MCP6272 Microchip Technology Inc., MCP6272 Datasheet - Page 17

• Manufacturer Part Number: MCP6272
• Description: 170 ?a, 2 Mhz Rail-to-rail Op Am
• Manufacturer: Microchip Technology Inc.

4.9.3.5
Figure 4-14
pass filter with Chip Select. Use the FilterLab
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 C
R
FIGURE 4-14:
Feedback Low-Pass Filter with an Extra Pole-
Zero Pair.
4.9.3.6
Figure 4-15
filter with Chip Select. Use the Filterlab
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 C
FIGURE 4-15:
Low-Pass Filter with an Extra Pole-Zero Pair and
Chip Select.
© 2006 Microchip Technology Inc.
V
7
V
.
IN
IN
R
4
V
R
DD
3
is a second order multiple feedback low-
is a second order Sallen-Key low-pass
C
Second Order MFB with an Extra
Pole-Zero Pair
Second Order Sallen-Key with an
Extra Pole-Zero Pair
R
R
2
2
R
3
R
R
5
2
4
C
1
R
A
Second Order Multiple
Second Order Sallen-Key
1
R
C
A
1
1
MCP6275
R
MCP6275
3
6
R
, R
CS
5
CS
5
and R
C
R
B
®
3
7
C
B
R
software from
3
6
6
.
®
3
software
, R
V
V
6
OUT
OUT
and
4.9.3.7
The low-pass filter shown in
require external capacitors and uses only three
external resistors; the op amp’s GBWP sets the corner
frequency. R
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
bandwidth varies greatly over temperature and
process. This configuration, however, provides a low
cost solution for applications with high bandwidth
requirements.
FIGURE 4-16:
Low-Pass Filter with Chip Select.
MCP6271/1R/2/3/4/5
V
V
IN
REF
R
1
2
Capacitorless Second Order
Low-Pass filter with Chip Select
and R
2
A
are used to set the circuit gain. R
Capacitorless Second Order
MCP6275
R
3
3
CS
). Note that the amplifier
Figure 4-16
R
B
1
DS21810E-page 17
V
does not
OUT
3