MCP6284 MICROCHIP [Microchip Technology], MCP6284 Datasheet - Page 17

• Manufacturer Part Number: MCP6284
• Description: 450 ?A, 5 MHz Rail-to-Rail Op Amp
• Manufacturer: MICROCHIP [Microchip Technology]

FIGURE 4-15:
Feedback Low-Pass Filter with an Extra
Pole-Zero Pair.
4.9.3.7
Figure 4-16
filter with Chip Select. Use the FilterLab
Microchip to determine the R and C values for the op
amp A’s second-order filter. Op amp B can be used to
add a pole-zero pair using C
FIGURE 4-16:
Low-Pass Filter with an Extra Pole-Zero Pair and
Chip Select.
© 2008 Microchip Technology Inc.
V
V
IN
IN
R
R
C
4
3
2
is a second-order Sallen-Key low-pass
R
R
Second-Order Sallen-Key Low-Pass
Filter with an Extra Pole-Zero Pair
R
3
C
2
R
R
2
1
5
4
R
1
C
Second-Order Multiple
Second-Order Sallen-Key
R
C
2
A
A
1
1
3
, R
MCP6285
MCP6285
5
CS
R
and R
R
CS
6
5
®
6
C
R
software from
.
B
C
B
3
7
R
3
6
V
V
OUT
OUT
4.9.3.8
The low-pass filter shown in
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 4-17:
Low-Pass Filter with Chip Select.
V
MCP6281/1R/2/3/4/5
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
Figure 4-17
3
). Note that the ampli-
R
B
1
DS21811E-page 17
does not
V
OUT