MCP6XXXDM-FLTR Microchip Technology, MCP6XXXDM-FLTR Datasheet - Page 23

• Manufacturer Part Number: MCP6XXXDM-FLTR
• Description: KIT DEMO BOARD ACTIVE FILTER
• Manufacturer: Microchip Technology

Specifications of MCP6XXXDM-FLTR

• Main Purpose: Filters, Active - Bandpass, Highpass, Lowpass
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: MCP6271
• Primary Attributes: Cascadable PCBs, Single Supply
• Secondary Attributes: Bessel, Butterworth, and Chebyshev, with Order 1 ~ 8
• Processor To Be Evaluated: MCP6271
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Not applicable / Not applicable

3.1
3.2
© 2006 Microchip Technology Inc.
INTRODUCTION
THE FILTER DESIGN
Chapter 3. Building the Filter Supplied in the Kit
The accessory bag that comes with this kit makes it quick and easy to evaluate the filter
described below; it was designed in FilterLab V2.0. Items discussed in this chapter
include:
• The Filter Design
• Putting the Filter Together
• Testing the Filter
See Figure 3-1 for the circuit diagram supported by the accessory bag. This filter is
described as follows:
• Bessel Low-pass
• n = 5, (filter order)
• f
• Gain = 1 V/V
• Sallen-Key sections
• Single Supply
FIGURE 3-1:
Demo Board Kit.
This filter was built, and its frequency response was measured; the result is shown in
Figure 3-2. MCP601 op amps were used, instead of MCP6271 op amps, because they
are slower. Notice how close the measured and simulated data are; this happened
because the MCP601 op amp is much faster than the filter, and because 1% resistors
and 5% capacitors were used.
V
IN
C
= 100 Hz, (cut-off frequency)
10.7k
0.10µ
R11
C11
SK-LP1
U
MCP6271
ACTIVE FILTER DEMO BOARD KIT
1
5th Order, Bessel, Low-pass Filter Supported by the Active Filter
3.16k
R21
0.39µ
6.81k
0.10µ
C21
R22
C22
SK-LP2
U
MCP6271
2
5.62k
R31
USER’S GUIDE
0.15µ
12.7k
0.10µ
C31
R32
C32
SK-LP2
U
MCP6271
DS51614A-page 19
3
V
OUT