MCP6281 datasheet(16/32 Pages) MICROCHIP

16 / 32 page

MCP6281/2/3/4/5

DS21811D-page 16

 2004 Microchip Technology Inc.

4.8.3.8

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 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 4-16:

Capacitorless Second-Order

Low-Pass Filter with Chip Select.

5.0

DESIGN TOOLS

Microchip provides the basic design tools needed for

the MCP6281/2/3/4/5 family of op amps.

5.1

SPICE Macro Model

The

latest

SPICE

macro

model

for

the

MCP6281/2/3/4/5 op amps is available on our web site

at www.microchip.com. This model is intended to be an

initial design tool that works well in the op amp’s linear

region of operation at room temperature. See the

macro model file for information on its capabilities.

Bench testing is a very important part of any design and

cannot be replaced with simulations. Also, simulation

results using this macro model need to be validated by

comparing them to the data sheet specifications and

characteristic curves.

5.2

FilterLab® Software

Microchip’s FilterLab software is an innovative tool that

simplifies analog active-filter (using op amps) design.

Available

cost

from

our

web

site

www.microchip.com, the FilterLab design tool provides

full schematic diagrams of the filter circuit with compo-

nent values. It also outputs the filter circuit in SPICE

format, which can be used with the macro model to

simulate actual filter performance.

VREF

VIN

VOUT

MCP6285

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