LTC1563-3CGN#PBF

Overview

The LTC1563-3CGN#PBF is a fourth-order active RC lowpass filter with a Bessel response, housed in a 16-lead SSOP package. It operates from a single supply of 3V to ±5V 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 less than 1mV, power supply current of 8mA to 14mA in high-speed mode, and shutdown current below 12µA. The device supports cascading for eighth-order filtering.

Feature Summary

• Provides a unity-gain Bessel (linear phase) response using a single external resistor value.
• Features rail-to-rail input and output voltage swing capabilities.
• Includes a low-power mode that reduces supply current significantly for lower frequency applications.
• Supports shutdown functionality via the EN pin to minimize power consumption.

Applications

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

Procurement Notes

Verify the specific ordering suffix #PBF indicates lead-free compliance and tube packaging. Confirm the 'C' grade designation matches the required commercial operating temperature range of 0°C to 70°C. Ensure the SSOP-16 package footprint aligns with the target PCB design constraints.

Selection Notes

Select this component when a linear phase Bessel response is required for signal integrity. Use the High Speed mode for cutoff frequencies up to 256kHz. Utilize the Low Power mode if minimizing supply current is critical for frequencies below 25.6kHz. Consider cascading two units to achieve an eighth-order filter characteristic.

Part Context

This part belongs to the LTC1563 family of active RC filters, which also includes the LTC1563-2 variant offering a Butterworth response. Both variants share identical pinouts and operational modes but differ in their internal transfer function characteristics. The CGN suffix specifically denotes the commercial temperature grade and SSOP-16 plastic package.

Replacement Considerations

LTC1563-3IGN#PBF offers the same Bessel response but in the industrial temperature grade (-40°C to 85°C). LTC1563-2 variants provide a Butterworth response instead of Bessel. Verify that any substitute maintains the 16-SSOP package and compatible supply voltage ranges.