Analog Devices Inc. LTC2261IUJ-14#TRPBF

Overview

LTC2261IUJ-14#TRPBF from Analog Devices (formerly Linear Technology) is a 14-bit, 125Msps ultralow-power analog-to-digital converter optimized for high-frequency signal digitization in communications systems. It delivers 73.4dB SNR, 85dB SFDR, and 0.17psRMS jitter with single 1.8V supply, CMOS/DDR CMOS/DDR LVDS outputs, and 800MHz full-power bandwidth - enabling undersampling of IF signals in cellular base stations and software-defined radios.

For engineers reviewing the LTC2261IUJ-14#TRPBF datasheet, LTC2261IUJ-14#TRPBF pinout, LTC2261IUJ-14#TRPBF application, or LTC2261IUJ-14#TRPBF equivalent, key selection criteria include its guaranteed ±1LSB INL over temperature, selectable 1–2VP-P input range, optional clock duty cycle stabilizer, serial SPI configuration interface, and industrial-grade –40°C to +85°C operation in 40-pin QFN.

Technical Context

The LTC2261IUJ-14#TRPBF employs a 14-bit pipelined ADC core with correction logic and a high-fidelity sample-and-hold stage featuring 800MHz full-power bandwidth and 0.17psRMS aperture jitter. Its architecture supports differential or single-ended encode inputs (ENC+/ENC–) and configurable digital output modes - full-rate CMOS, double-data-rate CMOS, or double-data-rate LVDS - each with independent OVDD supply control.

Dual reference options are supported: internal 1.25V reference (±1LSB INL, ±0.3LSB DNL) or external reference via SENSE pin (0.625V–1.3V), enabling precise input range selection (1VP-P or 2VP-P). Power management includes Nap (9mW) and Sleep (0.5mW) modes, while SPI port allows real-time configuration of randomizer, duty cycle stabilizer, and output format.

Key Specifications

Pinout & Package

40-lead (6mm × 6mm) plastic QFN package with exposed thermal pad (Pin 41 = GND), optimized for high-frequency analog layout and thermal dissipation in RF front-end designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9246BCPZ-125, LTC2261IUJ-14#TRPBF offers integrated reference and flexible outputs but trades 1.1dB SNR; versus LTC2263IUJ-14#TRPBF, it delivers +60Msps and +3dB SFDR at +62mW power - making it optimal for wideband IF sampling where performance outweighs power constraints.

Availability

LTC2261IUJ-14#TRPBF is available at Aetrix Electronics and suitable for cellular infrastructure, software-defined radio development, and portable medical imaging requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2261IUJ-14#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and RF ICs, serving precision instrumentation, communications, and industrial markets.

The LTC2261 series belongs to Linear's high-speed ADC product line, designed specifically for demanding communications applications requiring ultralow jitter, wide bandwidth, and flexible digital interfacing in compact QFN packages.

FAQ

What is the maximum sampling rate supported by the LTC2261IUJ-14#TRPBF?

The LTC2261IUJ-14#TRPBF supports a maximum sampling rate of 125Msps, validated across its full industrial temperature range (–40°C to +85°C). This rate is specified with sine-wave input, 2VP-P differential drive, and LVDS outputs disabled. At 125Msps, the device achieves 73.4dB SNR and 85dB SFDR at 70MHz input frequency, confirming sustained high-speed performance under real-world conditions.

Does the LTC2261IUJ-14#TRPBF support both internal and external voltage references?

Yes, the LTC2261IUJ-14#TRPBF supports dual reference modes via the SENSE pin (Pin 39). Connecting SENSE to VDD selects the internal 1.25V reference with ±1LSB INL; connecting to GND selects ±0.5V input range; applying 0.625–1.3V externally enables custom reference scaling. Internal reference output (VREF, Pin 38) is buffered and specified at 1.250V ±0.025V with ±25ppm/°C drift.

How does the clock duty cycle stabilizer function in the LTC2261IUJ-14#TRPBF?

The clock duty cycle stabilizer in the LTC2261IUJ-14#TRPBF corrects asymmetric ENC+/ENC– clock waveforms internally, allowing high-performance operation even with duty cycles from 20% to 80%. It is enabled by driving CS high in parallel programming mode and reduces timing skew between rising/falling edge sampling paths - critical for maintaining SFDR >85dB at full 125Msps rate.

What digital output formats are available on the LTC2261IUJ-14#TRPBF?

The LTC2261IUJ-14#TRPBF supports three digital output formats: full-rate CMOS (14 single-ended D0–D13 outputs), double-data-rate CMOS (7 pins carrying two bits per clock edge), and double-data-rate LVDS (7 differential pairs). Output mode is selected via SCK pin state in parallel programming mode, and OVDD voltage sets CMOS swing (1.2–1.8V) or enables LVDS termination (100Ω on-chip).

Is the LTC2261IUJ-14#TRPBF pin-compatible with other devices in the LTC226x family?

Yes, the LTC2261IUJ-14#TRPBF is pin-compatible with the LTC2260-14 and LTC2259-14, sharing identical 40-pin QFN (UJ) packaging, pin functions, and PCB footprint. This allows direct substitution across 125Msps (LTC2261), 105Msps (LTC2260), and 80Msps (LTC2259) variants without layout changes - simplifying design scalability and inventory management for multi-tier product families.