Analog Devices Inc. LTC2252IUH#PBF

Overview

LTC2252IUH#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 105Msps low-power pipelined analog-to-digital converter optimized for high-frequency signal digitization in communications and imaging systems. It operates from a single 3V supply (2.85V–3.4V), delivers 70.2dB SNR and 88dB SFDR at 5MHz input, supports ±0.5V to ±1V differential input range, and features clock duty cycle stabilization for robust timing performance.

For engineers reviewing the LTC2252IUH#PBF datasheet, LTC2252IUH#PBF pinout, LTC2252IUH#PBF application, or LTC2252IUH#PBF equivalent, key selection criteria include its 105Msps sampling rate, 640MHz full-power bandwidth, shutdown/nap modes for power management, flexible reference configuration via SENSE pin, and compatibility with 0.5V–3.6V output logic levels.

Technical Context

The LTC2252IUH#PBF implements a six-stage CMOS pipelined ADC architecture with 5-cycle pipeline latency, enabling deterministic timing for real-time signal processing. Its sample-and-hold circuit features 640MHz full-power bandwidth and 0.2ps RMS aperture jitter, supporting accurate digitization of wideband RF and IF signals up to Nyquist frequency.

It integrates a programmable internal 1.5V VCM reference, configurable input range (±0.5V/±1V) via SENSE pin voltage selection, and dual-mode output formatting (offset binary or 2's complement) controlled by MODE pin. Clock duty cycle stabilization allows high AC performance across wide input clock duty cycles without external correction circuitry.

Key Specifications

Pinout & Package

Package: 32-lead (5mm × 5mm) QFN with exposed thermal pad (Pin 33 = GND), RoHS-compliant, lead-free (PBF).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9226ASTZ-105, LTC2252IUH#PBF offers lower power and integrated clock stabilization but trades off some legacy support; versus LTC2254IUH#PBF, it delivers identical speed and footprint with lower power and cost at the expense of 2-bit resolution - ideal for cost-sensitive 12-bit IF sampling systems.

Availability

LTC2252IUH#PBF is available at Aetrix Electronics and suitable for wireless infrastructure, medical ultrasound, portable instrumentation, and test & measurement applications requiring stable component supply, extended temperature operation (–40°C to +85°C), and long-term obsolescence management.

Supply support for LTC2252IUH#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 LTC2252IUH#PBF belongs to ADI's high-speed precision ADC product line, designed specifically for demanding digitization tasks in communications receivers, medical imaging, and instrumentation where low power, high linearity, and robust timing performance are critical.

FAQ

What is the operating temperature range for the LTC2252IUH#PBF?

The LTC2252IUH#PBF is rated for industrial temperature operation from –40°C to +85°C (I-grade), as confirmed by the "LTC2252I" marking in the ordering information table and absolute maximum ratings section of the datasheet. This makes LTC2252IUH#PBF suitable for deployment in outdoor wireless equipment and portable medical devices exposed to ambient thermal variation.

Does the LTC2252IUH#PBF require an external reference voltage?

No, the LTC2252IUH#PBF includes an internal 1.5V bandgap reference and supports fully self-contained operation using only the SENSE pin to configure input range (±0.5V or ±1V). External references may be used via REFH/REFL pins for improved stability, but are not required - a key advantage of LTC2252IUH#PBF in space-constrained designs.

How does the clock duty cycle stabilizer in the LTC2252IUH#PBF improve system performance?

The clock duty cycle stabilizer in LTC2252IUH#PBF actively corrects input clock asymmetry, enabling full 105Msps AC performance even with duty cycles between 40% and 60%. This eliminates the need for external duty cycle correction ICs or precision clock generators, reducing bill-of-materials cost and PCB area - a verified capability documented in the "Clock Duty Cycle Stabilizer" feature and timing specifications tables for LTC2252IUH#PBF.

Can the LTC2252IUH#PBF interface directly with a 1.8V FPGA I/O bank?

Yes, the LTC2252IUH#PBF supports OVDD from 0.5V to 3.6V, and its digital outputs are specified for VOH ≥1.79V and VOL ≤0.09V at OVDD = 1.8V and IO = –200µA / 1.6mA. This ensures reliable LVCMOS18-level signaling, allowing direct connection to 1.8V FPGA I/O banks without level-shifting circuitry - a design feature explicitly validated in the "Digital Inputs and Outputs" section of the LTC2252IUH#PBF datasheet.

What is the pipeline latency of the LTC2252IUH#PBF, and how does it affect system synchronization?

The LTC2252IUH#PBF has a fixed 5-cycle pipeline latency from CLK rising edge to valid D0–D11 output, as stated in the "Timing Characteristics" table and confirmed by the functional block diagram. This deterministic latency enables precise time-of-flight calculations in ultrasound beamforming and simplifies FPGA-based FIFO alignment in real-time digital downconverters using LTC2252IUH#PBF.