MCP6L1RT datasheet(13/32 Pages) MICROCHIP

部件名	MCP6L1RT

功能描述	2.8 MHz, 200 關A Op Amps

PDF	32 Pages

Scroll/Zoom	100%

制造商	MICROCHIP [Microchip Technology]

网页	http://www.microchip.com

标志

13 / 32 page

DS22135A-page 13

MCP6L1/1R/2/4

4.7

Application Circuits

4.7.1

ACTIVE LOW-PASS FILTER

Figure 4-6 shows a second-order Butterworth filter,

with a 10 Hz cutoff frequency and a gain of +1 V/V,

using a Sallen Key topology. Microchip’s FilterLab®

software designed the filter, then the capacitors were

reduced in value (using the same program).

FIGURE 4-6:

Sallen Key Topology.

Figure 4-7 shows a filter with the same requirements,

except the gain is -1 V/V, in a Multiple Feedback topol-

ogy. It was designed in a similar fashion using Filter-

Lab®.

FIGURE 4-7:

Multiple Feedback Topology.

VIN

VOUT

18.2 k

Ω 29.4 kΩ

MCP6L1

470 nF

1.0 µF

VIN

VOUT

54.9 k

25.5 k

MCP6L1

820 nF

220 nF

VDD/2

25.5 k

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