Analog Devices Inc. LTC2152IUJ-14#PBF

Overview

LTC2152IUJ-14#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, 250Msps high-speed analog-to-digital converter optimized for undersampling wideband RF signals in communications infrastructure. It delivers 70dB SNR, 90dB SFDR, and 1.25GHz full-power bandwidth with DDR LVDS outputs, operating from a single 1.8V supply. It is deployed in cellular basestations and software-defined radios requiring high dynamic range digitization of IF/RF signals.

For engineers reviewing the LTC2152IUJ-14#PBF datasheet, LTC2152IUJ-14#PBF pinout, LTC2152IUJ-14#PBF application, or LTC2152IUJ-14#PBF equivalent, key selection criteria include its 250Msps sampling rate, 1.5VP-P differential input range, integrated clock duty cycle stabilizer, low-power sleep/napping modes, and compatibility with 6mm × 6mm QFN PCB layouts.

Technical Context

The LTC2152IUJ-14#PBF implements a 14-bit pipelined ADC architecture with on-chip sample-and-hold, correction logic, and DDR LVDS output drivers. Its 1.25GHz analog input bandwidth enables direct RF sampling up to Nyquist-limited frequencies without external front-end downconversion.

Digital interface control is handled via a serial SPI port supporting configuration of LVDS current mode (1.75mA/3.5mA), clock duty cycle stabilization, nap/sleep modes, and output data format. The ENC+/ENC– differential encode inputs accept sine wave, PECL, LVDS, TTL, or CMOS clocks, with optional internal duty cycle correction for jitter-sensitive applications.

Key Specifications

Pinout & Package

40-lead (6mm × 6mm) plastic QFN package with exposed thermal pad (Pin 41 = 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 AD9680BCPZ-500 and LTC2262IUP-14#PBF, the LTC2152IUJ-14#PBF uniquely balances 250Msps speed, DDR LVDS simplicity, industrial temperature rating (–40°C to +85°C), and sub-360mW power - making it optimal for space-constrained, high-SFDR RF receivers without JESD204B infrastructure.

Availability

LTC2152IUJ-14#PBF is available at Aetrix Electronics and suitable for cellular basestation receivers, software defined radios, medical ultrasound beamformers, and high-speed test & measurement instruments requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2152IUJ-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 RF ICs for precision and high-speed applications.

The LTC2152IUJ-14#PBF belongs to the Linear Technology LTC215x family of ultra-high-speed, low-power pipeline ADCs designed specifically for communications infrastructure, defense EW systems, and medical imaging where dynamic range and RF sampling fidelity are critical.

FAQ

What is the guaranteed operating temperature range for the LTC2152IUJ-14#PBF?

The LTC2152IUJ-14#PBF is rated for industrial temperature operation from –40°C to +85°C, as confirmed by its "I" grade designation and Absolute Maximum Ratings table. This ensures reliable performance in outdoor basestation enclosures and ruggedized test equipment without derating.

Does the LTC2152IUJ-14#PBF require an external reference voltage?

No - the LTC2152IUJ-14#PBF includes an internal 1.25V reference with ±30ppm/°C drift and supports external reference via the SENSE pin. When SENSE is tied to VDD, the internal reference is selected and the analog input range defaults to ±0.75V differential (1.5VP-P), eliminating need for external reference components in most deployments.

How many data bits does each DDR LVDS pair carry on the LTC2152IUJ-14#PBF?

Each DDR LVDS pair (e.g., D0_1+, D0_1–) carries two data bits - one even bit (e.g., D0) appearing when CLKOUT+ is low, and one odd bit (e.g., D1) appearing when CLKOUT+ is high. All seven pairs collectively transmit the full 14-bit parallel word across a single clock cycle.

Can the LTC2152IUJ-14#PBF operate with a non-50% duty cycle clock?

Yes - the LTC2152IUJ-14#PBF includes an optional clock duty cycle stabilizer that can be enabled via SPI register to correct duty cycle deviations, ensuring sub-0.15psRMS aperture jitter even with clocks ranging from 30% to 70% duty cycle - critical for maintaining SFDR at 250Msps.

What is the function of the OF+, OF– pins on the LTC2152IUJ-14#PBF?

The OF+, OF– pins on the LTC2152IUJ-14#PBF provide a differential overflow/underflow flag indicating when the analog input exceeds the ±0.75V full-scale range. The flag is valid only during the low phase of CLKOUT+, enabling synchronous latching in FPGA logic without metastability risk.