Analog Devices Inc. LTC2242IUP-12#PBF

Overview

LTC2242IUP-12#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 250Msps pipelined analog-to-digital converter optimized for high-frequency signal digitization in communications infrastructure. It delivers 65.4dB SNR, 78dB SFDR at 10MHz input, and 95fsRMS aperture jitter, enabling IF undersampling in wireless base stations and cable head-end systems.

For engineers reviewing the LTC2242IUP-12#PBF datasheet, LTC2242IUP-12#PBF pinout, LTC2242IUP-12#PBF application, or LTC2242IUP-12#PBF equivalent, key selection criteria include full-power bandwidth (1.2GHz), ±0.5V/±1V selectable input range, LVDS/CMOS/demuxed CMOS output flexibility, clock duty cycle stabilization, and industrial temperature support (–40°C to +85°C).

Technical Context

The LTC2242IUP-12#PBF implements a five-stage pipelined ADC architecture with integrated sample-and-hold, correction logic, and flexible reference buffering. Its differential analog input path supports ±0.5V or ±1V ranges via SENSE pin programming, and internal 1.25V VCM bias ensures stable common-mode operation.

Digital interface options include LVDS (247–454mV differential swing), full-rate CMOS (0.5–2.625V OVDD), or demultiplexed CMOS with interleaved/simultaneous update modes. Clock acceptance covers PECL, LVDS, TTL, and CMOS inputs, with optional duty cycle stabilization active over wide input duty cycles.

Key Specifications

Pinout & Package

64-pin 9mm × 9mm QFN package with exposed thermal pad (Pin 65 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS54J60IRGC and LTC2262IUP-12#PBF, the LTC2242IUP-12#PBF uniquely balances 250Msps speed, parallel LVDS/CMOS flexibility, and industrial temperature rating in a proven 64-pin QFN - making it optimal for legacy FPGA-based RF platforms requiring drop-in upgrade paths and deterministic timing.

Availability

LTC2242IUP-12#PBF is available at Aetrix Electronics and suitable for wireless infrastructure, cable head-end systems, and RF test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2242IUP-12#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 communications, industrial, automotive, and healthcare markets.

The LTC2242IUP-12#PBF belongs to Linear Technology's high-speed ADC product line, engineered specifically for demanding communications applications requiring ultra-low jitter, wide full-power bandwidth, and robust AC performance in harsh environments.

FAQ

What is the operating temperature range for the LTC2242IUP-12#PBF?

The LTC2242IUP-12#PBF is rated for industrial operation from –40°C to +85°C. This specification is guaranteed per the device's ordering information and validated across all AC and DC parameters in the datasheet, including SNR, SFDR, INL, and DNL. The "I" grade designation explicitly confirms this extended range, distinguishing it from the commercial-grade C-version (0°C to 70°C).

Does the LTC2242IUP-12#PBF support both LVDS and CMOS digital outputs?

Yes, the LTC2242IUP-12#PBF supports three output configurations: LVDS, full-rate CMOS, and demultiplexed CMOS (with interleaved or simultaneous update). Output mode is selected via the LVDS pin (Pin 57): tying it to VDD enables LVDS, while grounding selects full-rate CMOS. The MODE pin (Pin 58) further configures format and clock stabilization. All modes are fully supported across the –40°C to +85°C range.

What is the function of the SENSE pin on the LTC2242IUP-12#PBF?

The SENSE pin (Pin 59) configures both input range and reference source. Connecting SENSE to VCM selects ±0.5V range with internal reference; connecting to VDD selects ±1V range; applying an external voltage between 0.5V and 1V sets ±VSENSE range. This allows precise scaling of analog input without external op-amps, directly supporting common IF signal levels in communications systems using the LTC2242IUP-12#PBF.

How does the clock duty cycle stabilizer work in the LTC2242IUP-12#PBF?

The LTC2242IUP-12#PBF's clock duty cycle stabilizer, enabled via the MODE pin (Pin 58), corrects input clock asymmetry to maintain optimal aperture timing. It operates independently of encode frequency and preserves 95fsRMS jitter performance even with duty cycles from 30% to 70%. This feature eliminates need for external clock conditioning circuits when using crystal oscillators or PLLs with variable duty cycle.

What package type and thermal considerations apply to the LTC2242IUP-12#PBF?

The LTC2242IUP-12#PBF uses a 64-lead 9mm × 9mm plastic QFN with exposed thermal pad (Pin 65). This pad must be soldered to a PCB ground plane to achieve θJA = 20°C/W and prevent junction temperature exceedance. Thermal design requires ≥4 thermal vias under the pad and adequate copper area; failure to do so risks thermal shutdown or parametric drift above 85°C ambient.