LTC1064-4CSW#TRPBF

Overview

The LTC1064-4CSW#TRPBF is an 8th-order, clock-sweepable Cauer lowpass switched-capacitor filter manufactured by Analog Devices Inc. It operates on a ±2.37V to ±8V power supply range and accepts TTL or CMOS clocks up to 5MHz. The device provides a 50:1 fCLK to fCUTOFF ratio for Cauer response (up to 100kHz cutoff) or a 100:1 ratio for transitional Butterworth-Cauer response (up to 50kHz cutoff). Key electrical specifications include a wideband noise of 135µVRMS at ±7.5V, total harmonic distortion of 0.03% at 3VRMS input, and stopband attenuation of 80dB at 2×fCUTOFF. It is housed in a 16-lead SO-Wide package.

Feature Summary

• Provides high-performance filtering with 80dB stopband attenuation at twice the cutoff frequency.
• Features low noise and low harmonic distortion suitable for demanding signal processing applications.
• Offers selectable filter responses via Pin 10 configuration for either Cauer or transitional characteristics.

Applications

• Antialiasing filters
• Telecom filters
• Sinewave generators

Procurement Notes

Verify the specific suffix #TRPBF indicates tape and reel packaging when sourcing this component. Confirm that the manufacturer is Analog Devices Inc. and ensure the part number matches the 16-lead SO-Wide package format. Cross-reference the datasheet revision to confirm compatibility with current design requirements.

Selection Notes

Select this component when an 8th-order lowpass filter is required within a compact footprint. Choose the 50:1 ratio mode for higher cutoff frequencies up to 100kHz or the 100:1 ratio mode for lower noise and delay nonlinearity up to 50kHz. Ensure the external clock source meets the specified voltage levels and frequency limits.

Part Context

This part belongs to the LTC1064 family of switched-capacitor filters. It is pin-compatible with the LTC1064-1, LTC1064-2, and LTC1064-3 variants. The CSW designation identifies the 16-lead plastic wide small outline package, while the #TRPBF suffix denotes the tape and reel packaging option.

Replacement Considerations

The LTC1064-1, LTC1064-2, and LTC1064-3 are confirmed pin-compatible substitutes within the same family. These alternatives offer different filter characteristics but maintain physical interchangeability in existing designs.

FAQ

How is the filter response type determined?

Connecting Pin 10 to V+ selects the 50:1 Cauer response, while connecting it to V– selects the 100:1 transitional Butterworth-Cauer response.

What is the maximum operating clock frequency?

The maximum clock frequency is 5MHz when operating with ±7.5V power supplies.

Does the device require external components for compensation?

Yes, achieving minimum passband ripple and cutoff frequencies above 20kHz requires external compensating capacitors connected to COMP1 and COMP2 pins.