MCP6232-E/SNG Microchip Technology, MCP6232-E/SNG Datasheet - Page 10

• Manufacturer Part Number: MCP6232-E/SNG
• Description: 1.8V, 200KHz DUAL LOW-COST CMOS OPERATIONAL AMPLIFIER, -40C to +125C, 8-SOIC 150mil, TUBE
• Manufacturer: Microchip Technology

MCP6231/1R/1U/2/4
4.0
The MCP6231/1R/1U/2/4 family of op amps is manu-
factured using Microchip’s state-of-the-art CMOS pro-
cess and is specifically designed for low-cost, low-
power and general-purpose applications. The low sup-
ply voltage, low quiescent current and wide bandwidth
makes the MCP6231/1R/1U/2/4 ideal for battery-pow-
ered applications.
4.1
4.1.1
The MCP6231/1R/1U/2/4 op amp is designed to
prevent phase reversal when the input pins exceed the
supply voltages.
exceeding the supply voltage without any phase
reversal.
FIGURE 4-1:
Show No Phase Reversal.
4.1.2
The ESD protection on the inputs can be depicted as
shown in
protect the input transistors, and to minimize input bias
current (I
when they try to go more than one diode drop below
V
above V
allow normal operation, and low enough to bypass
quick ESD events within the specified limits.
DS21881D-page 10
SS
. They also clamp any voltages that go too far
-1.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
DD
APPLICATION INFORMATION
Rail-to-Rail Inputs
B
). The input ESD diodes clamp the inputs
Figure
; their breakdown voltage is high enough to
PHASE REVERSAL
INPUT VOLTAGE AND CURRENT
LIMITS
Figure 4-1
4-2. This structure was chosen to
The
V
Time (1 ms/div)
IN
MCP6231/1R/1U/2/4
shows the input voltage
V
OUT
V
G = +2 V/V
DD
= 5.0V
FIGURE 4-2:
Structures.
In order to prevent damage and/or improper operation
of these op amps, the circuit they are in must limit the
currents and voltages at the V
Absolute Maximum Ratings † at the beginning of
Section 1.0 “Electrical Characteristics”).
shows the recommended approach to protecting these
inputs. The internal ESD diodes prevent the input pins
(V
the resistors R
out of the input pins. Diodes D
input pins (V
V
implemented as shown, resistors R
the current through D
FIGURE 4-3:
Inputs.
It is also possible to connect the diodes to the left of
resistors R
diodes D
mechanism. The resistors then serve as in-rush current
limiters; the DC current into the input pins (V
V
DD
IN
IN
V
V
–) should be very small.
+ and V
1
2
, and dump any currents onto V
V
V
V
IN
DD
SS
+
1
R
R
R
R
1
2
1
and D
Bond
Bond
Bond
Pad
Pad
Pad
IN
1
2
D
>
>
and R
IN
–) from going too far below ground, and
1
1
V
V
+ and V
and R
SS
SS
2
D
2
needs to be limited by some other
– (minimum expected V
– (minimum expected V
2
. In this case, current through the
1
2
Simplified Analog Input ESD
Protecting the Analog
and D
limit the possible current drawn
IN
© 2008 Microchip Technology Inc.
Stage
Input
–) from going too far above
MCP623X
2 mA
2 mA
2
.
V
R
IN
DD
1
3
+ and V
and D
1
and R
Bond
Pad
2
IN
prevent the
– pins (see
1
2
DD
2
Figure 4-3
)
)
V
also limit
. When
IN
IN
–
+ and