Analog Devices Inc. LTC2165CUK#PBF

Overview

LTC2165CUK#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 125Msps low-power analog-to-digital converter optimized for undersampling high-frequency IF signals in communications infrastructure. It delivers 76.8dB SNR, 90dB SFDR, and ultralow 0.07psRMS jitter, with ±2LSB INL and ±0.5LSB DNL over temperature - enabling high-fidelity digitization in cellular base stations and software-defined radios.

For engineers reviewing the LTC2165CUK#PBF datasheet, LTC2165CUK#PBF pinout, LTC2165CUK#PBF application, or LTC2165CUK#PBF equivalent, this page provides verified package mapping (48-lead 7mm × 7mm QFN), confirmed CMOS/LVDS output modes, validated clock interface behavior (differential/single-ended ENC±), real-world power consumption (194mW at 125Msps), and two rigorously cross-checked alternative ADCs for similar wideband sampling applications.

Technical Context

The LTC2165CUK#PBF implements a pipeline ADC architecture with integrated sample-and-hold (550MHz full-power bandwidth), configurable digital outputs (full-rate CMOS, DDR CMOS, or DDR LVDS), and on-chip reference generation (1.25V VREF, VCM = VDD/2). Its serial SPI port enables runtime configuration of clock duty cycle stabilization, data randomization, and power modes (Nap/Sleep).

It supports differential or single-ended encode inputs (ENC+/ENC–), programmable input range (1VP-P to 2VP-P), and flexible reference options (internal or external via SENSE pin). The device operates from a single 1.8V analog supply (VDD) and separate 1.2V–1.8V output supply (OVDD), with independent ground planes (GND and OGND) for analog and digital output domains.

Key Specifications

Pinout & Package

48-lead (7mm × 7mm) plastic QFN package with exposed thermal pad (Pin 49 = GND, must be soldered to PCB). Dual ground domains: GND (analog power ground, Pins 4,10,11,14,20,43) and OGND (output driver ground, Pin 31).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed ADC applications.

Compared with AD9268BCPZ-125 and ADS54J60IRGC, the LTC2165CUK#PBF offers optimal balance of parallel interface simplicity, ultra-low jitter (0.07psRMS vs ≥0.12psRMS), and sub-200mW power - making it the preferred choice for cost-sensitive, thermally constrained, and FPGA-I/O-limited wideband digitization tasks.

Availability

LTC2165CUK#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, software-defined radio development, and portable medical imaging systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LTC2165CUK#PBF 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 industrial, automotive, communications, and healthcare markets.

The LTC2165CUK#PBF belongs to ADI's high-speed precision ADC product line, designed specifically for demanding communications and instrumentation applications requiring exceptional dynamic range, low jitter, and flexible digital interfacing.

FAQ

What is the operating temperature range for the LTC2165CUK#PBF?

The LTC2165CUK#PBF is rated for 0°C to 70°C ambient operation, as indicated by the "C" grade suffix in its part number. This commercial-grade specification makes it suitable for indoor base station equipment, lab-grade test instruments, and non-mission-critical portable systems where extended industrial temperature range is not required. The device maintains full performance (including ±2LSB INL and 76.8dB SNR) across this range.

Does the LTC2165CUK#PBF require an external reference voltage?

No, the LTC2165CUK#PBF includes an internal 1.25V reference (VREF pin) with ±1.2% accuracy and ±25ppm/°C drift, fully adequate for most communications and instrumentation applications. An external reference can be applied via the SENSE pin (0.625V–1.3V range) only if higher absolute accuracy or lower drift is required - but doing so disables the internal reference and adds design complexity.

Can the LTC2165CUK#PBF interface directly with a Xilinx Artix-7 FPGA using LVDS outputs?

Yes, the LTC2165CUK#PBF supports DDR LVDS outputs with 100Ω on-chip termination and 247–454mV differential swing - fully compliant with Xilinx Artix-7 LVDS I/O standards (DCI-terminated, 1.8V VCCO). The CLKOUT± pair provides a synchronous source-synchronous clock, and pipeline latency is fixed at 6.5 cycles, enabling deterministic timing closure in Vivado.

How does the clock duty cycle stabilizer affect power consumption in the LTC2165CUK#PBF?

Enabling the clock duty cycle stabilizer in the LTC2165CUK#PBF increases power consumption by a fixed 20mW (PDIFFCLK parameter), regardless of sampling rate or output mode. This overhead is justified when using asymmetric clock sources (e.g., microcontroller-generated clocks), as it preserves the full 76.8dB SNR and 90dB SFDR - whereas disabling it with poor-duty-cycle clocks degrades SFDR by up to 12dB.

What is the function of the PAR/SER pin on the LTC2165CUK#PBF?

The PAR/SER pin on the LTC2165CUK#PBF selects between two configuration interfaces: grounded (0V) enables full-featured SPI serial programming (CS/SCK/SDI/SDO), while tied to VDD enables simplified parallel mode where CS/SCK/SDI control basic functions (clock stabilizer, output mode, power state) without requiring a dedicated SPI controller. This dual-mode flexibility reduces firmware overhead in resource-constrained microcontroller-based systems.