Digitally Tunable MDAC Based State Variable Filter Reference Design TIPD160 (ACTIVE)

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Key Document


This MDAC based state variable filter offers highly accurate digital tuning of gain, center/cut off frequency, and quality factor. This circuit provides three separate filter outputs: low pass, band pass, and high pass that can be accessed simultaneously.  This circuit is suitable for a broad range of applications requiring accurate digital filter tuning from audio to industrial and more!

  • Contains Theory, Component Selection, TINA-TI Simulation, Measured Results, PCB Layout, Modifications
  • Digitally tunable high, band, or low pass filter
    • Gain range -53.13 dB to 6.01 dB
    • Frequency range 1.99 Hz to 28.76 kHz
    • Quality factor range 0.46 to 2.14

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Schematic/Block Diagram

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Design Files

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TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
DAC8812  16-Bit, Dual Serial Input Multiplying Digital-to-Analog Converter  Digital-to-analog converters (DACs)  Sample & Buy Not Available
OPA277  High Precision Operational Amplifiers  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
DAC8812 Download Download
OPA277 Download -
Download Download
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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 2073 19 Sep 2014
Design files (3)
Title Type Size (KB) Date
ZIP 1823 16 Oct 2014
PDF 185 16 Oct 2014
PDF 193 16 Oct 2014
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