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MCP6H01 데이터시트(PDF) 20 Page - Microchip Technology

부품명 MCP6H01
상세설명  1.2 MHz, 16V Op Amps Input Offset Voltage: 짹0.7 mV (typical)
PDF  40 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP6H01 데이터시트(HTML) 20 Page - Microchip Technology

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MCP6H01/2/4
DS22243C-page 20
© 2011 Microchip Technology Inc.
4.7.2
TWO OP AMP INSTRUMENTATION
AMPLIFIER
The MCP6H01/2/4 op amps are well suited for
conditioning
sensor
signals
in
battery-powered
applications.
Figure 4-9
shows
a
two
op
amp
instrumentation amplifier using the MCP6H02, which
works well for applications requiring rejection of
common mode noise at higher gains.
To ensure proper operation, the op amp common mode
input voltage must be kept within the allowed range.
The reference voltage (VREF) is supplied by a low-
impedance source. In single-supply applications, VREF
is typically VDD/2.
FIGURE 4-9:
Two Op Amp
Instrumentation Amplifier.
To obtain the best CMRR possible, and not limit the
performance by the resistor tolerances, set a high gain
with the RG resistor.
4.7.3
PHOTODETECTOR AMPLIFIER
The MCP6H01/2/4 op amps can be used to easily
convert the signal from a sensor that produces an
output current (such as a photo diode) into voltage (a
trans-impedance amplifier). This is implemented with a
single resistor (R2) in the feedback loop of the
amplifiers shown in Figure 4-10. The optional capacitor
(C2) sometimes provides stability for these circuits.
A photodiode configured in Photovoltaic mode has a
zero voltage potential placed across it. In this mode,
the light sensitivity and linearity is maximized, making it
best suited for precision applications. The key amplifier
specifications for this application are: low input bias
current, common mode input voltage range (including
ground), and rail-to-rail output.
FIGURE 4-10:
Photodetector Amplifier.
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
½
MCP6H02
½
MCP6H02
D1
Light
VOUT
VDD
R2
C2
ID1
VOUT = ID1*R2
–
+
MCP6H01



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