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MCP6281-E/MS 数据表(PDF) 16 Page - Microchip Technology

部件名 MCP6281-E/MS
功能描述  450 關A, 5 MHz Rail-to-Rail Op Amp
PDF  36 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

MCP6281-E/MS 数据表(HTML) 16 Page - Microchip Technology

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MCP6281/1R/2/3/4/5
DS21811E-page 16
© 2008 Microchip Technology Inc.
FIGURE 4-11:
Cascaded Gain Circuit
Configuration.
4.9.3.3
Difference Amplifier
Figure 4-12 shows op amp A configured as a difference
amplifier with Chip Select. In this configuration, it is
recommended to use well-matched resistors (e.g.,
0.1%) to increase the Common Mode Rejection Ratio
(CMRR). Op amp B can be used to provide additional
gain and isolate the load from the difference amplifier.
FIGURE 4-12:
Difference Amplifier Circuit.
4.9.3.4
Buffered Non-inverting Integrator
Figure 4-13 shows a lossy non-inverting integrator that
is buffered and has a Chip Select input. Op amp A is
configured as a non-inverting integrator. In this config-
uration, matching the impedance at each input is
recommended. RF is used to provide a feedback loop
at frequencies << 1/(2
πR
1C1) and makes this a lossy
integrator (it has a finite gain at DC). Op amp B is used
to isolate the load from the integrator.
FIGURE 4-13:
Buffered Non-inverting
Integrator with Chip Select.
4.9.3.5
Inverting Integrator with Active
Compensation and Chip Select
Figure 4-14 uses an active compensator (op amp B) to
compensate for the non-ideal op amp characteristics
introduced at higher frequencies. This circuit uses
op amp B as a unity-gain buffer to isolate the integration
capacitor C1 from op amp A and drives the capacitor
with low-impedance source. Since both op amps are
matched very well, they provide a higher quality
integrator.
FIGURE 4-14:
Integrator Circuit with Active
Compensation.
4.9.3.6
Second-Order MFB Low-Pass Filter
with an Extra Pole-Zero Pair
Figure 4-15 is a second-order multiple feedback low-
pass filter with Chip Select. Use the FilterLab® software
from 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 C3, R6, and R7.
A
B
CS
R4
R3
R2
R1
VIN
VOUT
MCP6285
A
B
CS
R2
R1
VIN2
VIN1
R2
R1
VOUT
R4
R3
MCP6285
A
B
CS
RF
C1
R2
C2
R1
VIN
VOUT
MCP6285
R
1C1
R
2
R
F
||
()C
2
=
A
CS
B
VIN
VOUT
R1
C1
MCP6285



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