Analog Devices Inc. DC1620A-P

Overview

DC1620A-P from Analog Devices (formerly Linear Technology) is an evaluation board for the LTC2142-12, a 12-bit, 65Msps dual-channel simultaneous-sampling ADC. It enables high-fidelity digitization of wideband analog signals with 70.8dB SNR, 89dB SFDR, and ultralow 0.08psRMS jitter-critical for IF undersampling in software-defined radios and portable medical imaging systems.

For engineers reviewing the DC1620A-P datasheet, DC1620A-P pinout, DC1620A-P application, or DC1620A-P equivalent, this board provides validated signal integrity, configurable CMOS/DDR CMOS/DDR LVDS output modes, on-board clock conditioning, and SPI-based configuration-supporting rapid prototyping of high-speed dual-channel data acquisition subsystems.

Technical Context

The DC1620A-P implements a complete signal chain around the LTC2142-12, including precision differential analog input conditioning, selectable 1VP-P to 2VP-P input range, and full-rate or DDR digital output routing. Its layout maintains controlled impedance and tight ground return paths to preserve the ADC's 750MHz full-power bandwidth and sub-0.3LSB transition noise.

It supports all three output interface modes (CMOS, DDR CMOS, DDR LVDS) via jumper-selectable termination and supply configurations, and integrates a duty-cycle stabilizer and optional data randomizer-features directly accessible through onboard headers and the LTC2142-12's SPI port.

Key Specifications

Availability

DC1620A-P is available at Aetrix Electronics and suitable for software-defined radio development, portable ultrasound front-ends, and multi-channel test instrumentation requiring stable component supply and production-ready reference design validation.

Supply support for DC1620A-P 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 for precision measurement and high-speed conversion.

The DC1620A-P belongs to Analog Devices' Linear Technology Evaluation Board family, designed specifically to accelerate adoption of high-speed, low-power ADCs in communications, medical imaging, and instrumentation applications.

FAQ

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

The DC1620A-P evaluation board is a fully assembled and tested platform for evaluating the LTC2142-12 dual-channel 12-bit 65Msps ADC. It provides all necessary power regulation, clock conditioning, analog input filtering, and digital output interface options-enabling immediate characterization of AC performance, SPI configuration, and system-level integration without custom PCB design. The DC1620A-P validates real-world signal integrity for demanding applications like SDR and ultrasound.

Does the DC1620A-P support all output modes of the LTC2142-12?

Yes, the DC1620A-P supports all three digital output modes of the LTC2142-12: full-rate CMOS, double-data-rate (DDR) CMOS, and DDR LVDS. Jumper settings configure OVDD voltage (1.2V/1.5V/1.8V) and output termination, while onboard resistors and routing accommodate both single-ended and differential LVDS signaling. The DC1620A-P's layout preserves timing skew and signal integrity across all modes per the LTC2142-12's specified tSKEW ≤ 0.6ns.

Can the DC1620A-P be used with the LTC2141-12 or LTC2140-12?

Yes-the DC1620A-P is compatible with the entire LTC214x-12 family (LTC2142-12, LTC2141-12, LTC2140-12) due to identical 64-pin QFN packaging, pinout, and register map. Performance parameters scale with sample rate (65/40/25Msps), but the DC1620A-P's analog front-end, clock circuitry, and power delivery are optimized for the highest-speed variant and remain fully functional with lower-speed members. No hardware modification is required to evaluate any LTC214x-12 device.

How is the analog input range configured on the DC1620A-P?

The DC1620A-P supports selectable 1VP-P or 2VP-P differential input ranges via onboard jumpers that configure the internal reference divider network and VCM biasing. Input common-mode is set by the LTC2142-12's VCM1/VCM2 outputs (nominally VDD/2), and the board includes matched resistor networks and bypass capacitors to maintain <80dB CMRR. The DC1620A-P's input connectors accept either transformer-coupled or active-balanced drive, preserving the LTC2142-12's specified 750MHz full-power bandwidth.

What clock sources are supported by the DC1620A-P?

The DC1620A-P accepts external single-ended (TTL/CMOS) or differential (LVDS/PECL) clock inputs via SMA connectors, and also supports on-board crystal oscillator operation. Its clock conditioning circuit includes the LTC2142-12's integrated duty-cycle stabilizer, which maintains optimal encode timing across wide input duty-cycle variations-ensuring consistent 70.8dB SNR and 0.08psRMS jitter performance even with imperfect clock sources. The DC1620A-P routes CLKOUT± for feedback loop validation.