LTC2499IUHF#PBF

Analog To Digital Converters (ADC) Overview

The LTC2499IUHF#PBF is a 16-channel (eight differential), 24-bit, no latency delta-sigma ADC featuring Easy Drive technology and a 2-wire I2C interface. It operates on a single supply from 2.7V to 5.5V with typical power consumption of 0.8mW at 7.5sps. The device achieves 600nV RMS noise, 2ppm INL, and includes an integrated high-accuracy temperature sensor with 1/30°C resolution. It supports programmable 50Hz, 60Hz, or simultaneous 50Hz/60Hz rejection modes and offers a GND to VCC common mode input range.

Analog To Digital Converters (ADC) Feature Summary

• Easy Drive Technology: Eliminates dynamic input current errors for direct digitization of high impedance sensors without external buffering.
• No Latency Architecture: Digital filter settles in a single cycle, ensuring valid data immediately after channel selection.
• Integrated Temperature Sensor: Provides 1/30°C resolution and 2°C absolute accuracy for internal monitoring.
• I2C Interface: Supports 27 unique addresses plus one global address for synchronization.

Analog To Digital Converters (ADC) Applications

• Data acquisition systems requiring temperature compensation
• Direct sensor digitizers for high impedance sources
• Industrial process control instrumentation

Analog To Digital Converters (ADC) Procurement Notes

Verify the ordering suffix #PBF indicates 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.

Analog To Digital Converters (ADC) Selection Notes

Select this component when rail-to-rail inputs and zero differential input current are required. Choose the IUHF variant for industrial temperature ranges over the UCUF commercial grade. Consider the 2x speed mode for applications needing higher throughput with increased power consumption.

Analog To Digital Converters (ADC) Part Context

This part belongs to the LTC2499 family of 24-bit delta-sigma ADCs. The IUHF suffix specifies the industrial temperature range and the 38-lead 5mm x 7mm plastic QFN package. It replaces older Linear Technology parts with similar multi-channel capabilities but offers enhanced Easy Drive input cancellation.

Analog To Digital Converters (ADC) Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify pin compatibility and electrical specifications before considering alternative manufacturers.

Analog To Digital Converters (ADC) FAQ

How does Easy Drive technology benefit high impedance sensors?

It automatically cancels differential input current, allowing large external source impedances and rail-to-rail input signals to be directly digitized without external amplifiers.

What is the conversion latency when switching channels?

There is no latency; the digital filter settles in a single cycle, making the first conversion valid immediately after a new channel is selected.

Can the LTC2499 measure its own temperature?

Yes, it includes an integrated high-accuracy temperature sensor with 1/30°C resolution and 2°C absolute accuracy.