LTC1563-2IGN

Overview

The LTC1563-2IGN is a fourth-order active RC lowpass filter with rail-to-rail inputs and outputs, housed in a 16-lead SSOP package. It provides a unity-gain Butterworth response using a single external resistor value. The device operates from a single supply of 3V to ±5V, supporting cutoff frequencies between 256Hz and 256kHz. Key electrical parameters include a typical DC offset of less than 1mV, cutoff frequency accuracy within ±2%, and a shutdown mode current of 12µA. The part features two operating modes: High Speed and Low Power, allowing for optimized power consumption.

Feature Summary

• Rail-to-rail input and output voltage swing capability
• Single-resistor cutoff frequency setting for simplified design
• Low power mode reducing supply current by an order of magnitude
• Near zero power shutdown mode via enable pin control

Applications

• Discrete RC active filter replacement
• Antialiasing filters for data acquisition systems
• Smoothing or reconstruction filters
• Linear phase filtering for data communication
• Phase locked loops

Procurement Notes

Verify the specific suffix #TRPBF indicates tape and reel packaging when ordering. Confirm the 'I' designation matches the required industrial temperature range of -40°C to 85°C. Ensure the 16-SSOP footprint aligns with the target PCB layout constraints before finalizing procurement.

Selection Notes

Select the LTC1563-2 variant specifically for Butterworth response characteristics. Use the LTC1563-3 if a Bessel (linear phase) response is required instead. Consider the Low Power mode for applications where supply current reduction outweighs bandwidth requirements. Verify that the desired cutoff frequency falls within the supported operational limits of the selected supply voltage.

Part Context

This component belongs to the LTC1563 family of active RC filters manufactured by Analog Devices Inc. The family includes the LTC1563-2 for Butterworth responses and the LTC1563-3 for Bessel responses. Both variants share identical pinouts and physical packages but differ in internal transfer function configurations.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Evaluate alternative components based on matching fourth-order topology, rail-to-rail capabilities, and compatible supply voltage ranges.

FAQ

How is the cutoff frequency determined?

The cutoff frequency is set by a single external resistor using the formula R = 10k(256kHz/fC).

What is the purpose of the EN pin?

The EN pin controls the shutdown state; pulling it high or leaving it open enters shutdown, while connecting it to V- enables normal operation.

Can the sections be cascaded?

Yes, the two second-order sections can be cascaded internally or externally to form higher-order filters, such as an 8th-order lowpass filter.