MAX44241_V01 [MAXIM]
36V, Low-Noise, Precision, Single/Quad/Dual Op Amps;
| 型号： | MAX44241_V01 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 36V, Low-Noise, Precision, Single/Quad/Dual Op Amps |
| 文件： | 总13页 (文件大小：875K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EVALUATION KIT AVAILABLE
MAX44241/MAX44243/MAX44246
36V, Low-Noise, Precision,
Single/Quad/Dual Op Amps
General Description
Benefits and Features
The MAX44241/MAX44243/MAX44246 are 36V, ultra-
precision, low-noise, low-drift, single/quad/dual opera-
tional amplifiers that offer near-zero DC offset and drift
through the use of patented chopper stabilized and
auto-zeroing techniques. This method constantly mea-
sures and compensates the input offset, eliminating drift
over time and temperature and the effect of 1/f noise.
These single/quad/dual devices feature rail-to-rail out-
puts, operate from a single 2.7V to 36V supply or dual
1.3ꢀV to 1ꢁV supplies, and consume only 0.42mA per
channel, with only 9nV/√Hz input-referred voltage noise.
S Reduces Noise-Sensitive Precision Applications
• Low 9nV/√Hz Noise at 1kHz
• Integrated EMI Filter
S Eliminates Cost of Calibration with Increased
Accuracy and Patented Auto-Zero Circuitry
• Ultra-Low Input V : 5µV (max)
OS
• Low 20nV/°C (max) of Offset Drift
S Suitable for High-Bandwidth Applications
• 1µs Fast Settling Time
The ICs are available in ꢁ-pin FMAXM or SO packages
and are rated over the -40NC to +12ꢀNC temperature
range.
• 5MHz Gain-Bandwidth Product
S Low 0.55mA Per Channel (max) Quiescent Current
S Wide Supply for High-Voltage Front-Ends
Applications
Battery-Powered
Equipment
• 2.7V to 36V Supply Range
Transducer Amplifiers
Load Cell Amplifiers
S Rail-to-Rail Output
PLC Analog I/O
Modules
Precision
Instrumentation
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to www.maximintegrated.com/MAX44241.related.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Typical Operating Circuit
15V
3.3V
½ MAX44246
R
1
3V
BUFFER
V
OUT
R
MAX6126
15V
V
DD
-15V
15V
50R
G
R
V
V
REF
DD
V
BUFFER
R
IN+
R
G
MICRO-
PROCESSOR
50R
G
MAX11211
OUTPUT
V
15V
IN-
-15V
R
V
SS
½ MAX44246
C
1
1.5V
½ MAX44246
-15V
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 7; 4/15
MAX44241/MAX44243/MAX44246
36V, Low-Noise, Precision,
Single/Quad/Dual Op Amps
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
All Other Pins................................(GND - 0.3V) to (V
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
to GND) .............................-0.3V to +40V
ꢁ-Pin SO (derate 7.60mW/NC above +70NC)...........606.1mW
14-Pin SO (derate 12.30mW/NC above +70NC).......9ꢁ7.7mW
14-Pin TSSOP (derate 10mW/NC above +70NC).....796.ꢁmW
Operating Temperature Range........................ -40NC to +12ꢀNC
Junction Temperature ....................................................+1ꢀ0NC
Storage Temperature Range............................ -6ꢀNC to +1ꢀ0NC
Lead Temperature (soldering,10s) .................................+300NC
Soldering Temperature (reflow) ......................................+260NC
DD
+ 0.3V)
DD
Continuous Power Dissipation (T = +70NC)
A
ꢀ-Pin SOT23 (derate 3.9mW/NC above +70NC).......312.6mW
ꢁ-Pin FMAX (derate 4.ꢁmW/NC above +70NC)........3ꢁ7.ꢁmW
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
SOT23
Junction-to-Ambient Thermal Resistance (q ) .....206.3NC/W
Junction-to-Ambient Thermal Resistance (q ) .....2ꢀꢀ.9NC/W
JA
JA
Junction-to-Case Thermal Resistance (q ) ..............42NC/W
Junction-to-Case Thermal Resistance (q ) ..............ꢁ1NC/W
JC
JC
SO-ꢁ
TSSOP
Junction-to-Ambient Thermal Resistance (q ) .....100.4NC/W
Junction-to-Ambient Thermal Resistance (q ) ........132NC/W
JA
JA
Junction-to-Case Thermal Resistance (q ) ..............3ꢁNC/W
Junction-to-Case Thermal Resistance (q ) ..............30NC/W
JC
JC
SO-14
Junction-to-Ambient Thermal Resistance (q ) ..........ꢁ1NC/W
JA
Junction-to-Case Thermal Resistance (q ) ..............32NC/W
JC
Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESDꢀ1-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
ELECTRICAL CHARACTERISTICS
(V
= 30V, V
= 0V, V
= V = V /2, R = ꢀkΩ to V /2, T = -40°C to +12ꢀ°C, unless otherwise noted. Typical values at
DD
GND
IN+ IN- DD L DD A
T
= +2ꢀ°C.) (Note 3)
A
PARAMETER
SYMBOL
CONDITIONS
Guaranteed by PSRR
MIN
2.7
TYP
166
0.42
20
MAX
UNITS
V
Supply Voltage Range
DD
36
V
V
V
= 2.7V to 36V, T =
+2ꢀNC
= 2.7V to 36V, -40NC < T < +12ꢀNC
14ꢁ
146
Power-Supply Rejection Ratio
(Note 4)
DD
A
PSRR
dB
DD
A
T
=
+2ꢀNC
0.ꢀꢀ
0.60
A
I
Quiescent Current per Amplifier
DD
R = J
mA
L
-40NC < T
< +12ꢀNC
A
t
Power-Up Time
ON
Fs
DC SPECIFICATIONS
(V
- 0.0ꢀ)
(V
DD
- 1.ꢀ)
GND
V
Input Common-Mode Range
CM
Guaranteed by CMRR test
= (V - 0.0ꢀV) to (V
V
Common-Mode Rejection Ratio
(Note 4)
CMRR
V
- 1.ꢀV)
146
166
1
dB
CM
GND
DD
V
Input Offset Voltage (Note 4)
OS
ꢀ
FV
Maxim Integrated
2
MAX44241/MAX44243/MAX44246
36V, Low-Noise, Precision,
Single/Quad/Dual Op Amps
ELECTRICAL CHARACTERISTICS (continued)
(V
= 30V, V
= 0V, V
= V = V /2, R = ꢀkΩ to V /2, T = -40°C to +12ꢀ°C, unless otherwise noted. Typical values at
DD
GND
IN+
IN-
DD
L
DD
A
T
= +2ꢀ°C.) (Note 3)
A
PARAMETER
SYMBOL
TC V
CONDITIONS
MIN
TYP
1
MAX
UNITS
Input Offset Voltage Drift
(Note 4)
20
nV/NC
OS
T
=
+2ꢀNC
300
600
A
Input Bias Current (Note 4)
I
pA
B
-40NC < T
< +12ꢀNC
12ꢀ0
1200
2ꢀ00
A
T
=
+2ꢀNC
600
A
I
Input Offset Current (Note 4)
Open-Loop Gain (Note 4)
Output Short-Circuit Current
OS
pA
dB
mA
-40NC < T
<
+12ꢀN
C
A
A
P (V
DD
– 0.ꢀV)
VOL
(V
+ 0.ꢀV) P V
1ꢀ4
16ꢁ
40
GND
OUT
Sinking
Noncontinuous
Sourcing
30
T
=
+2ꢀNC
90
11ꢀ
1ꢁ0
A
V
Output Voltage Low
Output Voltage High
OL
mV
V
-40NC < T
<
+12ꢀNC
A
(V
0.17)
(V
DD
0.13)
-
-
DD
T
= +2ꢀNC
A
V
OH
(V
0.2ꢀ)
-
DD
-40NC < T
<
+12ꢀNC
A
AC SPECIFICATIONS
Input Voltage-Noise Density
Input Voltage Noise
Input Capacitance
Gain-Bandwidth Product
Phase Margin
e
f = 1kHz
9
nV/
√
Hz
N
nV
0.1Hz < f < 10Hz
117
2
P-P
C
IN
pF
GBW
PM
ꢀ
MHz
Degrees
V/Fs
C
= 20pF
60
L
Slew Rate
SR
A
= 1V/V, V
= 4V
3.ꢁ
300
-96
-77
-91
-76
V
OUT
P-P
Capacitive Loading
C
No sustained oscillation, A = 1V/V
pF
L
V
,
f = 1kHz
f = 20kHz
f = 1kHz
f = 20kHz
V
= 4V
P-P
OUT
dB
dB
A
= +1V/V
V
Total Harmonic Distortion
THD
,
V
= 2V
P-P
OUT
A
= +1V/V
V
ELECTRICAL CHARACTERISTICS
(V
= 10V, V
= 0V, V
= V = V /2, R = ꢀkΩ to V /2, T = -40°C to +12ꢀ°C, unless otherwise noted. Typical values at
DD
GND
IN+
IN-
DD
L
DD
A
T
= +2ꢀ°C.) (Note 3)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
0.42
20
MAX
UNITS
POWER SUPPLY
T
=
+2ꢀNC
0.ꢀꢀ
0.60
A
I
Quiescent Current per Amplifier
Power-Up Time
DD
R
= J
mA
L
-40NC < T
<
+12ꢀNC
A
t
ON
Fs
Maxim Integrated
3
MAX44241/MAX44243/MAX44246
36V, Low-Noise, Precision,
Single/Quad/Dual Op Amps
ELECTRICAL CHARACTERISTICS (continued)
(V
= 10V, V
= 0V, V
= V = V /2, R = ꢀkΩ to V /2, T = -40°C to +12ꢀ°C, unless otherwise noted. Typical values at
DD
GND
IN+ IN- DD L DD A
T
= +2ꢀ°C.) (Note 3)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC SPECIFICATIONS
(V
1.ꢀ)
–
(V
- 0.0ꢀ)
GND
DD
V
Input Common-Mode Range
CM
Guaranteed by CMRR test
= (V - 0.0ꢀV) to (V - 1.ꢀV)
DD
V
Common-Mode Rejection Ratio
(Note 4)
CMRR
V
140
1ꢀꢁ
dB
CM
GND
V
Input Offset Voltage (Note 4)
OS
1
ꢀ
FV
Input Offset Voltage Drift (Note 4)
TC V
2.4
300
20
nV/NC
OS
T
=
+2ꢀNC
600
1100
1200
2200
A
Input Bias Current (Note 4)
I
pA
B
-40NC < T
<
+12ꢀN
C
A
T
=
+2ꢀNC
600
A
I
Input Offset Current (Note 4)
Open-Loop Gain (Note 4)
Output Short-Circuit Current
OS
pA
dB
mA
-40NC < T
<
+12ꢀNC
A
A
VOL
(V
+ 0.ꢀV) ≤ V
≤ (V - 0.ꢀV)
DD
144
164
40
GND
OUT
Sinking
Sourcing
Noncontinuous
30
T
=
+2ꢀNC
30
40
60
A
V
Output Voltage Low
Output Voltage High
OL
mV
V
-40NC < T
<
+12ꢀN
C
A
(V
(V
DD
0.0ꢀ)
-
-
DD
T
= +2ꢀNC
A
0.06)
V
OH
(V
-
DD
-40NC < T
< +12ꢀN
C
A
0.09)
AC SPECIFICATIONS
Input Voltage-Noise Density
Input Voltage Noise
Input Capacitance
Gain-Bandwidth Product
Phase Margin
e
f = 1kHz
9
117
2
nV/
√
Hz
N
nV
0.1Hz < f < 10Hz
P-P
C
pF
IN
GBW
PM
ꢀ
MHz
Degrees
V/µs
C
= 20pF
60
3.ꢁ
300
-92
-76
1
L
Slew Rate
SR
A
= +1V/V, V
= 2V , 10% to 90%
V
OUT P-P
Capacitive Loading
C
No sustained oscillation, A = 1V/V
pF
L
V
f = 1kHz
V
= 2V
,
OUT
P-P
Total Harmonic Distortion
Settling Time
THD
dB
µs
A
= 1V/V
f = 20kHz
V
To 0.01%, V
= 2V step, A = 1V/V
V
OUT
Note 3: All devices are 100% production tested at T = +2ꢀ°C. Temperature limits are guaranteed by design.
A
Note 4: Guaranteed by design.
Maxim Integrated
4
MAX44241/MAX44243/MAX44246
36V, Low-Noise, Precision,
Single/Quad/Dual Op Amps
Typical Operating Characteristics
(V
= 10V, V
= 0V, V
= V = V /2, R = ꢀkΩ to V /2, T = -40°C to +12ꢀ°C, unless otherwise noted. Typical values are
DD
A
GND
IN+ IN- DD L DD A
at T = +2ꢀ°C.) (Note 3)
INPUT OFFSET VOLTAGE DRIFT
HISTOGRAM
SUPPLY CURRENT PER AMPLIFIER
vs. SUPPLY VOLTAGE
INPUT OFFSET VOLTAGE HISTOGRAM
35
30
25
20
15
10
5
45
40
35
30
25
20
15
10
5
500
450
400
350
300
250
200
150
100
50
V
= V /2
DD
IN
NO LOAD
0
0
0
5
10 15 20 25 30 35 40
SUPPLY VOLTAGE (V)
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
-0.006 -0.004 -0.002
0
0.002 0.003 0.005
OFFSET VOLTAGE (µV)
OFFSET VOLTAGE DRIFT (µV/°C)
SUPPLY CURRENT PER AMPLIFIER
vs. TEMPERATURE
INPUT OFFSET VOLTAGE vs. INPUT
COMMON-MODE VOLTAGE
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
470
460
450
440
430
420
410
400
390
3
2
5
0
V
= V /2
DD
IN
NO LOAD
1
0
-1
-2
-3
-5
-50 -25
0
25
50
75 100 125
0
1
2
3
4
5
6
7
8
9
-50 -25
0
25
50
75 100 125
TEMPERATURE (°C)
V
(V)
TEMPERATURE (°C)
CM
INPUT BIAS CURRENT vs. V
vs. TEMPERATURE
COMMON-MODE REJECTION RATIO
vs. TEMPERATURE
INPUT BIAS CURRENT
vs. TEMPERATURE
CM
toc08
700
600
500
400
300
200
100
0
2000
1800
1600
1400
1200
1000
800
600
400
200
0
-200
-400
-600
-800
-1000
180
170
160
150
140
130
120
110
100
90
IB+ (
T = +125°C)
A
IB+
IB- (
T = +25°C)
A
IB- (
T = +125°C)
A
IB+ (
T = +25°C)
A
IB-
-100
-200
-300
IB- (
T = -40°C)
A
IB+ (
T
=
5
-40°C)
6
A
80
-1
0
1
2
3
4
7
8
9
-50 -25
0
25
50
75 100 125
-50
0
50
100
150
TEMPERATURE (°C)
V
(V)
TEMPERATURE (°C)
CM
Maxim Integrated
5
MAX44241/MAX44243/MAX44246
36V, Low-Noise, Precision,
Single/Quad/Dual Op Amps
Typical Operating Characteristics (continued)
(V
= 10V, V
= 0V, V
= V = V /2, R = ꢀkΩ to V /2, T = -40°C to +12ꢀ°C, unless otherwise noted. Typical values are
DD
A
GND
IN+ IN- DD L DD A
at T = +2ꢀ°C.) (Note 3)
POWER-SUPPLY REJECTION RATIO
vs. TEMPERATURE
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
OPEN-LOOP GAIN vs. FREQUENCY
160
140
120
100
80
180
200
150
100
50
V
= 100mV
P-P
IN
100mV
P-P
170
160
150
140
130
120
110
100
90
60
40
20
0
0
-20
-40
-50
80
0.1
1
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
-50 -25
0
25
50
75 100 125
0.01 0.1
1
10 100 1k 10k 100k 1M 10M100M
FREQUENCY (Hz)
TEMPERATURE (°C)
OUTPUT VOLTAGE HIGH
vs. OUTPUT SOURCE CURRENT
OUTPUT VOLTAGE LOW
vs. TEMPERATURE
OUTPUT VOLTAGE LOW
vs. OUTPUT SINK CURRENT
500
450
400
350
300
250
200
150
100
50
450
400
350
300
250
200
150
100
50
70
60
50
40
30
20
10
0
0
0
0
2
4
6
8
10
0
2
4
6
8
10
-50 -25
0
25
50
75 100 125
OUTPUT SINK CURRENT (mA)
OUTPUT SOURCE CURRENT (mA)
TEMPERATURE (°C)
OUTPUT VOLTAGE HIGH
vs. TEMPERATURE
LARGE-SIGNAL GAIN vs. FREQUENCY
SMALL-SIGNAL GAIN vs. FREQUENCY
9.970
9.965
9.960
9.955
9.950
9.945
9.940
9.935
9.930
2
0
5
0
-2
-5
NORMALIZED GAIN,
NORMALIZED GAIN,
V = 2V
IN P-P
V
= 100mV
IN
P-P
-4
-10
-15
-20
-25
-30
-35
-40
-45
-50
-6
-8
-10
-12
-14
-16
-18
-20
-50 -25
0
25
50
75 100 125
10 100 1k
10k 100k 1M 10M 100M
FREQUENCY (Hz)
10 100 1k
10k 100k 1M 10M 100M
FREQUENCY (Hz)
TEMPERATURE (°C)
Maxim Integrated
6
MAX44241/MAX44243/MAX44246
36V, Low-Noise, Precision,
Single/Quad/Dual Op Amps
Typical Operating Characteristics (continued)
(V
= 10V, V
= 0V, V
= V = V /2, R = ꢀkΩ to V /2, T = -40°C to +12ꢀ°C, unless otherwise noted. Typical values are
DD
A
GND
IN+ IN- DD L DD A
at T = +2ꢀ°C.) (Note 3)
INPUT VOLTAGE NOISE vs. FREQUENCY
INPUT VOLTAGE 0.1Hz TO 10Hz NOISE
MAX44241 toc20
85
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
200nV/div
0
1
10
100
1k
10k
100k
1s/div
FREQUENCY (Hz)
LARGE-SIGNAL (2V
STEP RESPONSE vs. TIME
SMALL-SIGNAL (100mV
STEP RESPONSE vs. TIME
P-P)
P-P)
MAX44241 toc22
MAX44241 toc21
V
V
IN
1V/div
IN
50mV/div
V
V
OUT
OUT
1V/div
50mV/div
1µs/div
1µs/div
STABILITY vs. CAPACITIVE AND
RESISTIVE LOAD IN PARALLEL
STABILITY vs. CAPACITIVE LOAD AND
SERIES ISOLATION RESISTANCE
POWER-UP TIME
MAX44241 toc25
100
10
100
10
1
STABLE
V
= V = 0V
DD
SS
V
= 10V
DD
5V/div
1
UNSTABLE
UNSTABLE
0.1
STABLE
V
= V
OUT
= 0V
IN
0.01
0.001
200mV/div
0.1
100
1k
10k
100k
100
1k
10k
100k
CAPACITIVE LOAD (pF)
CAPACITIVE LOAD (pF)
20µs
Maxim Integrated
7
MAX44241/MAX44243/MAX44246
36V, Low-Noise, Precision,
Single/Quad/Dual Op Amps
Typical Operating Characteristics (continued)
(V
= 10V, V
= 0V, V
= V = V /2, R = ꢀkΩ to V /2, T = -40°C to +12ꢀ°C, unless otherwise noted. Typical values are
DD
A
GND
IN+ IN- DD L DD A
at T = +2ꢀ°C.) (Note 3)
TOTAL HARMONIC DISTORTION
vs. OUTPUT AMPLITUDE
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
CROSSTALK vs. FREQUENCY
0
-20
0
-10
0
-20
-20
-40
-40
-30
-40
-60
-50
-80
-60
-60
-70
-100
-120
-140
-160
-80
-80
2V OUTPUT
P-P
-90
-100
-110
-120
-100
-120
4V OUTPUT
P-P
1
10 100 1k
10k 100k 1M 10M
10
100
1k
10k
100k
0
1
2
3
4
5
6
7
8
9
10
FREQUENCY (Hz)
FREQUENCY (Hz)
OUTPUT AMPLITUDE (V)
EMIRR
vs. FREQUENCY (V = 3.3V)
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
DD
100
90
80
70
60
50
40
30
20
10
0
0
-10
V
= 30V
DD
-20
-30
-40
-50
-60
-70
-80
2V INPUT
P-P
-90
-100
-110
-120
4V INPUT
P-P
1
10
100
1000
10,000
10
100
1k
10k
100k
FREQUENCY (MHz)
FREQUENCY (Hz)
Maxim Integrated
8
MAX44241/MAX44243/MAX44246
36V, Low-Noise, Precision,
Single/Quad/Dual Op Amps
Pin Configurations
TOP VIEW
+
OUTA
1
2
3
5
4
V
DD
+
8
7
6
5
N.C.
INA-
INA+
1
2
3
4
N.C.
MAX44241
V
DD
MAX44241
V
SS
OUTA
N.C.
V
SS
INA+
INA-
µMAX
SOT-23
+
OUTA
INA-
1
2
3
4
5
6
7
14 OUTD
13 IND-
12 IND+
+
OUTA
INA-
1
14 OUTD
2
3
4
5
6
7
13 IND-
12 IND+
MAX44243
INA+
INA+
MAX44243
V
11 V
SS
DD
V
11
V
SS
DD
INB+
INB-
10 INC+
INB+
INB-
10 INC+
9
8
INC-
9
8
INC-
OUTB
OUTC
OUTB
OUTC
TSSOP
SO
+
OUTA
1
2
3
4
8
7
6
5
V
DD
MAX44246
INA-
INA+
GND
OUTB
INB-
INB+
µMAX/SO
Maxim Integrated
9
MAX44241/MAX44243/MAX44246
36V, Low-Noise, Precision,
Single/Quad/Dual Op Amps
Pin Descriptions
PIN
MAX44241
MAX44243
MAX44246
NAME
FUNCTION
SOT23-5
µMAX-8
SO-14
TSSOP-14
SO-8
µMAX-8
1
2
6
1
11
3
1
11
3
1
4
1
4
OUTA
Channel A Output
4
V
Negative Supply Voltage
Channel A Positive Input
Channel A Negative Input
Positive Supply Voltage
Channel B Positive Input
Channel B Negative Input
Channel B Output
SS
3
3
3
3
INA+
INA-
4
2
2
2
2
2
5
7
4
4
8
8
V
DD
—
—
—
—
—
—
—
—
—
5
5
5
5
INB+
INB-
—
—
—
—
—
—
—
—
—
6
6
6
6
7
7
7
7
OUTB
OUTC
INC-
8
8
Channel C Output
—
—
—
—
—
—
—
—
—
—
—
—
9
9
Channel C Negative Input
Channel C Positive Input
Channel D Positive Input
Channel D Negative Input
Channel D Output
10
12
13
14
10
12
13
14
INC+
IND+
IND-
OUTD
No Connection. Not internally
connected.
1, 5, 8
—
—
N.C.
—
—
—
Maxim Integrated
10
MAX44241/MAX44243/MAX44246
36V, Low-Noise, Precision,
Single/Quad/Dual Op Amps
Detailed Description
V
SUPPLY
The MAX44241/MAX44243/MAX44246 are high-precision
amplifiers that provide below ꢀµV of maximum input-
referred offset and low flicker noise. These characteris-
tics 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 ampli-
fiers, 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.
I
LOAD
½ MAX44246
OUT
R
SENSE
R2
R1
Figure 1. Low-Side Current Sensing
Noise Suppression
Flicker noise, inherent in all active devices, is inverse-
ly 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
MAX44241/MAX44243/MAX44246 eliminate the 1/f noise
internally, thus making them ideal choices for DC or sub-
Hz precision applications. The 1/f noise appears as a
slow varying offset voltage and is eliminated by the chop-
ping technique used.
Circuit details an example of a load cell and ampli-
fier driven from the same 10V supplies, along with the
MAX11211 1ꢁ-bit delta sigma ADC. Load cells produce a
very small voltage change at their outputs; therefore driv-
ing the excitation source with a higher voltage produces
a wider dynamic range that can be measured at the ADC
inputs.
The MAX11211 ADC operates from a single 2.7V to 3.6V
analog supply, offers 1ꢁ-bit noise-free resolution and
0.ꢁ6mW power dissipation. The MAX11211 also offers
> 100dB rejection at ꢀ0Hz and 60Hz. This ADC is part of
a family of 16-, 1ꢁ-, 20-, and 24-bit delta sigma ADCs with
high precision and < 1mW power dissipation.
Electromagnetic interference (EMI) noise occurs at higher
frequency, resulting in malfunction or degradation of elec-
trical 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 sig-
nificant higher impedance to higher frequency.
The low input offset voltage and low noise of MAX44241/
MAX44243/MAX44246 allow a gain circuit to precede the
MAX11211 without losing any dynamic range at the ADC.
See the Typical Operating Circuit.
Applications Information
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.
ADC Buffer Amplifier
The MAX44241/MAX44243/MAX44246 have low input
offset voltage, low noise, and fast settling time that make
these amplifiers 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
This circuit produces an accurate output voltage, V
OUT
equal to I
x R
x (1 + R /R ).
LOAD
SENSE 2 1
Maxim Integrated
11
MAX44241/MAX44243/MAX44246
36V, Low-Noise, Precision,
Single/Quad/Dual Op Amps
Layout Guidelines
Ordering Information
The MAX44241/MAX44243/MAX44246 feature ultra-low
offset voltage and noise. Therefore, to get optimum per-
formance follow the following layout guidelines.
TOP
MARK
PIN-
PACKAGE
PART
TEMP RANGE
MAX44241AUA+ -40NC to +12ꢀNC ꢁ FMAX
MAX44241AUK+ -40NC to +12ꢀNC ꢀ SOT23
MAX44243ASD+ -40NC to +12ꢀNC 14 SO
MAX44243AUD+ -40NC to +12ꢀNC 14 TSSOP
MAX44246ASA+ -40NC to +12ꢀNC ꢁ SO
MAX44246AUA+ -40NC to +12ꢀNC ꢁ FMAX
+Denotes a lead(Pb)-free/RoHS-compliant package.
—
AFMQ
—
Avoid temperature gradients at the junction of two dis-
similar metals. The most common dissimilar metals used
on a PCB are solder-to-component lead and solder-to-
board trace. Dissimilar metals create a local thermo-
couple. 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
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.
—
—
—
Chip Information
PROCESS: BiCMOS
Package Information
For the latest package outline information and land patterns (foot-
prints), 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.
ꢀ SOT23
ꢁ SO
Uꢀ+1
Sꢁ+4
21-0057
21-0041
21-0036
21-0041
21-0066
90-0174
90-0096
90-0092
90-0112
90-0113
ꢁ µMAX
14 SO
Uꢁ+1
S14M+4
U14M+1
14 TSSOP
Maxim Integrated
12
MAX44241/MAX44243/MAX44246
36V, Low-Noise, Precision,
Single/Quad/Dual Op Amps
Revision History
REVISION REVISION
PAGES
DESCRIPTION
CHANGED
NUMBER
DATE
7/12
9/12
2/13
ꢀ/13
0
1
2
3
Initial release
Revised the Electrical Characteristics and the Typical Operating Characteristics.
—
1, 2, 3, ꢀ
Revised the Typical Operating Characteristics.
ꢁ
Updated General Description, Typical Application Circuit, and Pin Description.
1, 9
Added the MAX44241/MAX44243 to the data sheet. Revised the Typical Operating
Circuit.
4
9/13
1–13
ꢀ
6
7
1/14
12/14
4/1ꢀ
Revised Electrical Characteristics and the Typical Operating Characteristics.
Revised Benefits and Features section.
2, ꢀ
1
Revised Ordering Information
13
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
13
©
201ꢀ Maxim Integrated
The Maxim logo and Maxim Integrated are trademarks of Maxim Integrated Products, Inc.
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