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x(n) IIR Filter b0 y(n) - a 1 z --11 b 1 z --11 - a 2 b2 Direct From II Realization can implement functions such Bessel, Butterworth, Chebyshev, etc. © 2004 <strong>Microchip</strong> Technology Incorporated. All Rights Reserved. Filter Now, Later, or Never 8
Analog Input Levels Full-scale 0V Digital Filters Using Averaging Delta sigma modulator 1-bit data 1-bit data streams 1/2 full scale input 1/4 full scale input 3/4 full scale input 1 1 1 0 Average 0 Average 1 Average 1 = 0.5 0 = 0.25 1 = 0.75 0 0 0 1 1 1 0 0 1 1 0 1 0 0 0 © 2004 <strong>Microchip</strong> Technology Incorporated. All Rights Reserved. Filter Now, Later, or Never 9
Page 1 and 2: Do I Filter Now, Later, or Never?
Page 3 and 4: When to Pick Analog Over Digital An
Page 5 and 6: Frequency Response 5th order Butter
Page 7: Analog - Butterworth, Chebyshev,
Page 11 and 12: Magnitude 1.5 1 0.5 0 -0.5 -1 -1.5
Page 13 and 14: Gain The Best Design Approach Mux L
Page 15: References Application Notes A

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