MCP6142T-I/MS Microchip Technology, MCP6142T-I/MS Datasheet - Page 19

• Manufacturer Part Number: MCP6142T-I/MS
• Description: IC OPAMP 1.4V DUAL R-R 8-MSOP
• Manufacturer: Microchip Technology

Specifications of MCP6142T-I/MS

• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Output Type: Rail-to-Rail
• Slew Rate: 0.003 V/µs
• Gain Bandwidth Product: 100kHz
• 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
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -

4.9
4.9.1
The MCP6141/2/3/4 op amps’ Common Mode Input
Range, which goes 0.3V beyond both supply rails,
supports their use in high side and low side battery
current sensing applications. The very low quiescent
current (0.6 µA, typical) help prolong battery life, and
the rail-to-rail output supports detection low currents.
Figure 4-10
circuit. The 1 kΩ resistor is sized to minimize power
losses. The battery current (I
resistor causes its top terminal to be more negative
than the bottom terminal. This keeps the common
mode input voltage of the op amp below V
within its allowed range. When no current is flowing, the
output will be at its Maximum Output Voltage Swing
(V
FIGURE 4-10:
Sensor.
© 2009 Microchip Technology Inc.
.
1.4V
6.0V
OH
to
), which is virtually at V
Application Circuits
V
OUT
I
BATTERY CURRENT SENSING
DD
shows a high side battery current sensor
100 kΩ
=
1 kΩ
V
DD
High Side Battery Current
–
(
1 kΩ
MCP6141
DD
.
) 11 V/V
1 MΩ
DD
(
) through the 1 kΩ
)I
DD
DD
, which is
V
V
DD
OUT
4.9.2
The MCP6141/2/3/4 op amp is well suited for the
inverting summing amplifier shown in
the resistors at the input (R
noise gain at least 10 V/V. The output voltage (V
a weighted sum of the inputs (V
shifted by the V
follow in
FIGURE 4-11:
EQUATION 4-3:
.
Noise Gain:
Signal Gains:
Output Signal:
V
V
V
1
2
3
G
G
G
G
V
Equation
OUT
N
1
2
3
V
INVERTING SUMMING AMPLIFIER
=
=
=
=
REF
R
R
R
–
–
–
=
1
R
R
R
MCP6141/2/3/4
REF
1
2
3
+
F
F
F
V
4-3.
R
1
⁄
⁄
⁄
G
R
R
R
F
input. The necessary calculations
1
2
3
⎛
⎝
1
----- -
R
Summing Amplifier.
+
1
MCP614X
1
V
+
2
----- -
R
G
R
1
1
2
2
F
, R
+
+
1
----- -
R
V
2
1
, V
3
, and R
3
⎞
⎠
G
DS21668D-page 19
2
≥
3
Figure 4-11
, and V
10 V/V
+
V
REF
3
V
) make the
OUT
3
G
), and is
N
OUT
when
) is