MAX44251AUA [MAXIM]
20V, Ultra-Precision, Low-Noise Op Amps;
| 型号： | MAX44251AUA |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 20V, Ultra-Precision, Low-Noise Op Amps |
| 文件： | 总14页 (文件大小：2353K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EVALUATION KIT AVAILABLE
MAX44250/MAX44251/MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
General Description
Benefits and Features
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.ꢀ5V 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.
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
S High Accuracy Enables Precision Signal Chain
6µV (max), drift of 19nV/°C (max), and 12ꢀnV
noise in
P-P
Acquisition
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
Medical Instrumentation
The ICs are available in 5-pin SOT2ꢀ, 8-pin SOT2ꢀ,
8-pin µMAX , and 14-pin SO packages and are rated
M
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.
For related parts and recommended products to use with this part,
refer to www.maximintegated.com/MAX44250.related.
Functional Diagrams appear 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.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-6000; Rev 3; 4/13
MAX44250/MAX44251/MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
ABSOLꢀTE MAXIMꢀM RATINGS
Supply Voltage (V
to V ).................................-0.ꢀV to +22V
µMAX (derate 4.5 mW/°C above +70°C) ....................ꢀ62mW
SO (derate 8.ꢀ mW/°C above +70°C)......................666.7mW
Operating Temperature Range........................ -40°C to +125NC
Junction Temperature .....................................................+150NC
Storage Temperature Range............................ -65°C to +150NC
Lead Temperature (soldering, 10s) .............................. +ꢀ00NC
Soldering Temperature (reflow) .................................... +260NC
DD
SS
All Other Pins..................................(V - 0.ꢀV) to (V
+ 0.ꢀV)
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
5-Pin SOT2ꢀ (derate ꢀ.1mW/°C above +70°C)........246.7mW
8-Pin SOT2ꢀ (derate 9.1mW/°C above +70°C)...........727mW
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 SOT2ꢀ
µMAX
Junction-to-Ambient Thermal Resistance (Θ ) .... ꢀ24.ꢀ°C/W
Junction-to-Ambient Thermal Resistance (Θ ) ........221°C/W
JA
JA
Junction-to-Case Thermal Resistance (Θ )...............82°C/W
Junction-to-Case Thermal Resistance (Θ )...............42°C/W
JC
JC
8-Pin SOT2ꢀ
SO
Junction-to-Ambient Thermal Resistance (Θ ) ........120°C/W
Junction-to-Ambient Thermal Resistance (Θ ) ....... 196°C/W
JA
JA
Junction-to-Case Thermal Resistance (Θ )...............70°C/W
Junction-to-Case Thermal Resistance (Θ )...............ꢀ7°C/W
JC
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.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 SꢀPPLY
SYMBOL
CONDITIONS
MIN
TYP
MAX
ꢀNITS
Supply Voltage Range
V
Guaranteed by PSRR
= 2.7V to 20V, V
2.7
20
V
DD
Power-Supply Rejection Ratio
(Note ꢀ)
PSRR
V
= 0V
CM
140
145
dB
DD
T
= +25NC
1.22
1.7
Quiescent Current per Amplifier
(MAX44250)
A
I
R = J
mA
DD
L
-40NC < T < +125NC
1.85
1.55
1.75
A
T
= +25NC
1.15
25
Quiescent Current per Amplifier
(MAX44251/MAX44252)
A
I
R = J
mA
DD
ON
L
-40NC < T < +125NC
A
Power-Up Time
t
Fs
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
1ꢀꢀ
1ꢀ0
140
ꢀ
Common-Mode Rejection Ratio
(Note ꢀ)
1.5V)
CMRR
dB
FV
-40NC < T < +125NC
A
Input Offset Voltage
(MAX44250) (Note ꢀ)
V
T = +25NC
A
9
OS
Maxim Integrated
2
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
ꢀNITS
T
= +25NC
ꢀ
6
7
Input Offset Voltage (MAX44251/
MAX44252)(Note ꢀ)
A
V
FV
OS
-40NC < T < +125NC
A
Input Offset Voltage Drift
(MAX44250) (Note ꢀ)
TC V
TC V
5
5
26
nV/NC
OS
Input Offset Voltage Drift
(MAX44251/MAX44252)(Note ꢀ)
19
nV/NC
OS
Input Bias Current (MAX44250)
(Note ꢀ)
I
I
T
T
= +25NC
= +25NC
200
200
1400
pA
B
B
A
A
1ꢀ00
2400
Input Bias Current (MAX44251/
MAX44252)(Note ꢀ)
pA
pA
-40NC < T < +125NC
A
Input Offset Current (Note ꢀ)
Open-Loop Gain (Note ꢀ)
Output Short-Circuit Current
I
400
154
OS
250mV PV
V
R = 10kIto
V
P
OUT
T
= +25NC
145
1ꢀ6
A
- 250mV,
DD
A
dB
VOL
L
-40NC < T
+125NC
<
A
/2
DD
To V
or V
Noncontinuous
96
12
45
12
45
18
71
18
71
mA
mV
DD
SS
R = 10kIto V /2
26
92
Output Voltage Low
(MAX44250)
L
DD
V
V
V
V
V
- V
OL
OL
OH
OH
OUT
SS
SS
R = 2kIto V /2
L
DD
R = 10kIto V /2
25
Output Voltage Low
(MAX44251/MAX44252)
L
DD
V
- V
mV
mV
mV
OUT
R = 2kIto V /2
85
L
DD
R = 10kIto V /2
40
Output Voltage High
(MAX44250)
L
DD
V
V
- V
DD
DD
OUT
OUT
R = 2kIto V /2
148
ꢀ7
L
DD
R = 10kIto V /2
Output Voltage High
(MAX44251/MAX44252)
L
DD
- V
R = 2kIto V /2
1ꢀ5
L
DD
AC SPECIFICATIONS
Input Voltage-Noise Density
Input Voltage Noise
Input Current-Noise Density
Input Capacitance
e
f = 1kHz
5.9
12ꢀ
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
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 Harmonic Distortion
THD
dB
ns
R = 10kIto
L
f = 20kHz
-119
400
V
/2
DD
Settling Time
To 0.01%, V
= 2V step, A = -1V/V
OUT V
Maxim Integrated
3
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
DD
SS
IN+ IN- DD L DD A
are at T = +25°C.) (Note 2)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
1.17
1.1
MAX
ꢀNITS
POWER SꢀPPLY
T
A
= +25NC
1.65
1.80
1.5
Quiescent Current Per Amplifier
(MAX44250)
I
I
R = J
mA
DD
L
-40NC < T < +125NC
A
T
A
= +25NC
Quiescent Current Per Amplifier
(MAX44251/MAX44252))
R = J
mA
DD
ON
L
-40NC < T < +125NC
1.65
A
Power-Up Time
t
25
Fs
DC SPECIFICATIONS
V
-
V
1.5
-
SS
DD
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
Common-Mode Rejection Ratio
(Note ꢀ)
1.5V)
CMRR
dB
-40NC < T < +125NC
A
Input Offset Voltage
(MAX44250)(Note ꢀ)
V
V
ꢀ
ꢀ
8.5
FV
OS
T
= +25NC
5.5
6.5
Input Offset Voltage (MAX44251/
MAX44252)(Note ꢀ)
A
FV
OS
-40NC < T < +125NC
A
Input Offset Voltage Drift
(MAX44250)(Note ꢀ)
TC V
TC V
8
8
25
18
nV/NC
OS
Input Offset Voltage Drift
(MAX44251/MAX44252)(Note ꢀ)
nV/NC
OS
Input Bias Current
(MAX44250)(Note ꢀ)
I
I
200
200
1450
pA
B
B
T
= +25NC
1100
1200
Input Bias Current (MAX44251/
MAX44252)(Note ꢀ)
A
pA
pA
-40NC < T < +125NC
A
Input Offset Current (Note ꢀ)
Open-Loop Gain (Note ꢀ)
Output Short-Circuit Current
I
400
151
OS
250mV PV
PV
R = 10kIto
V
OUT
T
= +25NC
1ꢀ6
1ꢀꢀ
A
- 250mV,
DD
A
dB
VOL
L
-40NC < T < +125NC
A
/2
DD
To V
or V
Noncontinuous
58
5
mA
mV
DD
SS
R = 10kIto V /2
26
46
22
42
22
52
Output Voltage Low
(MAX44250)
L
DD
V
V
V
V
- V
OL
OL
OH
OUT
SS
SS
R = 2kIto V /2
17
5
L
DD
R = 10kIto V /2
Output Voltage Low
(MAX44251/MAX44252)
L
DD
V
- V
mV
mV
OUT
R = 2kIto V /2
17
9
L
DD
R = 10kIto V /2
L
DD
Output Voltage High
V
- V
DD OUT
R = 2kIto V /2
29
L
DD
Maxim Integrated
4
MAX44250/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 T = +25°C.) (Note 2)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
ꢀNITS
AC SPECIFICATIONS
Input Voltage-Noise Density
Input Voltage Noise
Input Current-Noise Density
Input Capacitance
Gain-Bandwidth Product
Phase Margin
e
f = 1kHz
6.2
12ꢀ
0.ꢀ
2
nV/√Hz
N
0.1Hz < f < 10Hz
f = 1kHz
nV
P-P
i
pA/√Hz
pF
N
C
IN
GBW
PM
10
60
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 Harmonic Distortion
Settling Time
THD
V
= V /4,
dB
ns
CM
DD
R = 10kIto
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. 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 A
DD
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
5
MAX44250/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. 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)
Maxim Integrated
6
MAX44250/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.)
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)
Maxim Integrated
7
MAX44250/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
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
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
FꢀNCTION
MAX44250
MAX44252
5 SOT23
8 µMAX
8 SOT23
8 µMAX
14 SO
1
1
6
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
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
INA+
2
4
4
4
11
5
V
SS
—
—
—
5
—
—
—
7
5
5
INB+
INB-
6
6
6
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
1ꢀ
14
—
INC+
IND+
IND-
OUTD
N.C.
No Connection
Maxim Integrated
9
MAX44250/MAX44251/MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
Electromagnetic interference (EMI) noise occurs at high-
er frequency that results in malfunction or degradation of
Detailed Description
electrical equipment.
The MAX44250/MAX44251/MAX44252 are high-preci-
sion amplifiers that have less than ꢀFV of typical input-
referred offset and low flicker noise. These characteris-
tics are achieved through an autozeroing technique that
samples and finds repeating patterns of signal to cancel
the input offset voltage and 1/f noise of the amplifier.
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.ꢀ5V to 10V split supply.
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.
Applications Information
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.
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.
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
MAX44250/MAX44251/MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
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 1ꢀmV. With a single 10V supply, an acceptable
closed-loop gain of 770V/V provides sufficient gain while
maintaining headroom.
ADC Buffer Amplifier
The MAX44250/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 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.
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-
duces an accurate output voltage, V
equal to I
OUT
LOAD
The MAX11211 ADC operates from a single 2.7V to ꢀ.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.
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 dynamic range at the ADC.
V
SUPPLY
R
1
I
LOAD
OUT
Error Budget Example
When using the ICs as an ADC buffer in strain gauge
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.
MAX44251
MAX44252
R
SENSE
Figure 2. Low-Side Current Sensing
Maxim Integrated
11
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
Ordering Information
PROCESS: BiCMOS
PIN-
PACkAGE
TOP
MARk
PART
TEMP RANGE
MAX44250AUK+
MAX44250AUA+
MAX44251AKA+
MAX44251AUA+
MAX44252ASD+
-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
AFMA
—
AERC
—
—
+Denotes a lead(Pb)-free/RoHS-compliant package.
Maxim Integrated
12
MAX44250/MAX44251/MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
Package Information
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/pacꢁages. 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
5 SOT23
PACkAGE CODE
U5+1
OꢀTLINE NO.
21-0057
LAND PATTERN
90-0174
8 SOT23
K8+5
21-0078
90-0176
8 FMAX
U8+1
21-0036
90-0092
14 SO
S14M+5
21-0041
90-0096
Maxim Integrated
13
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, 6, 11
Added the MAX44250 to the data sheet, added MAX44251 EMIRR graph to Typical
Operating Characteristics, and revised Figure 2.
2
3
8/12
4/13
1–16
1, 10
Updated General Description, Typical Operating Circuit, and Figure 1.
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
14
©
2013 Maxim Integrated
The Maxim logo and Maxim Integrated are trademarks of Maxim Integrated Products, Inc.
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