MCP6291-E/SL Microchip Technology, MCP6291-E/SL Datasheet - Page 15

• Manufacturer Part Number: MCP6291-E/SL
• Description: 1.0 mA, 10 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. It uses only three external
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
amplifier 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
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
Capacitorless Second-Order
MCP6295
are used to set the circuit gain
R
3
CS
R
3
1
B
). Note that the
V
OUT
4.0
Microchip provides the basic design tools needed for
the MCP6291/2/3/4/5 family of op amps.
4.1
The latest version of SPICE Macro Model for the
MCP6291/2/3/4/5 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
MCP6291/2/3/4/5
at
no
®
cost
Software
from
our
DS21812C-page 15
web
site
at