Analog Devices Inc. AD6655-125EBZ

Overview

AD6655-125EBZ from Analog Devices is an evaluation board for the AD6655-125, a dual-channel 14-bit 125 MSPS IF diversity receiver IC with integrated digital downconverter (DDC), 32-bit NCO, half-band decimation filter, and FIR filter. It supports IF sampling up to 450 MHz, delivers 74.6 dB SNR at 70 MHz input, and enables real/complex output modes via CMOS or LVDS interfaces. Designed for multimode wireless base stations and software-defined radios.

For engineers reviewing the AD6655-125EBZ datasheet, AD6655-125EBZ pinout, AD6655-125EBZ application, or AD6655-125EBZ equivalent, this page provides verified technical context, key specifications, supply support, and manufacturer-specific design guidance - all grounded in Analog Devices' official AD6655 Rev. B documentation and evaluation board reference design.

Technical Context

The AD6655-125EBZ implements a complete IF receiver signal chain: dual 14-bit pipelined ADCs feed directly into independent DDC channels, each comprising a 32-bit complex NCO, programmable half-band decimator, and fixed-coefficient FIR filter. The board supports both real and complex output formats, with flexible clocking (integer 1-to-8 divider) and analog input ranges (1–2 V p-p).

It integrates fast overrange detection (4-bit threshold output), composite signal monitoring (peak/RMS/threshold modes), and multi-chip synchronization via SYNC input. Power management includes standby and full power-down modes, with total active power of 1215 mW (1.8 V LVDS output, sine-wave input).

Key Specifications

Availability

AD6655-125EBZ is available at Aetrix Electronics and suitable for wireless infrastructure development, SDR prototyping, and multimode receiver validation requiring stable component supply, traceable sourcing, and long-term lifecycle coordination.

Supply support for AD6655-125EBZ 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 leader in high-performance analog, mixed-signal, and DSP technologies, headquartered in Norwood, MA, with deep expertise in RF, precision conversion, and signal processing ICs.

The AD6655 product line targets communications infrastructure applications - specifically IF sampling receivers for diversity radio systems, multimode base stations (TD-SCDMA, WCDMA, LTE), and software-defined radios - where integration, dynamic range, and low-latency DDC are critical.

FAQ

What is the AD6655-125EBZ used for?

The AD6655-125EBZ is an evaluation board designed to validate and prototype the AD6655-125 dual-channel IF receiver IC. It enables rapid development of diversity reception systems, software-defined radios, and multimode wireless base station receivers by providing fully tested analog front-end circuitry, clock conditioning, power regulation, and FPGA-compatible digital outputs. Engineers use the AD6655-125EBZ to characterize SNR, SFDR, DDC performance, and signal monitor functionality before integrating the AD6655-125 into custom PCBs.

Does the AD6655-125EBZ support both CMOS and LVDS output modes?

Yes, the AD6655-125EBZ supports both CMOS and LVDS output configurations as defined by the underlying AD6655-125 IC. Jumper-selectable settings allow users to configure DRVDD for 1.8 V LVDS or 1.8–3.3 V CMOS operation, and the board routes D0A–D13A/D0B–D13B outputs accordingly. Real or complex data formats (interleaved or independent) are controlled via SPI register writes to the AD6655-125 on the AD6655-125EBZ board.

What sample rates does the AD6655-125EBZ support?

The AD6655-125EBZ evaluates the AD6655-125 IC, which operates at a fixed maximum sample rate of 125 MSPS per channel. This rate is enforced by the internal ADC architecture and validated across the full industrial temperature range. The board accepts external clock inputs (differential CLK+/CLK−) and includes a duty cycle stabilizer to maintain ADC performance even with non-50% duty-cycle clocks - a key capability confirmed in the AD6655-125EBZ schematic and layout documentation.

Can the AD6655-125EBZ be synchronized with other AD6655-based boards?

Yes, the AD6655-125EBZ implements the multi-chip SYNC input feature of the AD6655-125 IC. When driven synchronously with a common clock and aligned SYNC pulse, multiple AD6655-125EBZ boards can achieve deterministic phase alignment across ADC sampling instants and DDC NCO phases. This capability is explicitly documented in the AD6655 Rev. B datasheet Section "Channel/Chip Synchronization" and verified in the AD6655-125EBZ user guide's timing diagrams.

What power supplies are required for the AD6655-125EBZ?

The AD6655-125EBZ requires three regulated DC supplies: 1.8 V for AVDD and DVDD (analog and digital core), and a selectable 1.8 V (LVDS) or 1.8–3.3 V (CMOS) for DRVDD (output driver). These are delivered via the board's screw-terminal header or optional DC barrel jack. Power sequencing is managed internally; no strict ramp-order requirement exists between rails, as confirmed by the AD6655-125EBZ power supply section in the evaluation board user guide.