LTC1563-2IGN#PBF

Overview

The LTC1563-2IGN#PBF is a fourth-order active RC lowpass filter in a 16-lead SSOP package. It provides a unity-gain Butterworth response using a single external resistor, with cutoff frequencies adjustable from 256Hz to 256kHz via the formula R = 10k(256kHz/fC). The device operates on a single supply of 3V to 11V or dual supplies up to ±5V. Key electrical parameters include a typical DC offset of ±1mV, power supply current of 8mA to 14mA in high-speed mode, and rail-to-rail input/output voltage swing capabilities.

Feature Summary

• Single-resistor cutoff frequency setting for simplified design
• Rail-to-rail input and output signal handling
• Low power mode reducing supply current by an order of magnitude
• Near-zero power shutdown state 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 #PBF indicates lead-free compliance when sourcing replacements. Confirm that the IGN designation corresponds to the industrial temperature range (-40°C to +85°C) required for the target application environment. Ensure the narrow SSOP-16 footprint matches the existing PCB layout constraints.

Selection Notes

Select this component for applications requiring a precise Butterworth response without complex external networks. Use the Low Power mode for lower frequency designs to minimize energy consumption. Consider the High Speed mode for maximum bandwidth requirements up to 256kHz. Verify that the load impedance remains above 10kΩ to maintain optimal output swing and distortion performance.

Part Context

This part belongs to the LTC1563 family of active RC filters, which also includes the LTC1563-3 variant offering a Bessel response. Both variants share identical pinouts and physical packages but differ in their internal transfer function characteristics. The family is designed to replace discrete components while maintaining high accuracy and low noise performance.

Replacement Considerations

LTC1563-2IGN#TRPBF (Tape and Reel version)

FAQ

How is the cutoff frequency determined?

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

What is the purpose of the EN pin?

The EN pin controls the shutdown state. Pulling it low enables normal operation, while leaving it open or driving it high activates a near-zero power shutdown mode.

Can the filter sections be cascaded?

Yes, two LTC1563 devices can be cascaded to form an eighth-order lowpass filter, though this will increase the total DC offset.