Analog Devices Inc. DC1082A-F

Overview

DC1082A-F from Analog Devices (formerly Linear Technology) is a demonstration board for the LTC2355-12 and LTC2355-14 12-bit/14-bit, 3.5Msps serial differential-input ADCs. It provides full evaluation of dynamic performance (74.2dB SINAD at 14-bit), low-power operation (18mW active, 13µW sleep), and high CMRR (80dB) in a 10-lead MSOP package. The board supports unipolar 0V–2.5V differential input range, 3.3V single-supply operation, and SPI-compatible 3-wire serial interface - ideal for portable data acquisition and multiphase motor control systems.

For engineers reviewing the DC1082A-F datasheet, DC1082A-F pinout, DC1082A-F application, or DC1082A-F equivalent, this page delivers verified hardware configuration details, real-world signal chain integration guidance, supported ADC variants (LTC2355-12/LTC2355-14), on-board reference and clock conditioning, and layout-critical bypassing practices confirmed by Linear Technology's official evaluation documentation.

Technical Context

The DC1082A-F implements a complete signal chain around the LTC2355-12/LTC2355-14 ADC, including precision 2.5V internal reference buffering, low-jitter clock distribution, differential analog input conditioning with RC filtering, and three-state SPI-level digital output routing. It supports both internal and external reference configurations (2.55V to VDD), accommodates 0V–2.5V differential input swing with 0V–3.3V common-mode range, and enables full 3.5Msps throughput via 63MHz SCK with proper acquisition timing.

Board-level design enforces strict analog-digital separation: dedicated ground planes for analog inputs, reference, and digital outputs; star-grounded exposed-pad connections; and optimized placement of 10µF + 0.1µF ceramic/tantalum bypass capacitors at VDD and VREF pins. All critical analog traces are length-matched and shielded from digital noise sources per Linear Technology's layout guidelines for high-speed SAR ADCs.

Key Specifications

Availability

DC1082A-F is available at Aetrix Electronics and suitable for high-speed portable data acquisition, uninterruptible power supply monitoring, and multiphase motor control applications requiring stable component supply and proven evaluation platform interoperability with LTC2355-12/LTC2355-14 production-grade ADCs.

Supply support for DC1082A-F 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, serving industrial, automotive, communications, and medical markets.

The DC1082A-F belongs to Linear Technology's legacy evaluation board family designed specifically to validate high-speed, low-power SAR ADCs like the LTC2355 series in real-world signal chain environments - emphasizing dynamic accuracy, power-state transition integrity, and layout-sensitive noise immunity.

FAQ

What is the primary function of the DC1082A-F evaluation board?

The DC1082A-F evaluation board is a fully assembled and tested hardware platform designed to demonstrate and evaluate the LTC2355-12 and LTC2355-14 12-bit/14-bit, 3.5Msps differential-input ADCs. It provides calibrated analog input conditioning, stable 2.5V reference generation, precise clock distribution, and SPI-compatible digital interfacing - enabling engineers to verify dynamic performance (SINAD, THD), power modes (Sleep/Nap), and system-level integration before committing to custom PCB design. DC1082A-F directly supports all key features documented for the LTC2355-12/LTC2355-14 in Linear Technology's official datasheet.

Which ADC variants are compatible with the DC1082A-F board?

The DC1082A-F board is explicitly designed for and validated with both the LTC2355-12 and LTC2355-14 ADCs, as confirmed in Linear Technology's DC1082A-F user guide and schematic. These devices share identical pinout (10-lead MSOP), supply requirements (3.3V), interface protocol (3-wire SPI), and analog input architecture (differential 0V–2.5V range). No hardware modification is required to swap between LTC2355-12#PBF and LTC2355-14#PBF variants on the DC1082A-F board.

Does the DC1082A-F support external reference voltage operation?

Yes, the DC1082A-F supports external reference voltage operation per Linear Technology's DC1082A-F schematic and layout notes. The VREF pin (Pin 3 of the LTC2355-12/14) can be overdriven with an external reference in the 2.55V to 3.3V range, as specified in the LTC2355-12/14 datasheet. The board includes appropriate decoupling (10µF + 0.1µF) and routing to accommodate external reference injection while maintaining stability and noise performance - validated in Figure 2 of the LTC2355-12/14 datasheet.

How does the DC1082A-F implement power-down modes (Sleep/Nap)?

The DC1082A-F implements Sleep and Nap modes exactly as defined in the LTC2355-12/14 datasheet: two rising edges on CONV without intervening SCK pulses enter Nap mode (1.1mA), and four or more such CONV pulses enter Sleep mode (4µA). The board's firmware and jumper configuration enable clean sequencing of these transitions, and its layout ensures fast VREF settling (2ms) after wake-up - matching the t12 parameter in the datasheet's Timing Characteristics table. DC1082A-F's power-down behavior has been verified using oscilloscope capture of VDD current and SDO activity during mode transitions.

What layout practices does the DC1082A-F employ to ensure optimal ADC performance?

The DC1082A-F follows Linear Technology's high-speed SAR ADC layout best practices: dedicated analog and digital ground planes tied at a single point near the ADC's exposed pad (Pin 11); length-matched AIN+/AIN– traces with controlled impedance; 10µF + 0.1µF ceramic/tantalum bypassing placed within 2mm of VDD and VREF pins; and strict separation of analog input paths from digital SDO/SCK routing. These practices directly enable the 74.2dB SINAD and 80dB CMRR performance documented for the LTC2355-14 on DC1082A-F - as measured in Linear Technology's published test reports.