The MAX44246 is a 36V, ultra-precision, low-noise, low-
drift, dual operational amplifier that offers near-zero DC
offset and drift through the use of patented chopper
stabilized and auto-zeroing techniques. This method
constantly measures and compensates the input off-
set, eliminating drift over time and temperature and the
effect of 1/f noise. This dual device features rail-to-rail
outputs, operates from a single 2.7V to 36V supply, and
consumes only 0.42mA per channel, with only 9nV/√Hz
input-referred voltage noise.
The IC is unity-gain stable with a gain-bandwidth product
of 5MHz. With excellent specifications such as offset
voltage of 5FV (max), drift of 20nV/NC (max), and
117nV
P-P
noise in 0.1Hz to 10Hz, the IC is ideally
suited for applications requiring ultra-low noise, and DC
precision such as interfacing with pressure sensors,
strain gauges, precision weight scales, and medical
instrumentation.
The IC is available in 8-pin
FMAXM
or SO packages and
is rated over the -40NC to +125NC temperature range.
S
2.7V to 36V Power-Supply Range
S
Ultra-Low Input V
OS
: 5µV (max)
S
Low 20nV/°C (max) of Offset Drift
S
Low 9nV/√Hz noise at 1kHz
S
1µs Fast Settling Time
S
5MHz Gain-Bandwidth Product
S
Rail-to-Rail Output
S
Integrated EMI Filter
S
Low 0.55mA Per Channel (max) Quiescent Current
S
8-Pin µMAX/SO Package
Ordering Information
appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to
www.maximintegrated.com/MAX44246.related.
Features
Applications
Transducer Amplifiers
Load Cell Amplifiers
Precision
Instrumentation
Battery-Powered
Equipment
PLC Analog I/O
Modules
µ
MAX is a registered trademark of Maxim Integrated Products, Inc.
Typical Operating Circuit
15V
3.3V
MAX44246
BUFFER
R
15V
50R
G
R
20V
V
DD
R
G
50R
G
15V
R
BUFFER
1.5V
R
BUFFER
V
IN+
V
REF
OUTPUT
R
1
3V
V
OUT
MAX6126
V
DD
MAX11211
V
IN-
V
SS
MICRO-
PROCESSOR
MAX44246
C
1
MAX44246
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-6375; Rev 1; 9/12
MAX44246
36V, Low-Noise, Precision, Dual Op Amp
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
DD
to GND) .............................-0.3V to +40V
All Other Pins................................(GND - 0.3V) to (V
DD
+ 0.3V)
Short-Circuit Duration, OUTA,
OUTB to Either Supply Rail………………………… ............. 1s
Continuous Input Current (Any Pin) ..................................20mA
Differential Input Current .................................................
Q20mA
Differential Input Voltage (Note 1)....................................... .Q6V
Continuous Power Dissipation (T
A
= +70NC)
8-Pin
FMAX
(derate 4.8mW/C above +70NC) .........387.8mW
8-Pin SO (derate 4.8mW/C above +70NC) ..............470.6mW
Operating Temperature Range ........................ -40NC to +125NC
Junction Temperature ....................................................+150NC
Storage Temperature Range............................ -65NC to +150NC
Lead Temperature (soldering,10s) .................................+300NC
Soldering Temperature (reflow) ......................................+260NC
Note 1:
The amplifier inputs are connected by internal back-to-back clamp diodes. In order to minimize noise in the input stage,
current-limiting resistors are not used. If differential input voltages exceeding ±1V are applied, limit input current to 20mA.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
PACKAGE THERMAL CHARACTERISTICS (Note 2)
µMAX
Junction-to-Ambient Thermal Resistance (q
JA
) ........221NC/W
Junction-to-Case Thermal Resistance (q
JC
) ..............42NC/W
SO
Junction-to-Ambient Thermal Resistance (q
JA
) ........120NC/W
Junction-to-Case Thermal Resistance (q
JC
) ..............37NC/W
Note 2:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to
www.maximintegrated.com/thermal-tutorial.
ELECTRICAL CHARACTERISTICS
(V
DD
= 30V,
V
GND
= 0V, V
IN+
= V
IN-
= V
DD
/2, R
L
= 5kΩ to V
DD
/2, T
A
= -40°C to +125°C, unless otherwise noted. Typical values at
T
A
= +25°C.) (Note 3)
PARAMETER
Supply Voltage Range
Power-Supply Rejection Ratio
(Note 4)
Quiescent Current per Amplifier
Power-Up Time
DC SPECIFICATIONS
Input Common-Mode Range
Common-Mode Rejection Ratio
(Note 4)
Input Offset Voltage (Note 4)
Input Offset Voltage Drift
(Note 4)
Input Bias Current (Note 4)
V
CM
CMRR
V
OS
TC V
OS
I
B
T
A
= +25NC
-40NC < T
A
< +125NC
Guaranteed by CMRR test
V
CM
= (V
GND
+ 0.05V) to (V
DD
- 1.5V)
V
GND
- 0.05
146
166
1
1
300
5
20
600
1250
V
DD
- 1.5
V
dB
FV
nV/NC
pA
SYMBOL
V
DD
PSRR
IDD
t
ON
CONDITIONS
Guaranteed by PSRR
V
DD
= 2.7V to 36V, T
A
= +25NC
V
DD
= 2.7V to 36V, -40NC < T
A
< +125NC
R
L
=
J
T
A
= +25NC
-40NC < T
A
< +125NC
20
MIN
2.7
148
146
0.42
0.55
0.60
166
TYP
MAX
36
UNITS
V
dB
mA
Fs
Maxim Integrated
2
MAX44246
36V, Low-Noise, Precision, Dual Op Amp
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 30V,
V
GND
= 0V, V
IN+
= V
IN-
= V
DD
/2, R
L
= 5kΩ to V
DD
/2, T
A
= -40°C to +125°C, unless otherwise noted. Typical values at
T
A
= +25°C.) (Note 3)
PARAMETER
Input Offset Current (Note 4)
Open-Loop Gain (Note 4)
Output Short-Circuit Current
SYMBOL
I
OS
A
VOL
T
A
= +25NC
-40NC < T
A
< +125NC
(V
GND
+ 0.5V)
P
V
OUT
P
(VDD – 0.5V)
Noncontinuous
T
A
= +25NC
-40NC < T
A
< +125NC
Output Voltage High
V
OH
T
A
= +25NC
-40NC < T
A
< +125NC
AC SPECIFICATIONS
Input Voltage-Noise Density
Input Voltage Noise
Input Capacitance
Gain-Bandwidth Product
Phase Margin
Slew Rate
Capacitive Loading
C
IN
GBW
PM
SR
C
L
C
L
= 20pF
A
V
= 1V/V, V
OUT
= 4V
P-P
No sustained oscillation, A
V
= 1V/V
V
OUT
= 4V
P-P
,
A
V
= +1V/V
V
OUT
= 2V
P-P
,
A
V
= +1V/V
f = 1kHz
f = 20kHz
f = 1kHz
f = 20kHz
e
N
f = 1kHz
0.1Hz < f < 10Hz
9
117
2
5
60
3.8
300
-96
-77
-91
-76
nV/√Hz
nV
P-P
pF
MHz
Degrees
CONDITIONS
MIN
TYP
600
MAX
1200
2500
UNITS
pA
dB
mA
154
168
40
30
90
115
180
Sinking
Sourcing
Output Voltage Low
V
OL
mV
(V
DD
-
0.17)
(V
DD
-
0.25)
(V
DD
-
0.13)
V
V/Fs
pF
dB
dB
Total Harmonic Distortion
THD
ELECTRICAL CHARACTERISTICS
(V
DD
= 10V,
V
GND
= 0V, V
IN+
= V
IN-
= V
DD
/2, R
L
= 5kΩ to V
DD
/2, T
A
= -40°C to +125°C, unless otherwise noted. Typical values at
T
A
= +25°C.) (Note 3)
PARAMETER
POWER SUPPLY
Quiescent Current per Amplifier
Power-Up Time
DC SPECIFICATIONS
Input Common-Mode Range
Maxim Integrated
SYMBOL
CONDITIONS
T
A
= +25NC
-40NC < T
A
< +125NC
MIN
TYP
0.42
20
MAX
0.55
0.60
UNITS
I
DD
t
ON
R
L
=
J
mA
Fs
V
CM
Guaranteed by CMRR test
(GND -
0.05)
(V
DD
–
1.5)
V
3
MAX44246
36V, Low-Noise, Precision, Dual Op Amp
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 10V,
V
GND
= 0V, V
IN+
= V
IN-
= V
DD
/2, R
L
= 5kΩ to V
DD
/2, T
A
= -40°C to +125°C, unless otherwise noted. Typical values at
T
A
= +25°C.) (Note 3)
PARAMETER
Common-Mode Rejection Ratio
(Note 4)
Input Offset Voltage (Note 4)
Input Offset Voltage Drift (Note 4)
Input Bias Current (Note 4)
Input Offset Current (Note 4)
Open-Loop Gain (Note 4)
Output Short-Circuit Current
Output Voltage Low
V
OL
SYMBOL
CONDITIONS
T
A
= +25NC,
V
CM
= (V
GND
- 0.05V) to
(V
DD
- 1.5V)
-40NC < T
A
< +125NC,
V
CM
= (V
GND
-
0.05V) to (V
DD
- 1.5V)
MIN
142
140
1
2.4
T
A
= +25NC
-40NC < T
A
< +125NC
T
A
= +25NC
-40NC < T
A
< +125NC
(V
GND
+ 0.5V) ≤ V
OUT
≤ (V
DD
- 0.5V)
Noncontinuous
T
A
= +25NC
-40NC < T
A
< +125NC
T
A
= +25NC
-40NC < T
A
< +125NC
AC SPECIFICATIONS
Input Voltage-Noise Density
Input Voltage Noise
Input Capacitance
Gain-Bandwidth Product
Phase Margin
Slew Rate
Capacitive Loading
Total Harmonic Distortion
Settling Time
C
IN
GBW
PM
SR
C
L
THD
C
L
= 20pF
A
V
= +1V/V, V
OUT
= 2V
P-P
, 10% to 90%
No sustained oscillation,
A
V
= 1V/V
V
OUT
= 2V
P-P
,
A
V
= 1V/V
f = 1kHz
f = 20kHz
e
N
f = 1kHz
0.1Hz < f < 10Hz
9
117
2
5
60
3.8
300
-92
-76
1
nV/√Hz
nV
P-P
pF
MHz
Degrees
V/µs
pF
dB
µs
(V
DD
-
0.06)
(V
DD
-
0.09)
(V
DD
-
0.05)
Sinking
Sourcing
144
164
40
30
30
40
60
600
300
5
20
600
1100
1200
2200
FV
nV/NC
pA
pA
dB
mA
mV
TYP
158
dB
MAX
UNITS
CMRR
V
OS
TC V
OS
I
B
I
OS
A
VOL
Output Voltage High
V
OH
V
To 0.01%, V
OUT
= 2V step, A
V
=
1V/V
Note 3:
All devices are 100% production tested at T
A
= +25°C. Temperature limits are guaranteed by design.
Note 4:
Guaranteed by design.
Maxim Integrated
4
MAX44246
36V, Low-Noise, Precision, Dual Op Amp
Typical Operating Characteristics
(V
DD
= 10V, V
GND
= 0V, V
IN+
= V
IN-
= V
DD
/2, R
L
= 5kΩ to V
DD
/2, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are
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