LTC1068-25CG#PBF

Overview

The LTC1068-25CG#PBF is a clock-tunable, quad second-order switched-capacitor filter building block in a 28-pin SSOP package. It features four matched sections with a nominal clock-to-center frequency ratio of 25:1. The device operates on supply voltages ranging from 3.14V to ±5.5V and draws up to 15mA at ±5V. Key electrical parameters include a typical center frequency error of ±0.3%, Q accuracy of ±1%, and a maximum clock frequency of 5.6MHz. Noise performance is specified at 90µVRMS for Q ≤ 5.

Feature Summary

• Contains four identical second-order filter sections within a single surface-mount package
• Clock-tunable architecture allows external adjustment of the center frequency via an input clock signal
• Supports multiple operating modes including notch, highpass, bandpass, and lowpass configurations
• Designed for low noise operation suitable for precision analog signal processing

Applications

• Dual matched fourth-order Butterworth lowpass filters
• High-speed active filtering requiring tunable center frequencies
• Bandpass or bandreject (notch) filter implementations
• Lowpass or highpass filter designs using cascaded second-order sections

Procurement Notes

Verify the specific suffix CG#PBF against the manufacturer's current ordering information to confirm lead-free finish and tape-and-reel packaging availability. Ensure the component meets the required industrial temperature range specifications for the target application environment before finalizing procurement.

Selection Notes

Select this part when a fixed 25:1 clock-to-center frequency ratio is required. Compare against other family members like the LTC1068-50 or LTC1068-200 if different tuning ratios are needed. Consider the maximum clock frequency limits relative to the desired center frequency and Q factor to ensure stable operation within the specified electrical characteristics.

Part Context

This component belongs to the LTC1068 product family, which includes variants with different nominal clock-to-center frequency ratios such as 200:1, 100:1, and 50:1. All family members share the same 28-lead SSOP package and internal architecture but differ in their default tuning capabilities and associated frequency ranges.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.