LTC1068-200IG#PBF

Overview

The LTC1068-200IG#PBF 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-pin SSOP package. The device features a fixed clock-to-center frequency ratio of 200:1. It operates on supply voltages ranging from 3.14V to 5.5V and supports industrial temperature ranges from -40°C to +85°C. Key electrical parameters include a typical power supply current of 8mA at 4.75V, a maximum clock frequency of 5.6MHz, and a center frequency error of ±0.3% typical.

Feature Summary

• Integrates four identical second-order filter sections with high accuracy and low noise characteristics.
• Features a fixed internal clock-to-center frequency ratio of 200:1 for precise tuning applications.
• Supports multiple operating modes including notch, bandpass, lowpass, and highpass configurations via external resistors.

Applications

• Dual matched fourth-order Butterworth lowpass filters
• Clock-tunable bandpass or bandreject (notch) filters
• Universal low noise eighth-order filter building blocks

Procurement Notes

Verify the specific suffix IG#PBF corresponds to the industrial temperature range (-40°C to +85°C) and lead-free finish. Confirm the package type is 28-lead plastic SSOP. Ensure the clock-to-center frequency ratio requirement matches the 200:1 specification before ordering.

Selection Notes

Select this component when a 200:1 clock-to-center frequency ratio is required. Compare against LTC1068 (100:1), LTC1068-50 (50:1), and LTC1068-25 (25:1) based on the desired center frequency relative to the available clock source. Consider the Q factor limits defined in the performance graphs for the chosen operating mode.

Part Context

This part belongs to the LTC1068 series of universal switched-capacitor filters. The series differentiates models primarily by their nominal clock-to-center frequency ratios. The 'I' designation indicates the industrial temperature grade, while 'G#PBF' denotes the lead-free packaging standard used by Analog Devices.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult Analog Devices marketing for customized versions or alternative family members if pin compatibility is not required.

FAQ

What is the nominal clock-to-center frequency ratio for the LTC1068-200?

The nominal clock-to-center frequency ratio is set to 200:1.

How many second-order filter sections are contained in the LTC1068-200?

The device contains four monolithic, matched, low-noise second-order switched-capacitor filter sections.

What is the typical center frequency error for the LTC1068-200?

The typical center frequency error is ±0.3%, with a maximum error of ±0.8%.