LTC1068-50IG#TRPBF

Overview

The LTC1068-50IG#TRPBF is a clock-tunable, quad second-order switched-capacitor filter building block from Analog Devices. It integrates four matched low-noise sections within a 28-lead SSOP package. The device features a nominal clock-to-center frequency ratio of 50:1. It operates on supply voltages ranging from 3.14V to 5.5V single supply or ±5V dual supply. Key electrical parameters include a typical power supply current of 4.5mA at 5V, a GBW product of 4MHz, and a slew rate of 7V/µs. The operating temperature range for the 'I' grade is -40°C to +85°C.

Feature Summary

• Contains four identical second-order filter sections with low noise performance suitable for precision applications.
• Supports multiple filter topologies including lowpass, highpass, bandpass, and notch configurations via external resistor networks.
• Offers flexible clock tuning capabilities allowing adjustment of the center frequency relative to the input clock signal.

Applications

• Dual matched fourth-order Butterworth lowpass filters
• Clock-tunable bandpass filter banks
• Precision instrumentation signal conditioning

Procurement Notes

Verify the specific ordering suffix #TRPBF indicates tape and reel packaging when sourcing components. Confirm that the 'I' suffix corresponds to the industrial temperature range requirements for your specific design environment. Ensure compatibility with the 28-lead SSOP footprint during PCB layout verification.

Selection Notes

Select this component when a fixed 50:1 clock-to-frequency ratio is required. Compare against other family members like the LTC1068-25 or LTC1068-200 if different tuning ratios are needed. Consider the 4MHz GBW limit when designing for higher Q factors or faster clock frequencies.

Part Context

This part belongs to the LTC1068 series of universal switched-capaculator filters. The series includes variants with different nominal clock ratios such as 25:1, 100:1, and 200:1. All variants share the same internal architecture and pinout but differ in their default tuning characteristics.

Replacement Considerations

LTC1068-50CG#TRPBF offers the same functionality with a commercial temperature range (0°C to 70°C) instead of the industrial range.