MCP607-I/PG Microchip Technology, MCP607-I/PG Datasheet - Page 12

• Manufacturer Part Number: MCP607-I/PG
• Description: DUAL 25 UA, 2.5V OP AMP, -40C to +85C, 8-PDIP, TUBE
• Manufacturer: Microchip Technology

MCP606/7/8/9
4.0
The MCP606/7/8/9 family of op amps is manufactured
using Microchip’s state-of-the-art CMOS process
These op amps are unity-gain stable and suitable for a
wide range of general purpose applications.
4.1
4.1.1
The MCP606/7/8/9 op amp is designed to prevent
phase reversal when the input pins exceed the supply
voltages.
ing 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
V
implemented as shown, resistors R
the current through D
DS11177E-page 12
SS
DD
IN
. They also clamp any voltages that go too far
+ and V
, and dump any currents onto V
V
V
V
IN
DD
SS
+
DD
APPLICATIONS INFORMATION
Rail-to-Rail Inputs
B
Figure 2-23
). 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
4-1. This structure was chosen to
1
shows the input voltage exceed-
2
Simplified Analog Input ESD
and D
limit the possible current drawn
IN
Stage
Input
–) from going too far above
2
.
IN
1
+ and V
and D
1
and R
Bond
Pad
2
IN
prevent the
– pins (see
DD
2
Figure 4-2
V
also limit
. When
IN
–
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 useable voltage
range.
4.1.3
The input stage of the MCP606/7/8/9 op amps use a
PMOS input stage. It operates at low common mode
input voltage (V
topology, the device operates with V
and 0.3V below V
Figure 4-3
same voltage as the inverting input, V
below V
FIGURE 4-3:
Limited V
IN
V
V
–) should be very small.
1
2
DD
1
R
R
V
SS
OUT
R
R
–1.2V for correct operation.
shows a unity gain buffer. Since V
1
2
1
and D
IN
NORMAL OPERATION
1
2
D
>
>
); see
and R
1
V
V
Range.
SS
SS
2
SS
CM
D
2
needs to be limited by some other
– (minimum expected V
– (minimum expected V
.
+
–
Figure
2
. In this case, current through the
MCP60X
), including ground. WIth this
Protecting the Analog
Unity Gain Buffer has a
© 2008 Microchip Technology Inc.
2-31. Applications that are
MCP60X
2 mA
2 mA
V
R
DD
3
CM
OUT
up to V
V
OUT
must be kept
CM
1
2
)
)
OUT
) is below
DD
IN
+ and
–1.1V
is the