Analog Devices Inc. LTC1403CMSE-1#TRPBF

Overview

LTC1403CMSE-1#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 2.8 Msps serial analog-to-digital converter with differential inputs, 3V single-supply operation, ±1.25V bipolar input range, and integrated 2.5V bandgap reference. It delivers 70.5 dB SINAD at 100 kHz and supports high-speed portable data acquisition in space-constrained systems.

For engineers reviewing the LTC1403CMSE-1#TRPBF datasheet, LTC1403CMSE-1#TRPBF pinout, LTC1403CMSE-1#TRPBF application, or LTC1403CMSE-1#TRPBF equivalent, key selection criteria include its 39 ns acquisition time, 80 dB common-mode rejection at 1 MHz, Sleep mode power of 10 µW, and compatibility with standard 3-wire SPI-like serial interfaces operating up to 50.4 MHz.

Technical Context

The LTC1403CMSE-1#TRPBF implements a fully differential sample-and-hold front-end followed by a 12-bit successive-approximation ADC core. Its timing logic synchronizes conversion start (CONV↑) with a 16-cycle serial output window aligned to SCK rising edges, enabling deterministic 2.8 Msps throughput when acquisition time is allocated between conversions.

It features an internal 2.5V reference with ±15 ppm/°C tempco and supports external overdrive (2.55V–VDD). The device operates across 0°C to 70°C, draws 4.7 mA active current from 3V, and achieves 75 dB SNR and –87 dB THD at 100 kHz with differential input signals.

Key Specifications

Pinout & Package

Package: 10-lead plastic MSOP (MSE), exposed pad (Pin 11) must be soldered to PCB ground plane for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8326IDRCT and MAX1166CCM+T, the LTC1403CMSE-1#TRPBF uniquely combines 2.8 Msps throughput, 10 µW Sleep mode, and ±1.25 V differential input range in a 10-lead MSOP - making it optimal for portable, battery-sensitive, high-dynamic-range sampling where size and quiescent power are critical.

Availability

LTC1403CMSE-1#TRPBF is available at Aetrix Electronics and suitable for communications baseband sampling, portable data acquisition systems, and uninterruptible power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant tape-and-reel packaging.

Supply support for LTC1403CMSE-1#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.

The LTC1403CMSE-1#TRPBF belongs to Linear's legacy high-speed SAR ADC family, designed specifically for portable instrumentation, motor control, and telecom infrastructure where low power, small size, and differential input robustness are essential.

FAQ

What is the guaranteed operating temperature range for the LTC1403CMSE-1#TRPBF?

The LTC1403CMSE-1#TRPBF is specified for 0°C to 70°C ambient operation (Commercial grade). This is confirmed in the Absolute Maximum Ratings table and Order Information section of the datasheet, where "C" in the part number denotes the commercial temperature range. Industrial-grade variants (e.g., LTC1403IMSE-1#TRPBF) extend to –40°C to 85°C.

Does the LTC1403CMSE-1#TRPBF support external reference voltages, and what is the valid range?

Yes, the LTC1403CMSE-1#TRPBF supports external reference overdrive on the VREF pin. The valid range is 2.55 V to VDD (3.6 V max), as stated in the Internal Reference Characteristics table. External references above 2.55 V override the internal 2.5 V bandgap, scaling the ±1.25 V input range proportionally - e.g., a 3.3 V reference yields ±1.65 V full-scale.

How does the Sleep mode of the LTC1403CMSE-1#TRPBF activate, and what is its power consumption?

Sleep mode activates after four or more CONV pulses while SCK is held static (high or low), reducing supply current to 2 µA typical (10 µW at 3 V). This is documented in the Power Requirements table and Applications Information section. Wake-up occurs on the first SCK edge, with VREF settling in 2 ms before valid conversions resume.

What is the meaning of "LTC1403-1" versus "LTC1403A-1" in the datasheet, and which applies to LTC1403CMSE-1#TRPBF?

The "-1" suffix denotes the 12-bit version (LTC1403-1); "A-1" denotes the 14-bit variant (LTC1403A-1). The LTC1403CMSE-1#TRPBF is the 12-bit version, confirmed by its resolution specification (12 bits, no missing codes), 12-bit timing diagrams, and 12-bit output word labeling (D11–D0) in the Timing Diagram section.

Can the LTC1403CMSE-1#TRPBF interface directly with a standard SPI master without level-shifting?

Yes - the LTC1403CMSE-1#TRPBF accepts TTL- and 3V CMOS-compatible logic levels: VIH = 2.4 V min and VIL = 0.6 V max at VDD = 3 V. Its SDO output drives VOH ≥ 2.5 V and VOL ≤ 0.1 V under load, matching standard 3.3 V SPI logic thresholds. No level-shifting is required when interfacing with 3.3 V microcontrollers.