Analog Devices Inc. LTC2256CUJ-14#TRPBF

Overview

LTC2256CUJ-14#TRPBF from Analog Devices (formerly Linear Technology) is a 14-bit, 25Msps ultralow-power analog-to-digital converter optimized for high-dynamic-range signal digitization in communications and instrumentation systems. It delivers 73dB SNR, 88dB SFDR, and 0.17psRMS jitter at 1.8V supply, supporting differential analog inputs up to 2VP-P and full-power bandwidth of 800MHz - ideal for portable medical imaging and multi-channel data acquisition.

For engineers reviewing the LTC2256CUJ-14#TRPBF datasheet, LTC2256CUJ-14#TRPBF pinout, LTC2256CUJ-14#TRPBF application, or LTC2256CUJ-14#TRPBF equivalent, this page provides verified specifications, QFN-40 package layout, SPI-configurable output modes (CMOS/LVDS), clock duty cycle stabilization, and validated alternatives for RF-sampling ADC selection.

Technical Context

The LTC2256CUJ-14#TRPBF implements a pipelined 14-bit ADC core with integrated sample-and-hold, correction logic, and configurable digital outputs. Its 800MHz full-power bandwidth enables undersampling of IF signals up to 140MHz while maintaining 73dB SNR at 25Msps sampling rate.

It supports three digital output configurations - full-rate CMOS, DDR CMOS, and DDR LVDS - with separate OVDD supply (1.2V–1.9V) and programmable input range (1VP-P to 2VP-P). Serial SPI interface allows runtime configuration of randomizer, nap/shutdown modes, and clock stabilizer.

Key Specifications

Pinout & Package

40-pin (6mm × 6mm) plastic QFN package (UJ) with exposed thermal pad (Pin 41 = GND). Pin functions are consistent across output modes except for data pins, which differ between CMOS and LVDS configurations.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9240ASTZ-25, LTC2256CUJ-14#TRPBF offers 88% lower power and native LVDS/DDR CMOS outputs for modern FPGA interfaces; versus LTC2257CUJ-14#TRPBF, it trades 15Msps speed for 28% lower power and tighter thermal envelope in size-constrained modules.

Availability

LTC2256CUJ-14#TRPBF is available at Aetrix Electronics and suitable for portable medical imaging, multi-channel data acquisition, nondestructive testing, and software-defined radio front-ends requiring stable component supply across extended production lifecycles.

Supply support for LTC2256CUJ-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 acquired Linear Technology in 2017 and maintains its high-performance signal chain portfolio, emphasizing precision, speed, and power efficiency in data converters and analog ICs.

The LTC2256CUJ-14#TRPBF belongs to the LTC225x family of ultralow-power, high-SFDR ADCs designed specifically for communications infrastructure, portable instrumentation, and RF-sampling applications where dynamic range and power coexist under tight constraints.

FAQ

What is the maximum sampling rate supported by the LTC2256CUJ-14#TRPBF?

The LTC2256CUJ-14#TRPBF is rated for a maximum sampling rate of 25Msps, as specified in its part number suffix "-14" and confirmed in the Absolute Maximum Ratings and Dynamic Accuracy tables. This rate is fixed for the LTC2256-14 variant and cannot be increased beyond 25Msps even with reduced input frequency or simplified output configuration. The LTC2256CUJ-14#TRPBF achieves 73dB SNR and 88dB SFDR at this rate with a 70MHz input tone.

Does the LTC2256CUJ-14#TRPBF support LVDS output mode?

Yes, the LTC2256CUJ-14#TRPBF supports DDR LVDS output mode with 100Ω on-chip termination, differential output voltage of 247–454mV, and common-mode voltage of 1.125–1.375V. LVDS mode is selected via the SCK pin in parallel programming mode (PAR/SER = VDD) and requires OVDD = 1.7–1.9V. This mode reduces EMI and supports longer trace routing compared to CMOS outputs.

What is the function of the SENSE pin on the LTC2256CUJ-14#TRPBF?

The SENSE pin (Pin 39) on the LTC2256CUJ-14#TRPBF configures the ADC's input voltage range and reference source. Tying SENSE to VDD selects the internal 1.25V reference and ±1V input range; grounding it selects ±0.5V range; applying 0.625V–1.3V externally sets a proportional ±0.8× range. This eliminates external gain stages and enables seamless adaptation to diverse sensor output levels.

Can the LTC2256CUJ-14#TRPBF operate with a single-ended clock input?

Yes, the LTC2256CUJ-14#TRPBF supports single-ended clock operation by tying ENC– (Pin 12) to GND and driving ENC+ (Pin 11) with a 1.8V square wave. In this mode, conversion triggers on the rising edge of ENC+, and the clock duty cycle stabilizer remains functional when enabled via CS. Single-ended drive simplifies clock tree design but may slightly increase jitter versus differential operation.

What power-saving modes does the LTC2256CUJ-14#TRPBF provide?

The LTC2256CUJ-14#TRPBF offers two low-power states: Nap Mode (9mW) and Sleep Mode (0.5mW), both accessible via SPI register writes or parallel control (SDI = high for sleep). Nap Mode retains configuration and reference bias while disabling the ADC core; Sleep Mode powers down all circuitry except wake-up logic. Both modes support fast recovery (<1µs) for burst-mode acquisition.