LTC1069-7IS8#TRPBF

Overview

The LTC1069-7IS8#TRPBF is a monolithic, clock-tunable, linear phase, 8th order lowpass filter housed in an 8-lead plastic SO package. The cutoff frequency is determined by an external clock signal and equals the clock frequency divided by 25. It operates from single 5V supplies up to dual ±5V power supplies. Key electrical characteristics include a typical passband gain of –1V/V, wideband noise of 140μV RMS with ±5V supplies, and attenuation of –43dB at twice the cutoff frequency. The device supports clock frequencies up to 200kHz with dual supplies and 120kHz with a single supply.

Feature Summary

• Monolithic 8th order lowpass filter with linear phase response
• Clock-tunable cutoff frequency set by external digital clock source
• Raised cosine amplitude response with sharp roll-off
• Operates on single 5V or dual ±5V power supplies

Applications

• Digital communication pulse shaping and channel bandwidth limiting
• Antialiasing filters requiring linear phase characteristics
• Smoothing filters for analog signal processing

Procurement Notes

Verify the IS8 suffix indicates the industrial temperature range (–40°C to 85°C) and the #TRPBF suffix denotes tape and reel packaging with lead-free finish. Confirm that the clock source meets TTL or CMOS levels with rise/fall times under 1μs. Ensure proper analog ground plane separation and bypassing are implemented during integration.

Selection Notes

Select this component when a higher-order filter response than conventional Bessel filters is required without complex discrete designs. The cutoff frequency must be derived from an available clock signal, as it is not internally generated. Consider the –1V/V passband gain and output drive capabilities when designing subsequent stages.

Part Context

This part belongs to the LTC1069 family of clock-tunable filters. Unlike other variants in the series, the LTC1069-7 specifically provides a passband gain of –1V/V. It shares the same 8th order architecture but differs in gain specifications compared to related parts like the LTC1069-3 or LTC1069-4.

Replacement Considerations

Public confirmed substitute part numbers: LTC1069-7CS8#TRPBF (Commercial grade). Other family members such as LTC1064-7 or LTC1264-7 offer different speed or noise profiles but require verification of specific circuit compatibility.