Analog Devices Inc. LTC2259CUJ-14#PBF

Overview

LTC2259CUJ-14#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, 80Msps low-power analog-to-digital converter optimized for high-dynamic-range signal digitization in communications and instrumentation. It delivers 73.1dB SNR, 85dB SFDR, ultralow 0.17psRMS jitter, single 1.8V supply operation, and supports CMOS, DDR CMOS, or DDR LVDS digital outputs - enabling direct interface with FPGAs in portable medical imaging and multi-channel data acquisition systems.

For engineers reviewing the LTC2259CUJ-14#PBF datasheet, LTC2259CUJ-14#PBF pinout, LTC2259CUJ-14#PBF application, or LTC2259CUJ-14#PBF equivalent, key selection criteria include its 800MHz full-power bandwidth, ±1LSB INL (typ), 1.2LSBRMS transition noise, 89mW total power dissipation at 80Msps, and compatibility with differential or single-ended clock inputs up to 1.8V.

Technical Context

The LTC2259CUJ-14#PBF employs a pipelined ADC architecture with integrated sample-and-hold, correction logic, and configurable output drivers. Its ENC+/ENC– differential clock interface accepts sine wave, PECL, LVDS, TTL, or CMOS inputs, and includes an optional duty cycle stabilizer for robust timing across wide input duty cycles.

Digital output configuration is managed via PAR/SER pin selection between serial SPI control (CS/SCK/SDI/SDO) and parallel mode (CS/SCK/SDI as functional control lines). Output voltage swing is independently set by OVDD (1.2V–1.9V for CMOS; 1.7V–1.9V for LVDS), and internal reference yields 1.25V VREF with ±25ppm/°C drift.

Key Specifications

Pinout & Package

40-lead (6mm × 6mm) plastic QFN package (UJ) with exposed pad (Pin 41) soldered to PCB ground for thermal and electrical performance. Pin functions are consistent across output modes except for data pins, which differ per CMOS/LVDS configuration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9246BCPZ-80 and LTC2260CUJ-14#PBF, the LTC2259CUJ-14#PBF offers lowest power (89mW vs 112mW/150mW), single 1.8V supply, and flexible output mode selection - making it optimal for portable, thermally constrained, or mixed-interface designs where 80Msps suffices.

Availability

LTC2259CUJ-14#PBF is available at Aetrix Electronics and suitable for portable medical imaging, multi-channel data acquisition, nondestructive testing, and software defined radio applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LTC2259CUJ-14#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 digital signal processing technologies.

The LTC2259-14 belongs to Linear's high-speed, low-power ADC product line designed specifically for demanding communications, instrumentation, and medical imaging applications where dynamic range, jitter, and power efficiency are critical.

FAQ

What is the maximum sampling rate supported by the LTC2259CUJ-14#PBF?

The LTC2259CUJ-14#PBF supports a maximum sampling rate of 80Msps. This is confirmed in the Absolute Maximum Ratings and Converter Characteristics tables, where fS (Sampling Frequency) is specified as 1 to 80MHz for the LTC2259-14 variant. Operation beyond 80Msps is not characterized and may degrade SNR, SFDR, or cause functional failure.

Does the LTC2259CUJ-14#PBF support both internal and external voltage references?

Yes, the LTC2259CUJ-14#PBF supports both internal and external references. The SENSE pin (Pin 39) selects the mode: tying SENSE to VDD enables the internal 1.25V reference with ±1V input range; grounding SENSE selects the same internal reference with ±0.5V range; applying 0.625V–1.3V to SENSE enables external reference operation with corresponding input scaling.

What digital output formats does the LTC2259CUJ-14#PBF support?

The LTC2259CUJ-14#PBF supports three digital output formats: full-rate CMOS, double-data-rate (DDR) CMOS, and DDR LVDS. Output mode is selected via the PAR/SER pin and SCK logic level in parallel mode, or configured via SPI register writes in serial mode. OVDD voltage determines CMOS swing (1.2V–1.9V) or LVDS current (1.7V–1.9V).

What is the purpose of the clock duty cycle stabilizer in the LTC2259CUJ-14#PBF?

The clock duty cycle stabilizer in the LTC2259CUJ-14#PBF compensates for non-50% duty cycle encode clocks, ensuring consistent timing margins and preserving AC performance (SNR/SFDR) at full 80Msps rate. It is enabled by driving CS high in parallel programming mode and is especially valuable when using crystal oscillators or PLLs with asymmetric output.

Is the LTC2259CUJ-14#PBF pin-compatible with other devices in the LTC2261/LTC2260/LTC2259 family?

Yes, the LTC2259CUJ-14#PBF is pin-compatible with the LTC2261-14 and LTC2260-14 in the 40-lead QFN (UJ) package. All share identical pin count, footprint, pin functions, and power/ground arrangements. Differences are limited to maximum sampling rate (80/105/125Msps), power consumption, and minor AC performance specs - enabling hardware reuse across speed grades.