LTC2444IUHF#PBF

Analog To Digital Converters (ADC) Overview

The LTC2444IUHF#PBF is a 24-bit, high-speed, 8-channel (4-differential) delta-sigma analog-to-digital converter from Analog Devices. It features selectable speed and resolution with no latency between conversion results or shifts in DC accuracy. The device operates on a single 4.5V to 5.5V supply, drawing 11mA during conversion and 30µA in sleep mode. Key electrical specifications include a maximum integral nonlinearity of 15ppm of VREF, an offset error of 5µV, and input common-mode rejection of 120dB. It utilizes a proprietary architecture ensuring guaranteed modulator stability.

Analog To Digital Converters (ADC) Feature Summary

• 24-bit resolution with up to 8 differential or 16 single-ended input channels
• Selectable speed/resolution combinations ranging from 6.9Hz/280nVRMS to 3.5kHz/25µVRMS
• No latency mode ensures accurate data immediately after channel selection
• Internal oscillator eliminates the need for external timing components

Analog To Digital Converters (ADC) Applications

• High-speed multiplexing systems
• Weight scales
• Auto-ranging 6-digit digital voltmeters
• Direct temperature measurement

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix #PBF indicates a lead-free finish and tube packaging. Confirm the 'I' grade designation corresponds to the –40°C to 85°C operating temperature range. Ensure the QFN-38 package dimensions match the PCB footprint requirements, specifically noting the exposed ground pad connection.

Analog To Digital Converters (ADC) Selection Notes

Select this component when low noise and high speed are required simultaneously without settling delays. The LTC2444 supports both internal and external clock sources via the FO pin. For applications requiring external buffering, consider the LTC2445 variant which includes MUXOUT/ADCIN pins, as the LTC2444 lacks these dedicated outputs.

Analog To Digital Converters (ADC) Part Context

This part belongs to the LTC2444/LTC2445/LTC2448/LTC2449 family of 24-bit delta-sigma ADCs. While sharing the same core architecture and interface, the LTC2444 is distinguished by its 8-channel configuration and lack of external buffer outputs compared to the LTC2445. It shares the 38-lead QFN package with other variants in the series.

Analog To Digital Converters (ADC) Replacement Considerations

Public confirmed substitute part numbers: None identified in verified documentation.