LTC2447IUHF#PBF

Analog To Digital Converters (ADC) Overview

The LTC2447IUHF#PBF is a 24-bit, 8-channel Delta-Sigma ADC in a 38-lead QFN package. It features four selectable differential input sets and five differential reference inputs for multiplexed ratiometric measurements. The device offers absolute accuracy of 15ppm, noise as low as 200nV RMS, and output speeds up to 8kHz. It includes MUXOUT/ADCIN pins for external buffering or gain. Operating at 4.5V to 5.5V, it supports internal or external clocks with no latency between conversions.

Analog To Digital Converters (ADC) Feature Summary

• 24-bit resolution with 15ppm absolute accuracy and 200nV RMS noise
• Eight single-ended or four differential inputs with five selectable differential references
• MUXOUT/ADCIN pins enable external buffering or gain stages
• No latency mode allows valid data immediately after channel or reference changes

Analog To Digital Converters (ADC) Applications

• Flow measurement systems
• Weight scales
• Pressure sensors
• Direct temperature measurement
• Gas chromatography

Analog To Digital Converters (ADC) Procurement Notes

Verify the suffix #PBF indicates lead-free RoHS compliance. Confirm the IUHF designation corresponds to the industrial temperature range of –40°C to 85°C. Ensure the QFN-38 (5mm × 7mm) package matches the PCB footprint requirements. Check that the exposed pad (Pin 39) is soldered to ground for proper operation.

Analog To Digital Converters (ADC) Selection Notes

Select the LTC2447 over the LTC2446 if external buffering or gain is required via the MUXOUT/ADCIN pins. Choose the I-grade version for industrial temperature applications (-40°C to 85°C). Ensure the application requires multiple independent reference inputs for ratiometric sensing. Verify power supply constraints fit within the 4.5V to 5.5V operating range.

Analog To Digital Converters (ADC) Part Context

This component belongs to the LTC2446/LTC2447 family of high-speed, multi-channel Delta-Sigma ADCs. The primary distinction from the LTC2446 is the inclusion of MUXOUT and ADCIN pins on the LTC2447, allowing integration of external amplifiers. Both share identical architecture, pinouts, and electrical performance characteristics except for the specific buffer interface availability.

Analog To Digital Converters (ADC) Replacement Considerations

LTC2446IUHF#PBF serves as a direct functional substitute if external buffering is not utilized, as the MUXOUT/ADCIN pins are internally connected in the LTC2446 for optimal performance.