LTC1069-7CS8#TRPBF

Overview

The LTC1069-7CS8#TRPBF is a monolithic, clock-tunable, linear phase, 8th order lowpass filter in an SO-8 package. It operates from single 5V to dual ±5V supplies. The cutoff frequency equals the external clock frequency divided by 25, tunable up to 200kHz with ±5V or 120kHz with single 5V. Passband gain is typically -1V/V. At twice the cutoff frequency, attenuation reaches -43dB. Wideband noise is 140μV RMS with ±5V supplies. Power supply current is 26mA at ±5V and 15mA at 5V.

Feature Summary

• Provides an 8th order raised cosine amplitude response for sharp roll-off characteristics.
• Features a clock-tunable architecture where the cutoff frequency is derived directly from an external digital clock signal.
• Maintains linear phase performance suitable for applications requiring minimal pulse distortion.

Applications

• Digital communication systems requiring pulse shaping and channel bandwidth limiting
• Antialiasing filters in data acquisition systems demanding linear phase response
• Smoothing filters for analog signal processing

Procurement Notes

Verify the specific ordering suffix #TRPBF confirms the tape and reel packaging format required for automated surface mount assembly. Confirm the 'C' designation indicates the commercial temperature range of 0°C to 70°C. Ensure the component matches the lead-free finish specifications defined in the manufacturer's documentation before finalizing procurement orders.

Selection Notes

Select this component when an 8th order filter response with linear phase characteristics is required within an 8-pin footprint. The cutoff frequency must be set via an external clock source ranging up to 5MHz. Verify that the system power supply supports either single 5V or dual ±5V configurations to meet the specified electrical performance parameters.

Part Context

This device belongs to the LTC1069 family of monolithic switched-capacitor filters. It shares the same 8th order topology as other variants but is specifically tuned for a raised cosine response. The CS8#TRPBF variant denotes the commercial temperature grade packaged in tape and reel format for high-volume surface mount production lines.

Replacement Considerations

The LTC1069-7IS8#TRPBF serves as the industrial temperature grade replacement, operating from –40°C to 85°C. Other family members like the LTC1064-7 offer different clock-to-cutoff ratios or noise specifications. Verify pin compatibility and clock input requirements when substituting with related parts.