LTC2421IMS#PBF

Analog To Digital Converters (ADC) Overview

The LTC2421IMS#PBF is a single-channel, 20-bit micropower analog-to-digital converter (ADC) in a 10-lead MSOP package. It operates on a single supply voltage ranging from 2.7V to 5.5V with a typical supply current of 200µA during conversion and 20µA in shutdown mode. The device utilizes delta-sigma technology with an integrated oscillator and digital filter that settles in a single cycle, eliminating latency. Key electrical specifications include 8ppm integral nonlinearity (INL), 1.2ppm RMS noise, and greater than 110dB rejection at 50Hz or 60Hz. It features an extended input range of –12.5% VREF to 112.5% VREF and communicates via a 2- or 3-wire SPI/MICROWIRE compatible interface.

Analog To Digital Converters (ADC) Feature Summary

• 20-bit resolution with no missing codes and 8ppm INL
• No latency architecture: digital filter settles in a single conversion cycle
• Integrated internal oscillator for 50Hz/60Hz notch filtering without external components
• Extended input range accommodating ±12.5% overrange and underrange

Analog To Digital Converters (ADC) Applications

• Weight scales
• Direct temperature measurement
• Gas analyzers
• Strain gauge transducers
• Industrial process control data acquisition

Analog To Digital Converters (ADC) Procurement Notes

Verify the IMS suffix indicates the industrial temperature range (-40°C to +85°C). Confirm the #PBF suffix denotes lead-free packaging compliant with RoHS standards. Ensure the component source provides valid traceability documentation for Analog Devices Inc. products.

Analog To Digital Converters (ADC) Selection Notes

Select the LTC2421 for single-channel applications; use the LTC2422 for dual-channel requirements. This part is pin-compatible with the LTC2401/LTC2402 series but outputs 24 bits instead of 32. Ensure the reference voltage (FSSET - ZSSET) is within the 0.1V to VCC range to maintain specified performance.

Analog To Digital Converters (ADC) Part Context

This component belongs to the LTC2421/LTC2422 family of micropower ADCs. It serves as a high-precision replacement for legacy converters like the LTC2401, offering drop-in compatibility in terms of pinout and timing while providing improved power efficiency and zero-latency data output characteristics.

Analog To Digital Converters (ADC) Replacement Considerations

The LTC2421IMS is pin-compatible with the LTC2401IMS and LTC2402IMS. When replacing these parts, note that the output word length differs (24 bits vs 32 bits), requiring adjustment in microcontroller data parsing logic if strict timing alignment with the older 32-bit format is not maintained.