MCP6141 N/A, MCP6141 Datasheet - Page 10

• Manufacturer Part Number: MCP6141
• Description: MCP6141-2-3-4
• Manufacturer: N/A

MCP6141/2/3/4
3.0
The MCP6141/2/3/4 family of operational amplifiers
are fabricated on Microchip’s state-of-the-art CMOS
process. They are stable for noise gain of 10 V/V or
higher. Microchip also produces a unity gain stable
product, the MCP6041/2/3/4 family, which has similar
specifications. The MCP6041/2/3/4 family has a band-
width of 1.4 kHz at a noise gain of 10 V/V, while the
MCP6141/2/3/4 family has a bandwidth of 10 kHz at a
noise gain of 10 V/V. These devices are suitable for a
wide range of applications requiring very low power
consumption. With these op amps, the power supply
pin needs to be bypassed with a 0.1 µF capacitor.
3.1
The input stage of these devices uses two differential
input stages in parallel; one operates at low V
mon mode input voltage) and the other at high V
With this topology, the MCP6141/2/3/4 family operates
with V
Offset Voltage is measured at both V
and V
3.2
The MCP6141/2/3/4 op amp family has low quiescent
current, which supports battery-powered applications.
There is minimal quiescent current glitch when chip
select (CS) is raised or lowered. This prevents exces-
sive current draw and reduced battery life when the
part is turned off or on.
Heavy resistive loads at the output can cause exces-
sive battery drain. Driving a DC voltage of 2.5V across
a 100 k
increase by 25 µA, depleting the battery 43 times as
fast as I
High frequency signals (fast edge rate) across capaci-
tive loads will also significantly increase supply current.
For instance, a 0.1 µF capacitor at the output presents
an AC impedance of 15.9 k
sinewave. It can be shown that the average power
drawn from the battery by a 5.0 V
(1.77 Vrms) under these conditions is:
EQUATION
This will drain the battery 18 times as fast as I
21668A-page 10
P
SUPPLY
DD
CM
Q
APPLICATIONS INFORMATION
Rail-to-Rail Input
Output Loads and Battery Life
+ 0.3V to ensure proper operation.
up to 300 mV past either supply rail. The Input
load resistor will cause the supply current to
(0.6 µA typ) alone.
=
=
=
3.0 W
V
5V 0.6 A
DD
–
+
V
SS
50 W
+
I
Q
5.0V
+
V
L p p
p p
(1/2 fC) to a 100 Hz
–
–
100Hz 0.1 F
CM
fC
p-p
L
= V
sinewave
CM
SS
Q
alone.
- 0.3V
(com-
CM
.
3.3
The MCP6141/2/3/4 family Maximum Output Voltage
Swing defines the maximum swing possible under a
particular output load. According to the specification
table, the output can reach up to 10 mV of either supply
rail with a 50 k load.
3.4
The MCP6141/2/3/4 op amp family uses CMOS tran-
sistors at the input. It is designed to prevent phase
reversal when the input pins exceed the supply volt-
ages. Figure 2-33 shows an input voltage exceeding
both supplies without output phase reversal.
The maximum operating V
inputs is V
input that exceeds this absolute maximum rating can
cause excessive current to flow in or out of the input
pins. Current beyond ±2 mA can cause possible reli-
ability problems. Applications that exceed this rating
must be externally limited with an input resistor, as
shown in Figure 3-1.
FIGURE 3-1:
should be used to limit excessive input current if
the inputs exceed the absolute maximum
specification.
3.5
The MCP6141/2/3/4 op amp family is designed to give
high bandwidth and faster slew rate for circuits with
high noise (G
stable MCP6041/2/3/4 op amp family has lower AC
performance, but it is preferable for low noise gain
applications.
Noise gain is defined to be the gain from a voltage
source at the non-inverting input to the output when all
other voltage sources are zeroed (shorted out). Noise
gain is independent of signal gain and depends only on
components in the feedback loop.
V
IN
Rail-to-Rail Output
Input Voltage and Phase Reversal
Stability
R
R
IN
SS
IN
n
-0.3V and V
------------------------------------------------------------------------------ -
) or signal gain. The related unity-gain
R
V
--------------------------------------------------------------------------- -
Maximum expected V
IN
SS
–
Minimum expected V
An input resistor, R
MCP614X
2002 Microchip Technology Inc.
CM
DD
2 mA
2 mA
that can be applied to the
+ 0.3V. Voltage on the
IN
–
V
IN
DD
IN
V
,
OUT