LTC1164-5CSW#PBF

Overview

The LTC1164-5CSW#PBF is a monolithic 8th-order lowpass filter in a 16-lead SO Wide package. It provides pin-selectable Butterworth or Bessel responses with a cutoff frequency up to 20kHz. Supply current is 4mA at ±5V and 2.5mA at single 5V. Wideband noise is 100µVRMS, and THD is less than 0.02%. The device operates on supplies from ±2.375V to ±8V and accepts TTL/CMOS clocks up to 1MHz.

Feature Summary

• Pin-selectable response configuration for Butterworth or Bessel filtering
• Clock-tunable cutoff frequency without external components
• Low power consumption suitable for battery-operated instruments
• Single supply operation capability with minimized clock feedthrough

Applications

• Anti-aliasing filters
• Battery-operated instruments
• Telecommunications filters
• Smoothing filters

Procurement Notes

Verify the suffix #PBF indicates lead-free compliance. Confirm the SW package designation matches the required 16-lead plastic small outline wide footprint. Ensure the C temperature grade meets the operational range requirements. Cross-reference the datasheet revision to confirm pinout consistency.

Selection Notes

Select this component when an 8th-order lowpass response is required with minimal external parts. Choose the Butterworth mode for maximally flat passband gain or Bessel for linear phase characteristics. Verify that the application clock frequency supports the desired cutoff ratio of 50:1, 100:1, or 140:1 within the specified supply voltage limits.

Part Context

This part belongs to the LTC1164 family of switched-capacitor filters. It is pin-compatible with the LTC1064-2 and LTC1064-3. The CSW variant specifically denotes the 16-lead SOIC wide package format, distinguishing it from the 14-lead DIP options available in the same series.

Replacement Considerations

The LTC1064-2 and LTC1064-3 are pin-compatible alternatives within the same family. For elliptic responses, consider the LTC1164-6 or LTC1064-4. Verify that substitute devices support the specific clock-to-cutoff ratios and supply voltage ranges required by the design.

FAQ

How is the filter response type selected?

The response is determined by the DC level at Pin 10. Connecting Pin 10 to V+ or V– selects the Butterworth response, while connecting it to ground selects the 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 the 50:1 mode affect performance?

The 50:1 mode allows the input signal frequency to reach the clock frequency before aliasing occurs. It requires shorting Pin 1 to Pin 13 and setting Pin 10 to V+.