EVALUATION KIT AVAILABLE
MAX44246
36V, Low-Noise, Precision, Dual Op Amp
General Description
The MAX44246 is a 36V, ultra-precision, low-noise, lowdrift, 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 offset, 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
117nVP-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.
Features
S2.7V to 36V Power-Supply Range
SUltra-Low Input VOS: 5µV (max)
SLow 20nV/°C (max) of Offset Drift
SLow 9nV/√Hz noise at 1kHz
S1µs Fast Settling Time
S5MHz Gain-Bandwidth Product
SRail-to-Rail Output
SIntegrated EMI Filter
SLow 0.55mA Per Channel (max) Quiescent Current
S8-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.
Applications
Transducer Amplifiers
Battery-Powered
Equipment
Load Cell Amplifiers
µMAX is a registered trademark of Maxim Integrated Products, Inc.
PLC Analog I/O
Modules
Precision
Instrumentation
Typical Operating Circuit
15V
3.3V
MAX44246
R1
BUFFER
R
R
50RG
BUFFER
R
VINR
1.5V
MAX44246
VREF
VIN+
MAX11211
15V
BUFFER
VDD
20V
VDD
RG
VOUT
MAX6126
15V
50RG
3V
MICROPROCESSOR
OUTPUT
VSS
C1
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 2; 2/13
MAX44246
36V, Low-Noise, Precision, Dual Op Amp
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VDD to GND) ..............................-0.3V to +40V
All Other Pins.................................(GND - 0.3V) to (VDD + 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 (TA = +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 operation 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 (qJA).........221NC/W
Junction-to-Case Thermal Resistance (qJC) ...............42NC/W
SO
Junction-to-Ambient Thermal Resistance (qJA).........120NC/W
Junction-to-Case Thermal Resistance (qJC) ...............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
(VDD = 30V, VGND = 0V, VIN+ = VIN- = VDD /2, RL = 5kΩ to VDD /2, TA = -40°C to +125°C, unless otherwise noted. Typical values at
TA = +25°C.) (Note 3)
PARAMETER
Supply Voltage Range
Power-Supply Rejection Ratio
(Note 4)
SYMBOL
VDD
PSRR
Quiescent Current per Amplifier
IDD
Power-Up Time
tON
CONDITIONS
MIN
Guaranteed by PSRR
2.7
VDD = 2.7V to 36V, TA = +25NC
148
VDD = 2.7V to 36V, -40NC < TA < +125NC
146
RL = J
TYP
UNITS
36
V
166
0.42
TA = +25NC
MAX
-40NC < TA < +125NC
dB
0.55
0.60
20
mA
Fs
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)
Maxim Integrated
VCM
CMRR
Guaranteed by CMRR test
VCM = (V GND + 0.05V) to (VDD - 1.5V)
V GND - 0.05
146
VDD - 1.5
V
dB
166
VOS
1
5
FV
TC VOS
1
20
nV/NC
300
600
IB
TA = +25NC
-40NC < TA < +125NC
1250
pA
2
MAX44246
36V, Low-Noise, Precision, Dual Op Amp
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 30V, VGND = 0V, VIN+ = VIN- = VDD /2, RL = 5kΩ to VDD /2, TA = -40°C to +125°C, unless otherwise noted. Typical values at
TA = +25°C.) (Note 3)
PARAMETER
Input Offset Current (Note 4)
Open-Loop Gain (Note 4)
SYMBOL
IOS
AVOL
Output Short-Circuit Current
Output Voltage Low
CONDITIONS
TYP
MAX
600
1200
-40NC < TA < +125NC
(V GND + 0.5V) P VOUT P (VDD – 0.5V)
Noncontinuous
VOL
MIN
TA = +25NC
2500
154
168
Sinking
40
Sourcing
30
90
TA = +25NC
-40NC < TA < +125NC
Output Voltage High
VOH
UNITS
pA
dB
mA
115
mV
180
TA = +25NC
(VDD 0.17)
-40NC < TA < +125NC
(VDD 0.25)
(VDD 0.13)
V
AC SPECIFICATIONS
Input Voltage-Noise Density
eN
Gain-Bandwidth Product
9
117
nV/√Hz
nVP-P
CIN
2
pF
GBW
5
MHz
Input Voltage Noise
Input Capacitance
f = 1kHz
0.1Hz < f < 10Hz
Phase Margin
PM
CL = 20pF
60
Degrees
Slew Rate
SR
AV = 1V/V, VOUT = 4VP-P
3.8
V/Fs
Capacitive Loading
CL
No sustained oscillation, AV = 1V/V
300
pF
Total Harmonic Distortion
THD
VOUT = 4VP-P,
AV = +1V/V
f = 1kHz
-96
f = 20kHz
-77
VOUT = 2VP-P,
AV = +1V/V
f = 1kHz
-91
f = 20kHz
-76
dB
dB
ELECTRICAL CHARACTERISTICS
(VDD = 10V, VGND = 0V, VIN+ = VIN- = VDD /2, RL = 5kΩ to VDD /2, TA = -40°C to +125°C, unless otherwise noted. Typical values at
TA = +25°C.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
0.42
0.55
UNITS
POWER SUPPLY
Quiescent Current per Amplifier
IDD
Power-Up Time
tON
RL = J
TA = +25NC
-40NC < TA < +125NC
0.60
20
mA
Fs
DC SPECIFICATIONS
Input Common-Mode Range
Maxim Integrated
VCM
Guaranteed by CMRR test
(GND 0.05)
(VDD –
1.5)
V
3
MAX44246
36V, Low-Noise, Precision, Dual Op Amp
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 10V, VGND = 0V, VIN+ = VIN- = VDD /2, RL = 5kΩ to VDD /2, TA = -40°C to +125°C, unless otherwise noted. Typical values at
TA = +25°C.) (Note 3)
PARAMETER
Common-Mode Rejection Ratio
(Note 4)
Input Offset Voltage (Note 4)
Input Offset Voltage Drift (Note 4)
SYMBOL
CMRR
142
158
-40NC < TA < +125NC, VCM = (V GND 0.05V) to (VDD - 1.5V)
140
MAX
UNITS
dB
5
FV
TC VOS
2.4
20
nV/NC
300
600
Input Offset Current (Note 4)
IOS
AVOL
Output Short-Circuit Current
Output Voltage High
TYP
1
IB
Output Voltage Low
CONDITIONS
VOS
Input Bias Current (Note 4)
Open-Loop Gain (Note 4)
MIN
TA = +25NC, VCM = (V GND - 0.05V) to
(VDD - 1.5V)
TA = +25NC
-40NC < TA < +125NC
VOH
600
TA = +25NC
-40NC < TA < +125NC
1200
2200
(V GND + 0.5V) ≤ VOUT ≤ (VDD - 0.5V)
Noncontinuous
VOL
1100
144
164
Sinking
40
Sourcing
30
30
TA = +25NC
-40NC < TA < +125NC
(VDD 0.06)
-40NC < TA < +125NC
(VDD 0.09)
(VDD 0.05)
pA
dB
mA
40
60
TA = +25NC
pA
mV
V
AC SPECIFICATIONS
Input Voltage-Noise Density
eN
Gain-Bandwidth Product
9
117
nV/√Hz
nVP-P
CIN
2
pF
GBW
5
MHz
Input Voltage Noise
Input Capacitance
f = 1kHz
0.1Hz < f < 10Hz
Phase Margin
PM
CL = 20pF
60
Degrees
Slew Rate
SR
3.8
V/µs
Capacitive Loading
CL
AV = +1V/V, VOUT = 2VP-P, 10% to 90%
No sustained oscillation, AV = 1V/V
300
pF
Total Harmonic Distortion
Settling Time
THD
VOUT = 2VP-P,
AV = 1V/V
f = 1kHz
-92
f = 20kHz
-76
To 0.01%, VOUT = 2V step, AV = 1V/V
1
dB
µs
Note 3: All devices are 100% production tested at TA = +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
(VDD = 10V, VGND = 0V, VIN+ = VIN- = VDD/2, RL = 5kΩ to VDD/2, TA = -40°C to +125°C, unless otherwise noted. Typical values are
at TA = +25°C.) (Note 3)
INPUT OFFSET VOLTAGE DRIFT
HISTOGRAM
20
15
10
5
-1.0
-1.5
MAX44246 toc02
400
30
25
20
15
-0.5
0
0.5
1.0
300
250
200
150
10
100
5
50
0
0
0.002 0.003 0.005
5
10
15
20
25
30
OFFSET VOLTAGE DRIFT (µV/°C)
SUPPLY VOLTAGE (V)
SUPPLY CURRENT PER AMPLIFIER
vs. TEMPERATURE
INPUT OFFSET VOLTAGE vs. INPUT
COMMON-MODE VOLTAGE
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
430
420
410
1
0
-1
40
100
125
MAX44246 toc06
2
35
5
INPUT OFFSET VOLTAGE (µV)
440
MAX44246 toc05
450
3
INPUT OFFSET VOLTAGE (µV)
VIN = VDD/2
NO LOAD
460
-0.006 -0.004 -0.002
1.5
VIN = VDD/2
NO LOAD
350
OFFSET VOLTAGE (µV)
MAX44246 toc04
470
0
-2
400
0
25
50
75
100
-3
125
-5
0
1
2
3
4
5
6
7
8
9
-25
0
25
50
75
VCM (V)
TEMPERATURE (°C)
INPUT BIAS CURRENT vs. VCM
vs. TEMPERATURE
INPUT BIAS CURRENT
vs. TEMPERATURE
COMMON-MODE REJECTION RATIO
vs. TEMPERATURE
IB- (TA = +25°C)
IB- (TA = +125°C)
IB- (TA = -40°C)
IB+ (TA = +25°C)
IB+ (TA = -40°C)
1000
800
600
1
2
3
4
VCM (V)
Maxim Integrated
5
6
7
8
9
170
160
400
150
IB+
200
0
IB-
-200
140
130
120
-400
110
-600
100
-800
90
-1000
0
180
MAX44246 toc09
INPUT BIAS CURRENT (pA)
IB+ (TA = +125°C)
-1
-50
TEMPERATURE (°C)
INPUT BIAS CURRENT (pA)
2000
1800
1600
1400
1200
1000
800
600
400
200
0
-200
-400
-600
-800
-1000
-25
MAX44246 toc07
-50
CMRR (dB)
SUPPLY CURRENT (µA)
35
450
0
0
390
500
SUPPLY CURRENT (µA)
25
40
MAX44246 toc08
PERCENT OCCURENCE (%)
30
45
PERCENT OCCURRENCE (%)
MAX44246 toc01
35
SUPPLY CURRENT PER AMPLIFIER
vs. SUPPLY VOLTAGE
MAX44246 toc03
INPUT OFFSET VOLTAGE HISTOGRAM
80
-50
-25
0
25
50
75
TEMPERATURE (°C)
100
125
-50
-25
0
25
50
75
100
125
TEMPERATURE (°C)
5
MAX44246
36V, Low-Noise, Precision, Dual Op Amp
Typical Operating Characteristics (continued)
(VDD = 10V, VGND = 0V, VIN+ = VIN- = VDD/2, RL = 5kΩ to VDD/2, TA = -40°C to +125°C, unless otherwise noted. Typical values are
at TA = +25°C.) (Note 3)
POWER-SUPPLY REJECTION RATIO
vs. TEMPERATURE
170
80
140
40
120
110
0
100
-20
90
1
10
100
1k
10k 100k 1M 10M
-25
25
50
75
100
OUTPUT VOLTAGE LOW
vs. OUTPUT SINK CURRENT
OUTPUT VOLTAGE HIGH
vs. OUTPUT SINK CURRENT
300
250
200
150
100
10.05
10.00
70
9.95
60
9.90
50
9.85
VOL (mV)
350
9.80
9.75
10
0
9.50
2
4
6
8
10
0
2
OUTPUT SINK CURRENT (mA)
4
6
8
10
OUTPUT VOLTAGE HIGH
vs. TEMPERATURE
2
MAX44246 toc16
9.965
9.960
0
-2
NORMALIZED GAIN,
VIN = 100mVP-P
9.955
9.950
9.945
9.935
9.930
25
50
75
TEMPERATURE (°C)
Maxim Integrated
100
125
25
50
75
100
125
LARGE-SIGNAL GAIN vs. FREQUENCY
0
-5
NORMALIZED GAIN,
VIN = 2VP-P
-10
-6
-8
-10
-12
-15
-20
-25
-30
-35
-14
9.940
0
0
5
MAGNITUDE (dB)
MAGNITUDE (dB)
-4
-25
-25
TEMPERATURE (°C)
SMALL-SIGNAL GAIN vs. FREQUENCY
9.970
-50
-50
OUTPUT SINK CURRENT (mA)
MAX44246 toc17
0
30
20
9.65
9.55
0
40
9.70
9.60
50
10 100 1k 10k 100k 1M 10M100M
OUTPUT VOLTAGE LOW
vs. TEMPERATURE
MAX44246 toc14
MAX44246 toc13
400
0.01 0.1 1
125
FREQUENCY (Hz)
TEMPERATURE (°C)
450
OUTPUT VOLTAGE HIGH (V)
0
FREQUENCY (Hz)
500
50
-50
-50
OUTPUT VOLTAGE HIGH (mV)
0.1
100
0
80
-40
OUTPUT VOLTAGE HIGH (mV)
130
20
150
MAX44246 toc18
60
VIN = 100mVP-P
MAX44246 toc15
150
MAGNITUDE (dB)
160
100
PSRR (dB)
MAGNITUDE (dB)
120
OPEN-LOOP GAIN vs. FREQUENCY
200
MAX44246 toc11
100mVP-P
140
180
MAX44246 toc10
160
MAX44246 toc12
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
-16
-40
-18
-45
-50
-20
10
100
1k
10k
100k
FREQUENCY (Hz)
1M
10M 100M
10
100
1k
10k
100k
1M
10M 100M
FREQUENCY (Hz)
6
MAX44246
36V, Low-Noise, Precision, Dual Op Amp
Typical Operating Characteristics (continued)
(VDD = 10V, VGND = 0V, VIN+ = VIN- = VDD/2, RL = 5kΩ to VDD/2, TA = -40°C to +125°C, unless otherwise noted. Typical values are
at TA = +25°C.) (Note 3)
INPUT VOLTAGE NOISE vs. FREQUENCY
MAX44246 toc19
INPUT VOLTAGE NOISE (nV/√Hz)
INPUT VOLTAGE 0.1Hz TO 10Hz NOISE
MAX44246 toc20
85
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
200nV/div
1
10
100
1k
100k
10k
1s/div
FREQUENCY (Hz)
LARGE-SIGNAL (2VP-P)
STEP RESPONSE vs. TIME
SMALL-SIGNAL (100mVP-P)
STEP RESPONSE vs. TIME
MAX44246 toc22
MAX44246 toc21
VIN
50mV/div
VIN
1V/div
VOUT
50mV/div
VOUT
1V/div
1µs/div
1µs/div
STABILITY vs. CAPACITIVE AND
RESISTIVE LOAD IN PARALLEL
STABILITY vs. CAPACITIVE LOAD AND
SERIES ISOLATION RESISTANCE
10
RISO (I)
10
RESISTIVE LOAD (kI)
STABLE
UNSTABLE
1
POWER-UP TIME
MAX44246 toc24
100
MAX44246 toc23
100
MAX44246 toc25
VDD = VSS = 0V
VDD = 10V
5V/div
1
UNSTABLE
0.1
STABLE
VIN = VOUT = 0V
0.01
200mV/div
0.001
0.1
100
1k
10k
CAPACITIVE LOAD (pF)
Maxim Integrated
100k
100
1k
10k
CAPACITIVE LOAD (pF)
100k
20µs
7
MAX44246
36V, Low-Noise, Precision, Dual Op Amp
Typical Operating Characteristics (continued)
(VDD = 10V, VGND = 0V, VIN+ = VIN- = VDD/2, RL = 5kΩ to VDD/2, TA = -40°C to +125°C, unless otherwise noted. Typical values are
at TA = +25°C.) (Note 3)
TOTAL HARMONIC DISTORTION
vs. OUTPUT AMPLITUDE
MAX44246 toc27
-40
-50
-40
-60
-70
-120
100
1k
10k
1
2
3 4 5 6 7 8
OUTPUT AMPLITUDE (V)
10
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
MAX44246 toc29
90
80
70
-40
-50
-60
-70
-80
-90
-100
-110
2VP-P INPUT
60
50
40
30
20
4VP-P INPUT
10
0
-120
10
100
1k
FREQUENCY (Hz)
Maxim Integrated
1
10
100
EMIRR (dB)
THD (dB)
-20
-30
9
EMIRR
vs. FREQUENCY (VDD = 3.3V)
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
VDD = 30V
-100
-160
0
FREQUENCY (Hz)
0
-10
-80
-140
-120
100k
-60
-120
-100
4VP-P OUTPUT
10
-60
-80
2VP-P OUTPUT
-40
MAX44246 toc30
-80
-90
-100
-110
-20
CROSSTALK (dB)
-20
THD (dB)
THD (dB)
-20
-30
CROSSTALK vs. FREQUENCY
0
0
MAX44246 toc26
0
-10
MAX44246 toc28
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
10k
100k
1
10
100
1000
10000
FREQUENCY (MHz)
8
MAX44246
36V, Low-Noise, Precision, Dual Op Amp
Pin Configuration
TOP VIEW
+
OUTA 1
8
VDD
INA- 2
7
OUTB
3
6
INB-
GND 4
5
INB+
INA+
MAX44246
µMAX/SO
Pin Description
PIN
NAME
1
OUTA
FUNCTION
2
INA-
Channel-A Negative Input
3
INA+
Channel-A Positive Input
4
GND
Ground
5
INB+
Channel-B Positive Input
6
INB-
Channel-B Negative Input
7
OUTB
8
VDD
Channel-A Output
Channel-B Output
Supply Voltage
Detailed Description
The 1/f noise appears as a slow varying offset voltage and
is eliminated by the chopping technique used.
The MAX44246 is a high-precision amplifier that provides
below 5µV of maximum input-referred offset and low
flicker noise. These characteristics are achieved by using
a combination of proprietary auto-zeroing and chopper
stabilized techniques. This combination of auto-zeroing
and chopping ensures that these amplifiers give all the
benefits of zero-drift amplifiers, while still ensuring low
noise, minimizing chopper spikes, and providing wide
bandwidth. Offset voltages due to power ripple/spikes as
well as common-mode variation, are corrected resulting
in excellent PSRR and CMRR specifications.
Electromagnetic interference (EMI) noise occurs at higher
frequency, resulting in malfunction or degradation of electrical equipment. The ICs have an input EMI filter to avoid
the output being affected by radio frequency interference.
The EMI filter composed of passive devices, presents significant higher impedance to higher frequency.
Noise Suppression
Flicker noise, inherent in all active devices, is inversely proportional to frequency present. Charges at the
oxide-silicon interface that are trapped-and-released
by MOSFET oxide occurs at low frequency more often.
For this reason, flicker noise is also called 1/f noise. The
MAX44246 eliminates the 1/f noise internally, thus making
it an ideal choice for DC or sub-Hz precision applications.
Maxim Integrated
Applications Information
ADC Buffer Amplifier
The MAX44246 has low input offset voltage, low noise,
and fast settling time that make this amplifier ideal for
ADC buffers. Weight scales are one application that often
requires a low-noise, high-voltage amplifier in front of an
ADC. The Typical Operating Circuit details an example
of a load cell and amplifier driven from the same ±10V
supplies, along with the MAX11211 18-bit delta sigma
ADC. Load cells produce a very small voltage change at
their outputs; therefore driving the excitation source with a
higher voltage produces a wider dynamic range that can
be measured at the ADC inputs.
9
MAX44246
36V, Low-Noise, Precision, Dual Op Amp
The MAX11211 ADC operates from a single 2.7V to 3.6V
analog supply, offers 18-bit noise-free resolution and
0.86mW power dissipation. The MAX11211 also offers
> 100dB rejection at 50Hz and 60Hz. This ADC is part of
a family of 16-, 18-, 20-, and 24-bit delta sigma ADCs with
high precision and < 1mW power dissipation.
The low input offset voltage and low noise of MAX44246
allows a gain circuit to precede the MAX11211 without
losing any dynamic range at the ADC. See the Typical
Operating Circuit.
Precision Low-Side Current Sensing
The ICs’ ultra-low offset voltage and drift make them
ideal for precision current-sensing applications. Figure 1
shows the ICs in a low-side current-sense configuration.
This circuit produces an accurate output voltage, VOUT
equal to ILOAD x RSENSE x (1 + R2 /R1).
Layout Guidelines
The MAX44246 features ultra-low offset voltage and
noise. Therefore, to get optimum performance follow the
following layout guidelines.
Avoid temperature gradients at the junction of two dissimilar metals. The most common dissimilar metals used
on a PCB are solder-to-component lead and solder-toboard trace. Dissimilar metals create a local thermocouple. A variation in temperature across the board can
cause an additional offset due to Seebeck effect at the
solder junctions. To minimize the Seebeck effect, place
Maxim Integrated
VSUPPLY
ILOAD
MAX44246
OUT
RSENSE
R2
R1
Figure 1. Low-Side Current Sensing
the amplifier away from potential heat sources on the
board, if possible. Orient the resistors such that both
the ends are heated equally. It is a good practice to
match the input signal path to ensure that the type and
number of thermoelectric junctions remain the same. For
example, consider using dummy 0Ω resistors oriented
in such a way that the thermoelectric sources, due to
the real resistors in the signal path, are cancelled. It is
recommended to flood the PCB with ground plane. The
ground plane ensures that heat is distributed uniformly
reducing the potential offset voltage degradation due to
Seebeck effect.
10
MAX44246
36V, Low-Noise, Precision, Dual Op Amp
Package Information
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX44246ASA+
-40NC to +125NC
8 SO
MAX44246AUA+
-40NC to +125NC
8 FMAX
+Denotes a lead(Pb)-free/RoHS-compliant package.
Chip Information
PROCESS: BiCMOS
Maxim Integrated
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a
“+”, “#”, or “-” in the package code indicates RoHS status only.
Package drawings may show a different suffix character, but the
drawing pertains to the package regardless of RoHS status.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
8 µMAX
U8+3
21-0036
90-0092
8 SO
S8+4
21-0041
90-0096
11
MAX44246
36V, Low-Noise, Precision, Dual Op Amp
Revision History
REVISION
NUMBER
REVISION
DATE
0
7/12
Initial release
1
9/12
Revised the Electrical Characteristics and the Typical Operating Characteristics.
2
2/13
Revised the Typical Operating Characteristics.
DESCRIPTION
PAGES
CHANGED
—
1, 2, 3, 5
8
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent
licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and
max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000
© 2013
Maxim Integrated
12
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