2009 Microchip Technology Inc.
DS21733J-page 13
MCP6001/1R/1U/2/4
4.0
APPLICATION INFORMATION
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
Rail-to-Rail Inputs
4.1.1
PHASE REVERSAL
The MCP6001/1R/1U/2/4 op amp is designed to
prevent phase reversal when the input pins exceed the
exceeding 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
protect the input transistors, and to minimize input bias
current (IB). The input ESD diodes clamp the inputs
when they try to go more than one diode drop below
VSS. They also clamp any voltages that go too far
above VDD; their breakdown voltage is high enough to
allow normal operation, and low enough to bypass
quick ESD events within the specified limits.
FIGURE 4-1:
Simplified Analog Input ESD
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 VIN+ and VIN– pins (see
shows the recommended approach to protecting these
inputs. The internal ESD diodes prevent the input pins
(VIN+ and VIN–) from going too far below ground, and
the resistors R1 and R2 limit the possible current drawn
out of the input pins. Diodes D1 and D2 prevent the
input pins (VIN+ and VIN–) from going too far above
VDD, and dump any currents onto VDD. When
implemented as shown, resistors R1 and R2 also limit
the current through D1 and D2.
FIGURE 4-2:
Protecting the Analog
Inputs.
It is also possible to connect the diodes to the left of
resistors R1 and R2. In this case, current through the
diodes D1 and D2 needs to be limited by some other
mechanism. The resistors then serve as in-rush current
limiters; the DC current into the input pins (VIN+ and
VIN–) should be very small.
A significant amount of current can flow out of the
inputs when the common mode voltage (VCM) is below
high impedance may need to limit the usable voltage
range.
4.1.3
NORMAL OPERATION
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 (VCM),
while the other operates at high VCM. WIth this
topology, the device operates with VCM up to 0.3V
above VDD and 0.3V below VSS.
The transition between the two input stages occurs
when VCM = VDD – 1.1V. For the best distortion and
gain linearity, with non-inverting gains, avoid this region
of operation.
4.2
Rail-to-Rail Output
The output voltage range of the MCP6001/2/4 op amps
is
VDD – 25 mV
(minimum)
and
VSS +25mV
(maximum) when RL =10kΩ is connected to VDD/2
information.
Bond
Pad
Bond
Pad
Bond
Pad
VDD
VIN+
VSS
Input
Stage
Bond
Pad
VIN–
V1
MCP600X
R1
VDD
D1
R1 >
VSS – (minimum expected V1)
2mA
R2 >
VSS – (minimum expected V2)
2mA
V2
R2
D2
R3