MAX44250_V01 [MAXIM]
20V, Ultra-Precision, Low-Noise Op Amps;
| 型号： | MAX44250_V01 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 20V, Ultra-Precision, Low-Noise Op Amps |
| 文件： | 总14页 (文件大小：1150K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MAX44250/MAX44251/
MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
General Description
Benefits and Features
● High Accuracy Enables Precision Signal Chain
The MAX44250/MAX44251/MAX44252 are 20V, ultra-
precision, low-noise, low-drift amplifiers that offer near-
zero DC offset and drift through the use of patented auto-
correlating 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 single, dual, and quad devices feature rail-to-rail
outputs, operate from a single 2.7V to 20V supply or dual
±1.35V to ±10V supplies 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.
Acquisition
• 6μV Input Offset Voltage (max) at Room
Temperature
• TCV
of 19nV/°C (max)
OS
• Low 5.9nV/√Hz Input-Referred Voltage Noise
• 123nV in 0.1Hz to 10Hz
P-P
• 10MHz Gain-Bandwidth Product
• Rail-to-Rail Output
• Fast 400ns Settling Time
● 2.7V to 20V Power-Supply Range Supports
Wide Range of Sensors
With excellent specifications such as offset voltage of
● Integrated EMI Filter Reduces Impact of Radio
6µV (max), drift of 19nV/°C (max), and 123nV
noise in
P-P
Frequency Interference on Signal Chain Performance
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.
Applications
● Strain Gauges
● Pressure Transducers
The ICs are available in 5-pin SOT23, 8-pin SOT23, 8-pin
µMAX®, and 14-pin SO packages and are rated over the
-40°C to +125°C temperature range.
● Medical Instrumentation
● Precision Instrumentation
● Load Cell and Bridge Transducer Amplification
Functional Diagrams appear at end of data sheet.
Ordering Information appears at end of data sheet.
Typical Operating Circuit
3.3V
+10V
3V
MAX44251
V
OUT
R
BUFFER
R
1
MAX6126
10V
V
DD
+10V
-10V
R
V
V
REF
DD
50R
50R
G
MAX44251
R
V
BUFFER
-10V
IN+
R
G
MICRO-
G
PROCESSOR
OUTPUT
MAX11211
V
+10V
IN-
V
SS
R
BUFFER
1.5V
C
1
MAX44251
-10V
µMAX is a registered trademark of Maxim Integrated Products, Inc.
19-6000; Rev 6; 1/17
MAX44250/MAX44251/
MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
Absolute Maximum Ratings
Supply Voltage (V
All Other Pins..................................(V - 0.3V) to (V
Short-Circuit Duration to Either Supply Rail............................ 1s
Continuous Input Current (any pin)................................. ±20ꢀA
Differential Input Voltage...................................................... ±±V
Maxiꢀuꢀ Power Dissipation (T = +70°C)
5-Pin SOT23 (derate 3.1ꢀW/°C above +70°C)........24±.7ꢀW
8-Pin SOT23 (derate 9.1ꢀW/°C above +70°C)...........727ꢀW
to V ).................................-0.3V to +22V
µMAX (derate 4.5 ꢀW/°C above +70°C) ....................3±2ꢀW
SO (derate 8.3 ꢀW/°C above +70°C)......................±±±.7ꢀW
Operating Teꢀperature Range........................ -40°C to +125NC
Junction Teꢀperature .....................................................+150NC
Storage Teꢀperature Range............................ -±5°C to +150NC
Lead Teꢀperature (soldering, 10s) .............................. +300NC
Soldering Teꢀperature (reflow) .................................... +2±0NC
DD
SS
+ 0.3V)
SS
DD
A
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)
5-Pin SOT23
Junction-to-Aꢀbient Therꢀal Resistance (Θ ) .... 324.3°C/W
µMAX
Junction-to-Aꢀbient Therꢀal Resistance (Θ ) ........221°C/W
JA
JA
Junction-to-Case Therꢀal Resistance (Θ )...............82°C/W
Junction-to-Case Therꢀal Resistance (Θ )...............42°C/W
JC
JC
8-Pin SOT23
SO
Junction-to-Aꢀbient Therꢀal Resistance (Θ ) ........120°C/W
Junction-to-Aꢀbient Therꢀal Resistance (Θ ) ....... 19±°C/W
JA
JA
Junction-to-Case Therꢀal Resistance (Θ )...............70°C/W
Junction-to-Case Therꢀal Resistance (Θ )...............37°C/W
JC
JC
Note 1: Package therꢀal resistances were obtained using the ꢀethod described in JEDEC specification JESD51-7, using a four-layer
board. For detailed inforꢀation on package therꢀal considerations, refer to www.maximintegrated.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 T = +25°C.) (Note 2)
A
PARAMETER
POWER SUPPLY
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
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
1.22
1.7
Quiescent Current per Aꢀplifier
(MAX44250)
A
I
R = J
ꢀA
DD
L
-40NC < T < +125NC
1.85
1.55
1.75
A
T
= +25NC
1.15
25
Quiescent Current per Aꢀplifier
(MAX44251/MAX44252)
A
I
R = J
ꢀA
DD
ON
L
-40NC < T < +125NC
A
Power-Up Tiꢀe
t
Fs
DC SPECIFICATIONS
V
0.05
-
V
1.5
-
SS
DD
Input Coꢀꢀon-Mode Range
V
Guaranteed by CMRR test
= +25NC, V = -0.05V to (V -
DD
V
CM
T
A
CM
133
130
140
3
Coꢀꢀon-Mode Rejection Ratio
(Note 3)
1.5V)
CMRR
dB
FV
-40NC < T < +125NC
A
Input Offset Voltage
(MAX44250) (Note 3)
V
T = +25NC
A
9
OS
Maxim Integrated
│ 2
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MAX44250/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 T = +25°C.) (Note 2)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
T
= +25NC
3
±
7
Input Offset Voltage (MAX44251/
MAX44252)(Note 3)
A
V
FV
OS
-40NC < T < +125NC
A
Input Offset Voltage Drift
(MAX44250) (Note 3)
TC V
TC V
5
5
2±
nV/NC
OS
Input Offset Voltage Drift
(MAX44251/MAX44252)(Note 3)
19
nV/NC
OS
Input Bias Current (MAX44250)
(Note 3)
I
I
T
T
= +25NC
= +25NC
200
200
1400
pA
B
B
A
A
1300
2400
Input Bias Current (MAX44251/
MAX44252)(Note 3)
pA
pA
-40NC < T < +125NC
A
Input Offset Current (Note 3)
Open-Loop Gain (Note 3)
Output Short-Circuit Current
I
400
154
OS
250ꢀV P V
V
R = 10kI to
V
P
OUT
T
= +25NC
145
13±
A
- 250ꢀV,
DD
A
dB
VOL
L
-40NC < T
+125NC
<
A
/2
DD
To V
or V
Noncontinuous
9±
12
45
12
45
18
71
18
71
ꢀA
ꢀV
DD
SS
R = 10kI to V /2
2±
92
Output Voltage Low
(MAX44250)
L
DD
V
V
V
V
V
- V
OL
OL
OH
OH
OUT
SS
SS
R = 2kI to V /2
L
DD
R = 10kI to V /2
25
Output Voltage Low
(MAX44251/MAX44252)
L
DD
V
- V
ꢀV
ꢀV
ꢀV
OUT
R = 2kI to V /2
85
L
DD
R = 10kI to V /2
40
Output Voltage High
(MAX44250)
L
DD
V
V
- V
DD
DD
OUT
OUT
R = 2kI to V /2
148
37
L
DD
R = 10kI to V /2
Output Voltage High
(MAX44251/MAX44252)
L
DD
- V
R = 2kI to 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.±
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
±0
8
MHz
Degrees
V/Fs
C = 20pF
L
Slew Rate
SR
A = 1V/V, V
= 2V
V
OUT P-P
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 Harꢀonic Distortion
Settling Tiꢀe
THD
dB
ns
R = 10kI to
L
f = 20kHz
-119
400
V
/2
DD
To 0.01%, V
= 2V step, A = -1V/V
V
OUT
Maxim Integrated
│ 3
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MAX44250/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 are
IN+ IN- DD L DD A
DD
SS
at T = +25°C.) (Note 2)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
1.17
1.1
MAX
UNITS
POWER SUPPLY
T
= +25NC
1.±5
1.80
1.5
Quiescent Current Per Aꢀplifier
(MAX44250)
A
I
I
R = J
ꢀA
DD
L
-40NC < T < +125NC
A
T
= +25NC
Quiescent Current Per Aꢀplifier
(MAX44251/MAX44252))
A
R = J
ꢀA
DD
ON
L
-40NC < T < +125NC
1.±5
A
Power-Up Tiꢀe
t
25
Fs
DC SPECIFICATIONS
V
-
V
1.5
-
DD
SS
Input Coꢀꢀon-Mode Range
V
Guaranteed by CMRR test
= +25NC, V = -0.05V to (V -
DD
V
CM
0.05
120
117
T
A
CM
129
Coꢀꢀon-Mode Rejection Ratio
(Note 3)
1.5V)
CMRR
dB
-40NC < T < +125NC
A
Input Offset Voltage
(MAX44250)(Note 3)
V
V
3
3
8.5
FV
OS
T
= +25NC
5.5
±.5
Input Offset Voltage (MAX44251/
MAX44252)(Note 3)
A
FV
OS
-40NC < T < +125NC
A
Input Offset Voltage Drift
(MAX44250)(Note 3)
TC V
TC V
8
8
25
18
nV/NC
OS
Input Offset Voltage Drift
(MAX44251/MAX44252)(Note 3)
nV/NC
OS
Input Bias Current
(MAX44250)(Note 3)
I
I
200
200
1450
pA
B
B
T
= +25NC
1100
1200
Input Bias Current (MAX44251/
MAX44252)(Note 3)
A
pA
pA
-40NC < T < +125NC
A
Input Offset Current (Note 3)
Open-Loop Gain (Note 3)
Output Short-Circuit Current
I
400
151
OS
250ꢀV P V
P V
R = 10kI to
V
OUT
T
= +25NC
13±
133
A
- 250ꢀV,
DD
A
dB
VOL
L
-40NC < T < +125NC
A
/2
DD
To V
or V
Noncontinuous
58
5
ꢀA
ꢀV
DD
SS
R = 10kI to V /2
2±
4±
22
42
22
52
Output Voltage Low
(MAX44250)
L
DD
V
V
V
V
- V
OL
OL
OH
OUT
SS
SS
R = 2kI to V /2
17
5
L
DD
R = 10kI to V /2
Output Voltage Low
(MAX44251/MAX44252)
L
DD
V
- V
ꢀV
ꢀV
OUT
R = 2kI to V /2
17
9
L
DD
R = 10kI to V /2
L
DD
Output Voltage High
V
- V
DD OUT
R = 2kI to V /2
29
L
DD
Maxim Integrated
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MAX44250/MAX44251/
MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
Electrical Characteristics (continued)
(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 are
IN+ IN- DD L DD A
DD
SS
at T = +25°C.) (Note 2)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
AC SPECIFICATIONS
Input Voltage-Noise Density
Input Voltage Noise
Input Current-Noise Density
Input Capacitance
Gain-Bandwidth Product
Phase Margin
e
f = 1kHz
±.2
123
0.3
2
nV/√Hz
N
0.1Hz < f < 10Hz
f = 1kHz
nV
P-P
i
pA/√Hz
pF
N
C
IN
GBW
PM
10
±0
5
MHz
Degrees
V/Fs
C = 20pF
L
Slew Rate
SR
A = 1V/V, V
= 1V , 10% to 90%
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 Harꢀonic Distortion
Settling Tiꢀe
THD
V
= V /4,
dB
ns
CM
DD
R = 10kI to
L
f = 20kHz
-100
200
V
/2
DD
To 0.01%, V
= 1V step, A = -1V/V
V
OUT
Note 2: All devices are 100% production tested at T = +25°C. Teꢀperature liꢀits are guaranteed by design.
A
Note 3: Guaranteed by design.
Typical Operating Characteristics
(V
= 10V, V = 0V, outputs have R = 10kI to V /2. T = +25NC, unless otherwise specified.)
SS L DD A
DD
OFFSET VOLTAGE HISTOGRAM
INPUT OFFSET VOLTAGE DRIFT HISTOGRAM
SUPPLY CURRENT vs. SUPPLY VOLTAGE
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
45
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
T = +125°C
T = +85°C
A
A
40
35
30
25
20
15
10
5
T = +25°C
A
T = 0°C
A
T = -40°C
A
SUPPLY CURRENT
PER AMPLIFIER
0
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
OFFSET VOLTAGE (µV)
-0.001
0
0.001 0.002 0.003 0.004 0.005 0.006
0
5
10
15
20
25
OFFSET VOLTAGE DRIFT (µV/°C)
SUPPLY VOLTAGE (V)
Maxim Integrated
│
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MAX44250/MAX44251/
MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
Typical Operating Characteristics (continued)
(V
= 10V, V = 0V, outputs have R = 10kI to 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. COMMON-MODE VOLTAGE
INPUT BIAS CURRENT
vs. TEMPERATURE
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
2000
1500
1000
500
1000
750
160
T = +125°C
A
140
120
100
80
I
BIAS-
T = -40°C
A
POSITIVE I
BIAS
500
T = +25°C
A
250
0
-250
-500
-750
-1000
-1250
60
0
40
-500
-1000
-1500
NEGATIVE I
BIAS
20
0
I
BIAS+
-20
-5 -4 -3 -2 -1
0
1
2
3
4
-50 -25
0
25 50 75 100 125 150
TEMPERATURE (°C)
0.1
1
10 100 1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
INPUT COMMON-MODE VOLTAGE (V)
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MAX44250/MAX44251/
MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
Typical Operating Characteristics (continued)
(V
= 10V, V = 0V, outputs have R = 10kI to V /2. T = +25NC, unless otherwise specified.)
SS L DD A
DD
OUTPUT VOLTAGE SWING HIGH
vs. TEMPERATURE
OUTPUT VOLTAGE HIGH
vs. OUTPUT SOURCE CURRENT (V - V
OUTPUT VOLTAGE LOW
vs. OUTPUT SINK CURRENT
)
DD
OH
35
30
25
20
15
10
5
600
500
400
300
200
100
0
300
250
200
150
100
50
R = 10kI to V /2
L
DD
0
0
-50 -25
0
25 50 75 100 125 150
TEMPERATURE (°C)
0
2
4
6
8
10
0
2
4
6
8
10
OUTPUT SOURCE CURRENT (mA)
OUTPUT SINK CURRENT (mA)
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 CURRENT NOISE vs. FREQUENCY
SMALL-SIGNAL RESPONSE
INPUT VOLTAGE 0.1Hz TO 10Hz NOISE
MAX44250 toc16
6
5
4
3
2
1
0
2
0
-2
-4
-6
-8
0.2µV/div
-10
-12
-14
-16
-18
V
= 100mV
P-P
IN
1
10
100
1k
10k
1
10 100 1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
1s/div
FREQUENCY (Hz)
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MAX44250/MAX44251/
MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
Typical Operating Characteristics (continued)
(V
= 10V, V = 0V, outputs have R = 10kI to V /2. T = +25NC, unless otherwise specified.)
DD
SS
L
DD
A
SMALL-SIGNAL STEP RESPONSE
vs. TIME
LARGE-SIGNAL STEP RESPONSE
vs. TIME
LARGE-SIGNAL RESPONSE
MAX44250 toc20
MAX44250 toc21
5
0
A
V
= 1V/V
A
V
= 1V/V
V
V
= 100mV
= 2V
IN
P-P
IN
P-P
-5
-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. INPUT VOLTAGE
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
POWER-UP TIME
MAX44250 toc22
0
-20
-100
-105
-110
-115
-120
-125
-130
-135
-140
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)
0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00
INPUT VOLTAGE (V)
100
1k
10k
100k
25µs
TIME (10µs/div)
FREQUENCY (Hz)
STABILITY vs. CAPACITIVE AND
RESISTIVE LOAD IN PARALLEL WITH C
STABILITY vs. CAPACITIVE AND
MAX44251 EMIRR
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
80
70
60
50
40
30
20
10
0
STABLE
STABLE
UNSTABLE
UNSTABLE
100
1k
CAPACITIVE LOAD (pF)
10k
100
1k
10k
100k
10
100
1000
10,000
CAPACITIVE LOAD (pF)
FREQUENCY (MHz)
Maxim Integrated
│ 8
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MAX44250/MAX44251/
MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
Pin Configurations
TOP VIEW
+
OUTA
1
2
3
5
4
V
DD
+
N.C.
1
2
3
4
8
7
6
5
N.C.
MAX44250
INA-
INA+
V
DD
V
SS
MAX44250
OUTA
N.C.
V
SS
INA+
INA-
8 µMAX
5 SOT23
+
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
V
DD
OUTB
INB-
7
6
5
OUTB
INB-
MAX44251
V
11 V
SS
DD
MAX44251
INA+
INA+
INB+
INB-
10 INC+
V
SS
INB+
V
INB+
SS
9
8
INC-
8 µMAX
8 SOT23
OUTB
OUTC
14 SO
Pin Description
PIN
MAX44251
NAME
FUNCTION
MAX44250
MAX44252
5 SOT23
8 µMAX
8 SOT23
8 µMAX
14 SO
1
1
±
2
1
2
1
2
OUTA
INA-
Channel A Output
4
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
3
3
INA+
2
4
4
4
11
5
V
SS
—
—
—
5
—
—
—
7
5
5
INB+
INB-
±
±
±
7
7
7
OUTB
8
8
4
V
Positive Supply Voltage
Channel C Output
DD
—
—
—
—
—
—
—
—
—
—
—
—
—
1, 5, 8
—
—
—
—
—
—
—
—
—
—
—
—
—
—
8
OUTC
INC-
9
Channel C Negative Input
Channel C Positive Input
Channel D Positive Input
Channel D Negative Input
Channel D Output
10
12
13
14
—
INC+
IND+
IND-
OUTD
N.C.
No Connection
Maxim Integrated
│ 9
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MAX44250/MAX44251/
MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
Detailed Description
Electroꢀagnetic interference (EMI) noise occurs at high-
er frequency that results in ꢀalfunction or degradation of
electrical equipꢀent.
The MAX44250/MAX44251/MAX44252 are high-preci-
sion aꢀplifiers that have less than 3FV of typical input-
referred offset and low flicker noise. These characteris-
tics are achieved through an autozeroing technique that
saꢀples and finds repeating patterns of signal to cancel
the input offset voltage and 1/f noise of the aꢀplifier.
The ICs have an input EMI filter to avoid the output get-
ting affected by radio frequency interference. The EMI
filter coꢀposed of passive devices presents significant
higher iꢀpedance to higher frequency.
Autozero
High Supply Voltage Range
The ICs feature an autozero circuit that allows the devices
to achieve less than ±FV (ꢀax) of input offset voltage at
rooꢀ teꢀperature and eliꢀinate the 1/f noise.
The ICs feature 1.15ꢀA current consuꢀption per channel
and a voltage supply range froꢀ either 2.7V to 20V single
supply or ±1.35V to ±10V split supply.
Noise Suppression
Applications Information
The ICs are ultra-high-precision operational aꢀplifiers with
a high supply voltage range designed for load cell, ꢀedi-
cal instruꢀentation and precision instruꢀent applications.
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 ꢀore often. For
this reason, flicker noise is also called 1/f noise.
These devices are also designed to interface with pres-
sure transducers and are ideal for precision weight scale
application as shown in Figure 1.
3.3V
+10V
MAX44251
3V
V
OUT
BUFFER
R
R
1
MAX6126
10V
V
DD
-10V
+10V
R
V
V
REF
DD
50R
50R
G
MAX44251
R
V
BUFFER
IN+
R
G
MICRO-
G
PROCESSOR
OUTPUT
MAX11211
V
IN-
-10V
V
+10V
SS
R
1.5V
BUFFER
C
1
MAX44251
-10V
Figure 1. Weight Scale Application Circuit
Maxim Integrated
│ 10
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MAX44250/MAX44251/
MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
ADC Buffer Amplifier
could be calibrated out, its drift over teꢀperature is still
a probleꢀ.
The MAX44250/MAX44251/MAX44252's low input offset
voltage, low noise, and fast settling tiꢀe ꢀake these
aꢀplifiers ideal for ADC buffers. Weigh scales are one
application that often require a low-noise, high-voltage
aꢀplifier in front of an ADC. Figure 1 details an exaꢀple
of a load cell and aꢀplifier driven froꢀ the saꢀe Q10V
supplies, along with the MAX11211 18-bit delta sigꢀa
ADC. Load cells produce a very sꢀall voltage change at
their outputs, therefore driving the excitation source with
a higher voltage produces a wider dynaꢀic range that
can be ꢀeasured at the ADC inputs.
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 systeꢀ yields a full-scale
range of 13ꢀV. With a single 10V supply, an acceptable
closed-loop gain of 770V/V provides sufficient gain while
ꢀaintaining headrooꢀ.
Precision Low-Side Current Sensing
The ICs’ autozero feature produces ultra-low offset
voltage and drift, ꢀaking theꢀ ideal for precision cur-
rent-sensing applications. Figure 2 shows the ICs in
a low-side current-sense configuration. This circuit pro-
The MAX11211 ADC operates froꢀ a single 2.7V to 3.±V
analog supply, offers 18-bit noise-free resolution and
0.8±ꢀW power dissipation. The MAX11211 also offers
> 100dB rejection at 50Hz and ±0Hz. This ADC is part of
a faꢀily of 1±-, 18-, 20-, and 24-bit delta sigꢀa ADCs with
high precision and < 1ꢀW power dissipation.
duces an accurate output voltage, V
equal to I
OUT
LOAD
x R
x (1 + R /R ).
SENSE
2
1
R
2
The MAX44250/MAX44251/MAX44252's low input offset
voltage and low noise allow a gain circuit prior to the
MAX11211 without losing any dynaꢀic range at the ADC.
V
SUPPLY
R
1
I
LOAD
Error Budget Example
When using the ICs as an ADC buffer in strain gauge
application, the teꢀperature drift should be taken into
consideration to deterꢀine ꢀaxiꢀuꢀ input signal. A
typical strain gauge has sensitivity specification of just
2ꢀV/V at rated out load. This ꢀeans that when the strain
gauge load cell is powered with 10V, the full-scale output
voltage is 20ꢀV. In this application, both offset voltage
and drift are critical paraꢀeters that directly affect the
accuracy of ꢀeasureꢀent. Even though offset voltage
OUT
MAX44251
MAX44252
R
SENSE
Figure 2. Low-Side Current Sensing
Maxim Integrated
│ 11
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MAX44250/MAX44251/
MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
Functional Diagrams
TOP VIEW
+
+
OUTA
INA-
1
2
3
4
8
7
6
5
V
DD
OUT
1
2
3
5
4
V
DD
MAX44251
OUTB
INB-
V
SS
INA+
V
SS
INB+
IN+
IN-
MAX44250
+
OUTA
INA-
1
2
3
4
5
6
7
14 OUTD
13 IND-
12 IND+
+
N.C.
IN-
1
8
7
6
5
N.C.
VDD
OUT
N.C.
MAX44250
INA+
2
3
4
V
DD
11
V
SS
MAX44252
IN+
INB+
INB-
10 INC+
V
SS
9
8
INC-
OUTB
OUTC
Chip Information
PROCESS: BiCMOS
Ordering Information
PIN-
TOP
MARK
PART
TEMP RANGE
PACKAGE
-40NC to +125NC 5 SOT23
-40NC to +125NC 8 FMAX
-40NC to +125NC 8 SOT23
-40NC to +125NC 8 FMAX
-40NC to +125NC 14 SO
MAX44250AUK+
MAX44250AUA+
MAX44251AKA+
MAX44251AUA+
MAX44252ASD+
AFMA
—
AERC
—
—
+Denotes a lead(Pb)-free/RoHS-compliant package.
Maxim Integrated
│ 12
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MAX44250/MAX44251/
MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
Package Information
For the latest package outline inforꢀation and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings ꢀay show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
PACKAGE TYPE
5 SOT23
PACKAGE CODE
U5+1
OUTLINE NO.
21-0057
LAND PATTERN NO.
90-0174
8 SOT23
K8+5
21-0078
90-0176
8 FMAX
U8+1
21-0036
90-0092
14 SO
S14M+5
21-0041
90-0112
Maxim Integrated
│ 13
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MAX44250/MAX44251/
MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
Revision History
REVISION REVISION
PAGES
DESCRIPTION
CHANGED
NUMBER
DATE
10/11
12/11
0
1
Initial release
—
Released the MAX44252 and updated the Typical Operating Characteristics
5, ±, 11
Added the MAX44250 to the data sheet, added MAX44251 EMIRR graph to Typical
Operating Characteristics, and revised Figure 2
2
8/12
1–1±
3
4
5
±
4/13
±/14
5/15
1/17
Updated General Description, Typical Operating Circuit, and Figure 1
Corrected Package Information
1, 10
13
Added the Benefits and Features section
1
Updated Functional Diagraꢀ to fix error
12
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
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 and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2017 Maxim Integrated Products, Inc.
│ 14
相关型号：
MAX44252ASD+T
Operational Amplifier, 4 Func, 6.5uV Offset-Max, BICMOS, PDSO14, ROHS COMPLIANT, SOIC-14
MAXIM
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