Analog Devices Inc. LTC2256IUJ-12#TRPBF

Overview

LTC2256IUJ-12#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 25Msps ultralow-power analog-to-digital converter optimized for high-dynamic-range signal digitization in communications and portable instrumentation. It delivers 70.5dB SNR, 84dB SFDR, and 0.17psRMS aperture jitter with single 1.8V supply operation and supports CMOS, DDR CMOS, or DDR LVDS digital outputs - enabling direct interface to FPGAs in software-defined radio front ends.

For engineers reviewing the LTC2256IUJ-12#TRPBF datasheet, LTC2256IUJ-12#TRPBF pinout, LTC2256IUJ-12#TRPBF application, or LTC2256IUJ-12#TRPBF equivalent, key selection criteria include its 25Msps sampling rate, –40°C to +85°C industrial temperature grade, 800MHz full-power bandwidth, and configurable input range (1–2VP-P) with internal/external reference support.

Technical Context

The LTC2256IUJ-12#TRPBF implements a 12-bit pipelined ADC architecture with integrated sample-and-hold, correction logic, and programmable output drivers. Its ENC+/ENC– differential clock interface accepts sine wave, PECL, LVDS, TTL, or CMOS inputs, and optional duty cycle stabilization ensures consistent performance across wide input duty cycles.

Digital output configuration is controlled via PAR/SER pin selection between serial SPI mode (full feature control) and parallel mode (simplified operation). Output modes include full-rate CMOS (12 single-ended signals), double-data-rate CMOS (6 pairs), or double-data-rate LVDS (6 differential pairs), each with independent OVDD supply scaling from 1.2V to 1.8V (CMOS) or 1.7–1.9V (LVDS).

Key Specifications

Pinout & Package

40-pin (6mm × 6mm) plastic QFN package (UJ) with exposed thermal pad (Pin 41, GND). Requires soldering exposed pad to PCB 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 ADS5272IPFP and AD9226ASTZ, the LTC2256IUJ-12#TRPBF provides optimal balance of low power (34mW), flexible output interface (CMOS/LVDS), and advanced features (duty cycle stabilizer, SPI configurability) for new designs targeting portable, battery-constrained, or thermally sensitive applications.

Availability

LTC2256IUJ-12#TRPBF is available at Aetrix Electronics and suitable for cellular base stations, portable medical imaging, and multi-channel data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2256IUJ-12#TRPBF 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 LTC2256IUJ-12#TRPBF belongs to ADI's high-speed precision ADC product line, engineered for demanding communications and instrumentation applications where dynamic range, low power, and flexible digital interfacing are critical.

FAQ

What is the operating temperature range of the LTC2256IUJ-12#TRPBF?

The LTC2256IUJ-12#TRPBF is rated for industrial operation from –40°C to +85°C, as confirmed by the "I" grade designation in its part number and validated in the Absolute Maximum Ratings table. This makes it suitable for deployment in outdoor base stations, factory-floor test equipment, and field-deployable medical devices without derating.

Does the LTC2256IUJ-12#TRPBF support both internal and external voltage references?

Yes, the LTC2256IUJ-12#TRPBF supports both internal and external references via the SENSE pin (Pin 39). Tying SENSE to GND selects ±0.5V range with internal reference; tying to VDD selects ±1V range; applying 0.625–1.3V externally configures ±0.8×V_SENSE, enabling precise input range matching to sensor output levels.

How does the PAR/SER pin affect configuration of the LTC2256IUJ-12#TRPBF?

The PAR/SER pin determines the control interface mode: grounded for full-featured serial SPI programming (CS/SCK/SDI/SDO active), or tied to VDD for simplified parallel mode (CS controls duty cycle stabilizer, SCK selects output mode, SDI enables sleep). This dual-mode flexibility allows rapid prototyping and production optimization without hardware changes.

What digital output formats does the LTC2256IUJ-12#TRPBF support?

The LTC2256IUJ-12#TRPBF supports three output formats: full-rate CMOS (12 single-ended D0–D11), double-data-rate CMOS (6 time-multiplexed D0_1 through D10_11), and double-data-rate LVDS (6 differential pairs D0_1± through D10_11±). Output voltage swing is scalable via OVDD (1.2–1.8V for CMOS, 1.7–1.9V for LVDS).

Can the LTC2256IUJ-12#TRPBF be used in undersampling applications?

Yes, the LTC2256IUJ-12#TRPBF supports undersampling with its 800MHz full-power analog input bandwidth and 0.17psRMS aperture jitter. When sampling a 140MHz input at 25Msps, it achieves 70.1dB SNR and 83dB SFDR - confirming effective Nyquist-zone folding for RF signal capture in spectrum analyzers and cognitive radio receivers.