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參數(shù)資料
| 型號： | MCP6033T |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 0.9 uA, High Precision Op Amps |
| 中文描述： | 0.9微安，高精度運算放大器 |
| 文件頁數(shù)： | 14/30頁 |
| 文件大小： | 870K |
| 代理商： | MCP6033T |
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MCP6031/2/3/4
DS22041A-page 14
2007 Microchip Technology Inc.
4.0
APPLICATION INFORMATION
The MCP6031/2/3/4 family of op amps is manufactured
using Microchip’s state-of-the-art CMOS process and
is specifically designed for low-power, high precision
applications.
4.1
Rail-to-Rail Input
4.1.1
PHASE REVERASAL
The MCP6031/2/3/4 op amps are designed to prevent
phase reversal when the input pins exceed the supply
voltages.
Figure 2-32
shows the input voltage exceed-
ing the supply voltage without any phase reversal.
4.1.2
INPUT VOLTAGE AND CURRENT
LIMITS
The ESD protection on the inputs can be depicted as
shown in
Figure 4-1
. This structure was chosen to
protect the input transistors and to minimize input bias
current (I
B
). The input ESD diodes clamp the inputs
when they try to go more than one diode drop below
V
SS
. They also clamp any voltage that go too far above
V
DD
; their breakdown voltage is high enough to allow
normal operation and low enough to bypass ESD
events within the specified limits.
FIGURE 4-1:
Structures.
Simplified Analog Input ESD
In order to prevent damage and/or improper operation
of these op amps, the circuit they are in must limit the
voltages and currents at the V
IN+
and V
IN-
pins (see
Absolute Maximum Ratings
at the beginning of
Section 1.0 “Electrical Characteristics”
).
Figure 4-2
shows the recommended approach to protecting these
inputs. The internal ESD diodes prevent the input pins
(V
IN+
and V
IN-
) from going too far below ground, and
the resistors R
1
and R
2
limit the possible current drawn
out of the input pins. Diodes D
1
and D
2
prevent the
input pins (V
IN+
and V
IN-
) from going too far above V
DD
.
When implemented as shown, resistors R
1
and R
2
also
limit the current through D
1
and D
2
.
FIGURE 4-2:
Inputs.
Protecting the Analog
It is also possible to connect the diodes to the left of the
resistors R
1
and R
2
. In this case, the currents through
the diodes D
1
and D
2
need to be limited by some other
mechanism. The resistors then serve as in-rush current
limiters; the DC currents into the input pins (V
IN+
and
V
IN-
) should be very small. A significant amount of
current can flow out of the inputs when the common
mode voltage (V
CM
) is below ground (V
SS
).
4.1.3
NORMAL OPERATION
The input stage of the MCP6031/2/3/4 op amps uses
two differential input stages in parallel. One operates at
a low common mode input voltage (V
CM
), while the
other operates at a high V
CM
. With this topology, the
device operates with a V
CM
up to 300 mV above V
DD
and 300 mV below V
SS
. The input offset voltage is
measured at V
CM
= V
SS
– 0.3V and V
DD
+ 0.3V to
ensure proper operation.
Bond
Pad
Bond
Pad
Bond
Pad
V
DD
V
IN
+
V
SS
Input
Stage
Bond
Pad
V
IN
–
V
1
MCP603X
R
1
V
DD
D
1
R
1
>V
SS
– (minimum expected V
1
)
2 mA
R
2
>V
SS
– (minimum expected V
2
)
2 mA
V
2
R
2
D
2
R
3
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