Analog Devices Inc. DC1762A-A

Overview

DC1762A-A from Analog Devices (formerly Linear Technology) is a high-performance evaluation board for the LTC2165 16-bit, 125Msps analog-to-digital converter. It enables full characterization of AC performance (76.8dB SNR, 90dB SFDR), ultralow jitter (0.07psRMS), and DC accuracy (±2LSB INL) in undersampling IF receiver applications. The board supports differential analog input, selectable CMOS/LVDS output modes, and SPI configuration.

For engineers reviewing the DC1762A-A datasheet, DC1762A-A pinout, DC1762A-A application, or DC1762A-A equivalent, this page delivers verified hardware interface details, clocking architecture notes, layout-validated signal integrity guidance, and direct mapping to LTC2165 production design constraints - all critical for base station RF front-end, software-defined radio, and portable medical imaging ADC subsystem validation.

Technical Context

The DC1762A-A implements a complete signal chain around the LTC2165, featuring a transformer-coupled 550MHz full-power bandwidth analog input path with precise 1–2VP-P range selection, on-board 1.8V LDOs for VDD/OVDD, and configurable termination for LVDS/CMOS outputs. Clock conditioning includes differential ENC+/- inputs with optional duty cycle stabilizer support.

It integrates a serial SPI interface (CS/SCK/SDI/SDO) for real-time mode control (output format, randomizer, nap/sleep), parallel programming via PAR/SER pin, and on-board reference circuitry (VREF = 1.25V ±1%, VCM = VDD/2 ±25mV). All power domains are independently bypassed per LTC2165 layout guidelines.

Key Specifications

Availability

DC1762A-A is available at Aetrix Electronics and suitable for cellular base station development, SDR prototyping, and portable medical ultrasound systems requiring stable component supply, traceable evaluation hardware, and documented signal integrity validation.

Supply support for DC1762A-A 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 data conversion.

The DC1762A-A belongs to Analog Devices' LTC evaluation board family, designed specifically to accelerate time-to-validation for high-speed ADCs used in demanding communications and instrumentation applications where dynamic range, jitter sensitivity, and layout fidelity are critical.

FAQ

What is the primary function of the DC1762A-A evaluation board?

The DC1762A-A evaluation board is a fully assembled and tested platform for evaluating the LTC2165 16-bit, 125Msps analog-to-digital converter. It provides immediate access to all key interfaces - analog input, clock, digital outputs, and SPI control - enabling rapid validation of AC performance (SNR, SFDR), timing behavior, and system-level integration without custom PCB design. DC1762A-A supports both differential and single-ended encode modes and all three output formats (CMOS, DDR CMOS, DDR LVDS).

Does the DC1762A-A support the full 125Msps sample rate of the LTC2165?

Yes, the DC1762A-A is designed and validated to operate the LTC2165 at its maximum rated sample rate of 125Msps. Its layout adheres strictly to Linear Technology's high-speed ADC layout recommendations, including controlled-impedance traces, isolated ground planes, and optimized power delivery - ensuring measured performance matches the datasheet specifications: 76.8dB SNR and 90dB SFDR at 125Msps with 70MHz input.

Can the DC1762A-A be used with external clock sources other than differential sine waves?

Yes, the DC1762A-A accepts multiple clock input types via its ENC+/ENC– terminals, including differential sine wave, PECL, LVDS, TTL, and CMOS signals - as specified for the LTC2165. The board includes configurable termination and AC coupling options to accommodate these drive styles. An optional clock duty cycle stabilizer (enabled via SPI or parallel mode) ensures consistent performance across wide duty cycle ranges, critical for non-ideal clock sources.

How does the DC1762A-A handle analog input common-mode voltage requirements?

The DC1762A-A uses the LTC2165's internal VCM output (Pin 1) - nominally VDD/2 ±25mV - to bias the analog input common-mode level. This eliminates need for external bias networks and ensures optimal linearity and noise performance. The board routes VCM directly to the center-tap of the input transformer and provides dedicated 0.1µF bypassing, matching the exact implementation recommended in the LTC2165 datasheet for 1–2VP-P differential input operation.

Is SPI communication supported on the DC1762A-A, and what functions can it configure?

Yes, the DC1762A-A fully supports the LTC2165's 4-wire SPI interface (CS, SCK, SDI, SDO) for real-time configuration of operating modes. Functions controllable via SPI include output data format (parallel/DDR), randomizer enable/disable, clock duty cycle stabilizer enable, nap/sleep mode entry, and LVDS current mode selection (1.75mA or 3.5mA). All registers are accessible for readback, enabling full visibility into device state during evaluation of DC1762A-A.