Analog Devices Inc. LTC2144CUP-12#TRPBF

Overview

LTC2144CUP-12#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 105 Msps dual-channel simultaneous-sampling analog-to-digital converter optimized for high-dynamic-range signal digitization in communications infrastructure. It delivers 70.5 dB SNR, 89 dB SFDR, and ultralow 0.10 psRMS jitter at full speed, operating from a single 1.8 V supply with CMOS, DDR CMOS, or DDR LVDS outputs. It is deployed in cellular base stations and portable medical imaging systems requiring precise IF sampling.

For engineers reviewing the LTC2144CUP-12#TRPBF datasheet, LTC2144CUP-12#TRPBF pinout, LTC2144CUP-12#TRPBF application, or LTC2144CUP-12#TRPBF equivalent, key selection criteria include its 105 Msps dual-channel sampling rate, 750 MHz full-power bandwidth, selectable 1–2 V_P-P input range, integrated clock duty cycle stabilizer, and support for serial SPI configuration - all in a thermally enhanced 64-pin QFN package.

Technical Context

The LTC2144CUP-12#TRPBF implements two independent 12-bit ADC cores with simultaneous sampling and matched gain/offset (±0.2% FS gain matching, ±1.5 mV offset matching), enabling coherent multi-channel acquisition. Its sample-and-hold features 750 MHz full-power bandwidth and 0.10 psRMS jitter in differential encode mode, supporting undersampling of IF signals up to 140 MHz while maintaining 70.5 dB SNR at 70 MHz input.

Digital interface flexibility includes full-rate CMOS, DDR CMOS, or DDR LVDS output modes with separate OVDD supply (1.2–1.8 V for CMOS; 1.7–1.9 V for LVDS), configurable via PAR/SER pin and SPI register control. Internal reference provides 1.25 V ±25 ppm/°C drift, while external reference mode supports SENSE pin voltage from 0.625 V to 1.300 V.

Key Specifications

Pinout & Package

Package: 64-lead (9 mm × 9 mm) plastic QFN with exposed thermal pad (Pin 65 = GND), rated for 0°C to 70°C operation. 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 dual-channel ADC applications.

Compared with AD9233BCPZ-105, the LTC2144CUP-12#TRPBF integrates dual-channel coherence and clock stabilization in one package, reducing BOM count and layout complexity; versus LTC2145CUP-12#TRPBF, it trades 20 Msps speed for 21% lower power and identical functionality at 105 Msps - optimizing thermal and efficiency constraints.

Availability

LTC2144CUP-12#TRPBF is available at Aetrix Electronics and suitable for cellular infrastructure, portable medical imaging, and software-defined radio applications requiring stable component supply, long-term production continuity, and RoHS-compliant packaging.

Supply support for LTC2144CUP-12#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.

The LTC2144CUP-12#TRPBF belongs to ADI's high-speed precision ADC product line, designed specifically for demanding communications and instrumentation applications where dynamic range, channel coherence, and low power are critical.

FAQ

What is the maximum sampling rate supported by the LTC2144CUP-12#TRPBF?

The LTC2144CUP-12#TRPBF supports a maximum sampling rate of 105 Msps across both channels simultaneously. This is specified under recommended operating conditions (VDD = 1.8 V, sine wave input, differential encode mode) and is validated across the full 0°C to 70°C temperature range. Operation above this rate is not guaranteed and may degrade SNR, SFDR, or cause timing violations in the digital interface.

Does the LTC2144CUP-12#TRPBF support external voltage reference operation?

Yes, the LTC2144CUP-12#TRPBF supports external reference mode via the SENSE pin, which accepts an externally applied voltage from 0.625 V to 1.300 V. In this mode, the internal 1.25 V reference is disabled, and the ADC full-scale range scales linearly with the SENSE voltage. Gain error in external reference mode is ±1.5% FS, and temperature drift is ±10 ppm/°C - tighter than the internal reference's ±25 ppm/°C.

How does the clock duty cycle stabilizer function in the LTC2144CUP-12#TRPBF?

The clock duty cycle stabilizer in the LTC2144CUP-12#TRPBF is enabled via the CS pin in parallel programming mode and corrects non-50% duty cycle clock inputs to maintain optimal aperture timing. It reduces timing uncertainty introduced by asymmetric clocks (e.g., from crystal oscillators or PLLs), ensuring stable 105 Msps operation even with duty cycles from 30% to 70%. The stabilizer adds ≤2 ns propagation delay and consumes an additional 20 mW.

What digital output formats are supported by the LTC2144CUP-12#TRPBF?

The LTC2144CUP-12#TRPBF supports three digital output formats: full-rate CMOS, double-data-rate (DDR) CMOS, and DDR LVDS. Format selection is controlled by the PAR/SER pin and SPI registers. CMOS modes support OVDD from 1.2 V to 1.8 V; LVDS mode requires OVDD = 1.8 V and provides 100 Ω on-chip termination. All modes deliver 12-bit parallel data per channel with pipeline latency of 6–6.5 cycles.

Can the LTC2144CUP-12#TRPBF be used in a single-ended analog input configuration?

Yes, the LTC2144CUP-12#TRPBF supports single-ended analog inputs by tying AIN1– and AIN2– to a clean analog ground (not digital ground) and driving AIN1+ and AIN2+ with referenced signals. Input common-mode voltage must be maintained at VCM1/VCM2 (≈0.9 V), and SNR degrades by ~1.5 dB compared to differential mode due to reduced noise rejection. Full-scale range remains adjustable from 1 V_P-P to 2 V_P-P, and DC specs (INL/DNL) remain unchanged.