Analog Devices Inc. LTC2402IMS#TRPBF

Overview

LTC2402IMS#TRPBF from Analog Devices (formerly Linear Technology) is a 2-channel, 24-bit micropower delta-sigma ADC in MSOP-10 package, featuring no-latency digital filtering, 4ppm INL, 0.6ppm RMS noise, and integrated oscillator for 50Hz/60Hz notch rejection - used in precision weight scales and strain gauge transducer interfaces.

For engineers reviewing the LTC2402IMS#TRPBF datasheet, LTC2402IMS#TRPBF pinout, LTC2402IMS#TRPBF application, or LTC2402IMS#TRPBF equivalent, key selection criteria include extended input range (–12.5% to +112.5% VREF), automatic channel ping-pong switching, zero/full-scale set inputs, 2.7V–5.5V single-supply operation, and SPI/MICROWIRE-compatible 3-wire interface.

Technical Context

The LTC2402IMS#TRPBF implements a proprietary decimating FIR filter with single-cycle settling, eliminating latency typical of conventional ∆Σ converters. Its internal oscillator enables fixed 50Hz or 60Hz ±2% notch rejection without external components, while the FO pin selects rejection frequency or accepts external clock (1Hz–120Hz).

It supports pseudo-differential bridge digitization via CH0/CH1 inputs with independent ZSSET and FSSET pins, enabling live-zero calibration and seamless offset/overrange handling. The device performs full auto-calibration (offset and full-scale) every conversion cycle, ensuring stability over temperature, supply voltage, and time.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-precision, low-power ADC applications.

Compared with ADS124S08IPW and MAX11206ETN+, the LTC2402IMS#TRPBF uniquely combines dual-channel ping-pong operation, hardware-configurable 50/60Hz rejection, and dedicated ZSSET/FSSET pins - making it optimal for bridge-based transducers where offset drift and mains interference dominate error budgets.

Availability

LTC2402IMS#TRPBF is available at Aetrix Electronics and suitable for weight scales, strain gauge transducers, and industrial process control systems requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for LTC2402IMS#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.

The LTC2402IMS#TRPBF belongs to ADI's legacy Linear Technology precision ADC family, designed specifically for ultra-low-noise, micropower, direct-sensor-interface applications where latency, line-frequency rejection, and calibration stability are critical.

FAQ

What is the operating temperature range for the LTC2402IMS#TRPBF?

The LTC2402IMS#TRPBF is specified for operation from –40°C to +85°C (Industrial grade). This range is validated across all key parameters including INL (4ppm), offset drift (0.01ppm/°C), and supply current (200µA typ). The device uses the MSOP-10 package with θJA = 130°C/W and TJMAX = 125°C, allowing reliable use in uncontrolled industrial enclosures without forced air cooling. Full specifications are guaranteed across this range per the datasheet's "G"-denoted conditions.

Does the LTC2402IMS#TRPBF require external passive components for its internal oscillator?

No, the LTC2402IMS#TRPBF does not require any external passive components for its internal oscillator. The oscillator is fully integrated and self-contained; connecting FO to VCC or GND configures 50Hz or 60Hz notch rejection respectively, with no crystals, capacitors, or resistors needed. This is confirmed in the datasheet's "Internal Oscillator-No External Components Required" feature list and functional block diagram. External clock mode (via FO pin) is optional and only used when user-defined rejection frequencies between 1Hz and 120Hz are required.

How does the LTC2402IMS#TRPBF handle input signals outside the nominal 0V to VREF range?

The LTC2402IMS#TRPBF supports an extended input range of –12.5% VREF to +112.5% VREF (i.e., ZSSET – 0.12VREF to FSSET + 0.12VREF), explicitly designed to accommodate sensor offset, amplifier saturation, and system-level overrange. Inputs within this range are converted linearly; signals beyond are clamped to the nearest endpoint value. This behavior is documented in Figure 2 ("Input Range") and Table 1 ("Status Bits"), where the EXR (extended range) bit indicates clamping. No damage occurs - absolute max ratings allow –0.3V to VCC + 0.3V at VIN.

Can the LTC2402IMS#TRPBF be used with a 3.3V supply and 2.5V reference?

Yes, the LTC2402IMS#TRPBF is fully compatible with 3.3V supply and 2.5V reference. Its supply range is 2.7V–5.5V, and reference input range is 0.1V–VCC - so 2.5V falls well within spec. At 3.3V/2.5V, typical performance includes 4ppm INL, 0.5ppm offset, and 0.6ppm RMS noise. The extended input range becomes –0.3125V to +2.8125V, and the device maintains ≥110dB 50/60Hz rejection. All timing and interface specs (e.g., SCK levels, CS thresholds) are guaranteed across this configuration per the "Digital Inputs and Outputs" table.

What is the function of the ZSSET and FSSET pins on the LTC2402IMS#TRPBF?

The ZSSET (Pin 5) and FSSET (Pin 2) pins define the zero-scale and full-scale reference points for the LTC2402IMS#TRPBF's conversion range. When VIN = ZSSET, the ADC outputs 0x00000; when VIN = FSSET, it outputs full scale (0xFFFFF). Their difference (VREF = FSSET – ZSSET) sets the effective reference voltage. This architecture enables live-zero calibration - for example, connecting ZSSET to a sensor's offset voltage removes baseline drift before digitization. Both pins accept DC voltages from 0V to VCC (ZSSET ≤ FSSET – 0.1V), and their values directly determine input range, noise, and linearity per the "Analog Input and Reference" section.