electronics and suitable for high-speed data acquisition, software-defined radio prototyping, and instrumentation design requiring stable component supply, traceable sourcing, and long-term evaluation platform continuity.

Supply support for AD9655-125EBZ 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 measurement, communications, and industrial applications.

The AD9655-125EBZ belongs to Analog Devices' high-speed ADC evaluation board family, engineered to accelerate characterization and integration of their 12–16-bit, 65–250 MSPS pipeline ADCs into RF, test & measurement, and medical imaging systems.

FAQ

What is the primary function of the AD9655-125EBZ evaluation board?

The AD9655-125EBZ evaluation board is a dedicated hardware platform for evaluating the AD9655 16-bit, dual-channel, 125 MSPS analog-to-digital converter. It provides all necessary support circuitry-including analog input conditioning, clock distribution, power regulation, and LVDS output interfacing-to validate AC performance metrics such as SNR, SFDR, and ENOB under controlled lab conditions using VisualAnalog and SPIController software tools.

Does the AD9655-125EBZ support both transformer-coupled and amplifier-based analog input paths?

Yes, the AD9655-125EBZ supports both configurations. Channel A includes an optional ADA4930-1 amplifier enabled via jumper P401; Channel B includes an optional ADL5565 amplifier enabled via jumper P501. By default, both amplifiers are disabled, and the board uses double-balun coupling for 50 Ω single-ended analog inputs up to ~200 MHz-matching the AD9655's specified input bandwidth.

Can the AD9655-125EBZ operate without the HSC-ADC-EVALCZ FPGA capture board?

No-the AD9655-125EBZ does not include onboard data capture or storage. Its LVDS serial outputs are routed exclusively to connector P802 for direct connection to the HSC-ADC-EVALCZ FPGA-based capture platform. Without that companion board-or a custom FPGA interface capable of receiving 100 Ω differential LVDS at 125 MSPS-no digitized sample data can be acquired or analyzed from the AD9655-125EBZ.

What clock sources are compatible with the AD9655-125EBZ?

The AD9655-125EBZ accepts either the on-board 125 MHz crystal oscillator (Y602) or an external clock via SMA connector J602. When using the external source, jumper P601 must be removed to disable the oscillator. The board's transformer-coupled clock input supports ~2.8 V_p-p or 13 dBm sine wave signals and is compatible with the AD9655's internal 8:1 clock divider for higher-frequency inputs.

How is SPI communication configured on the AD9655-125EBZ?

SPI communication on the AD9655-125EBZ is enabled by configuring jumper J301 to connect Pin 1–2 (SDIO), Pin 4–5 (SCLK), and Pin 8–9 (CSB), linking the AD9655's SPI interface to the HSC-ADC-EVALCZ. The SPIController software then communicates over USB to program AD9655 registers-including clock divide ratio, output mode, and channel gain-allowing full configuration without modifying hardware jumpers during testing.