Analog Devices Inc. LTC2222CUK#PBF

Overview

LTC2222CUK#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 105Msps pipelined analog-to-digital converter optimized for high-frequency signal digitization in communications infrastructure. It delivers 68dB SNR at 140MHz input, 80dB SFDR up to 170MHz, and ultralow 0.15psRMS aperture jitter. Designed for IF sampling in wireless base stations and cable head-end systems, it operates from a single 3.3V supply with 475mW power dissipation.

For engineers reviewing the LTC2222CUK#PBF datasheet, LTC2222CUK#PBF pinout, LTC2222CUK#PBF application, or LTC2222CUK#PBF equivalent, key selection criteria include its 105Msps sample rate, ±0.5V/±1V selectable input range, flexible reference architecture, and 48-pin QFN package with separate OVDD for logic-level compatibility across 0.5V–3.6V digital interfaces.

Technical Context

The LTC2222CUK#PBF implements a five-stage CMOS pipelined ADC architecture with integrated sample-and-hold, correction logic, and output drivers. Its differential analog input path supports both differential and single-ended drive, while the ENC+/ENC– clock interface accepts PECL, LVDS, TTL, or CMOS signals with optional duty cycle stabilization.

It features a 775MHz full-power bandwidth S/H stage, programmable output format (offset binary or 2's complement), and three low-power modes: shutdown (2mW), nap (35mW), and normal operation. The internal 1.6V VCM reference and SENSE pin enable precise ±0.5V or ±1V input range selection without external components.

Key Specifications

Pinout & Package

48-lead 7mm × 7mm plastic QFN (UK package) with exposed GND pad requiring soldering to PCB thermal plane. Pin 49 (exposed pad) is GND and must be electrically and thermally connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9230-105EBZ, LTC2222CUK#PBF offers superior integration (internal VCM, duty cycle stabilizer, flexible reference) and lower power, while LTC2223CUK#PBF provides a pin-compatible, lower-power alternative for reduced IF bandwidth applications without layout changes.

Availability

LTC2222CUK#PBF is available at Aetrix Electronics and suitable for wireless infrastructure, cable head-end systems, and power amplifier linearization requiring stable component supply across extended production lifecycles.

Supply support for LTC2222CUK#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and RF ICs, serving aerospace, industrial, automotive, and communications markets with precision signal chain solutions.

The LTC2222CUK#PBF belongs to Linear Technology's high-speed ADC product line, designed specifically for demanding communications applications where wide dynamic range, low jitter, and flexible interface options are essential for IF sampling and digital radio architectures.

FAQ

What is the operating temperature range for the LTC2222CUK#PBF?

The LTC2222CUK#PBF is specified for commercial temperature operation from 0°C to 70°C, as indicated by the "C" grade suffix in the part number. This range is validated per the Absolute Maximum Ratings table and applies to all AC and DC specifications unless otherwise noted in the Electrical Characteristics section.

Does the LTC2222CUK#PBF require an external reference voltage?

No, the LTC2222CUK#PBF includes an internal 1.6V VCM reference and supports fully self-contained operation using the SENSE pin to configure ±0.5V or ±1V input ranges. External references are optional and only needed when custom input scaling beyond ±1V is required.

How does the MODE pin affect output formatting and clock functionality in the LTC2222CUK#PBF?

The MODE pin on the LTC2222CUK#PBF selects both output data format and clock duty cycle stabilizer state: grounding it sets offset binary output with stabilizer disabled; applying 1/3VDD enables offset binary with stabilizer active; 2/3VDD selects 2's complement with stabilizer on; and tying to VDD selects 2's complement with stabilizer off.

Can the LTC2222CUK#PBF interface directly with a 1.8V FPGA I/O bank?

Yes, the LTC2222CUK#PBF supports OVDD from 0.5V to 3.6V. Setting OVDD = 1.8V configures all 12 digital outputs (D0–D11), CLOCKOUT, OF, and OE to 1.8V logic levels, enabling direct connection to Xilinx Artix-7 or Intel Cyclone V HP I/O banks without level-shifting circuitry.

What is the pipeline latency of the LTC2222CUK#PBF and how does it impact system timing?

The LTC2222CUK#PBF has a fixed pipeline latency of 5 conversion cycles, meaning the digitized result for a given sample appears 5 clock periods after the corresponding ENC+ edge. This deterministic delay is critical for time-aligned feedback in DPD systems and must be compensated in FPGA-based interpolators or DSP timing engines.