LTC1069-7IS8#PBF

Overview

The LTC1069-7IS8#PBF is a monolithic, clock-tunable, linear phase, 8th order lowpass filter. It operates from single 5V to dual ±5V supplies and features a raised cosine amplitude response with an alpha of one. The cutoff frequency is determined by the external clock divided by 25. Key electrical parameters include a passband gain of –1V/V, wideband noise of 140μV RMS at ±5V, and attenuation of –43dB at twice the cutoff frequency. The device is housed in an 8-lead plastic SO package and supports an industrial temperature range of –40°C to +85°C.

Feature Summary

• Provides linear phase characteristics suitable for digital communication pulse shaping
• Features a raised cosine amplitude response with sharp roll-off
• Clock-tunable operation allows flexible cutoff frequency adjustment
• Operates on single or dual power supplies

Applications

• Digital communication channel bandwidth limiting
• Antialiasing filters requiring linear phase
• Smoothing filters

Procurement Notes

Verify the specific suffix IS8#PBF confirms the industrial temperature grade and lead-free finish. Confirm the package type matches the design requirements. Ensure the clock source meets the specified rise and fall time limits to maintain performance.

Selection Notes

Select this component when a sharper roll-off than conventional Bessel filters is required while maintaining linear phase. Consider the internal sampling frequency ratio of 50:1 regarding aliasing risks. Verify that the input signal levels remain within the specified slew rate limitations for the chosen clock frequency.

Part Context

This part belongs to the LTC1069-X series of switched-capacitor filters. The 'I' designation indicates the industrial temperature range variant, distinct from the commercial grade version. The 'S8' denotes the 8-lead SOIC package configuration.

Replacement Considerations

LTC1069-7CS8#PBF (Commercial Grade)

FAQ

How is the cutoff frequency calculated?

The cutoff frequency is equal to the external clock frequency divided by 25.

What is the typical passband gain?

The typical passband gain is –1V/V.

What are the supply voltage options?

The device operates from a single 5V supply up to dual ±5V supplies.