LTC2439-1IGN#PBF

Analog To Digital Converters (ADC) Overview

The LTC2439-1IGN#PBF is a 16-channel (8-differential) micropower 16-bit delta-sigma analog-to-digital converter in a 28-lead SSOP package. It operates from a single supply of 2.7V to 5.5V with an internal oscillator requiring no external components. Key electrical specifications include 0.12 LSB typical integral nonlinearity, 1µV RMS noise independent of the reference voltage, and a maximum supply current of 200µA during conversion. The device features a flexible 4-wire digital interface compatible with SPI and MICROWIRE protocols.

Analog To Digital Converters (ADC) Feature Summary

• 16-Bit Resolution: No missing codes guaranteed over the full operating temperature range.
• Low Power Consumption: 200µA supply current in conversion mode; reduces to 4µA in autosleep mode when CS is high.
• Integrated Oscillator: Eliminates need for external frequency-setting components; provides simultaneous 50Hz/60Hz rejection.
• Flexible Reference Input: Accepts differential reference voltages from 0.1V to VCC, enabling low-step-size measurements.

Analog To Digital Converters (ADC) Applications

• Direct Sensor Digitizer
• Weight Scales
• Gas Analyzers
• Strain Gauge Transducers
• Industrial Process Control

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific ordering suffix '#PBF' indicates lead-free finish and RoHS compliance as per Analog Devices standards. Confirm the 'I' grade designation matches the required industrial temperature range of –40°C to +85°C. Ensure the SSOP-28 package dimensions align with the target PCB footprint constraints before finalizing procurement.

Analog To Digital Converters (ADC) Selection Notes

Select this component for multiplexed applications requiring single-cycle settling time due to its no-latency architecture. Choose the IGN variant specifically for environments requiring operation down to –40°C. Verify that the external reference voltage range supports the desired input signal span, noting that lower reference voltages improve effective resolution by reducing the LSB step size below the fixed 1µV RMS noise floor.

Analog To Digital Converters (ADC) Part Context

This part belongs to the LTC2439-1 family of micropower ADCs. It is pin-compatible with the 24-bit LTC2418, facilitating potential upgrades in existing designs. The device utilizes a proprietary delta-sigma technology designed to provide high accuracy with minimal external support circuitry, distinguishing it from faster SAR architectures.

Analog To Digital Converters (ADC) Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should verify pin compatibility with the LTC2418 if upgrading resolution is considered.