Analog Devices Inc. LTC1403IMSE-1#PBF

Overview

LTC1403IMSE-1#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, ±1.25V bipolar input range, and integrated 2.5V bandgap reference. It delivers 73.5 dB SINAD at 100 kHz and supports high-speed portable data acquisition in motor control and communications systems.

For engineers reviewing the LTC1403IMSE-1#PBF datasheet, LTC1403IMSE-1#PBF pinout, LTC1403IMSE-1#PBF application, or LTC1403IMSE-1#PBF equivalent, key selection criteria include sampling rate vs. power trade-offs (2.8 Msps / 4.7 mA active), differential CMRR (80 dB), shutdown modes (3 mW Nap / 10 µW Sleep), and MSOP-10 package compatibility with space-constrained PCB layouts.

Technical Context

The LTC1403IMSE-1#PBF implements a fully differential sample-and-hold front-end with aperture jitter of 0.3 ps and acquisition time of 39 ns, enabling accurate digitization of fast-changing signals. Its internal timing logic synchronizes conversion start (CONV↑) with 16-cycle serial output transmission on SDO, compatible with standard 3-wire SPI interfaces.

It uses a 14-bit successive-approximation ADC core referenced to an on-chip 2.5V bandgap source (±15 ppm/°C tempco), supporting both internal reference operation and external overdrive (2.55V–VDD). Common-mode rejection remains at 80 dB up to 1 MHz, allowing robust noise rejection in ground-loop-prone industrial environments.

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, low-power ADC applications.

Compared with ADS8326IPW and MAX1190ETE+, the LTC1403IMSE-1#PBF uniquely balances 14-bit resolution, 2.8 Msps speed, and ultra-low Nap/Sleep power in a single-supply MSOP package-making it optimal for portable, event-triggered, or thermally constrained acquisition systems where reference integration and CMRR matter.

Availability

LTC1403IMSE-1#PBF is available at Aetrix Electronics and suitable for motor control feedback loops, portable communications receivers, uninterruptible power supply monitoring, and multiplexed industrial data acquisition requiring stable component supply and long-term manufacturability.

Supply support for LTC1403IMSE-1#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 acquired Linear Technology in 2017 and maintains its precision analog product lines, including high-performance data converters, with global manufacturing and quality certification to ISO 9001 and IATF 16949.

The LTC1403IMSE-1#PBF belongs to Linear's legacy high-speed, low-power SAR ADC family designed for portable instrumentation, industrial automation, and communications infrastructure where speed, accuracy, and power efficiency coexist under single 3V supply constraints.

FAQ

What is the operating temperature range for the LTC1403IMSE-1#PBF?

The LTC1403IMSE-1#PBF is rated for operation from –40°C to +85°C, making it suitable for industrial and automotive-adjacent environments. This extended temperature grade distinguishes it from the commercial-grade LTC1403CMSE-1#PBF (0°C to 70°C) and confirms its qualification for demanding embedded applications where thermal stability is critical. The device maintains full specification compliance-including 2.8 Msps sampling and 73.5 dB SINAD-across this full range.

Does the LTC1403IMSE-1#PBF require an external reference voltage?

No, the LTC1403IMSE-1#PBF includes a factory-trimmed 2.5V internal bandgap reference (±15 ppm/°C tempco) that supports its ±1.25V differential input range. A 10µF ceramic capacitor is required on the VREF pin for stability and noise reduction. However, the VREF pin can be overdriven with an external reference between 2.55V and VDD if tighter voltage tolerance or custom input scaling is needed-enabling flexible system-level calibration without adding external reference ICs.

How does the LTC1403IMSE-1#PBF enter Nap and Sleep modes?

The LTC1403IMSE-1#PBF enters Nap mode with two CONV pulses while SCK is held static (high or low), reducing supply current to 1.1 mA (3 mW). Sleep mode activates after four or more CONV pulses under the same SCK condition, dropping current to just 2 µA (10 µW). Both modes retain register state and wake instantly (<2 ms VREF settling) upon next CONV pulse-ideal for duty-cycled sensing where microsecond responsiveness and nanowatt quiescent power are jointly required.

What is the significance of the exposed pad (Pin 11) on the LTC1403IMSE-1#PBF?

The exposed pad (Pin 11) on the LTC1403IMSE-1#PBF is a thermal and electrical ground connection that must be soldered directly to a solid PCB ground plane. It lowers thermal resistance (θJA = 40°C/W) and reduces noise coupling by providing a low-inductance return path for analog and digital currents. Leaving it unconnected degrades CMRR, increases thermal stress, and violates Absolute Maximum Ratings-potentially causing parametric drift or premature failure in sustained high-throughput operation.

Can the LTC1403IMSE-1#PBF interface directly with an FPGA using standard SPI protocol?

Yes, the LTC1403IMSE-1#PBF uses a 3-wire serial interface (SCK, CONV, SDO) compatible with standard SPI timing conventions. It outputs 14-bit 2's complement data on SDO synchronized to SCK rising edges, with no CS/SS pin required-CONV serves as frame synchronization. The 16-clock data window and fixed setup/hold times (e.g., t2 = 3 ns, t8 = 8 ns) ensure reliable FPGA capture using simple shift-register logic, eliminating need for custom interface IP or level translators when VDD = 3V.