MCP6041T-I/OT Microchip Technology, MCP6041T-I/OT Datasheet - Page 11

• Manufacturer Part Number: MCP6041T-I/OT
• Description: IC OPAMP 1UA 1.4V SNGLR-R SOT235
• Manufacturer: Microchip Technology

Specifications of MCP6041T-I/OT

• Slew Rate: 0.003 V/µs
• Package / Case: SOT-23-5, SC-74A, SOT-25
• Amplifier Type: General Purpose
• Number Of Circuits: 1
• Output Type: Rail-to-Rail
• Gain Bandwidth Product: 14kHz
• Current - Input Bias: 1pA
• Voltage - Input Offset: 3000µV
• Current - Supply: 0.6µA
• Current - Output / Channel: 20mA
• Voltage - Supply, Single/dual (±): 1.4 V ~ 6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Number Of Channels: 1
• Common Mode Rejection Ratio (min): 60 dB
• Input Offset Voltage: 3 mV
• Input Bias Current (max): 1 pA
• Operating Supply Voltage: 3 V, 5 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Shutdown: No
• Supply Voltage (max): 6 V
• Supply Voltage (min): 1.4 V
• Technology: CMOS
• Voltage Gain Db: 115 dB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: MCP6041T-I/OT; MCP6041T-I/OTTR

3.0
The MCP6041/2/3/4 family of operational amplifiers
are fabricated on Microchip’s state-of-the-art CMOS
process. They are unity gain stable and suitable for a
wide range of applications requiring very low power
consumption. With these op amps, the power supply
pin needs to be by-passed with a 0.1 µF capacitor.
3.1
The input stage of the family of devices uses two differ-
ential input stages in parallel; one operates at low V
(common mode input voltage) and the other at high
V
operates with V
The Input Offset Voltage is measured at both
V
operation.
3.2
The MCP6041/2/3/4 op amp family has outstanding
quiescent current, which supports battery-powered
applications. There is minimal quiescent current glitch-
ing when chip select (CS) is raised or lowered. This
prevents excessive 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 2.5 V 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 Vp-p sinewave
(1.77 Vrms), under these conditions, is:
EQUATION
This will drain the battery 18 times as fast as I
3.3
The output voltage range of the MCP6041/2/3/4 family
is specified two ways. The first specification, Maximum
Output Voltage Swing, defines the maximum swing
possible under a particular output load. According to
the spec table, the output can reach
supply rail when R
mation on Maximum Output Voltage Swing vs. load
resistance.
CM
CM
P
2002 Microchip Technology Inc.
SUPPLY
. With this topology, the MCP6041/2/3/4 family
= V
Q
SS
APPLICATIONS INFORMATION
Rail to Rail Input
Output Loads and Battery Life
Rail to Rail Output
load resistor will cause the supply current to
(0.6 µA typ) alone.
=
=
=
- 0.3 V and V
3.0 W
5V 0.6 A
V
CM
DD
L
up to 300 mV past either supply rail.
–
= 50 k . See Figure 2-32 for infor-
+
V
50 W
SS
DD
+
I
Q
5.0V
+ 0.3 V to ensure proper
+
V
p p
(1/2 fC) to a 100 Hz
L p p
–
–
100Hz 0.1 F
fC
10 mV of either
L
Q
alone.
CM
The second specification, Linear Region Output Volt-
age Swing, details the output voltage range that sup-
ports the specified Open Loop Gain (A
R
3.4
The MCP6041/2/3/4 op amp family uses CMOS tran-
sistors at the input. It is designed to not exhibit phase
inversion when the input pins exceed the supply volt-
ages. Figure 2-39 shows an input voltage exceeding
both supplies with no resulting phase inversion.
The maximum operating V
voltage) that can be applied to the inputs is V
and V
absolute maximum rating can cause excessive current
to flow in or out of the input pins. Current beyond ±2 mA
can cause possible reliability 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
Driving capacitive loads can cause stability problems
with voltage feedback op amps. A buffer configuration
(G = +1) is the most sensitive to capacitive loads.
Figure 2-27 shows how increasing the load capaci-
tance will decrease the phase margin. While a phase
margin above 60° is ideal, 45° is sufficient. As can be
seen, up to C
MCP6041/2/3/4 op amp outputs without any problems,
while 250 pF is usable with a 45° phase margin.
When the op amp is required to drive large capacitive
loads (C
Figure 3-2) at the output of the amplifier improves the
phase margin. This resistor makes the output load
resistive at higher frequencies, which improves the
phase margin. The bandwidth reduction caused by the
capacitive load, however, is not changed. To select
R
L
ISO
= 50 k ).
V
, start with 1 k , then use the MCP6041 SPICE
DD
IN
L
Input Voltage and Phase Reversal
Capacitive Load and Stability
R
+0.3 V. Voltage on the input that exceed this
R
IN
>150 pF), a small series resistor (R
IN
------------------------------------------------------------------------------ -
R
V
--------------------------------------------------------------------------- -
MCP6041/2/3/4
Maximum expected V
L
IN
SS
= 150 pF can be placed on the
–
Minimum expected V
An input resistor, R
MCP604X
2 mA
2 mA
CM
(common mode input
IN
DS21669B-page 11
OL
–
V
IN
DD
95 dB with
IN
SS
V
,
OUT
-0.3 V
ISO
in