LTC2435-1IGN#TRPBF

Analog To Digital Converters (ADC) Overview

The LTC2435-1IGN#TRPBF is a 20-bit delta-sigma analog-to-digital converter (ADC) from Analog Devices Inc., housed in a 16-lead SSOP 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 4µA in sleep mode. The device features differential inputs and a differential reference, providing an integral nonlinearity of 3ppm and 0.8ppm RMS noise. The LTC2435-1 variant specifically offers simultaneous 50Hz and 60Hz line frequency rejection over the range of 49Hz to 61.2Hz. It utilizes a flexible 3-wire digital interface compatible with SPI and MICROWIRE protocols.

Analog To Digital Converters (ADC) Feature Summary

• 20-Bit Resolution: No missing codes with 3ppm INL and 0.8ppm RMS noise.
• Simultaneous Line Rejection: Filters both 50Hz and 60Hz interference simultaneously (49Hz–61.2Hz range).
• Differential Architecture: Accepts differential input and reference voltages with GND to VCC common mode range.
• Low Power Consumption: 200µA active current; 4µA in auto-sleep mode when CS is HIGH.

Analog To Digital Converters (ADC) Applications

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

Analog To Digital Converters (ADC) Procurement Notes

Verify the suffix 'IGN' indicates the industrial temperature range (-40°C to 85°C) and '#TRPBF' denotes tape and reel packaging with lead-free finish. Confirm the specific '-1' designation ensures simultaneous 50Hz/60Hz notch filtering capabilities compared to the standard LTC2435 model.

Analog To Digital Converters (ADC) Selection Notes

Select the LTC2435-1 variant over the LTC2435 if simultaneous rejection of both 50Hz and 60Hz power line frequencies is required. Ensure the application supports the 3-wire serial interface timing requirements. Verify that the external reference voltage remains within the 0.1V to VCC range for optimal performance.

Analog To Digital Converters (ADC) Part Context

This component belongs to the LTC2435/LTC2435-1 family of micropower 20-bit ADCs. It serves as a high-speed, no-latency alternative to previous generations like the LTC2430, offering doubled output rates while maintaining line frequency rejection without requiring external oscillator components.

Analog To Digital Converters (ADC) Replacement Considerations

The LTC2435CGN#TRPBF or LTC2435IGN#TRPBF are functionally similar but lack the simultaneous 50Hz/60Hz rejection feature of the -1 variant. The LTC2430IGN#TRPBF is a slower predecessor with different calibration characteristics and lower output data rates.

Analog To Digital Converters (ADC) FAQ

How does the LTC2435-1 handle line frequency interference?

The LTC2435-1 provides better than 87dB input differential mode rejection over the range of 49Hz to 61.2Hz, allowing it to reject both 50Hz and 60Hz interference simultaneously.

What is the maximum linear error specified for this ADC?

The Integral Nonlinearity (INL) is specified at 3ppm of VREF, ensuring no missing codes across the full operating temperature range.

Can the device operate with an external clock source?

Yes, the FO pin can be driven by an external oscillator to define a user-defined rejection frequency located at fEOSC/2560.