MCP6271-ESLASHST datasheet(18/36 Pages) MICROCHIP

18 / 36 page

MCP6271/1R/2/3/4/5

DS21810F-page 18

4.9.3.5

Second Order MFB with an Extra

Pole-Zero Pair

Figure 4-14 is a second order multiple feedback low-

pass filter with Chip Select. Use the FilterLab® software

from Microchip Technology Inc. to determine the R and

C values for op amp A’s second order filter. Op amp B

can be used to add a pole-zero pair using C3, R6 and

R7.

FIGURE 4-14:

Second Order Multiple

Feedback Low-Pass Filter with an Extra Pole-

Zero Pair.

4.9.3.6

Second Order Sallen-Key with an

Extra Pole-Zero Pair

Figure 4-15 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

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 4-15:

Second Order Sallen-Key

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

Chip Select.

4.9.3.7

Capacitorless Second Order

Low-Pass filter with Chip Select

The low-pass filter shown in Figure 4-16 does not

require external capacitors and uses only three

external resistors; the op amp’s GBWP sets the corner

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

bandwidth

varies

greatly

over

temperature

and

process. This configuration, however, provides a low

cost solution for applications with high bandwidth

requirements.

FIGURE 4-16:

Capacitorless Second Order

Low-Pass Filter with Chip Select.

VOUT

MCP6275

VDD

VIN

VOUT

MCP6275

VIN

VOUT

MCP6275

VREF

VIN

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