MCP6421
4.4 µA, 90 kHz Op Amp
Features:
• Low Quiescent Current:
- 4.4 µA/amplifier (typical)
• Low Input Offset Voltage:
- ±1.0 mV (maximum)
• Enhanced EMI Protection:
- Electromagnetic Interference Rejection Ratio
(EMIRR) at 1.8 GHz: 97 dB
• Supply Voltage Range: 1.8V to 5.5V
• Gain Bandwidth Product: 90 kHz (typical)
• Rail-to-Rail Input/Output
• Slew Rate: 0.05 V/µs (typical)
• Unity Gain Stable
• No Phase Reversal
• Small Packages:
- Singles in SC70-5, SOT-23-5
• Extended Temperature Range:
- -40°C to +125°C
Description:
The Microchip Technology Inc. MCP6421 family of
operational amplifiers operate with a single supply
voltage as low as 1.8V, while drawing low quiescent
current per amplifier (5.5 µA, maximum). This family
also has low input offset voltage (±1.0 mV, maximum)
and rail-to-rail input and output operation. In addition,
the MCP6421 family is unity gain stable and has a gain
bandwidth product of 90 kHz (typical). This
combination of features supports battery-powered and
portable applications. The MCP6421 family has
enhanced EMI protection to minimize any
electromagnetic interference from external sources,
such as power lines, radio stations, and mobile
communications, etc. This feature makes it well suited
for EMI sensitive applications.
The MCP6421 family is offered in single (MCP6421)
packages. All devices are designed using an advanced
CMOS process and fully specified in extended
temperature range from -40°C to +125°C.
Applications:
•
•
•
•
•
•
Portable Medical Instrument
Safety Monitoring
Battery Powered System
Remote Sensing
Supply Current Sensing
Analog Active Filter
Package Types
MCP6421
SC70-5, SOT-23-5
V
OUT
1
V
SS
2
V
IN
+ 3
4 V
IN
–
5 V
DD
Design Aids:
•
•
•
•
•
SPICE Macro Models
FilterLab
®
Software
Microchip Advanced Part Selector (MAPS)
Analog Demonstration and Evaluation Boards
Application Notes
Typical Application
V
DD
R+¨R
R-¨R
V
DD
+
-
R
3
100k
MCP6421
R
1
1k
R
2
1k
V
DD
+
V
a
V
b
V
DD
+
-
V
OUT
MCP6421
-
R-¨R R+¨R
MCP6421
R
5
100k
10k
V
OUT
=
V
a
–
V
b
-------------
100
Strain Gauge
2013 Microchip Technology Inc.
DS25165A-page 1
MCP6421
NOTES:
DS25165A-page 2
2013 Microchip Technology Inc.
MCP6421
1.0
1.1
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
V
DD
– V
SS
......................................................................................................................................................................................... 6.5V
Current at Analog Input Pins (V
IN
+
, V
IN
-
) ....................................................................................................................................... ±2 mA
Analog Inputs (V
IN
+
, V
IN
-
)†† ............................................................................................................................V
SS
– 1.0V to V
DD
+ 1.0V
All Other Inputs and Outputs ...........................................................................................................................V
SS
– 0.3V to V
DD
+ 0.3V
Difference Input Voltage ........................................................................................................................................................|V
DD
– V
SS
|
Output Short-Circuit Current ................................................................................................................................................. Continuous
Current at Input Pins ...................................................................................................................................................................... ±2 mA
Current at Output and Supply Pins ............................................................................................................................................. ±30 mA
Storage Temperature ..................................................................................................................................................... -65°C to +150°C
Maximum Junction Temperature (T
J
) ........................................................................................................................................... +150°C
ESD Protection on All Pins (HBM; MM)
4 kV; 400V
† Notice:
Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of the device at those or any other conditions above those indicated
in the operational listings of this specification is not implied. Exposure to maximum rating conditions for extended peri-
ods may affect device reliability.
††
See
Section 4.1.2 “Input Voltage Limits”.
1.2
Specifications
DC ELECTRICAL SPECIFICATIONS
TABLE 1-1:
Electrical Characteristics:
Unless otherwise indicated, T
A
= +25°C, V
DD
= +1.8V to +5.5V, V
SS
= GND, V
CM
= V
DD
/2,
V
OUT
= V
DD
/2, V
L
= V
DD
/2, R
L
= 100 k to V
L
and C
L
= 30 pF (refer to
Figure 1-1).
Parameters
Input Offset
Input Offset Voltage
Input Offset Drift with Temperature
Power Supply Rejection Ratio
Input Bias Current and Impedance
Input Bias Current
I
B
—
—
—
Input Offset Current
Common Mode Input Impedance
Differential Input Impedance
Common Mode
Common Mode Input Voltage Range
Common Mode Rejection Ratio
V
CMR
CMRR
V
SS
- 0.3
75
70
—
90
85
V
DD
+ 0.3
—
—
V
dB
dB
V
DD
= 5.5V
V
CM
= -0.3V to 5.8V
V
DD
= 1.8V
V
CM
= -0.3V to 2.1V
I
OS
Z
CM
Z
DIFF
—
—
—
±1
20
800
±1
10
13
||12
10
13
||12
50
—
—
—
—
—
pA
pA
pA
pA
||pF
|pF
T
A
= +85°C
T
A
= +125°C
V
OS
V
OS
/T
A
PSRR
-1.0
—
75
—
±3.0
90
1.0
—
—
mV
V
DD
= 3.0V; V
CM
= V
DD
/
4
Sym
Min
Typ
Max
Units
Conditions
µV/°C T
A
= -40°C to +125°C,
V
CM
= V
SS
dB
V
CM
= V
SS
2013 Microchip Technology Inc.
DS25165A-page 3
MCP6421
TABLE 1-1:
DC ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics:
Unless otherwise indicated, T
A
= +25°C, V
DD
= +1.8V to +5.5V, V
SS
= GND, V
CM
= V
DD
/2,
V
OUT
= V
DD
/2, V
L
= V
DD
/2, R
L
= 100 k to V
L
and C
L
= 30 pF (refer to
Figure 1-1).
Parameters
Open-Loop Gain
DC Open-Loop Gain
(Large Signal)
Output
High-Level Output Voltage
Low-Level Output Voltage
Output Short-Circuit Current
Power Supply
Supply Voltage
Quiescent Current per Amplifier
V
DD
I
Q
1.8
—
—
4.4
5.5
5.5
V
µA
I
O
= 0, V
CM
= V
DD
/4
V
OH
V
OL
I
SC
1.796
5.495
—
—
—
—
1.799
5.499
0.001
0.001
±6
±22
—
—
0.004
0.005
—
—
V
V
V
V
mA
mA
V
DD
= 1.8V
V
DD
= 5.5V
V
DD
= 1.8V
V
DD
= 5.5V
V
DD
= 1.8V
V
DD
= 5.5V
A
OL
95
115
—
dB
0.3 < V
OUT
< (V
DD
-0.3V)
V
CM
= V
SS
V
DD
= 5.5V
Sym
Min
Typ
Max
Units
Conditions
TABLE 1-2:
AC ELECTRICAL SPECIFICATIONS
Electrical Characteristics:
Unless otherwise indicated, T
A
= +25°C, V
DD
= +1.8V to +5.5V, V
SS
= GND, V
CM
= V
DD
/2,
V
OUT
= V
DD
/2, V
L
= V
DD
/2, R
L
= 100 k to V
L
and C
L
= 30 pF (refer to
Figure 1-1).
Parameters
AC Response
Gain Bandwidth Product
Phase Margin
Slew Rate
Noise
Input Noise Voltage
Input Noise Voltage Density
Input Noise Current Density
Electromagnetic Interference
Rejection Ratio
E
ni
e
ni
i
ni
EMIRR
—
—
—
—
—
—
—
—
15
95
90
0.6
77
92
97
99
—
—
—
—
—
—
—
—
µVp-p
nV/Hz
nV/Hz
fA/Hz
dB
f = 0.1 Hz to 10 Hz
f = 1 kHz
f = 10 kHz
f = 1 kHz
V
IN
= 100 mV
PK
,
400 MHz
V
IN
= 100 mV
PK
,
900 MHz
V
IN
= 100 mV
PK
,
1800 MHz
V
IN
= 100 mV
PK
,
2400 MHz
GBWP
PM
SR
—
—
—
90
55
0.05
—
—
—
kHz
°
V/µs
G = +1 V/V
Sym
Min
Typ
Max
Units
Conditions
DS25165A-page 4
2013 Microchip Technology Inc.
MCP6421
TABLE 1:
TEMPERATURE SPECIFICATIONS
Parameters
Temperature Ranges
Operating Temperature Range
Storage Temperature Range
Thermal Package Resistances
Thermal Resistance, 5L-SC70
Thermal Resistance, 5L-SOT-23
Note 1:
JA
JA
—
—
331
220.7
—
—
°C/W
°C/W
T
A
T
A
-40
-65
—
—
+125
+150
°C
°C
Note 1
Sym
Min
Typ
Max
Units
Conditions
Electrical Characteristics:
Unless otherwise indicated, V
DD
= +1.8V to +5.5V and V
SS
= GND.
The internal junction temperature (T
J
) must not exceed the absolute maximum specification of +150°C.
C
F
6.8 pF
R
G
100 k
V
P
V
IN+
MCP6421
V
IN–
V
M
R
G
100 k
R
F
100 k
C
F
6.8 pF
R
L
100 k
V
OUT
C
L
30 pF
C
B1
100 nF
R
F
100 k
V
DD
V
DD
/2
1.3
Test Circuits
The circuit used for most DC and AC tests is shown in
Figure 1-1.
This circuit can independently set V
CM
and
V
OUT
(see
Equation 1-1).
Note that V
CM
is not the
circuit’s Common mode voltage ((V
P
+ V
M
)/2), and that
V
OST
includes V
OS
plus the effects (on the input offset
error, V
OST
) of the temperature, CMRR, PSRR and
A
OL
.
EQUATION 1-1:
G
DM
= R
F
R
G
V
CM
=
V
P
+ V
DD
2
2
C
B2
1 µF
V
OUT
=
V
DD
2
+
V
P
–
V
M
+ V
OST
1 + G
DM
Where:
G
DM
= Differential Mode Gain
V
CM
= Op Amp’s Common Mode
Input Voltage
(V/V)
(V)
V
OST
= V
IN–
–
V
IN+
V
L
V
OST
= Op Amp’s Total Input Offset Voltage (mV)
FIGURE 1-1:
AC and DC Test Circuit for
Most Specifications.
2013 Microchip Technology Inc.
DS25165A-page 5
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