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MCP6401RT-E/SL 데이터시트(PDF) 16 Page - Microchip Technology

부품명 MCP6401RT-E/SL
상세설명  1 MHz, 45 關A Op Amps
PDF  38 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP6401RT-E/SL 데이터시트(HTML) 16 Page - Microchip Technology

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MCP6401/1R/1U/2/4
DS22229B-page 16
© 2010 Microchip Technology Inc.
4.7.2
BATTERY CURRENT SENSING
The MCP6401/1R/1U/2/4 op amps’ 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 (45 µA, typical) 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
Ω resistor is sized to minimize power
losses. The battery current (IDD) through the 10Ω
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, which is within its Maximum Output
Voltage Swing specification.
FIGURE 4-9:
Supply Current Sensing.
4.7.3
INSTRUMENTATION AMPLIFIER
The MCP6401/1R/1U/2/4 op amps are well suited for
conditioning
sensor
signals
in
battery-powered
applications. Figure 4-10 shows a two op amp
instrumentation amplifier, using the MCP6402, that
works well for applications requiring rejection of
Common Mode noise at higher gains. The reference
voltage (VREF) is supplied by a low impedance source.
In single supply applications, VREF is typically VDD/2.
FIGURE 4-10:
Two Op Amp
Instrumentation Amplifier.
VDD
IDD
100 k
Ω
1M
Ω
1.8V
VOUT
10
Ω
to
6.0V
I
DD
V
DD
V
OUT
–
10 V/V
() 10
Ω
()
⋅
------------------------------------------
=
To load
MCP6401
V
OUT
V
1
V
2
–
() 1
R
1
R
2
------
2R
1
R
G
---------
++
⎝⎠
⎛⎞
V
REF
+
=
VREF R1
R2
R2
R1
VOUT
RG
V2
V1
1/2 MCP6402
1/2 MCP6402



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