Analog Devices Inc. LTC2140CUP-12#TRPBF

Overview

LTC2140CUP-12#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 25Msps dual-channel simultaneous-sampling analog-to-digital converter optimized for low-power wideband signal digitization in communications and portable instrumentation. It delivers 70.5dB SNR, 89dB SFDR, 750MHz full-power bandwidth, ±0.3LSB INL (typ), and operates from a single 1.8V supply with CMOS/DDR CMOS/DDR LVDS output options. It is used in multi-channel data acquisition systems requiring precise phase-matched sampling.

For engineers reviewing the LTC2140CUP-12#TRPBF datasheet, LTC2140CUP-12#TRPBF pinout, LTC2140CUP-12#TRPBF application, or LTC2140CUP-12#TRPBF equivalent, key selection criteria include its 25Msps sample rate, dual-channel simultaneity, 70.5dB SNR at 70MHz input, 48mW total power consumption, and 64-pin QFN package with differential analog inputs and SPI configuration interface.

Technical Context

The LTC2140CUP-12#TRPBF implements two independent 12-bit ADC cores sharing a common clock domain to ensure precise channel-to-channel timing alignment. Its sample-and-hold circuit achieves 0.08psRMS jitter and 750MHz full-power bandwidth, enabling high-fidelity undersampling of IF signals up to 140MHz. Internal reference generation provides 1.25V ±25ppm/°C VREF and programmable VCM outputs for analog input biasing.

Digital output flexibility includes full-rate CMOS, DDR CMOS, or DDR LVDS modes, with separate OVDD supply (1.1–1.9V) supporting 1.2V/1.5V/1.8V CMOS swings or 1.75mA/3.5mA LVDS current modes. Configuration is managed via a 4-wire SPI port (CS/SCK/SDI/SDO) supporting serial programming mode when PAR/SER is grounded.

Key Specifications

Pinout & Package

64-lead (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 integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS52J90IRGCT and AD9233BCPZ-25, the LTC2140CUP-12#TRPBF uniquely integrates dual simultaneous sampling, internal reference, and sub-50mW power in a single 9mm QFN-making it optimal for space- and energy-constrained portable instrumentation where channel coherence and battery life are critical.

Availability

LTC2140CUP-12#TRPBF is available at Aetrix Electronics and suitable for portable medical imaging, nondestructive testing, multi-channel data acquisition, and software-defined radio applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LTC2140CUP-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 LTC2140 series belongs to ADI's high-speed precision ADC product line, designed specifically for demanding wideband digitization in portable, low-power, and phase-coherent applications such as ultrasound, radar, and communications infrastructure.

FAQ

What is the maximum sampling rate supported by the LTC2140CUP-12#TRPBF?

The LTC2140CUP-12#TRPBF supports a maximum sampling rate of 25Msps per channel. This fixed rate is defined by the LTC2140 variant within the LTC2142/LTC2141/LTC2140 family (65Msps/40Msps/25Msps respectively). The device does not support programmable oversampling or decimation; its timing is governed by the ENC+ clock input with specified minimum/maximum periods per the datasheet timing table.

Does the LTC2140CUP-12#TRPBF include an internal voltage reference?

Yes, the LTC2140CUP-12#TRPBF integrates an internal 1.25V reference (VREF) with ±25ppm/°C temperature drift and 0.6mV/V line regulation. It also provides VCM1 and VCM2 outputs (nominally VDD/2) for analog input biasing. External reference mode is supported via the SENSE pin, accepting 0.625V–1.3V inputs for improved accuracy or custom scaling.

Can the LTC2140CUP-12#TRPBF operate with single-ended analog inputs?

No-the LTC2140CUP-12#TRPBF is designed exclusively for differential analog inputs (AIN1+/AIN1– and AIN2+/AIN2–). Single-ended drive is not supported; attempting to apply a single-ended signal violates the common-mode input range specification (0.7–1.25V) and degrades CMRR, INL, and SNR. Proper operation requires balanced differential signaling with appropriate termination and common-mode biasing via VCM1/VCM2.

What digital output interface options does the LTC2140CUP-12#TRPBF support?

The LTC2140CUP-12#TRPBF supports three digital output modes: full-rate CMOS, double-data-rate (DDR) CMOS, and DDR LVDS. Output mode is selected via the PAR/SER pin and SPI-controlled registers. CMOS modes use OVDD (1.1–1.9V) to set swing; LVDS mode uses internal 100Ω termination and supports 1.75mA or 3.5mA current modes for flexible noise/power trade-offs.

How is configuration performed on the LTC2140CUP-12#TRPBF?

Configuration is performed via a 4-wire SPI interface (CS, SCK, SDI, SDO) when PAR/SER is grounded (serial programming mode). This allows full access to all operating registers-including output mode, randomizer enable, duty cycle stabilizer, shutdown control, and input range selection. In parallel mode (PAR/SER = VDD), only basic functions like duty cycle stabilizer and output mode are controlled via logic levels on CS/SCK/SDI.