MCP6XXXDM-FLTR Microchip Technology, MCP6XXXDM-FLTR Datasheet - Page 26

• 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

DS51614A-page 22
FIGURE 3-5:
FIGURE 3-6:
Using components with tighter tolerances (e.g., 2% capacitors) will improve the
variability of the filter response. This is especially important for filters with a sharp cutoff
characteristic (i.e., Chebyshev).
3.4.3
It is also possible to check op amp overdrive issues by testing the output of all of the
op amps (every Active Filter Section). The worst-case signal(s) needs to be applied at
the first input. Figure 3-7 shows the frequency response of the filter in Figure 3-1. None
of the traces goes above 0 dB, so this filter should not have output voltage range issues
when the input is a sinewave.
Checking Output Headroom
26%
24%
22%
20%
18%
16%
14%
12%
10%
-0.5
-1.0
-1.5
-2.0
-2.5
8%
6%
4%
2%
0%
2.5
2.0
1.5
1.0
0.5
0.0
Gain Error (Monte Carlo simulation) vs. Frequency.
Pass-Band Frequency (Monte Carlo simulation) Histogram.
10
100 MC Sims
1% R's
5% C's
100 MC Sims
1% R's
5% C's
Pass-Band Frequency at -3.01 dB (Hz)
Frequency (Hz)
+3.3 sigma
-3.3 sigma
100
© 2006 Microchip Technology Inc.
1,000