MCP6002 Microchip Technology Inc., MCP6002 Datasheet - Page 9

• Manufacturer Part Number: MCP6002
• Description: 1 Mhz, Low-power Op Amp
• Manufacturer: Microchip Technology Inc.

4.0
The MCP6001/2/4 family of op amps is manufactured
using Microchip’s state-of-the-art CMOS process and
is specifically designed for low-cost, low-power and
general-purpose applications. The low supply voltage,
low quiescent current and wide bandwidth makes the
MCP6001/2/4 ideal for battery-powered applications.
This device has high phase margin, which makes it
stable for larger capacitive load applications.
4.1
4.1.1
The MCP6001/1R/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
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.
FIGURE 4-1:
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
© 2007 Microchip Technology Inc.
SS
IN
. They also clamp any voltages that go too far
+ and V
V
V
V
IN
DD
SS
.
+
DD
APPLICATION INFORMATION
Rail-to-Rail Inputs
B
). The input ESD diodes clamp the inputs
Figure
; their breakdown voltage is high enough to
Bond
Bond
Bond
PHASE REVERSAL
INPUT VOLTAGE AND CURRENT
LIMITS
Pad
Pad
Pad
IN
IN
–) from going too far below ground, and
1
+ and V
and R
Figure 2-21
4-1. This structure was chosen to
2
Simplified Analog Input ESD
limit the possible current drawn
IN
Stage
Input
–) from going too far above
shows the input voltage
IN
1
+ and V
and D
Bond
Pad
2
IN
prevent the
– pins (see
Figure 4-2
V
IN
–
V
implemented as shown, resistors R
the current through D
FIGURE 4-2:
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
A significant amount of current can flow out of the
inputs when the common mode voltage (V
ground (V
high impedance may need to limit the usable voltage
range.
4.1.3
The input stage of the MCP6001/1R/1U/2/4 op amps
use two differential CMOS input stages in parallel. One
operates at low common mode input voltage (V
while the other operates at high V
topology, the device operates with V
above V
The transition between the two input stages occurs
when V
gain linearity, with non-inverting gains, avoid this region
of operation.
4.2
The output voltage range of the MCP6001/2/4 op amps
is V
mum) when R
V
DD
IN
DD
MCP6001/1R/1U/2/4
–) should be very small.
, and dump any currents onto V
DD
= 5.5V. Refer to
V
V
1
2
– 25 mV (minimum) and V
CM
DD
1
Rail-to-Rail Output
SS
1
and D
and 0.3V below V
= V
NORMAL OPERATION
R
R
); see
and R
R
R
1
2
D
1
2
L
>
>
DD
1
= 10 kΩ is connected to V
V
V
2
SS
SS
– 1.1V. For the best distortion and
2
needs to be limited by some other
Figure
. In this case, current through the
D
Figure 2-14
1
– (minimum expected V
– (minimum expected V
2
Protecting the Analog
and D
2-20. Applications that are
2
MCP600X
SS
2 mA
2 mA
.
.
V
for more information.
R
DD
3
SS
1
and R
DS21733G-page 9
+ 25 mV (maxi-
CM
CM
CM
. WIth this
up to 0.3V
DD
2
) is below
DD
also limit
1
2
. When
IN
)
)
/2 and
+ and
CM
),