Analog Devices Inc. LTC2422IMS#TRPBF

Overview

LTC2422IMS#TRPBF from Analog Devices (formerly Linear Technology) is a 2-channel, 20-bit micropower delta-sigma ADC in MSOP-10 package, operating from 2.7V to 5.5V supply. It delivers 8ppm INL, 1.2ppm RMS noise, and no-latency digital filtering with single-cycle settling-enabling high-precision bridge digitization in weight scales and strain gauge transducers.

For engineers reviewing the LTC2422IMS#TRPBF datasheet, LTC2422IMS#TRPBF pinout, LTC2422IMS#TRPBF application, or LTC2422IMS#TRPBF equivalent, key selection criteria include its pseudo-differential 2-channel architecture, internal 50/60Hz notch filter via FO pin, extended input range (–12.5% to +112.5% VREF), 200µA active current, and SPI/MICROWIRE-compatible 3-wire interface.

Technical Context

The LTC2422IMS#TRPBF employs a proprietary delta-sigma modulator with a decimating FIR filter that settles fully in one conversion cycle-eliminating latency typical of conventional ∆Σ converters. Its auto-calibrating architecture performs zero-scale and full-scale correction every cycle, ensuring stability over temperature and supply voltage drift.

Conversion clocking is flexible: internal oscillator enables 50Hz or 60Hz ±2% rejection (via FO = VCC or GND), or external clock (2.56–307.2 kHz) sets user-defined notch frequency at f_EOSC/2560. Input range extends from ZSSET – 0.12·V_REF to FSSET + 0.12·V_REF, where V_REF = FSSET – ZSSET, supporting live-zero sensor interfaces.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 20-bit precision ADC applications.

Compared with LTC2402CMS8#PBF and ADS124S08IPWR, the LTC2422IMS#TRPBF uniquely combines 20-bit precision, 200µA operation, no-latency filtering, and –12.5% to +112.5% VREF input range in a compact MSOP-10 - making it optimal for space-constrained, low-power bridge and sensor front-ends where deterministic timing and live-zero calibration are critical.

Availability

LTC2422IMS#TRPBF is available at Aetrix Electronics and suitable for weight scales, industrial process control, and direct temperature measurement requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for LTC2422IMS#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 acquired Linear Technology in 2017 and maintains its high-precision signal chain portfolio with rigorous automotive and industrial qualification standards.

The LTC2422IMS#TRPBF belongs to Linear's µPower No-Latency Delta-Sigma ADC family, designed specifically for high-accuracy, low-power sensor digitization in instrumentation, industrial automation, and portable test equipment.

FAQ

What is the function of the FO pin on the LTC2422IMS#TRPBF?

The FO pin on the LTC2422IMS#TRPBF selects the notch frequency of the internal digital filter: tied to VCC enables >110dB rejection at 50Hz ±2%, tied to GND enables >110dB rejection at 60Hz ±2%, and driven by an external clock (2.56–307.2 kHz) sets rejection at f_EOSC/2560. This eliminates need for external line-frequency filters and supports global deployment.

Does the LTC2422IMS#TRPBF support true differential input measurements?

The LTC2422IMS#TRPBF supports pseudo-differential inputs-not true differential-where each channel (CH0/CH1) measures relative to system ground, with zero-scale and full-scale set independently via ZSSET and FSSET pins. This architecture enables ratiometric bridge sensing and live-zero calibration but does not reject common-mode noise like a fully differential input stage.

How does the LTC2422IMS#TRPBF achieve "no latency" in its delta-sigma architecture?

The LTC2422IMS#TRPBF achieves no latency through a novel decimating FIR filter that settles completely within one conversion cycle (130–163 ms depending on FO setting). Unlike conventional ∆Σ ADCs requiring multiple cycles to settle after input changes, each output word corresponds precisely to the most recent analog sample-enabling deterministic timing for multiplexed or rapidly varying signals.

What is the meaning of the extended input range specification (–12.5% to +112.5% VREF) for the LTC2422IMS#TRPBF?

The extended input range (–12.5% to +112.5% VREF) means the LTC2422IMS#TRPBF can accurately digitize signals beyond the nominal 0V to VREF span-accommodating sensor offset, amplifier gain error, or transient overvoltage. For example, with VREF = 2.5V, valid input is –0.3125V to +2.8125V, enabling robust front-end design without clamping circuits or manual zero adjustment.

Is the LTC2422IMS#TRPBF pin-compatible with earlier Linear ADCs?

Yes, the LTC2422IMS#TRPBF is pin-compatible with the LTC2402 in the MSOP-10 footprint. While the LTC2402 uses MSOP-8, the LTC2422IMS#TRPBF shares identical pin functions for VCC, GND, CS, SDO, SCK, CH0, CH1, FSSET, ZSSET, and FO-allowing direct replacement in designs targeting the LTC2402's functional family, with simplified 24-bit timing versus 32-bit.