Features and Benefits

  • Four Identical 2nd Order Filter Sections in an SSOP Package
  • 2nd Order Section Center Frequency Error:
    • ±0.3% Typical and ±0.8% Maximum
  • Low Noise per 2nd Order Section, Q ≤ 5:
    • LTC1068-200 50µVRMS, LTC1068 50µVRMS
    •  LTC1068-50 70µVRMS, LTC1068-25 90µVRMS
  • Low Power Supply Current: 4.5mA, Single 5V, LTC1068-50
  • Operation with ±5V Power Supply, Single 5V Supply or Single 3.3V Supply

Product Details

The LTC1068 product family consists of four monolithic clock-tunable filter building blocks. Each product contains four matched, low noise, high accuracy 2nd order switched-capacitor filter sections. An external clock tunes the center frequency of each 2nd order filter section. The LTC1068 products differ only in their clock-to-center frequency ratio. The clock-to-center frequency ratio is set to 200:1 (LTC1068-200), 100:1 (LTC1068), 50:1 (LTC1068-50) or 25:1 (LTC1068-25). External resistors can modify the clock-to-center frequency ratio. High performance, quad 2nd order, dual 4th order or 8th order filters can be designed with an LTC1068 family product. Designing filters with an LTC1068 product is fully supported by FilterCAD filter design software for Windows.

The LTC1068 products are available in a 28-pin SSOP surface mount package. A customized version of an LTC1068 family product can be obtained in a 16-lead SO package with internal thin-film resistors. Please contact LTC Marketing for details.


  • Lowpass or Highpass Filters:
    • LTC1068-200, 0.5Hz to 25kHz;
    • LTC1068, 1Hz to 50kHz;
    • LTC1068-50, 2Hz to 50kHz;
    • LTC1068-25, 4Hz to 200kHz
  • Bandpass or Bandreject (Notch) Filters:
    • LTC1068-200, 0.5Hz to 15kHz;
    • LTC1068, 1Hz to 30kHz;
    • LTC1068-50, 2Hz to 30kHz;
    • LTC1068-25, 4Hz to 140kHz

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (4)

Tools & Simulations


LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.


Models for the following parts are available in LTspice:


Product Recommendations

LTC1068 Companion Parts

Recommended Suggested Oscillator

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

PCN-PDN Information

Sample & Buy

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Price Table Help


Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.