MCP6H02 MICROCHIP [Microchip Technology], MCP6H02 Datasheet - Page 17

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

4.0
The MCP6H01/2/4 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
4.1.1
The MCP6H01/2/4 op amps are designed to prevent
phase reversal when the input pins exceed the supply
voltages.
exceeding the supply voltage without any phase
reversal.
4.1.2
In order to prevent damage and/or improper operation
of these amplifiers, the circuit must limit the voltages at
the input pins (see
Ratings
The ESD protection on the inputs can be depicted as
shown in
protect the input transistors against many (but not all)
over-voltage conditions, and to minimize the input bias
current (I
FIGURE 4-1:
Structures.
The input ESD diodes clamp the inputs when they try
to go more than one diode drop below V
clamp any voltages that go well above V
breakdown voltage is high enough to allow normal
operation, but not low enough to protect against slow
over-voltage (beyond V
events (that meet the specification) are limited so that
damage does not occur.
In some applications, it may be necessary to prevent
excessive voltages from reaching the op amp inputs;
Figure 4-2
inputs.
© 2011 Microchip Technology Inc.
V
V
V
IN
DD
SS
+
†”).
APPLICATION INFORMATION
Inputs
B
).
Figure
Figure 2-36
Bond
Bond
Bond
shows one approach to protecting these
PHASE REVERSAL
INPUT VOLTAGE LIMITS
Pad
Pad
Pad
4-1. This structure was chosen to
Section 1.1 “Absolute Maximum
Simplified Analog Input ESD
Stage
Input
DD
shows
) events. Very fast ESD
the
Bond
Pad
input
SS
. They also
V
DD
IN
voltage
; their
–
FIGURE 4-2:
Inputs.
A significant amount of current can flow out of the
inputs when the common mode voltage (V
ground (V
4.1.3
In order to prevent damage and/or improper operation
of these amplifiers, the circuit must limit the currents
into the input pins (see
Maximum Ratings
Figure 4-3
inputs. The resistors R
currents in or out of the input pins (and the ESD diodes,
D
V
FIGURE 4-3:
Inputs.
4.1.4
The inputs of the MCP6H01/2/4 op amps connect to a
differential PMOS input stage. It operates at a low
common mode input voltage (V
With this topology, the device operates with a V
to V
through 2-5). The input offset voltage is measured at
V
operation.
DD
CM
1
and D
V
V
V
V
DD
or V
1
2
= V
1
2
R
R
– 2.3V and 0.3V below V
1
2
SS
SS
2
>
>
SS
). The diode currents will go through either
.
– 0.3V and V
shows one approach to protecting these
R
R
INPUT CURRENT LIMITS
V
V
NORMAL OPERATION
); See
1
2
D
SS
SS
D
1
1
– (minimum expected V
– (minimum expected V
Figure
D
MCP6H01/2/4
D
†”).
2
2
Protecting the Analog
Protecting the Analog
2 mA
2 mA
1
DD
2-38.
and R
MCP6H0X
MCP6H0X
– 2.3V to ensure proper
Section 1.1 “Absolute
V
V
R
CM
SS
DD
DD
3
2
), including ground.
(refer to
limit the possible
DS22243C-page 17
1
2
)
)
CM
Figure 2-3
) is below
V
OUT
V
CM
OUT
up