LTC1067IS#TRPBF

Overview

The LTC1067IS#TRPBF is a dual, rail-to-rail, very low noise universal switched-capacitor building block. It integrates two identical second-order filter sections in a 16-lead SSOP package. The center frequency is tuned by an external clock with a nominal ratio of 100:1. Operating from a single 3V to –5V supply, it provides over 80dB dynamic range. Key electrical parameters include a typical power supply current of 4.5mA at 250kHz clock, a DC open-loop gain of 90dB, and a gain-bandwidth product of 2.8MHz. The device supports multiple operating modes for various filter topologies.

Feature Summary

• Rail-to-rail input and output operation enables compatibility with low voltage single-supply systems.
• Dual second-order filter architecture allows for the construction of high-precision fourth-order filters using minimal external components.
• Switched-capacitor design utilizes an external clock signal to set the center frequency, offering flexible tuning capabilities.

Applications

• Notch filters
• Narrowband bandpass filters
• Tone detection circuits
• Noise reduction systems

Procurement Notes

Verify the specific suffix TRPBF indicates tape and reel packaging when sourcing this component. Confirm the IS designation corresponds to the industrial temperature range specifications required for the intended application environment. Ensure the supplier provides valid traceability documentation consistent with Analog Devices manufacturing standards.

Selection Notes

Select the LTC1067 variant over the LTC1067-50 if a higher clock-to-center frequency ratio is required for lower clock frequencies. Consider the thermal characteristics of the SSOP package for heat dissipation requirements. Evaluate the maximum Q versus center frequency graphs to ensure stability within the desired operating conditions and supply voltages.

Part Context

This component belongs to the LTC1067 family of universal switched-capacitor filters. It shares architectural similarities with other Linear Technology precision analog building blocks but is specifically optimized for low-noise, high-dynamic-range filtering applications requiring precise frequency control via external clocks.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult Analog Devices directly for potential cross-references or updated component recommendations.

FAQ

How is the center frequency of the LTC1067 determined?

The center frequency is determined by the external clock frequency applied to Pin 16. For the LTC1067, the nominal internal clock-to-center frequency ratio is fixed at 100:1, though this can be modified using external resistors in specific operating modes.

What is the recommended clock source for the CLK pin?

Any CMOS logic clock source with a square-wave output and a 50% duty cycle (±10%) is adequate. The clock source power supply should be isolated from the filter's power supply, and the analog ground should connect to the clock ground at a single point.

Can the LTC1067 operate with a single supply voltage?

Yes, the device operates from a single supply ranging from 3V to 11V (with V– grounded) or dual supplies up to ±5V. In single-supply mode, the AGND pin must be bypassed to the analog ground plane with at least a 1µF capacitor.