Analog Devices Inc. LTC2401IMS#PBF

Overview

LTC2401IMS#PBF from Analog Devices (formerly Linear Technology) is a 1-channel, 24-bit micropower delta-sigma ADC in MSOP-10 package, featuring no-latency digital filtering, 4ppm INL, 0.6ppm RMS noise, and single-cycle settling. It operates from 2.7V to 5.5V, supports pseudo-differential bridge digitization, and is used in precision weight scales and direct temperature measurement systems.

For engineers reviewing the LTC2401IMS#PBF datasheet, LTC2401IMS#PBF pinout, LTC2401IMS#PBF application, or LTC2401IMS#PBF equivalent, key selection criteria include 50/60Hz notch rejection configuration via FO pin, extended input range (–12.5% to +112.5% VREF), internal oscillator operation, and SPI/MICROWIRE-compatible 3-wire interface timing.

Technical Context

The LTC2401IMS#PBF implements a proprietary decimating FIR filter with single-conversion settling, eliminating latency typical of conventional ∆Σ ADCs. Its digital filter null is programmable to 50Hz (FO = VCC) or 60Hz (FO = GND) with ≥110dB rejection, or user-defined via external oscillator (1Hz–120Hz).

It performs automatic zero-scale and full-scale calibration on every conversion cycle, ensuring drift-free offset (<0.5ppm) and full-scale (<4ppm) accuracy across temperature and supply voltage. Input range extends from ZSSET – 0.12VREF to FSSET + 0.12VREF (VREF = FSSET – ZSSET), accommodating sensor offset and overrange conditions without external signal conditioning.

Key Specifications

Pinout & Package

Package: 10-lead plastic MSOP (MS10), 3mm × 3mm × 1.1mm body, 0.5mm pitch, exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 24-bit delta-sigma ADC applications.

Compared with ADS124S08IPWR and MAX11206ETL+, the LTC2401IMS#PBF uniquely combines 50/60Hz dual-notch selection, –12.5%/+112.5% extended input range, and per-conversion auto-calibration-enabling direct sensor interfacing with no external support circuitry in wide-supply industrial environments.

Availability

LTC2401IMS#PBF is available at Aetrix Electronics and suitable for weight scales, direct temperature measurement, and gas analyzers requiring stable component supply, long-term calibration stability, and industrial-grade temperature range (–40°C to +85°C).

Supply support for LTC2401IMS#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, serving industrial, automotive, communications, and healthcare markets.

The LTC2401IMS#PBF belongs to ADI's legacy Linear Technology precision ADC product line, designed specifically for low-power, high-accuracy sensor digitization in harsh industrial environments where drift, noise, and mains interference must be eliminated without complex system-level compensation.

FAQ

What is the function of the FO pin on the LTC2401IMS#PBF?

The FO pin on the LTC2401IMS#PBF selects the digital filter's notch frequency: connecting FO to VCC enables 50Hz ±2% rejection, connecting FO to GND enables 60Hz ±2% rejection, and driving FO with an external AC signal sets rejection at f_EOSC/2560. This eliminates need for external clock components and provides flexible mains-noise suppression in global deployments. The LTC2401IMS#PBF uses this pin to configure its internal oscillator without firmware or register writes.

Does the LTC2401IMS#PBF require external calibration components?

No, the LTC2401IMS#PBF performs automatic zero-scale and full-scale calibration on every conversion cycle using on-chip DACs and logic-no external resistors, capacitors, or calibration routines are needed. This ensures offset error remains below 0.5ppm and full-scale error below 4ppm across –40°C to +85°C and 2.7V–5.5V supply, making the LTC2401IMS#PBF ideal for maintenance-free field instrumentation.

What is the maximum allowed input voltage range for the LTC2401IMS#PBF?

The LTC2401IMS#PBF supports an extended analog input range of ZSSET – 0.12VREF to FSSET + 0.12VREF (where VREF = FSSET – ZSSET), which translates to –12.5% to +112.5% of VREF. However, absolute voltage limits are –0.3V to VCC + 0.3V per absolute maximum ratings. Exceeding these violates ESD protection integrity and increases leakage-induced errors. The LTC2401IMS#PBF tolerates this extended range inherently, avoiding external level-shifting circuits.

Can the LTC2401IMS#PBF interface directly with a microcontroller SPI port?

Yes, the LTC2401IMS#PBF supports SPI- and MICROWIRE-compatible 3-wire communication (CS, SDO, SCK) with no mode pins or configuration registers. In internal-clock mode, SCK is an output (19.2kHz); in external-clock mode, SCK is an input (up to 2MHz). Data is 32-bit MSB-first with status bits (EOC, sign, channel, range), and timing complies with standard SPI setup/hold requirements. The LTC2401IMS#PBF requires no initialization sequence-just assert CS low to begin data transfer.

What is the typical power consumption of the LTC2401IMS#PBF during conversion?

The LTC2401IMS#PBF draws 200µA typical supply current during active conversion (CS = LOW), dropping to 20µA in auto-sleep mode (CS = HIGH). Conversion time is 130.86ms (FO = GND) or 157.03ms (FO = VCC), so average current in periodic 1Hz sampling is ~200µA × 0.13s ≈ 26µA. This ultra-low power enables battery operation in portable instrumentation, and the LTC2401IMS#PBF maintains full 24-bit performance across the entire 2.7V–5.5V supply range.