MCP6284-E/SN Microchip Technology, MCP6284-E/SN Datasheet - Page 15

• Manufacturer Part Number: MCP6284-E/SN
• Description: 450 uA, 5 MHz Rail-to-Rail Op Amp
• Manufacturer: Microchip Technology

3.8.3.8
The low-pass filter shown in Figure 3-17 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 R
fier bandwidth varies greatly over temperature and
process. However, this configuration provides a low-
cost solution for applications with high bandwidth.
FIGURE 3-17:
Low-Pass Filter with Chip Select Circuit.
 2004 Microchip Technology Inc.
V
V
REF
IN
R
2
Capacitorless Second-Order
Low-Pass filter with Chip Select
A
MCP6285
Capacitorless Second-Order
R
3
CS
3
). Note that the ampli-
R
1
B
V
OUT
4.0
Microchip provides the basic design tools needed for
the MCP6281/2/3/4/5 family of op amps.
4.1
The latest version of the 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
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.
4.2
Microchip’s FilterLab software is an innovative tool that
simplifies analog active-filter (using op amps) design.
Available
www.microchip.com, the FilterLab active-filter software
design tool provides full schematic diagrams of the filter
circuit with component values. It also outputs the filter
circuit in SPICE format, which can be used with the
macro model to simulate actual filter performance.
DESIGN TOOLS
SPICE Macro Model
FilterLab
MCP6281/2/3/4/5
at
no
®
cost
Software
from
our
DS21811C-page 15
web
site
at