MCP6281 Microchip Technology, MCP6281 Datasheet - Page 16

• Manufacturer Part Number: MCP6281
• Description: 450 uA, 5 MHz Rail-to-Rail Op Amp
• Manufacturer: Microchip Technology

MCP6281/2/3/4/5
4.8.3.8
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. R
and R
the frequency response, Q needs to be low (lower
values need to be selected for R
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:
Low-Pass Filter with Chip Select.
DS21811D-page 16
V
V
REF
IN
3
R
is used to set the Q. To avoid gain peaking in
2
1
Capacitorless Second-Order
Low-Pass filter with Chip Select
and R
A
2
MCP6285
Capacitorless Second-Order
are used to set the circuit gain
R
3
CS
3
). Note that the ampli-
R
B
1
V
OUT
5.0
Microchip provides the basic design tools needed for
the MCP6281/2/3/4/5 family of op amps.
5.1
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
Microchip’s FilterLab software is an innovative tool that
simplifies analog active-filter (using op amps) design.
Available
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.
latest
DESIGN TOOLS
SPICE Macro Model
FilterLab
at
SPICE
no
®
cost
Software
 2004 Microchip Technology Inc.
macro
from
our
model
web
for
site
the
at