MCP6H02 MICROCHIP [Microchip Technology], MCP6H02 Datasheet - Page 20

• Manufacturer Part Number: MCP6H02
• Manufacturer: MICROCHIP [Microchip Technology]

MCP6H01/2/4
4.7.2
The MCP6H01/2/4 op amps are well suited for
conditioning
applications.
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 (V
impedance source. In single-supply applications, V
is typically V
FIGURE 4-9:
Instrumentation Amplifier.
To obtain the best CMRR possible, and not limit the
performance by the resistor tolerances, set a high gain
with the R
DS22243C-page 20
V
V
V
REF
2
1
V
OUT
R
G
1
TWO OP AMP INSTRUMENTATION
AMPLIFIER
resistor.
DD
=
sensor
Figure 4-9
/2.
(
V
MCP6H02
1
R
–
2
V
½
2
Two Op Amp
R
) 1
signals
⎛
⎝
G
REF
+
shows a two op amp
R
R
----- -
R
) is supplied by a low-
2
1
2
+
in
2R
-------- -
R
G
1
MCP6H02
⎞
⎠
battery-powered
R
+
1
V
½
REF
V
OUT
REF
4.7.3
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 (R
amplifiers shown in
(C
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:
Light
2
) sometimes provides stability for these circuits.
I
D1
PHOTODETECTOR AMPLIFIER
D
2
Figure
) in the feedback loop of the
1
Photodetector Amplifier.
© 2011 Microchip Technology Inc.
MCP6H01
–
+
C
R
4-10. The optional capacitor
2
2
V
DD
V
OUT
V
= I
OUT
D1
*R
2