LTC1563 - Active RC, 4th Order Lowpass Filter Family

The LTC1563-2/LTC1563-3 are a family of extremely easy-to-use, active RC lowpass filters with rail-to-rail inputs and outputs and low DC offset suitable for systems with a resolution of up to 16 bits. The LTC1563-2, with a single resistor value, gives a unity-gain Butterworth response. The LTC1563-3, with a single resistor value, gives a unity-gain Bessel response. The proprietary architecture of these parts allows for a simple resistor calculation: R = 10k (256kHz/fC); fC = Cutoff Frequency For many applications, this formula is all that is needed to design a filter. By simply utilizing different valued resistors, gain and other responses are achieved. The LTC1563-X features a low power mode, for the lower frequency applications, where the supply current is reduced by an order of magnitude and a near zero power shutdown mode. The LTC1563-Xs are available in the narrow SSOP-16 package (Same footprint as an SO-8 package).

Features
  • Extremely Easy to Use—A Single Resistor Value Sets the Cutoff Frequency (256Hz < fC < 256kHz)
  • Extremely Flexible—Different Resistor Values Allow Arbitrary Transfer Functions with or without Gain (256Hz < fC<256kHz)
  • Supports Cutoff Frequencies Up to 360kHz Using FilterCAD™
  • LTC1563-2: Unity-Gain Butterworth Response Uses a Single Resistor Value, Different Resistor Values Allow Other Responses with or without Gain
  • LTC1563-3: Unity-Gain Bessel Response Uses a Single Resistor Value, Different Resistor Values Allow Other Responses with or without Gain
  • Rail-to-Rail Input and Output Voltages
  • Operates from a Single 3V (2.7V Min) to ±5V Supply
  • Low Noise: 36µVRMS for fC = 25.6kHz, 60µVRMS for fC = 256kHz
  • fC Accuracy < ±2% (Typ)
  • DC Offset < 1mV
  • Cascadable to Form 8th Order Lowpass Filters
  • Available in Narrow SSOP-16 Package
Typical Application
LTC1563 Typical Application
LTC1563 Typical Application
Applications
  • Discrete RC Active Filters and Modules
  • Antialiasing Filters
  • Smoothing or Reconstruction Filters
  • Linear Phase Filtering for Data Communication
  • Phase Locked Loops
Packaging
LTC1563 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC1563-2CGN#PBFSSOP-16C$2.35$1.95
LTC1563-2CGN#TRPBFSSOP-16C$2.01
LTC1563-2IGN#PBFSSOP-16I$2.60$2.15
LTC1563-2IGN#TRPBFSSOP-16I$2.21
LTC1563-3CGN#PBFSSOP-16C$2.35$1.95
LTC1563-3CGN#TRPBFSSOP-16C$2.01
LTC1563-3IGN#PBFSSOP-16I$2.60$2.15
LTC1563-3IGN#TRPBFSSOP-16I$2.21
Demo Boards
Part NumberDescriptionPrice
DC338B-ALTC1563-2CGN Demo Board | Universal Lowpass Filter$50.00
DC338B-BLTC1563-3CGN Demo Board | Universal Lowpass Filter$50.00
Datasheet
Design Note
Reliability Data
LT Journal
CAD Symbol
Related Products
LTC1563-2/LTC1563-3 - Active RC, 4th Order Lowpass Filter Family
DN245 - Free FilterCAD 3.0 Software Designs Filters Quickly and Easily
DN251 - Replace Discrete Lowpass Filters with the LTC1563 Zero Design Effort, Two Item BoM and No Surprises
R401 Reliability Data
Jun 2007 - Sub-µA RMS Current Measurement for Quartz Crystals
May 2000 DC Accurate, Rail-to-Rail Active RC Lowpass Filter Replaces Discrete Designs
May 2002 Save Space and Expense by Extracting Two Lowpass Filters Out of a Single LTC1563
LTC1563 Footprints and Symbols