Analog Devices Inc. LTC2156CUP-14#PBF

Overview

LTC2156CUP-14#PBF from Analog Devices (formerly Linear Technology) is a dual-channel, simultaneous-sampling 14-bit analog-to-digital converter with 210Msps sampling rate, 70dB SNR, 90dB SFDR, and 1.25GHz full-power bandwidth. It operates from a single 1.8V supply, features DDR LVDS outputs, and targets high-performance communications signal digitization in cellular basestations and software-defined radios.

For engineers reviewing the LTC2156CUP-14#PBF datasheet, LTC2156CUP-14#PBF pinout, LTC2156CUP-14#PBF application, or LTC2156CUP-14#PBF equivalent, key selection criteria include its 210Msps real-time sampling capability, low 616mW total power consumption at full speed, 1.5VP-P easy-to-drive input range, and support for optional clock duty cycle stabilization in demanding RF front-end designs.

Technical Context

The LTC2156CUP-14#PBF implements a pipelined ADC architecture with integrated sample-and-hold (S/H) and digital correction logic, enabling six-cycle pipeline latency and undersampling of IF signals up to 1.25GHz. Its dual-channel design supports true simultaneous sampling with <–95dB crosstalk between channels.

It uses differential DDR LVDS output drivers with programmable 1.75mA/3.5mA current modes and on-chip 100Ω termination. The SPI interface allows configuration of sleep/nap modes, clock duty cycle stabilizer, and output data format, while PAR/SER pin selects serial or parallel programming mode.

Key Specifications

Pinout & Package

64-pin (9mm × 9mm) plastic QFN package with exposed thermal pad (Pin 65 = GND), requiring soldering to PCB ground for thermal and electrical integrity. Dual supply domains: VDD (analog) and OVDD (output drivers), each with dedicated ground pins (GND/OGND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9680BCPZ-500 and LTC2268IUP-14#PBF, the LTC2156CUP-14#PBF uniquely balances 210Msps speed, 616mW efficiency, and single 1.8V operation-making it optimal for thermally constrained, mid-bandwidth SDR and basestation designs requiring proven reliability and minimal supply complexity.

Availability

LTC2156CUP-14#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, software-defined radio development, and medical ultrasound systems requiring stable component supply across multi-year production cycles.

Supply support for LTC2156CUP-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, serving precision instrumentation, communications, and industrial markets.

The LTC2156CUP-14#PBF belongs to Linear's high-speed ADC product line, engineered specifically for demanding RF receiver applications requiring simultaneous sampling, wide input bandwidth, and low power per Msps in compact form factors.

FAQ

What is the maximum sampling rate supported by the LTC2156CUP-14#PBF?

The LTC2156CUP-14#PBF supports a maximum sampling rate of 210Msps, validated across the full 0°C to 70°C operating temperature range. This rate enables digitization of signals up to 105MHz (Nyquist) and supports undersampling of higher-frequency IF signals up to 1.25GHz due to its full-power bandwidth specification.

Does the LTC2156CUP-14#PBF require external voltage references?

No-the LTC2156CUP-14#PBF integrates an internal 1.25V reference with ±30ppm/°C drift and provides VREF and SENSE pins for flexible configuration. An external 1.2V–1.3V reference applied to SENSE selects a scaled input range, but the internal reference is fully functional without external components.

How does the DDR LVDS interface of the LTC2156CUP-14#PBF reduce FPGA pin count?

The LTC2156CUP-14#PBF uses double-data-rate LVDS outputs: each differential pair carries two time-multiplexed bits (e.g., DA0 and DA1), halving the number of required FPGA I/O pins versus single-data-rate interfaces-reducing routing complexity and enabling use with mid-tier FPGAs in space-constrained designs.

Can the LTC2156CUP-14#PBF operate with asymmetric clock duty cycles?

Yes-the LTC2156CUP-14#PBF includes an optional clock duty cycle stabilizer (enabled via SPI or parallel mode) that corrects encode clock asymmetry, maintaining >70dB SNR even with input duty cycles ranging from 40% to 60%, which is essential when using PLL-based clock sources.

What is the power consumption of the LTC2156CUP-14#PBF in Nap mode?

In Nap mode, the LTC2156CUP-14#PBF consumes 198mW at its maximum 210Msps sampling rate-reducing total power by approximately 68% compared to active operation (616mW), while retaining sub-microsecond wake-up time for burst-mode signal acquisition.