Analog Devices Inc. LTC1403AHMSE#PBF

Overview

LTC1403AHMSE#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, 2.8 Msps serial analog-to-digital converter with differential inputs, 3V single-supply operation, –40°C to 125°C extended temperature range, and 80 dB common-mode rejection. It delivers 73.5 dB SINAD at 100 kHz input and supports high-speed portable data acquisition in motor control and communications systems.

For engineers reviewing the LTC1403AHMSE#PBF datasheet, LTC1403AHMSE#PBF pinout, LTC1403AHMSE#PBF application, or LTC1403AHMSE#PBF equivalent, key selection criteria include guaranteed 14-bit no-missing-codes performance over full temperature range, 39 ns sample-and-hold acquisition time, Sleep mode power consumption of 10 µA, and MSOP-10 package compatibility with high-density PCB layouts.

Technical Context

The LTC1403AHMSE#PBF implements a successive approximation register (SAR) architecture with integrated 2.5 V bandgap reference and differential sample-and-hold. Its timing logic synchronizes conversion start (CONV↑) with external SCK, outputting 14-bit data across 16 clock cycles while supporting up to 2.8 Msps throughput with 50.4 MHz clock.

It features dual shutdown modes: Nap mode draws 1.2 mA and Sleep mode draws 10 µA, both activated via CONV pulse sequences. The analog input accepts 0 V to 2.5 V differential swing with 0 V to VDD common-mode range, enabling direct interfacing with single-supply sensor front-ends without level-shifting.

Key Specifications

Pinout & Package

Package: 10-lead plastic MSOP (MSE), exposed pad (Pin 11) tied to GND and soldered to PCB thermal pad for optimal thermal and electrical grounding.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC1403AHMSE#PBF, ADS8860IDRCT trades 1.8 Msps speed and Sleep mode for 2 extra bits and simpler digital interface, while MAX11198ETE+ matches temperature grade and resolution but sacrifices 0.8 Msps throughput and advanced power management.

Availability

LTC1403AHMSE#PBF is available at Aetrix Electronics and suitable for motor control, power supply monitoring, and communications baseband sampling requiring stable component supply across extended temperature ranges.

Supply support for LTC1403AHMSE#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.

The LTC1403A family was designed by Linear Technology (acquired by ADI in 2017) specifically for high-speed, low-power, thermally robust data acquisition in portable and automotive systems demanding 14-bit accuracy at 2.8 Msps.

FAQ

What is the guaranteed operating temperature range for LTC1403AHMSE#PBF?

The LTC1403AHMSE#PBF is specified for continuous operation from –40°C to 125°C, with all key parameters-including 14-bit resolution, ±0.5 LSB integral linearity, and 2.8 Msps sampling rate-guaranteed across this full range. This makes LTC1403AHMSE#PBF suitable for under-hood automotive and industrial control applications where ambient temperatures exceed standard commercial grades.

Does LTC1403AHMSE#PBF require an external reference, or can it operate with its internal reference?

LTC1403AHMSE#PBF includes a factory-trimmed 2.5 V internal bandgap reference that is fully functional and specified for all performance metrics. It can be overdriven by an external reference between 2.55 V and VDD if higher accuracy or different input span is needed. No external reference is required for standard 0 V to 2.5 V differential input operation.

How does the Sleep mode of LTC1403AHMSE#PBF reduce power, and how quickly does it resume conversion?

LTC1403AHMSE#PBF enters Sleep mode after four or more CONV pulses with SCK held static, reducing supply current to 10 µA (10 µW at 3 V). Upon wake-up (first SCK pulse), the internal 2.5 V reference settles in 2 ms, after which full-speed conversion resumes. This enables ultra-low-power duty-cycled sensing without sacrificing responsiveness.

What is the meaning of "differential input range" for LTC1403AHMSE#PBF, and how does it differ from common-mode range?

For LTC1403AHMSE#PBF, the differential input range is 0 V to 2.5 V-the voltage difference between AIN+ and AIN– that maps to full-scale digital output. The common-mode range is 0 V to VDD-the absolute voltage each input may assume independently while maintaining valid operation. Both ranges are simultaneously supported, enabling true differential acquisition without level-shifting circuitry.

Can LTC1403AHMSE#PBF interface directly with a microcontroller's SPI port?

Yes, LTC1403AHMSE#PBF uses a 3-wire serial interface (CONV, SCK, SDO) compatible with standard SPI timing conventions. It outputs 14-bit data on SCK rising edges during 16 clock cycles following CONV↑, with no CS pin required. Microcontroller GPIOs can emulate the protocol, and many ARM Cortex-M devices support it natively via hardware SPI with minor configuration adjustments.