LTC1068CG#TRPBF

Overview

The LTC1068CG#TRPBF is a clock-tunable, quad second-order switched-capacitor filter building block housed in a 28-lead SSOP package. It contains four matched low-noise sections with a nominal clock-to-center frequency ratio of 100:1. The device operates on a single 5V supply (3.14V to 5.5V) or dual ±5V supplies, drawing 4.5mA typical current at 5V. It supports lowpass, highpass, bandpass, and notch configurations via external resistors, offering a center frequency error of ±0.3% typical and ±0.8% maximum.

Feature Summary

• Integrates four identical second-order switched-capaculator filter sections within a single surface-mount package.
• Provides precise center frequency tuning through an external clock source with minimal inherent frequency error.
• Supports versatile filter topologies including lowpass, highpass, bandpass, and notch functions using external resistor networks.

Applications

• Dual matched fourth-order Butterworth lowpass filters
• Universal low noise eighth order filter building blocks
• Clock-tunable signal conditioning circuits

Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm lead-free status and tape-and-reel packaging configuration. Ensure the component matches the commercial temperature range specifications required for the target application environment before finalizing procurement orders.

Selection Notes

Select this variant when a fixed 100:1 clock-to-center frequency ratio is appropriate for the design. Consider alternative family members like the LTC1068-50 or LTC1068-25 if different tuning ratios are necessary. Verify that the required operating frequency range falls within the supported limits for the chosen power supply voltage.

Part Context

This component belongs to the LTC1068 series of universal switched-capacitor filters. The series includes variants with different nominal clock-to-center frequency ratios, such as 200:1, 50:1, and 25:1. All variants share similar internal architectures and pinouts but differ in their default tuning characteristics and supported frequency ranges.

Replacement Considerations

LTC1068IG#TRPBF

FAQ

What is the nominal clock-to-center frequency ratio for the LTC1068?

The nominal ratio is 100:1, meaning the center frequency is one-hundredth of the applied clock frequency.

Can the LTC1068 operate with a single supply voltage?

Yes, it can operate with a single 5V supply or a single 3.3V supply, provided the analog ground pin is properly biased and bypassed.

How many filter sections are integrated into the LTC1068 package?

The device integrates four identical second-order filter sections, allowing for the construction of higher-order filters by cascading them.