LTC1164-5CSW#TRPBF

Overview

The LTC1164-5CSW#TRPBF is a monolithic 8th-order active lowpass filter offering pin-selectable Butterworth or Bessel frequency responses. It features a clock-tunable cutoff frequency with a maximum of 20kHz, driven by a TTL/CMOS-compatible clock input. The device consumes 4mA supply current with ±5V supplies and operates on a single 5V supply. Key electrical parameters include 100µVRMS wideband noise, THD less than 0.02%, and a maximum clock frequency of 1MHz at ±5V or single 5V operation. It is housed in a 16-lead SO Wide package.

Feature Summary

• Pin-selectable configuration allows switching between Butterworth and Bessel filter responses without external components.
• Clock-tunable cutoff frequency enables precise adjustment of the filter bandwidth via an external digital clock signal.
• Low power consumption design maintains high signal-to-noise ratio and low distortion while operating efficiently.
• Integrated anti-aliasing capability supports both standard and double-sampling modes to prevent frequency folding.

Applications

• Anti-aliasing filters for data acquisition systems
• Battery-operated instruments requiring low power consumption
• Telecommunications signal processing
• Smoothing filters in precision measurement circuits

Procurement Notes

Verify the specific suffix #TRPBF indicates lead-free tape and reel packaging. Confirm the CSW designation corresponds to the 16-lead SO Wide plastic package. Ensure the C grade meets the required -40°C to 85°C operating temperature range for the target application environment.

Selection Notes

Select this component when an 8th-order response is required with minimal external parts. Choose the Butterworth mode for maximally flat passband gain or Bessel mode for linear phase characteristics. Ensure the available clock frequency allows for the desired cutoff ratio (50:1, 100:1, or 140:1) based on the specific noise and aliasing requirements.

Part Context

This part belongs to the LTC1164 family of low-power active filters. It is pin-compatible with the LTC1064-2 and LTC1064-3, allowing for direct upgrades or replacements in existing designs that utilize those earlier generations. The device integrates the necessary switched-capacitor circuitry into a single monolithic chip.

Replacement Considerations

The LTC1064-2 and LTC1064-3 are pin-compatible alternatives within the same family. Verify that the legacy parts meet the specific voltage and temperature requirements if substituting into a design originally specified for the LTC1164-5.

FAQ

How is the filter response type selected?

The response is determined by the DC level at Pin 10. Connecting Pin 10 to V+ provides a Butterworth response, while connecting it to ground provides a Bessel response.

What is the maximum clock frequency supported?

The maximum clock frequency is 1.5MHz with ±7.5V supplies, and 1MHz with ±5V or single 5V supplies.

How does double-sampling affect aliasing?

Double-sampling (50:1 ratio) allows the input signal frequency to reach twice the clock frequency before aliasing occurs, effectively doubling the anti-aliasing protection compared to the standard 100:1 ratio.