LTC1563-3IGN#TRPBF

Overview

The LTC1563-3IGN#TRPBF is a fourth-order active RC lowpass filter with a Bessel response, housed in a 16-lead SSOP package. It operates from a single 3V to ±5V supply and features rail-to-rail inputs and outputs. The cutoff frequency is set by a single external resistor, ranging from 256Hz to 256kHz in high-speed mode. Key electrical parameters include a typical DC offset of 3mV, power supply current of 17mA in high-speed mode, and noise of 60µVRMS at a 256kHz cutoff.

Feature Summary

• Provides a unity-gain Bessel transfer function using a single external resistor value for cutoff frequency setting.
• Features rail-to-rail input and output voltage swing capabilities suitable for low-voltage systems.
• Includes a low-power operating mode that reduces supply current significantly compared to the standard high-speed mode.

Applications

• Antialiasing filters for data acquisition systems
• Smoothing or reconstruction filters in signal processing chains
• Linear phase filtering applications requiring minimal group delay distortion

Procurement Notes

Verify the #TRPBF suffix indicates tape and reel packaging and lead-free compliance. Confirm the IGN suffix corresponds to the industrial temperature range (-40°C to 85°C). Ensure the order quantity matches the reel specifications provided by the distributor.

Selection Notes

Select this component when a Bessel response is required for linear phase characteristics. Use the high-speed mode for frequencies up to 256kHz and the low-power mode for lower frequency applications to minimize current consumption. Ensure the load resistance exceeds 10kΩ for optimal output swing.

Part Context

This part belongs to the LTC1563 family of active RC filters. The -3 variant specifically provides a Bessel response, whereas the -2 variant offers a Butterworth response. Both share identical pinouts and operational modes but differ in their internal pole placement for distinct frequency responses.

Replacement Considerations

LTC1563-3IGN#PBF (Tube Packaging)

FAQ

How is the cutoff frequency determined?

The cutoff frequency is set by a single external resistor connected to the filter. The formula R = 10k(256kHz/fC) applies for unity-gain designs.

What is the purpose of the EN pin?

The EN pin controls the shutdown state. Pulling it low enables the device, while leaving it open or driving it high places the device in a low-current shutdown mode.

Can the sections be cascaded?

Yes, the two second-order sections within the device can be cascaded to form an eighth-order lowpass filter.