Analog Devices Inc. DC919A-G

Overview

DC919A-G from Analog Devices (formerly Linear Technology) is an evaluation board for the LTC2207-14, a 14-bit, 105Msps analog-to-digital converter optimized for high-frequency, wide-dynamic-range signal digitization up to 700MHz input bandwidth. It features 77.3dB SNR, 98dB SFDR, 80fsRMS jitter, and a PGA front end supporting 1.5VP-P or 2.25VP-P input ranges - used in cellular base station receivers and spectrum analyzers.

For engineers reviewing the DC919A-G datasheet, DC919A-G pinout, DC919A-G application, or DC919A-G equivalent, this page delivers verified functional context, layout-critical interface details, real-world performance benchmarks (e.g., SFDR >82dB at 250MHz), and validated alternative evaluation platforms compatible with the LTC2207-14 ADC core.

Technical Context

The DC919A-G implements a complete signal chain for the LTC2207-14, including differential analog input conditioning via transformer-coupled or active balun interfaces, low-noise clock distribution with optional duty cycle stabilization, and CMOS output termination matched to 0.5V–3.6V logic levels. It supports both internal (2.5V bandgap) and external (1.25V/2.5V) reference modes via the SENSE pin.

Board-level design incorporates critical high-speed layout practices: controlled-impedance 50Ω differential traces for ENC+/ENC– and AIN+/AIN–, dedicated ground planes under analog and digital sections, and multi-stage decoupling (2.2µF + 0.1µF ceramics per VDD/GND pair) to maintain <80fsRMS aperture jitter and preserve 77.3dB SNR at full sample rate.

Key Specifications

Availability

DC919A-G is available at Aetrix Electronics and suitable for cellular base station development, RF test equipment prototyping, and high-speed data acquisition systems requiring stable component supply and traceable evaluation hardware.

Supply support for DC919A-G 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies.

The DC919A-G belongs to Analog Devices' precision high-speed ADC evaluation platform family, engineered to accelerate time-to-test for communications infrastructure, instrumentation, and defense applications demanding sub-100fs jitter and >90dB SFDR.

FAQ

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

The DC919A-G evaluation board is designed exclusively to demonstrate and validate the performance of the LTC2207-14 14-bit, 105Msps analog-to-digital converter. It provides a fully laid-out, impedance-controlled signal path - including clock conditioning, analog input coupling, reference selection, and CMOS data output buffering - enabling engineers to measure real-world AC/DC specs such as SNR, SFDR, and aperture jitter without custom PCB development. The DC919A-G allows rapid characterization of the LTC2207-14 in demanding RF receiver applications.

Does the DC919A-G support both LTC2207-14 and LTC2206-14?

No - the DC919A-G is specifically configured for the LTC2207-14 (105Msps variant). While the LTC2206-14 (80Msps) shares the same 48-pin QFN package and pinout, the DC919A-G's clock circuitry, power delivery, and layout optimization are tuned for 105Msps operation and full-scale 700MHz bandwidth. Analog Devices documents DC919A-G as "for LTC2207-14"; using it with LTC2206-14 is possible but not validated for specified AC performance.

What clock sources are compatible with the DC919A-G?

The DC919A-G accepts differential sine wave, LVDS, or PECL clock inputs applied to ENC+/ENC–, with on-board AC coupling and biasing. It also supports single-ended TTL/CMOS clocks via ENC+ only (with ENC– bypassed to ground through 0.1µF). An optional clock duty cycle stabilizer (enabled via jumper) ensures <1% duty cycle error tolerance while maintaining 80fsRMS jitter - critical for undersampling high IF signals up to 250MHz.

How does the DC919A-G handle analog input common-mode voltage?

The DC919A-G routes the LTC2207-14's internal 1.25V VCM output (Pin 2) directly to the analog input network, establishing the optimal 1.25V common-mode level for AIN+/AIN–. This voltage is bypassed with ≥2.2µF ceramic capacitance as required by the datasheet. The board does not provide external VCM adjustment; common-mode compliance is fixed at 1.25V ±100mV over temperature, matching the LTC2207-14's specified range.

Can the DC919A-G be used with FPGA-based data capture systems?

Yes - the DC919A-G outputs parallel 14-bit CMOS data (D0–D13), overflow flag (OF), and source-synchronous CLKOUT±, all referenced to a user-supplied OVDD (0.5V–3.6V). Its layout includes series resistors and controlled trace lengths to ensure clean timing margins for FPGA capture at 105MHz. Reference designs from Analog Devices confirm interoperability with Xilinx Kintex-7 and Intel Arria 10 FPGAs when OVDD matches the FPGA I/O bank voltage.