MAX44251 [MAXIM]
20V, Ultra-Precision, Low-Noise Op Amps; 20V ，超高精度，低噪声运算放大器
| 型号： | MAX44251 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 20V, Ultra-Precision, Low-Noise Op Amps |
| 文件： | 总15页 (文件大小：2327K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-6000; Rev 0; 10/11
General Description
Benefits and Features
The MAX44251/MAX44252 are 20V, ultra-precision, low-
noise, low-drift amplifiers that offer near-zero DC offset
and drift through the use of patented autocorrelating
zeroing techniques. This method constantly measures
and compensates the input offset, eliminating drift over
time and temperature and the effect of 1/f noise. These
dual and quad devices feature rail-to-rail outputs, oper-
ate from a single 2.7V to 20V supply, and consume only
1.15mA per channel, while providing 5.9nV/√Hz input-
referred voltage noise. The ICs are unity-gain stable with
a gain-bandwidth product of 10MHz.
S 2.7V to 20V Power-Supply Range
S Integrated EMI Filter
S 6µV Input Offset Voltage (max) at Room
Temperature
S TCV
of 19nV/°C (max)
OS
S Low 5.9nV/√Hz Input-Referred Voltage Noise
S 123nV in 0.1Hz to 10Hz
P-P
S Fast 400ns Settling Time
S 10MHz Gain-Bandwidth Product
S Rail-to-Rail Output
With excellent specifications such as offset voltage of
6µV (max), drift of 19nV/°C (max), and 123nV
noise in
P-P
S High Accuracy Enables Precision Signal Chain
0.1Hz to 10Hz, the ICs are ideally suited for applications
requiring ultra-low noise and DC precision such as inter-
facing with pressure sensors, strain gauges, precision
weight scales, and medical instrumentation.
Acquisition
Applications
Strain Gauges
Pressure Transducers
Medical Instrumentation
M
The ICs are available in 8-pin SOT23, 8-pin µMAX ,
and 14-pin SOIC packages and are rated over the
-40°C to +125°C temperature range.
Precision Instrumentation
Load Cell and Bridge Transducer Amplification
Ordering Information appears at end of data sheet.
Functional Diagrams appear at end of data sheet.
For related parts and recommended products to use with this part,
refer to www.maxim-ic.com/MAX44251.related.
Typical Operating Circuit
3.3V
20V
3V
MAX44251
V
OUT
R
BUFFER
R
1
MAX6126
20V
V
DD
20V
R
R
V
V
REF
DD
50R
50R
G
V
BUFFER
IN+
R
G
MICRO-
G
PROCESSOR
OUTPUT
MAX11211
V
20V
IN-
V
SS
R
MAX44251
BUFFER
1.5V
C
1
MAX44251
µMAX is a registered trademark of Maxim Integrated Products, Inc.
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1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX44251/MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
to V ).................................-0.3V to +22V
Operating Temperature Range........................ -40°C to +125NC
Junction Temperature .....................................................+150NC
Storage Temperature Range............................ -65°C to +150NC
Lead Temperature (soldering, 10s) .............................. +300NC
Soldering Temperature (reflow) .................................... +260NC
DD
SS
All Other Pins..................................(V - 0.3V) to (V
+ 0.3V)
SS
DD
Short-Circuit Duration to Either Supply Rail............................ 1s
Continuous Input Current (any pin)................................. 20mA
Differential Input Voltage...................................................... 6V
Maximum Power Dissipation (T = +70°C)
A
SOT23 (derate 9.1 mW/°C above +70°C)...................727mW
µMAX (derate 4.5 mW/°C above +70°C) ....................362mW
SOIC (derate 8.3 mW/°C above +70°C) ..................666.7mW
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 1)
SOT23
SOIC
Junction-to-Ambient Thermal Resistance (Θ ) ....... 196°C/W
Junction-to-Ambient Thermal Resistance (Θ ) ........120°C/W
JA
JA
Junction-to-Case Thermal Resistance (Θ )...............70°C/W
Junction-to-Case Thermal Resistance (Θ )...............37°C/W
JC
JC
µMAX
Junction-to-Ambient Thermal Resistance (Θ ) ........221°C/W
JA
Junction-to-Case Thermal Resistance (Θ )...............42°C/W
JC
Note 1: 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.maxim-ic.com/thermal-tutorial.
ELECTRICAL CHARACTERISTICS
(V
= 10V, V = 0V, V
= V = V /2, R = 10kI to V /2, T = -40°C to +125°C, unless otherwise noted. Typical values are
DD
SS
IN+
IN-
DD
L
DD
A
at +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
POWER SUPPLY
Supply Voltage Range
V
Guaranteed by PSRR
= 2.7V to 20V, V
2.7
20
V
DD
Power-Supply Rejection Ratio
(Note 3)
PSRR
V
= 0V
CM
140
145
dB
DD
T
= +25NC
1.15
1.55
1.75
A
Quiescent Current per Amplifier
I
R = J
mA
DD
L
-40NC < T < +125NC
A
Power-Up Time
t
25
Fs
ON
DC SPECIFICATIONS
V
0.05
-
V
1.5
-
SS
DD
Input Common-Mode Range
V
Guaranteed by CMRR test
= +25NC, V = -0.05V to (V -
DD
V
CM
T
A
CM
133
130
140
Common-Mode Rejection Ratio
(Note 3)
1.5V)
CMRR
dB
-40NC < T < +125NC
A
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2
MAX44251/MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
ELECTRICAL CHARACTERISTICS (continued)
(V
= 10V, V = 0V, V
= V = V /2, R = 10kI to V /2, T = -40°C to +125°C, unless otherwise noted. Typical values are
DD
SS
IN+
IN-
DD
L
DD
A
at +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
T
= +25NC
3
6
7
A
Input Offset Voltage (Note 3)
V
FV
OS
-40NC < T < +125NC
A
Input Offset Voltage Drift
(Note 3)
TC V
5
19
nV/NC
OS
T
= +25NC
200
1300
2400
A
Input Bias Current (Note 3)
Input Offset Current (Note 3)
I
pA
pA
B
-40NC < T < +125NC
A
I
400
154
OS
250mV PV
PV
R = 10kIto
V
OUT
T
= +25NC
145
136
A
- 250mV,
DD
Open-Loop Gain (Note 3)
A
dB
VOL
L
-40NC < T < +125NC
A
/2
DD
Output Short-Circuit Current
Output Voltage Low
To V
or V
Noncontinuous
96
12
45
18
71
mA
mV
DD
SS
R = 10kIto V /2
25
85
L
DD
V
V - V
OUT SS
OL
R = 2kIto V /2
L
DD
R = 10kIto V /2
37
L
DD
Output Voltage High
V
V
- V
mV
OH
DD
OUT
R = 2kIto V /2
135
L
DD
AC SPECIFICATIONS
Input Voltage-Noise Density
Input Voltage Noise
Input Current-Noise Density
Input Capacitance
e
f = 1kHz
5.9
123
0.6
2
nV/√Hz
N
0.1Hz < f < 10Hz
f = 1kHz
nV
P-P
i
pA/√Hz
pF
N
C
IN
Gain-Bandwidth Product
Phase Margin
GBW
PM
10
60
8
MHz
Degrees
V/Fs
C = 20pF
L
Slew Rate
SR
A = 1V/V, V
= 2V
P-P
V
OUT
Capacitive Loading
C
No sustained oscillation, A = 1V/V
500
pF
L
V
V
= 2V
,
OUT
P-P
f = 1kHz
-124
A = +1V/V,
V
Total Harmonic Distortion
Settling Time
THD
dB
ns
R = 10kIto
L
f = 20kHz
-119
400
V
/2
DD
To 0.01%, V
= 2V step, A = -1V/V
V
OUT
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3
MAX44251/MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
ELECTRICAL CHARACTERISTICS
(V
= 3.3V, V = 0V, V
= V = V /2, R = 10kI to V /2, T = -40°C to +125°C, unless otherwise noted. Typical values
DD
SS
IN+ IN- DD L DD A
are at +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
1.1
25
MAX
UNITS
POWER SUPPLY
T
= +25NC
1.5
A
Quiescent Current per Amplifier
I
R = J
mA
DD
L
-40NC < T < +125NC
1.65
A
Power-Up Time
t
Fs
ON
DC SPECIFICATIONS
V
-
V
1.5
-
DD
SS
Input Common-Mode Range
V
Guaranteed by CMRR test
= +25NC, V = -0.05V to (V -
DD
V
CM
0.05
120
117
T
A
CM
129
3
Common-Mode Rejection Ratio
(Note 3)
1.5V)
CMRR
dB
-40NC < T < +125NC
A
T
= +25NC
5.5
6.5
A
Input Offset Voltage (Note 3)
V
FV
OS
-40NC < T < +125NC
A
Input Offset Voltage Drift
(Note 3)
TC V
8
18
nV/NC
OS
T
= +25NC
200
1100
1200
A
Input Bias Current (Note 3)
Input Offset Current (Note 3)
I
pA
pA
B
-40NC < T < +125NC
A
I
400
151
OS
250mV PV
PV
R = 10kIto
V
OUT
T
= +25NC
136
133
A
- 250mV,
DD
Open-Loop Gain (Note 3)
A
dB
VOL
L
-40NC < T < +125NC
A
/2
DD
Output Short-Circuit Current
Output Voltage Low
To V
or V
Noncontinuous
58
5
mA
mV
DD
SS
R = 10kIto V /2
22
42
22
52
L
DD
V
V - V
OUT SS
OL
R = 2kIto V /2
17
9
L
DD
R = 10kIto V /2
L
DD
Output Voltage High
V
V
- V
mV
OH
DD
OUT
R = 2kIto V /2
29
L
DD
AC SPECIFICATIONS
Input Voltage-Noise Density
Input Voltage Noise
e
f = 1kHz
6.2
123
0.3
2
nV/√Hz
N
0.1Hz < f < 10Hz
f = 1kHz
nV
P-P
Input Current-Noise Density
Input Capacitance
i
N
pA/√Hz
pF
C
IN
Gain-Bandwidth Product
GBW
10
MHz
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4
MAX44251/MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
ELECTRICAL CHARACTERISTICS (continued)
(V
= 3.3V, V = 0V, V
= V = V /2, R = 10kIto V /2, T = -40°C to +125°C, unless otherwise noted. Typical values are
IN+ IN- DD L DD A
DD
SS
at +25°C.) (Note 2)
PARAMETER
SYMBOL
PM
CONDITIONS
MIN
TYP
60
MAX
UNITS
Degrees
V/Fs
Phase Margin
Slew Rate
C = 20pF
L
SR
A = 1V/V, V
= 1V , 10% to 90%
5
V
OUT
P-P
Capacitive Loading
C
No sustained oscillation, A = 1V/V
500
pF
L
V
V
= 1V
,
OUT
P-P
f = 1kHz
-124
A = +1V/V,
V
Total Harmonic Distortion
THD
V
= V /4,
dB
ns
CM
DD
R = 10kIto
L
f = 20kHz
-100
200
V
/2
DD
Settling Time
To 0.01%, V
= 1V step, A = -1V/V
V
OUT
Note 2: All devices are 100% production tested at T = +25°C. Temperature limits are guaranteed by design.
A
Note 3: Guaranteed by design.
Typical Operating Characteristics
(V
= 10V, V = 0V, outputs have R = 10kIto V /2. T = +25NC, unless otherwise specified.)
SS L DD A
DD
OFFSET VOLTAGE HISTOGRAM
SUPPLY CURRENT vs. SUPPLY VOLTAGE
INPUT OFFSET VOLTAGE DRIFT HISTOGRAM
16
25
20
15
10
5
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
T = +125°C
A
T = +85°C
A
14
12
10
8
T = +25°C
A
T = 0°C
A
T = -40°C
A
6
4
SUPPLY CURRENT
PER AMPLIFIER
2
0
0
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
OFFSET VOLTAGE (µV)
0
5
10
15
20
25
-0.001
0.001
0.003
0.005
0
0.002
0.004
0.006
SUPPLY VOLTAGE (V)
OFFSET VOLTAGE DRIFT (µV/°C)
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5
MAX44251/MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
Typical Operating Characteristics (continued)
(V
= 10V, V = 0V, outputs have R = 10kIto V /2. T = +25NC, unless otherwise specified.)
DD
SS
L
DD
A
INPUT OFFSET VOLTAGE
vs. INPUT COMMON MODE
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
SUPPLY CURRENT vs. TEMPERATURE
1.28
6
5
4
3
2
1
0
6
5
4
3
2
1
0
1.26
1.24
1.22
1.20
1.18
1.16
1.14
1.12
1.10
1.08
1.06
SUPPLY CURRENT
PER AMPLIFIER
-50 -25
0
25 50 75 100 125 150
TEMPERATURE (°C)
0
2
4
6
8
10
-50
-25
0
25
50
75
100
125
INPUT COMMON VOLTAGE (V)
TEMPERATURE (°C)
INPUT BIAS CURRENT
vs. INPUT COMMON-MODE VOLTAGE
INPUT BIAS CURRENT
vs. TEMPERATURE
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
250
200
150
100
50
1000
750
160
140
120
100
80
POSITIVE I
BIAS
500
NEGATIVE I
BIAS
250
0
0
-250
-500
-750
-1000
-1250
60
-50
40
-100
-150
-200
-250
POSITIVE I
BIAS
NEGATIVE I
BIAS
20
0
-20
0
2
4
6
8
10
-50 -25
0
25 50 75 100 125 150
TEMPERATURE (°C)
0.1
1
10 100 1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
V
(V)
CM
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6
MAX44251/MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
Typical Operating Characteristics (continued)
(V
= 10V, V = 0V, outputs have R = 10kIto V /2. T = +25NC, unless otherwise specified.)
DD
SS
L
DD
A
COMMON-MODE REJECTION RATIO
vs. TEMPERATURE
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
OUTPUT VOLTAGE SWING HIGH
vs. TEMPERATURE
160
140
120
100
80
160
35
30
25
20
15
10
5
140
120
100
80
60
40
20
0
V
= 0V
R = 10kI to V /2
-20
-40
CM
L
DD
60
0
-50
-25
0
25
50
75
100
125
0.1
1
10 100 1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
-50 -25
0
25 50 75 100 125 150
TEMPERATURE (°C)
TEMPERATURE (°C)
OUTPUT VOLTAGE SWING LOW
vs. TEMPERATURE
OPEN-LOOP GAIN vs. FREQUENCY
INPUT VOLTAGE NOISE vs. FREQUENCY
18
16
14
12
10
8
180
160
30
25
20
15
10
5
140
120
100
80
60
40
20
6
0
4
-20
-40
-60
2
R = 10kI to V /2
L
DD
0
0
-50 -25
0
25 50 75 100 125 150
TEMPERATURE (°C)
0.1
1
10 100 1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
10
100
1k
10k
100k
FREQUENCY (Hz)
INPUT VOLTAGE 0.1Hz TO 10Hz NOISE
INPUT CURRENT NOISE vs. FREQUENCY
SMALL-SIGNAL RESPONSE
MAX44251 toc16
6
5
4
3
2
1
0
2
0
-2
-4
-6
0.2µV/div
-8
-10
-12
-14
-16
-18
V
= 100mV
P-P
IN
1s/div
1
10
100
1k
10k
1
10 100 1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
FREQUENCY (Hz)
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7
MAX44251/MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
Typical Operating Characteristics (continued)
(V
= 10V, V = 0V, outputs have R = 10kIto V /2. T = +25NC, unless otherwise specified.)
DD
SS
L
DD
A
LARGE-SIGNAL RESPONSE
SMALL-SIGNAL STEP RESPONSE
vs. TIME
LARGE-SIGNAL STEP RESPONSE
vs. TIME
5
0
MAX44251 toc20
MAX44251 toc21
A
V
= 1V/V
A
V
= 1V/V
-5
V
V
= 100mV
= 2V
IN
P-P
IN
P-P
-10
-15
-20
-25
-30
-35
-40
-45
-50
INPUT
INPUT
OUTPUT
OUTPUT
V
= 2V
P-P
IN
0.1
1
10 100 1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
TIME (2µs/div)
TIME (2µs/div)
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
TOTAL HARMONIC DISTORTION
vs. INPUT VOLTAGE
POWER-UP TIME
MAX44251 toc22
-100
-105
-110
-115
-120
-125
-130
-135
-140
0
-20
SUPPLY
VOLTAGE
(5V/div)
V
= 5V
DD
V
= 3.3V
CC
V
= V = 0V
SS
DD
0V
-40
V
SS
= 5V
-60
-80
-100
-120
-140
0V
V
OFFSET
(10mV/div)
100
1k
10k
100k
0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00
INPUT VOLTAGE (V)
25µs
TIME (10µs/div)
FREQUENCY (Hz)
STABILITY vs. CAPACITIVE AND
RESISTIVE LOAD IN PARALLEL WITH C
STABILITY vs. CAPACITIVE AND
R
IN SERIES WITH C
L
ISO
LOAD
100
90
80
70
60
50
40
30
20
10
0
8
7
6
5
4
3
2
1
0
STABLE
STABLE
UNSTABLE
UNSTABLE
100
1k
CAPACITIVE LOAD (pF)
10k
100
1k
10k
100k
CAPACITIVE LOAD (pF)
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8
MAX44251/MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
Pin Configurations
TOP VIEW
+
OUTA
INA-
1
2
3
4
5
6
7
14 OUTD
13 IND-
12 IND+
+
MAX44252
OUTA
INA-
1
2
3
4
8
7
6
5
V
DD
+
INA+
OUTA
INA-
1
2
3
4
8
7
6
5
V
DD
OUTB
INB-
OUTB
INB-
MAX44251
V
DD
11 V
SS
MAX44251
INA+
INA+
INB+
INB-
10 INC+
V
SS
INB+
V
SS
INB+
9
8
INC-
8 µMAX
8 SOT23
OUTB
OUTC
14 SOIC
Pin Description
PIN
NAME
FUNCTION
SOT23
µMAX
1
SOIC
1
1
2
OUTA
INA-
Channel A Output
2
2
Channel A Negative Input
Channel A Positive Input
Negative Supply Voltage
Channel B Positive Input
Channel B Negative Input
Channel B Output
3
3
3
INA+
4
4
11
5
V
SS
INB+
INB-
5
5
6
6
6
7
7
7
OUTB
8
8
4
V
Positive Supply Voltage
Channel C Output
DD
—
—
—
—
—
—
—
—
—
—
—
—
8
OUTC
INC-
9
Channel C Negative Input
Channel C Positive Input
Channel D Positive Input
Channel D Negative Input
Channel B Output
10
12
13
14
INC+
IND+
IND-
OUTD
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9
MAX44251/MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
Detailed Description
Applications Information
The MAX44251/MAX44252 are high-precision amplifiers
that have less than 3FV of typical input-referred offset
and low flicker noise. These characteristics are achieved
through an autozeroing technique that samples and finds
repeating patterns of signal to cancel the input offset volt-
age and 1/f noise of the amplifier.
The ICs are ultra-high-precision operational amplifiers with
a high supply voltage range designed for load cell, medi-
cal instrumentation and precision instrument applications.
These devices are also designed to interface with pres-
sure transducers and are ideal for precision weight scale
application as shown in Figure 1.
Autozero
The ICs feature an autozero circuit that allows the devices
to achieve less than 6FV (max) of input offset voltage at
room temperature and eliminate the 1/f noise.
ADC Buffer Amplifier
The MAX44251/MAX44252's low input offset voltage, low
noise, and fast settling time make these amplifiers ideal
for ADC buffers. Weigh scales are one application that
often require a low-noise, high-voltage amplifier in front
of an ADC. Figure 1 details an example of a load cell and
amplifier driven from the same Q10V supplies, along with
the MAX11211 18-bit delta sigma ADC. Load cells pro-
duce a very small voltage change at their outputs, there-
fore driving the excitation source with a higher voltage
produces a wider dynamic range that can be measured
at the ADC inputs.
Noise Suppression
Flicker noise, inherent in all active devices, is inversely
proportional to frequency presented. 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.
Electromagnetic interference (EMI) noise occurs at high-
er frequency that results in malfunction or degradation of
electrical equipment.
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 ICs have an input EMI filter to avoid the output get-
ting affected by radio frequency interference. The EMI
filter composed of passive devices presents significant
higher impedance to higher frequency.
High Supply Voltage Range
The ICs feature 1.15mA current consumption per channel
and a voltage supply range from either 2.7V to 20V single
supply or 1.35V to 10V split supply.
The MAX44251/MAX44252's low input offset voltage and
low noise allow a gain circuit prior to the MAX11211 with-
out losing any dynamic range at the ADC.
3.3V
20V
3V
MAX44251
V
OUT
R
BUFFER
R
1
MAX6126
20V
V
DD
20V
R
R
V
V
REF
DD
50R
50R
G
V
BUFFER
IN+
R
G
MICRO
G
PROCESSOR
OUTPUT
MAX11211
V
IN-
20V
V
SS
R
MAX44251
BUFFER
1.5V
C
1
MAX44251
Figure 1. Weight Scale Application Circuit
���������������������������������������������������������������� Maxim Integrated Products 10
MAX44251/MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
Error Budget Example
When using the ICs as an ADC buffer in strain gauge
Chip Information
application, the temperature drift should be taken into
consideration to determine maximum input signal. A
typical strain gauge has sensitivity specification of just
2mV/V at rated out load. This means that when the strain
gauge load cell is powered with 10V, the full-scale output
voltage is 20mV. In this application, both offset voltage
and drift are critical parameters that directly affect the
accuracy of measurement. Even though offset voltage
could be calibrated out, its drift over temperature is still
a problem.
PROCESS: BiCMOS
Ordering Information
PIN-
TOP
PART
TEMP RANGE
PACKAGE
MARK
MAX44251AKA+
MAX44251AUA+
MAX44252ASD+*
-40NC to +125NC 8 SOT23
-40NC to +125NC 8 FMAX
-40NC to +125NC 14 SOIC
AERC
—
—
The ICs, with a typical offset drift of 5nV/°C, guarantee
that the drift over a 10°C range is only 50nV. Setting this
equal to 0.5 LSB in a 18-bit system yields a full-scale
range of 13mV. With a single 10V supply, an acceptable
closed-loop gain of 770V/V provides sufficient gain while
maintaining headroom.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*Future product—contact factory for availability.
Functional Diagrams
Precision Low-Side Current Sensing
The ICs’ autozero feature produces ultra-low offset
voltage and drift, making them ideal for precision cur-
rent-sensing applications. Figure 2 shows the ICs in
a low-side current-sense configuration. This circuit pro-
TOP VIEW
+
OUTA
INA-
1
2
3
4
8
7
6
5
V
DD
MAX44251
OUTB
INB-
INA+
duces an accurate output voltage, V
equal to I
OUT
LOAD
x R
x R /R .
V
INB+
SENSE
2
1
SS
+
V
SUPPLY
OUTA
INA-
1
2
3
4
5
6
7
14 OUTD
13 IND-
12 IND+
R
2
I
LOAD
R
INA+
1
V
DD
11
V
SS
MAX44252
OUT
R
SENSE
INB+
INB-
10 INC+
MAX44251
MAX44252
9
8
INC-
OUTB
OUTC
Figure 2. Low-Side Current Sensing
���������������������������������������������������������������� Maxim Integrated Products 11
MAX44251/MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
Package Information
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.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
8 SOT23
PACKAGE CODE
K8+5
OUTLINE NO.
21-0078
LAND PATTERN
90-0176
8 FMAX
U8+1
21-0036
90-0092
14 SOIC
S14M+5
21-0041
90-0096
���������������������������������������������������������������� Maxim Integrated Products 12
MAX44251/MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
Package Information (continued)
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.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.
α
α
���������������������������������������������������������������� Maxim Integrated Products 13
MAX44251/MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
Package Information (continued)
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.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.
���������������������������������������������������������������� Maxim Integrated Products 14
MAX44251/MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
Revision History
REVISION REVISION
PAGES
DESCRIPTION
CHANGED
NUMBER
DATE
0
10/11
Initial release
—
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.
Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
15
©
2011 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
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