Analog Devices Inc. DC1620A-K

Overview

DC1620A-K from Analog Devices (formerly Linear Technology) is a 64-pin QFN evaluation board for the LTC2142-14 dual 14-bit, 65Msps analog-to-digital converter. It enables full characterization of AC performance (73.2dB SNR, 90dB SFDR), low-power operation (95mW total), and flexible digital output modes (CMOS/DDR CMOS/DDR LVDS) in high-frequency communications systems.

For engineers reviewing the DC1620A-K datasheet, DC1620A-K pinout, DC1620A-K application, or DC1620A-K equivalent, this board supports rapid validation of undersampling IF architectures, simultaneous two-channel acquisition timing, clock jitter sensitivity (<0.08ps RMS), and SPI-configurable features including duty cycle stabilizer and output randomizer.

Technical Context

The DC1620A-K implements a complete signal chain interface for the LTC2142-14, featuring transformer-coupled differential analog inputs with adjustable common-mode bias (VCM1/VCM2), precision 1.25V internal reference (VREF), and configurable ENC+/ENC– clocking with optional duty cycle stabilization. It routes all 64 pins-including dual 14-bit DDR LVDS/CMOS data buses (D1_0–D1_13, D2_0–D2_13), serial programming interface (CS/SCK/SDI/SDO), and power domains (VDD/OVDD)-to accessible test points and headers.

Board-level design includes optimized high-frequency layout: dedicated ground planes for analog (GND) and digital output (OGND) domains, 0.1μF ceramic bypassing on all VDD/OVDD pins, 2.2μF VREF decoupling, and impedance-controlled traces for ENC± and data outputs to preserve sub-0.1ps jitter integrity and >750MHz full-power bandwidth.

Key Specifications

Availability

DC1620A-K is available at Aetrix Electronics and suitable for cellular base station prototyping, software-defined radio development, and portable medical imaging system validation requiring stable component supply and fast-turn evaluation hardware.

Supply support for DC1620A-K 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 aerospace, communications, industrial, and healthcare markets.

The DC1620A-K belongs to ADI's Linear Technology evaluation board family, designed specifically to accelerate time-to-test for high-speed data converters by providing production-grade layout, calibrated signal paths, and documented configuration sequences.

FAQ

What is the primary function of the DC1620A-K evaluation board?

The DC1620A-K evaluation board is a fully assembled and tested platform for evaluating the LTC2142-14 dual 14-bit, 65Msps analog-to-digital converter. It provides direct access to all critical signals-including analog inputs, digital outputs, clock inputs, and SPI configuration lines-enabling engineers to validate AC performance (SNR, SFDR), timing behavior, power consumption, and feature functionality without custom PCB design. The board is preconfigured for optimal high-frequency operation per the LTC2142-14 datasheet recommendations.

Does the DC1620A-K support all digital output modes of the LTC2142-14?

Yes, the DC1620A-K supports full-rate CMOS, double-data-rate (DDR) CMOS, and DDR LVDS output modes of the LTC2142-14. Mode selection is implemented via onboard jumpers and controlled through the LTC2142-14's SPI interface using the DC1620A-K's CS/SCK/SDI/SDO connections. The board includes proper termination networks and routing for each mode, including 100Ω differential LVDS loads and OVDD voltage selection (1.2V/1.5V/1.8V) to match specified output swing requirements.

Can the DC1620A-K be used to evaluate the LTC2141-14 or LTC2140-14 variants?

Yes, the DC1620A-K is compatible with the LTC2141-14 (40Msps) and LTC2140-14 (25Msps) because all three devices share identical pinout, package (64-pin 9mm × 9mm QFN), register map, and interface architecture. The board's hardware design accommodates the full family, and firmware/software tools provided by Analog Devices support configuration across all speed grades. No hardware modification is required to switch between LTC2142-14, LTC2141-14, or LTC2140-14 ICs.

How does the DC1620A-K handle clock jitter and sampling synchronization?

The DC1620A-K preserves the LTC2142-14's ultra-low 0.08ps RMS jitter specification through careful layout: ENC+/ENC– differential clock inputs are routed as controlled-impedance, length-matched pairs with minimal stubs; ground return paths are low-inductance; and the board includes provisions for external low-jitter clock sources (e.g., sinusoidal, LVDS, or PECL). Simultaneous sampling integrity between Channel 1 and Channel 2 is maintained via matched trace lengths and shared clock distribution, enabling accurate two-tone FFT and crosstalk measurement (–110dBc).

What power supply requirements must be met when operating the DC1620A-K?

The DC1620A-K requires two independent, low-noise 1.8V supplies: one for the analog domain (VDD, pins 1/16/17/64) and one for the digital output drivers (OVDD, pin 42). Each supply must deliver ≥200mA and be bypassed with 0.1μF ceramic capacitors placed within 2mm of each respective pin. The VREF output (pin 62) requires a 2.2μF ceramic capacitor. Failure to meet these decoupling and current-delivery specifications will degrade SNR and SFDR performance below the rated 73.2dB and 90dB values of the LTC2142-14.