Analog Devices Inc. LTC2141CUP-12#PBF

Overview

LTC2141CUP-12#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 40Msps dual-channel simultaneous-sampling analog-to-digital converter optimized for high-dynamic-range signal digitization in communications infrastructure. It delivers 70.5dB SNR, 89dB SFDR, and ultralow 0.10psRMS jitter at 70MHz input, operating from a single 1.8V supply with CMOS/DDR CMOS/DDR LVDS output options. It serves as the front-end ADC in cellular base stations and software-defined radios.

For engineers reviewing the LTC2141CUP-12#PBF datasheet, LTC2141CUP-12#PBF pinout, LTC2141CUP-12#PBF application, or LTC2141CUP-12#PBF equivalent, key selection criteria include its 40Msps sampling rate, dual-channel simultaneity, 750MHz full-power bandwidth, 1–2VP-P selectable input range, and support for differential or single-ended clocking with duty cycle stabilization.

Technical Context

The LTC2141CUP-12#PBF implements two independent 12-bit SAR-based ADC cores with shared reference and clock circuitry, enabling true simultaneous sampling critical for I/Q demodulation and phase-coherent multi-channel systems. Its sample-and-hold features 750MHz full-power bandwidth and 0.10psRMS jitter in differential encode mode.

Digital interface flexibility includes full-rate CMOS, DDR CMOS, or DDR LVDS outputs with separate OVDD supply (1.2–1.8V for CMOS, 1.7–1.9V for LVDS), programmable via SPI or parallel control, and configurable features including data randomizer, clock duty cycle stabilizer, nap/sleep modes, and selectable input common-mode voltage via VCM1/VCM2 pins.

Key Specifications

Pinout & Package

64-pin (9mm × 9mm) plastic QFN package with exposed thermal pad (Pin 65 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel 12-bit ADC applications.

Compared with AD9233BCPZ-40, LTC2141CUP-12#PBF provides guaranteed inter-channel simultaneity without external alignment; compared with LTC2140CUP-12#PBF, it delivers 60% higher throughput for wider instantaneous bandwidths while maintaining identical footprint and software compatibility.

Availability

LTC2141CUP-12#PBF is available at Aetrix Electronics and suitable for cellular base stations, software-defined radios, and portable medical imaging systems requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for LTC2141CUP-12#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 DSP technologies, serving aerospace, industrial, automotive, and communications markets.

The LTC2141CUP-12#PBF belongs to the LTC214x family of ultra-low-jitter, dual-channel ADCs designed specifically for demanding communications and instrumentation applications requiring simultaneous sampling, wide input bandwidth, and flexible digital interfacing.

FAQ

What is the maximum sampling rate supported by the LTC2141CUP-12#PBF?

The LTC2141CUP-12#PBF supports a maximum sampling rate of 40Msps. This is confirmed in the device's ordering information and dynamic accuracy specifications, where all AC performance metrics (SNR, SFDR) are characterized at 40Msps for the LTC2141 variant. It is part of a family that includes 65Msps (LTC2142) and 25Msps (LTC2140) variants, but LTC2141CUP-12#PBF is specifically rated for 40Msps operation.

Does the LTC2141CUP-12#PBF support differential analog inputs?

Yes, the LTC2141CUP-12#PBF supports fully differential analog inputs on both channels: AIN1+ and AIN1– for Channel 1, and AIN2+ and AIN2– for Channel 2. The datasheet specifies differential input range of 1VP-P to 2VP-P and common-mode voltage of 0.7V to 1.25V, with dedicated VCM1 and VCM2 pins to bias each channel's input stage. Single-ended drive is not recommended due to degraded CMRR and dynamic performance.

What digital output interfaces does the LTC2141CUP-12#PBF support?

The LTC2141CUP-12#PBF supports three digital output interface modes: full-rate CMOS, double-data-rate (DDR) CMOS, and DDR LVDS. Output mode is selected via the PAR/SER pin and SCK control in parallel programming mode. CMOS outputs operate with OVDD from 1.2V to 1.8V; LVDS outputs require OVDD = 1.8V and provide differential signaling with on-chip 100Ω termination. All modes deliver 12-bit parallel data per channel.

What is the purpose of the PAR/SER pin on the LTC2141CUP-12#PBF?

The PAR/SER pin on the LTC2141CUP-12#PBF selects between serial SPI programming (PAR/SER = GND) and parallel logic programming (PAR/SER = VDD). In serial mode, CS/SCK/SDI/SDO form a 4-wire SPI interface for full register access. In parallel mode, those pins become discrete control inputs (e.g., CS enables duty cycle stabilizer, SCK selects output format), offering faster configuration with fewer external components but reduced functional granularity compared to SPI.

How does the LTC2141CUP-12#PBF manage power consumption in low-duty-cycle systems?

The LTC2141CUP-12#PBF offers two low-power states: Nap mode (10mW) and Sleep mode (1mW), both accessible via SPI or parallel control. These modes disable the ADC core and output drivers while retaining register settings and reference bias. They are ideal for burst-mode operation in portable medical imaging or intermittent spectrum monitoring, where rapid wake-up (<1μs) and minimal quiescent draw are essential - directly supporting energy-efficient system architectures using LTC2141CUP-12#PBF.