Analog Devices Inc. AD9691-1250EBZ

Overview

AD9691-1250EBZ from Analog Devices is a high-speed evaluation board for the AD9691 dual 14-bit, 1.25 GSPS analog-to-digital converter. It enables JESD204B Subclass 1 serial interface validation, supports up to 1.5 GHz analog input bandwidth, delivers 63.4 dBFS SNR at 340 MHz, and integrates dual digital downconverters (DDCs) with 12-bit NCOs and cascaded half-band filters - used in wideband communications receivers and DOCSIS 3.x CMTS upstream paths.

For engineers reviewing the AD9691-1250EBZ datasheet, AD9691-1250EBZ pinout, AD9691-1250EBZ application, or AD9691-1250EBZ equivalent, this page provides verified technical context, key specifications, supply availability, manufacturer background, and targeted FAQs - all grounded in Analog Devices' official AD9691 Rev. A datasheet and evaluation board documentation.

Technical Context

The AD9691-1250EBZ implements full hardware reference design for the AD9691 IC, including matched 50 Ω differential analog input paths, LVDS-compatible SYSREF± and SYNCINB± interfaces, configurable CML JESD204B lane outputs (1–8 lanes), and SPI-controlled DDC configuration. It supports multichip synchronization via SYSREF± timing alignment and provides access to fast detect outputs (FD_A/FD_B) for real-time AGC implementation.

Board-level features include on-board LDOs for AVDD1 (1.25 V), AVDD2 (2.5 V), AVDD3 (3.3 V), DVDD (1.25 V), DRVDD (1.25 V), and SPIVDD (1.8 V); thermal management via exposed EPAD grounding; and clock conditioning circuitry compatible with LVDS/LVPECL inputs up to 4 GHz. All power domains are independently monitored and decoupled per AD9691 layout guidelines.

Key Specifications

Availability

AD9691-1250EBZ is available at Aetrix Electronics and suitable for high-speed data acquisition systems, DOCSIS 3.x cable modem termination system (CMTS) development, and wideband RF test instrumentation requiring stable component supply and validated reference design fidelity.

Supply support for AD9691-1250EBZ 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 AD9691-1250EBZ belongs to Analog Devices' high-speed ADC evaluation platform family, designed to accelerate prototyping and system integration of JESD204B-based wideband receivers in communications infrastructure and test equipment.

FAQ

What is the primary function of the AD9691-1250EBZ?

The AD9691-1250EBZ is an evaluation board for the AD9691 dual 14-bit, 1.25 GSPS ADC. It provides a fully validated hardware platform to evaluate JESD204B Subclass 1 interface performance, DDC functionality, analog input linearity up to 1.5 GHz, and multichip synchronization using SYSREF±. The board is not a standalone IC but a reference design enabling rapid system-level validation of the AD9691 IC in real-world signal chains.

Does the AD9691-1250EBZ include on-board clock generation?

No, the AD9691-1250EBZ does not include an integrated clock generator. It accepts external LVDS or LVPECL clock signals via CLK+/CLK− inputs (pins 74/75), supporting clock rates from 300 MHz to 4 GHz. Users must supply a low-jitter clock source meeting AD9691's aperture jitter requirement (<55 fs rms) - typically a high-stability XO or jitter-attenuated clock synthesizer - to achieve specified SNR and SFDR performance.

Can the AD9691-1250EBZ operate with single-ended analog inputs?

No. The AD9691-1250EBZ is designed exclusively for differential analog input operation, matching the AD9691's native input architecture. Its front-end uses transformer-coupled or balun-based differential drive paths optimized for 50 Ω, 100 Ω, 200 Ω, or 400 Ω termination. Single-ended input is not supported by the board layout or signal chain; attempting it would violate common-mode voltage requirements (2.05 V) and degrade linearity, noise, and bandwidth.

What software tools are required to configure the AD9691-1250EBZ?

Configuration requires Analog Devices' ACE (Analysis, Control, Evaluation) software with the AD9691 plugin. ACE communicates with the AD9691-1250EBZ via USB-to-SPI bridge, enabling real-time register access, DDC parameter tuning (NCO frequency, filter taps), JESD204B lane setup, fast detect threshold adjustment, and performance monitoring (SNR, SFDR, FFT). No third-party or custom firmware is needed - ACE provides full GUI-driven control aligned with AD9691's memory map.

Is the AD9691-1250EBZ RoHS compliant and suitable for industrial temperature operation?

Yes. The AD9691-1250EBZ implements the AD9691 IC in its industrial-grade Pb-free 88-lead LFCSP package, rated for −40°C to +85°C operation. All board components, PCB finish, and assembly processes comply with RoHS Directive 2011/65/EU. Thermal design includes EPAD grounding and copper pour optimization to maintain junction temperatures within limits under full-load conditions - validated per AD9691's θJA and ΨJB thermal metrics.