Analog Devices Inc. DC919A-D

Overview

DC919A-D from Analog Devices (formerly Linear Technology) is a fully populated, RoHS-compliant demonstration board for the LTC2205 16-bit, 65Msps analog-to-digital converter. It features differential analog input with PGA front end, 79dB SNR at 5MHz, 100dB SFDR, and ultralow 90fsRMS aperture jitter - enabling high-fidelity undersampling of RF signals up to 700MHz in communications receiver applications.

For engineers reviewing the DC919A-D datasheet, DC919A-D pinout, DC919A-D application, or DC919A-D equivalent, this page delivers verified board-level specifications, signal integrity validation data, clock interface configuration options, and direct integration guidance for LTE/5G base station receivers, spectrum analyzers, and ATE systems requiring >70dB SFDR at IF frequencies above 100MHz.

Technical Context

The DC919A-D implements the LTC2205 ADC in a fixed-configuration evaluation platform with optimized layout for wideband analog signal integrity: 50Ω single-ended and 100Ω differential input paths, on-board transformer-coupled clock conditioning, and separate analog/digital ground planes. It supports both differential sine-wave and LVDS clock inputs via the ENC+/ENC– interface, with optional duty cycle stabilizer enabled by default.

Signal routing follows strict high-speed ADC layout rules - including controlled-impedance traces (50Ω/100Ω), minimized stub lengths, and dedicated power delivery networks for VDD (3.3V), OVDD (1.8V/2.5V/3.3V selectable), and analog reference - ensuring measured performance matches LTC2205 datasheet specs across temperature and sample rate (65Msps).

Key Specifications

Availability

DC919A-D is available at Aetrix Electronics and suitable for LTE base station receivers, spectrum analysis instrumentation, and automated test equipment requiring stable component supply, traceable calibration history, and documented signal integrity validation.

Supply support for DC919A-D 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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving communications, industrial, automotive, and healthcare markets.

The DC919A-D belongs to ADI's Linear Technology legacy evaluation board family, designed specifically to accelerate prototyping and performance validation of high-speed data converters in RF and instrumentation applications.

FAQ

What is the primary function of the DC919A-D evaluation board?

The DC919A-D evaluation board is a hardware platform designed to demonstrate and validate the performance of the LTC2205 16-bit, 65Msps analog-to-digital converter. It provides ready-to-use signal paths, clock conditioning, power regulation, and FPGA-compatible digital outputs - allowing engineers to rapidly evaluate AC/DC specifications, verify layout practices, and integrate the LTC2205 into receiver or test systems without custom PCB development. The DC919A-D itself is not an IC but a complete functional subsystem.

Does the DC919A-D support both LTC2205 and LTC2204 variants?

No - the DC919A-D is specifically configured for the LTC2205 (65Msps) and is not compatible with the LTC2204 (40Msps). While both devices share the same 48-pin QFN package and pinout, the DC919A-D's clock distribution network, power delivery, and firmware are optimized for 65Msps operation and full-speed timing margins. Using it with LTC2204 would require revalidation of setup/hold times, jitter sensitivity, and thermal behavior - which is not supported by the board's design or documentation.

Can the DC919A-D operate with single-ended analog inputs?

No - the DC919A-D implements only a differential analog input path using a Mini-Circuits TC1-1-13M+ broadband transformer. It does not provide provisions for single-ended AIN+ or AIN– termination, nor does it include resistor networks for converting single-ended signals to differential. The board assumes balanced drive per LTC2205's recommended input configuration; attempting single-ended drive will degrade CMRR, increase even-order distortion, and invalidate published SNR/SFDR results.

What clock input types does the DC919A-D accept?

The DC919A-D accepts differential LVDS or sine-wave clock inputs via its SMA-connected ENC+/ENC– interface. It includes on-board AC coupling, common-mode biasing, and a configurable duty cycle stabilizer - supporting clock sources with 40%–60% duty cycle without external correction. PECL, TTL, and CMOS clocks are not directly supported due to incompatible voltage levels and termination requirements; level-shifting circuitry would be required for those interfaces.

Is the DC919A-D compatible with modern FPGA development tools?

Yes - the DC919A-D outputs parallel CMOS data (D[15:0], OF, CLKOUT±) at standard logic levels (1.8V/2.5V/3.3V selectable), making it directly compatible with Xilinx Kintex-7, Virtex-7, and Intel Cyclone V/Arria 10 FPGA development kits. Reference HDL code, timing constraints, and Vivado/Quartus project examples are provided in the official DC919A-D user guide, enabling immediate data capture and FFT analysis without custom interface logic.