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MCP6421 数据表(PDF) 20 Page - Microchip Technology

部件名 MCP6421
功能描述  4.4 關A, 90 kHz Op Amp
PDF  34 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

MCP6421 数据表(HTML) 20 Page - Microchip Technology

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MCP6421
DS25165A-page 20
 2013 Microchip Technology Inc.
4.7.2
PRESSURE SENSOR AMPLIFIER
The MCP6421 op amp is well suited for conditioning
sensor signals in battery-powered applications. Many
sensors are configured as Wheatstone bridges. Strain
gauges and pressure sensors are two common exam-
ples.
Figure 4-8 shows a strain gauge amplifier, using the
MCP6421 Enhanced EMI protection device. The
difference amplifier with EMI robustness op amp is
used to amplify the signal from the Wheatstone bridge.
The two op amps, configured as buffers and connected
at outputs of pressure sensors, prevents resistive
loading of the bridge by resistor R1 and R2. Resistors
R1,R2 and R3,R5 need to be chosen with very low
tolerance to match the CMRR.
FIGURE 4-8:
Pressure Sensor Amplifier.
4.7.3
BATTERY CURRENT SENSING
The MCP6421 op amp’s Common Mode Input Range,
which goes 0.3V beyond both supply rails, supports
their use in high-side and low-side battery current
sensing applications. The low quiescent current helps
prolong battery life, and the rail-to-rail output supports
detection of low currents.
Figure 4-9 shows a high side battery current sensor
circuit. The 10
 resistor is sized to minimize power
losses. The battery current (IDD) through the 10
resistor causes its top terminal to be more negative
than the bottom terminal. This keeps the Common
mode input voltage of the op amp below VDD, which is
within its allowed range. The output of the op amp will
also be below VDD, within its Maximum Output Voltage
Swing specification.
FIGURE 4-9:
Battery Current Sensing.
VDD
R2
+
-
VOUT
MCP6421
R1
R3
100k
R5
100k
1kŸ
1kŸ
R-¨R
R+¨R
Va
Vb
VDD
+
-
VDD
+
-
MCP6421
MCP6421
R+¨R
R-¨R
VDD
Strain Gauge
V
OUT
V
a
V
b
–
 10k
100
-------------
=
VDD
IDD
100 k
1M
1.8V
VOUT
High-Side Battery Current Sensor
10
to
5.5V
I
DD
V
DD
V
OUT
–
10 V/V
 10

------------------------------------------
=
MCP6421
VDD
VSS



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