MAX44242_V01 [MAXIM]
20V, Low Input Bias-Current, Low-Noise, Dual Op Amplifier;
| 型号： | MAX44242_V01 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 20V, Low Input Bias-Current, Low-Noise, Dual Op Amplifier |
| 文件： | 总11页 (文件大小：994K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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20V, Low Input Bias-Current,
Low-Noise, Dual Op Amplifier
MAX44242
General Description
The MAX44242 provides a combination of high voltage,
low noise, low input bias current in a dual channel and
features rail-to-rail at the output.
Benefits and Features
● 2.7V to 20V Single Supply or ±1.35V to ±10V Dual
Supplies
● 0.5pA (max) Input Bias Current
This dual amplifier operates over a wide supply voltage
range from a single 2.7V to 20V supply or split ±1.35V
to ±10V supplies and consumes only 1.2mA quiescent
supply current per channel.
●
5nV/√Hz Input Voltage Noise
● 10MHz Bandwidth
● 8V/µs Slew Rate
● Rail-to-Rail Output
The MAX44242 is a unity-gain stable amplifier with a
gain-bandwidth product of 10MHz. The device outputs
drive up to 200pF load capacitor without any external
isolation resistor compensation.
● Integrated EMI Filters
● 1.2mA Supply Current per Amplifier
®
The MAX44242 is available in 8-pin SOT23 and µMAX
Ordering Information appears at end of data sheet.
packages and is rated for operation over the -40ºC to
+125ºC automotive temperature range.
Applications
● Chemical Sensor Interface
● Photodiode Sensor Interface
● Medical Pulse Oximetry
● Industrial: Process and Control
● Precision Instrumentation
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Typical Application Circuit
VDD
PHOTODIODE
IN-
PHOTODIODE
OUT
IN-
IN+
OUT
REF
IN+
MAX44242
REF
19-6827; Rev 3; 3/21
©
2021 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners.
One Analog Way, Wilmington, MA 01887 U.S.A. Tel: 781.329.4700 © 2021 Analog Devices, Inc. All rights reserved.
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MAX44242
20V, Low Input Bias-Current,
Low-Noise, Dual Op Amplifier
Absolute Maximum Ratings
Supply Voltage (V
to V )................................-0.3V to +22V
Operating Temperature Range......................... -40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range............................ -65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
DD
SS
All Other Pins ................................(V - 0.3V) to (V
+ 0.3V)
SS
DD
Short-Circuit Duration to V
or V ...................................... 1s
DD
SS
Continuous Input Current (Any Pins) ...............................±20mA
Differential Input Voltage ...................................................... ±6V
Continuous Power Dissipation (T = +70°C)
A
8-Pin SOT23 (derate 5.1mW/°C above +70°C) .......408.2mW
8-Pin µMAX (derate 4.5mW/°C above +70°C)............362mW
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.
(Note 1)
Package Thermal Characteristics
SOT23
μMAX
ꢀ
ꢀ
Junction-to-AmbientꢀThermalꢀResistanceꢀ(θ ) ........196°C/W
ꢀ
ꢀ
Junction-to-AmbientꢀThermalꢀResistanceꢀ(θ ) ........221°C/W
Junction-to-CaseꢀThermalꢀResistanceꢀ(θ )...............42°C/W
JC
JA
JA
Junction-to-CaseꢀThermalꢀResistanceꢀ(θ )...............70°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.maximintegrated.com/thermal-tutorial.
Electrical Characteristics
(V
= 10V, V = 0V, V
= V = V /2, R ꢀ=ꢀ10kΩꢀtoꢀV /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
2.7
106
100
20
V
DD
T = +25ºC
A
130
1.2
20
V
V
= 2.7V to 20V,
= 0V
DD
CM
Power-Supply Rejection Ratio
PSRR
dB
-40ºCꢀ≤ꢀT ꢀ≤ꢀꢀ+125ºC
A
T
= +25ºC
1.6
1.8
A
QuiescentꢀCurrentꢀPerꢀAmplifier
I
R
ꢀ=ꢀinfinity
LOAD
mA
µs
DD
-40ºCꢀ≤ꢀꢀT ꢀ≤ꢀ+125ºC
A
Power-Up Time
t
ON
DC CHARACTERISTICS
Input Common-Mode Range
V
Guaranteed by CMRR test
= +25ºC
V
- 0.05
V - 1.5
DD
V
CM
SS
94
90
T
A
111
50
V
CM
to V
= V - 0.05V
SS
Common-Mode Rejection Ratio
CMRR
dB
- 1.5V
DD
-40ºCꢀ≤ꢀT ꢀ≤ꢀ+125ºC
A
T
= +25ºC
600
A
InputꢀOffsetꢀVoltageꢀ
V
µV
OS
-40ºCꢀ≤ꢀT ꢀ≤ꢀ+125ºC
800
2.5
0.5
10
A
InputꢀOffsetꢀVoltageꢀDriftꢀ(Noteꢀ3)
TC V
OS
0.25
0.02
µV/ºC
T
= +25ºC
A
Input Bias Current (Note 3)
I
-40ºCꢀ≤ꢀT ꢀ≤ꢀ+85ºC
pA
B
A
-40ºCꢀ≤ꢀT ꢀ≤ꢀ+125ºC
50
A
Analog Devices
│ 2
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MAX44242
20V, Low Input Bias-Current,
Low-Noise, Dual Op Amplifier
Electrical Characteristics (continued)
(V
= 10V, V = 0V, V
= V = V /2, R ꢀ=ꢀ10kΩꢀtoꢀV /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
0.5
10
UNITS
T
= +25°C
0.04
A
InputꢀOffsetꢀCurrentꢀ(Noteꢀ3)
I
-40°Cꢀ≤ꢀT ꢀ≤ꢀ+85°C
pA
OS
A
-40°Cꢀ≤ꢀT ꢀ≤ꢀ+125°C
25
A
T = +25°C
A
134
129
145
250mVꢀ≤ꢀV
ꢀ≤ꢀ
OUT
Open Loop Gain
A
dB
VOL
V
- 250mV
DD
Differential
Common mode
To V or V
-40°Cꢀ≤ꢀT ꢀ≤ꢀ+125°C
A
50
200
95
Input Resistance
R
GΩ
mA
mV
IN
Output Short-Circuit Current
Output Voltage Low
Noncontinuous
DD SS
R
R
R
R
ꢀ=ꢀ10kΩꢀtoꢀV /2
DD
25
85
LOAD
LOAD
LOAD
LOAD
V
V
- V
OUT SS
OL
ꢀ=ꢀ2kΩꢀtoꢀV /2
DD
ꢀ=ꢀ10kΩꢀtoꢀV /2
DD
37
Output Voltage High
V
V
- V
mV
OH
DD
OUT
ꢀ=ꢀ2kΩꢀtoꢀV /2
135
DD
AC CHARACTERISTICS
Input Voltage-Noise Density
Input Voltage Noise
Input Current-Noise Density
Input Capacitance
e
f = 1kHz
5
1.6
0.3
4
nV/√Hz
n
0.1Hzꢀ≤ꢀfꢀ≤ꢀ10Hz
µV
P-P
I
f = 1kHz
pA/√Hz
pF
N
C
IN
Gain-Bandwidth Product
Phase Margin
GBW
PM
10
60
8
MHz
deg
C
= 20pF
LOAD
Slew Rate
SR
A
= 1V/V, V = 2V
OUT P-P
, 10% to 90%
V/µs
pF
V
Capacitive Loading
C
No sustained oscillation, A = 1V/V
200
-124
-100
35
40
50
57
1
LOAD
V
f = 1kHz
Total Harmonic Distortion Plus
Noise
V
A
= 2V ,
P-P
= +1V/V
OUT
THD+N
dB
V
f = 20kHz
f = 400MHz
f = 900MHz
f = 1800MHz
f = 2400MHz
EMI Rejection Ratio
Settling Time
EMIRR
V
= 100mV
dB
µs
RF_PEAK
To 0.01%, V
= 2V step, A = -1V/V
V
OUT
Note 2: All devices are production tested at T = +25°C. Specifications over temperature are guaranteed by design.
A
Note 3: Guaranteed by design.
Analog Devices
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MAX44242
20V, Low Input Bias-Current,
Low-Noise, Dual Op Amplifier
Typical Operating Characteristics
(V
= 10V, V = 0V, outputs have R ꢀ=ꢀ10kΩꢀtoꢀV /2. T ꢀ=ꢀ+25°C,ꢀunlessꢀotherwiseꢀspecified.)
SS L DD A
DD
SUPPLY CURRENT PER AMPLIFIER
INPUT OFFSET VOLTAGE DRIFT HISTOGRAM
INPUT OFFSET VOLTAGE HISTOGRAM
vs. TEMPERATURE
toc01
toc02
toc03
16
14
12
10
8
25
20
15
10
5
HISTOGRAM
HISTOGRAM
VIN = VDD/2
NO LOAD
1300
1200
1100
1000
900
VDD = 20V
VDD = 15V
VDD = 10V
VDD = 5.5V
6
4
VDD = 2.7V
2
0
0
-250 -200 -150 -100 -50
0
50 100 150 200 250
-600 -400 -200
0
200
400
600
-50 -25
0
25
50
75 100 125 150
INPUT OFFSET VOLTAGE DRIFT (nV/°C)
INPUT OFFSET VOLTAGE (μV)
TEMPERATURE (°C)
INPUT BIAS CURRENT
vs. INPUT COMMON-MODE VOLTAGE
vs. TEMPERATURE
INPUT OFFSET VOLTAGE
vs. INPUT COMMON-MODE VOLTAGE
vs. TEMPERATURE
COMMON-MODE REJECTION RATIO
vs. TEMPERATURE
toc04
toc05
toc06
20
300
250
200
150
100
50
140
120
100
80
VIN = VDD/2
10kΩ
TA = +125°C
0
-20
TA = +125°C
TA = +85°C
TA = +25°C
-40
-60
60
TA = +105°C
-80
40
-100
-120
-140
0
TA = -40°C
20
-50
-100
TA = +85°C
TA = +25°C
0
-1
1
3
5
7
9
0
2
4
6
8
10
-50
-25
0
25
50
75
100 125
INPUT COMMON-MODE VOLTAGE (V)
INPUT COMMON-MODE VOLTAGE (V)
TEMPERATURE (°C)
POWER-SUPPLY REJECTION RATIO
vs. TEMPERATURE
AC CMRR
vs. FREQUENCY
toc08
toc07
150
130
110
90
140
120
100
80
60
70
40
50
20
0
30
1
100
10000
1000000
-50
-25
0
25
50
75
100 125
TEMPERATURE (°C)
FREQUENCY (Hz)
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MAX44242
20V, Low Input Bias-Current,
Low-Noise, Dual Op Amplifier
Typical Operating Characteristics (continued)
(V
= 10V, V = 0V, outputs have R ꢀ=ꢀ10kΩꢀtoꢀV /2. T ꢀ=ꢀ+25°C,ꢀunlessꢀotherwiseꢀspecified.)
SS L DD A
DD
AC PSRR
vs. FREQUENCY
SMALL-SIGNAL RESPONSE
vs. FREQUENCY
AVOL
vs. FREQUENCY
toc09
toc10
toc11
120
100
80
10
5
130
110
90
0
70
-5
50
60
30
-10
-15
-20
10
40
-10
-30
100mVP-P
INPUT
20
10
1,000
100,000
10,000,000
10
1,000
100,000
10,000,000
10
1,000
100,000
10,000,000
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
LARGE-SIGNAL RESPONSE
vs. FREQUENCY
INPUT VOLTAGE-NOISE DENSITY
vs. FREQUENCY
0.1 Hz to 10 Hz PEAK TO PEAK NOISE
toc12
toc14
toc13
5
40
35
30
25
20
15
10
5
0
-5
-10
-15
-20
-25
-30
1μV/div
2VP-P Input
100,000 10,000,000
en = 1.6μVP-P
0
10
1,000
FREQUENCY (Hz)
10
100
1000
10000
100000
FREQUENCY (Hz)
OUTPUT VOLTAGE HIGH (VDD - VOUT
vs. OUTPUT SOURCE CURRENT
)
INPUT CURRENT-NOISE DENSITY
vs. FREQUENCY
toc15
toc16
5
4
3
2
1
0
650
600
550
500
450
400
350
300
250
200
150
100
50
0
10
100
1000
10000
0
4
8
12
16
20
FREQUENCY (Hz)
OUTPUT SOURCE CURRENT (mA)
Analog Devices
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MAX44242
20V, Low Input Bias-Current,
Low-Noise, Dual Op Amplifier
Typical Operating Characteristics (continued)
(V
= 10V, V = 0V, outputs have R ꢀ=ꢀ10kΩꢀtoꢀV /2. T ꢀ=ꢀ+25°C,ꢀunlessꢀotherwiseꢀspecified.)
DD
SS
L
DD
A
SMALL-SIGNAL RESPONSE
OUTPUT VOLTAGE LOW (VOUT
vs. OUTPUT SINK CURRENT
)
OUTPUT VOLTAGE SWING HIGH
vs. TEMPERATURE
vs. TIME
toc19
toc17
toc18
600
120
100
80
60
40
20
0
550
500
450
400
350
300
250
200
150
100
50
VOUTN
RL = 2kΩ
VINSIDE
VBACKUP
RL = 10kΩ
0
0
5
10
15
20
25
30
-50
-20
10
40
70
100
130
TEMPERATURE (°C)
OUTPUT SINK CURRENT (mA)
SMALL-SIGNAL RESPONSE
vs. TIME
LARGE-SIGNAL RESPONSE
vs. TIME
toc20
toc21
No LOAD
VIN
No LOAD
VIN
1V/div
50mV/div
VOUT
VOUT
1V/div
50mV/div
1μs/div
1μs/div
STABILITY
STABILITY
vs. CAPACITIVE LOAD AND
RESISTIVE LOAD
vs. CAPACITIVE LOAD AND
ISOLATION RESISTOR
toc23
toc22
100
10
100
10
UNSTABLE
1
UNSTABLE
1
0.1
0.1
0.01
STABLE
0.01
0.001
STABLE
100
1000
10000
100000
100
1000
10000
100000
CAPACITIVE LOAD (pF)
CAPACITIVE LOAD (pF)
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MAX44242
20V, Low Input Bias-Current,
Low-Noise, Dual Op Amplifier
Typical Operating Characteristics (continued)
(V
= 10V, V = 0V, outputs have R ꢀ=ꢀ10kΩꢀtoꢀV /2. T ꢀ=ꢀ+25°C,ꢀunlessꢀotherwiseꢀspecified.)
DD
SS
L
DD
A
TOTAL HARMONIC DISTORTION
vs. INPUT FREQUENCY
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
vs. AMPLITUDE
toc25
toc26
0
0
-20
2VP-P INPUT
-10
-20
RLOAD = 10kΩ
-30
-40
-40
-50
1kHz INPUT
FREQUENCY
-60
-60
-70
-80
-80
R
LOAD = 1kΩ
-90
RLOAD = 600Ω
R
LOAD = 10kΩ
20kHz INPUT
FREQUENCY
-100
-110
-120
-100
-120
10
100
1000
10000
100000
0
2
4
6
8
10
FREQUENCY (Hz)
FREQUENCY (Hz)
CROSSTALK
vs. FREQUENCY
EMIRR
vs. FREQUENCY
toc27
toc29
0
-20
100
80
60
40
20
0
-40
-60
-80
-100
-120
1
10
100
1000 10000 100000 1000000
10
100
1000
10000
FREQUENCY (Hz)
FREQUENCY (MHz)
Analog Devices
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MAX44242
20V, Low Input Bias-Current,
Low-Noise, Dual Op Amplifier
Pin Configuration
TOP VIEW
+
MAX44242
1
2
3
4
8
7
6
5
OUTA
INA-
INA+
VSS
VDD
OUTB
INB-
INB+
8µMAX/SOT-23
Pin Description
PIN
1
NAME
OUTA
INA-
FUNCTION
Channel A Output
2
Channel A Negative Input
Channel A Positive Input
3
INA+
4
V
Negative Supply Voltage. Connect V to ground if single supply is used.
SS
SS
5
INB+
INB-
Channel B Positive Input
Channel B Negative Input
Channel B Output
6
7
OUTB
8
V
Positive Supply Voltage
DD
Integrated EMI Filter
Detailed Description
Electromagnetic interference (EMI) noise occurs at higher
frequency that results in malfunction or degradation of
electrical equipment.
Combining high input impedance, low input bias current,
wide bandwidth, and fast settling time, the MAX44242 is
an ideal amplifier for driving precision analog-to-digital
inputs and buffering digital-to-analog converter outputs.
The MAX44242 has an input EMI filter to avoid the output
from getting affected by radio frequency interference. The
EMI filter, composed of passive devices, presents signifi-
cant higher impedance to higher frequencies.
Input Bias Current
The MAX44242 features a high-impedance CMOS input
stage and a special ESD structure that allows low input
bias current operation at low-input, common-mode volt-
ages. Low input bias current is useful when interfacing
with high-ohmic or capacitive sensors and is beneficial for
designing transimpedance amplifiers for photodiode sen-
sors. This makes the device ideal for ground-referenced
medical and industrial sensor applications.
High Supply Voltage Range
The device features 1.2mA current consumption per
channel and a voltage supply range from either 2.7V to
20V single supply or ±1.35V to ±10V split supply.
Analog Devices
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MAX44242
20V, Low Input Bias-Current,
Low-Noise, Dual Op Amplifier
apply a small gain to the input voltage signal. Due to the
extremely high impedance of the sensor output, a low
input bias current with minimal temperature variation is
very important for these applications.
Typical Application Circuit
High-Impedance Sensor Application
High impedance sources like pH sensor, photodiodes in
applications require negligible input leakage currents to
the input transimpedance/buffer structure. The MAX44242
benefits with clean and precise signal conditioning due to
its input structure.
Transimpedance Amplifier
As shown in Figure 2, the noninverting pin is biased at 2V
with C2 added to bypass high-frequency noise. This bias
voltage to reverse biases the photodiode D1 at 2V which
is often enough to minimize the capacitance across the
The device interfaces to both current-output sensors
(photodiodes) (Figure 1), and high-impedance voltage
sources (piezoelectric sensors). For current output sen-
sors, a transimpedance amplifier is the most noise-effi-
cient method for converting the input signal to a voltage.
High-value feedback resistors are commonly chosen to
create large gains, while feedback capacitors help stabi-
lize the amplifier by cancelling any poles introduced in the
feedback loop by the highly capacitive sensor or cabling.
A combination of low-current noise and low-voltage noise
is important for these applications. Take care to calibrate
out photodiode dark current if DC accuracy is important.
The high bandwidth and slew rate also allow AC signal
processing in certain medical photodiode sensor applica-
tions such as pulse-oximetry. For voltage-output sensors,
a noninverting amplifier is typically used to buffer and/or
junction. Hence, the reverse current (I ) produced by the
R
photodiode as light photons are incident on it, a propor-
tional voltage is produced at the output of the amplifier by
the given relation:
V
= I × R1
R
OUT
The addition of C1 is to compensate for the instability
caused due to the additional capacitance at the input
(junction capacitance C and input capacitance of the op
j
amp C ), which results in loss of phase margin. More
IN
information about stabilizing the transimpedance amplifier
can be found in Application Note 5129: Stabilize Your
Transimpedance Amplifier.
C1
15nF
R1
100kΩ
+5V
MAX44242
5V
R2
30kΩ
R3
C2
20kΩ
10nF
Figure 1. High-Impedance Source/Sensor Preamp Application
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MAX44242
20V, Low Input Bias-Current,
Low-Noise, Dual Op Amplifier
Ordering Information
Package Information
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.
PIN-
TOP
PART
TEMP RANGE
PACKAGE MARK
MAX44242AKA+ -40ºC to +125ºC
MAX44242AUA+ -40ºC to +125ºC
8 SOT23
8 µMAX
AETK
—
PACKAGE
TYPE
PACKAGE OUTLINE
LAND
PATTERN NO.
+Denotes lead(Pb)-free/RoHS-compliant package.
CODE
K8+5
U8+1
NO.
8 SOT23
8 µMAX
21-0078
21-0036
90-0176
90-0092
Chip Information
PROCESS: BiCMOS
Analog Devices
│ 10
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MAX44242
20V, Low Input Bias-Current,
Low-Noise, Dual Op Amplifier
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
12/13
11/15
4/18
0
1
2
3
Initial release
—
8
Updated Pin Configuration diagram
Updated Typical Application Circuit
1
3/21
Updated Electrical Characteristics table
3
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is
assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that
may result from its use.Specifications subject to change without notice. No license is granted by implicationor
otherwise under any patent or patent rights of Analog Devices. Trademarks andregistered trademarks are the
property of their respective owners.
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│ 11
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