MCP6281 datasheet(17/36 Pages) MICROCHIP

17 / 36 page

DS21811E-page 17

MCP6281/1R/2/3/4/5

FIGURE 4-15:

Second-Order Multiple

Feedback Low-Pass Filter with an Extra

Pole-Zero Pair.

4.9.3.7

Second-Order Sallen-Key Low-Pass

Filter with an Extra Pole-Zero Pair

Figure 4-16 is a second-order Sallen-Key low-pass

filter with Chip Select. Use the FilterLab® software from

Microchip to determine the R and C values for the op

amp A’s second-order filter. Op amp B can be used to

add a pole-zero pair using C3, R5 and R6.

FIGURE 4-16:

Second-Order Sallen-Key

Low-Pass Filter with an Extra Pole-Zero Pair and

Chip Select.

4.9.3.8

Capacitorless Second-Order

Low-Pass filter with Chip Select

The low-pass filter shown in Figure 4-17 does not

require external capacitors and uses only three exter-

nal resistors; the op amp's GBWP sets the corner

frequency. R1 and R2 are used to set the circuit gain

and R3 is used to set the Q. To avoid gain peaking in

the frequency response, Q needs to be low (lower

values need to be selected for R3). Note that the ampli-

fier bandwidth varies greatly over temperature and

process. However, this configuration provides a low-

cost solution for applications with high bandwidth

requirements.

FIGURE 4-17:

Capacitorless Second-Order

Low-Pass Filter with Chip Select.

VIN

VOUT

MCP6285

VIN

VOUT

MCP6285

VREF

VIN

VOUT

MCP6285

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