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User Module Datasheet: Two-Pole Low-Pass Filter Datasheet LPF2 V 4.10 (CY8C29/27/24xxx, CY8C23x33, CY8CLED04/08/16, CY8CLED0xD, CY8CLED0xG, CY8CTMG120, CY8CTMA120, CY8C28x45, CY8CPLC20, CY8CLED16P01, CY8C28x43, CY8C28x52) | Cypress Semiconductor

User Module Datasheet: Two-Pole Low-Pass Filter Datasheet LPF2 V 4.10 (CY8C29/27/24xxx, CY8C23x33, CY8CLED04/08/16, CY8CLED0xD, CY8CLED0xG, CY8CTMG120, CY8CTMA120, CY8C28x45, CY8CPLC20, CY8CLED16P01, CY8C28x43, CY8C28x52)

Last Updated: 
May 31, 2013
Version: 
4.10

Features and Overview

  • User-programmable corner frequency and damping ratio
  • Corner frequency ranging from 20 Hz to 180 kHz
  • Automated design for Bessel, Butterworth, and Chebychev filters
  • User-selected oversample ratio (OSR), ratio of sample frequency to corner frequency
  • Built-in polarity control
  • Built-in modulator for use in full-wave detection and frequency translation

The LPF2 User Module uses two switched-capacitor blocks to implement a general-purpose second order low-pass filter. Corner frequency and damping ratio are functions of the ratios of programmable on-chip capacitors and clock frequency; no external components are required. Selects your filter characteristics and clock frequency; capacitor and clock divider values are automatically calculated in the design tool (wizard). Multiple low-pass filters can be cascaded or combined with band-pass filters to achieve more complex transfer functions.

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