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User Module Datasheet: Four-Pole Low-pass Filter Datasheet, LPF4V 2.10 (CY8C29/28/24XXX, CY8C27X43) | Cypress Semiconductor

User Module Datasheet: Four-Pole Low-pass Filter Datasheet, LPF4V 2.10 (CY8C29/28/24XXX, CY8C27X43)

Last Updated: 
Dec 15, 2014
Version: 
2.10

Features and Overview

  • User-programmable corner frequency and damping ratio
  • Corner frequency 50 Hz to 150 kHz
  • Automated design for Bessel, Butterworth, and Chebychev filters
  • User-selected over-sample 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 LPF4 User Module uses four switched-capacitor blocks to implement a general-purpose fourth 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. Select 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.