Analog Devices Inc. LTC1403ACMSE#PBF

Overview

LTC1403ACMSE#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, 80 dB common-mode rejection, and Sleep mode consuming only 10 µW. It features an internal 2.5 V bandgap reference, 3-wire serial interface, and is packaged in a 10-lead MSOP for high-speed portable data acquisition systems.

For engineers reviewing the LTC1403ACMSE#PBF datasheet, LTC1403ACMSE#PBF pinout, LTC1403ACMSE#PBF application, or LTC1403ACMSE#PBF equivalent, key selection criteria include guaranteed 14-bit no-missing-codes performance over 0°C to 70°C, 39 ns acquisition time, 73.5 dB SINAD at 100 kHz, and compatibility with standard SPI-like timing using CONV, SCK, and SDO signals.

Technical Context

The LTC1403ACMSE#PBF employs a successive approximation register (SAR) architecture with a fully differential sample-and-hold front-end, enabling true differential input operation from ground to VDD while rejecting common-mode noise up to 100 MHz. Its timing logic synchronizes conversion initiation on the rising edge of CONV and outputs 14-bit data across 16 SCK cycles.

It integrates a factory-trimmed 2.5 V bandgap reference with ±15 ppm/°C tempco and supports external reference overdrive (2.55 V to VDD). Power management includes Nap mode (3 mW) and Sleep mode (10 µW), both entered via specific CONV pulse sequences without requiring external control lines.

Key Specifications

Pinout & Package

Package: 10-lead plastic MSOP (MSE) with exposed pad (Pin 11), rated for 0°C to 70°C operation. Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8326IDRCT and MAX1190ECM+T, the LTC1403ACMSE#PBF delivers superior dynamic performance at full speed (73.5 dB SINAD), lowest active power (4.7 mA), and unique 10 µW Sleep mode - making it optimal for battery-constrained, high-fidelity signal capture where timing-critical wake-up is needed.

Availability

LTC1403ACMSE#PBF is available at Aetrix Electronics and suitable for motor control systems, portable test equipment, uninterruptible power supplies, and multiplexed industrial data acquisition requiring stable component supply across extended production lifecycles.

Supply support for LTC1403ACMSE#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 semiconductors, formed through the acquisition of Linear Technology in 2017.

The LTC1403A series belongs to ADI's precision high-speed data acquisition product line, designed specifically for portable, low-power, and noise-sensitive applications demanding 14-bit resolution at multi-Msps rates without sacrificing DC accuracy.

FAQ

What is the operating temperature range for the LTC1403ACMSE#PBF?

The LTC1403ACMSE#PBF is specified for operation from 0°C to 70°C, as indicated by the "C" grade suffix in its part number. This commercial-grade rating makes it suitable for indoor industrial equipment, consumer test gear, and non-automotive portable electronics where ambient temperatures remain within this range. The device maintains full 14-bit no-missing-codes performance and all dynamic specifications across this interval.

Does the LTC1403ACMSE#PBF require an external reference, or does it have an internal one?

The LTC1403ACMSE#PBF includes a factory-trimmed 2.5 V internal bandgap reference accessible at Pin 3 (VREF), eliminating the need for an external reference in most applications. It can be overdriven by an external reference between 2.55 V and VDD for improved accuracy or different input spans. A minimum 10 µF bypass capacitor is mandatory on VREF for stability and noise performance.

How does the Sleep mode of the LTC1403ACMSE#PBF work, and how is it activated?

Sleep mode (10 µW) on the LTC1403ACMSE#PBF is entered by applying four or more pulses to the CONV pin while SCK is held static (high or low). This low-power state disables the internal reference and analog circuitry. Wake-up occurs on the first SCK edge, with VREF settling in 2 ms. Sleep mode is ideal for duty-cycled sensing applications where the ADC remains idle >90% of the time.

Can the LTC1403ACMSE#PBF interface directly with a standard SPI controller?

The LTC1403ACMSE#PBF uses a 3-wire serial interface (CONV, SCK, SDO) that is SPI-compatible in timing but not protocol-identical: it lacks chip select (CS) and requires external generation of the CONV strobe to initiate each conversion. Data appears on SDO during 16 SCK cycles after CONV↑, with bit order MSB-first. Microcontroller firmware must manage CONV timing separately from SCK.

What is the maximum source impedance supported for direct driving of the LTC1403ACMSE#PBF analog inputs?

The LTC1403ACMSE#PBF analog inputs have 13 pF capacitance and require 39 ns acquisition time for full 2.8 Msps throughput. With a 1 kΩ source impedance, the RC time constant (13 ns) is well within this limit. For reliable operation at full speed, source impedance should not exceed ~1.5 kΩ; higher impedances necessitate an external buffer amplifier with ≥40 MHz bandwidth and low output impedance to meet settling requirements.