LTC1069-1IS8#TRPBF

Overview

The LTC1069-1IS8#TRPBF is a monolithic 8th order progressive elliptic lowpass filter housed in an 8-lead plastic SO package. It operates from single 3.3V to ±5V power supplies, drawing 2mA at 3.3V and 3.8mA at ±5V. The cutoff frequency equals the clock frequency divided by 100, with a maximum clock of 0.5MHz at 3.3V and 1.2MHz at ±5V. Wideband noise is 110μV RMS, and stopband attenuation reaches -70dB at 2fCUTOFF.

Feature Summary

• Monolithic 8th order progressive elliptic lowpass filter architecture
• Clock-tunable cutoff frequency capability
• Single supply operation down to 3.3V
• Low power consumption across voltage ranges

Applications

• Telecommunication filters
• Antialiasing filters

Procurement Notes

Verify the IS8 suffix indicates industrial temperature range (-40°C to 85°C) and TRPBF confirms tape and reel packaging with lead-free finish. Confirm RoHS compliance status as datasheet references may vary by revision. Ensure ordering matches exact package and temperature grade requirements for production integration.

Selection Notes

Select this component when an 8th order elliptic response is required with tight passband ripple. Verify that the external clock source can provide the necessary frequency division ratio of 100. Consider the 110μV RMS wideband noise floor for dynamic range requirements. Ensure the application supports the specified TTL or CMOS clock input levels.

Part Context

This part belongs to the LTC1069 family of switched capacitor filters. It shares architectural similarities with the LTC1069-6 but differs in supply voltage specifications and clock-to-cutoff ratios. The IS8 variant specifically denotes the industrial temperature grade within the narrow SOIC package lineup.

Replacement Considerations

LTC1069-1CS8#TRPBF (Commercial grade)

FAQ

How is the cutoff frequency determined?

The cutoff frequency is equal to the clock frequency divided by 100.

What is the maximum clock frequency at 3.3V supply?

The maximum clock frequency is 0.5MHz when operating from a single 3.3V supply.

What is the stopband attenuation at twice the cutoff frequency?

The stopband attenuation reaches -70dB at 2fCUTOFF.