MAXIM MAX9943, MAX9944 User Manual
General Description
The MAX9943/MAX9944 is a family of high-voltage
amplifiers that offers precision, low drift, and low-power
consumption.
The MAX9943 (single) and MAX9944 (dual) op amps
offer 2.4MHz of gain-bandwidth product with only
550μA of supply current per amplifier.
The MAX9943/MAX9944 family has a wide power supply range operating from ±3V to ±19V dual supplies or
a 6V to 38V single supply.
The MAX9943/MAX9944 is ideal for sensor signal conditioning, high-performance industrial instrumentation and
loop-powered systems (e.g., 4mA–20mA transmitters).
The MAX9943 is offered in a space-saving 6-pin TDFN or
8-pin μMAX
®
package. The MAX9944 is offered in an
8-pin SO or an 8-pin TDFN package. These devices are
specified over the -40°C to +125°C automotive temperature range.
Applications
Sensor Interfaces
Loop-Powered Systems
Industrial Instrumentation
High-Voltage ATE
High-Performance ADC/DAC Input/Output
Amplifiers
Features
o Wide 6V to 38V Supply Range
o Low 100µV (max) Input Offset Voltage
o Low 0.4µV/°C Offset Drift
o Unity Gain Stable with 1nF Load Capacitance
o 2.4MHz Gain-Bandwidth Product
o 550µA Supply Current
o 20mA Output Current
o Rail-to-Rail Output
o Package Options
3mm x 5mm, 8-Pin µMAX or 3mm x 3mm, 6-Pin
TDFN Packages (Single)
5mm x 6mm, 8-Pin SO or 3mm x 3mm, 8-Pin
TDFN Packages (Dual)
MAX9943/MAX9944
High-Voltage, Precision, Low-Power Op Amps
________________________________________________________________
Maxim Integrated Products
1
19-4433; Rev 3; 4/11
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.
Package Detail
Ordering Information
+
Denotes a lead(Pb)-free/RoHS-compliant package.
*
EP = Exposed pad.
Capacitive Load vs. Resistive Load
μMAX is a registered trademark of Maxim Integrated Products, Inc.
Pin Configurations appear at end of data sheet.
PART TEMP RANGE
MAX9943AUA+ -40°C to +125°C 8 μMAX AACA
MAX9943ATT+ -40°C to +125°C 6 TDFN-EP* AUF
MAX9944ASA+ -40°C to +125°C 8 SO —
MAX9944ATA+ -40°C to +125°C 8 TDFN-EP* BLN
PINPACKAGE
MARK
TOP
100,000
MAX9943 toc17
10,000
(pF)
LOAD
C
1000
100
UNSTABLE
STABLE
100 100,000
1000 10,000
R
(Ω)
LOAD
TOP VIEW
1
OUT
2
V
EE
3
IN+
6 TDFN-EP
*EP = EXPOSED PAD.
MAX9943
*EP
TOP VIEW
V
6
CC
5
N.C.
4
IN-
MAX9943/MAX9944
High-Voltage, Precision, Low-Power Op Amps
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
Supply Voltage (VCCto VEE) ..................................-0.3V to +40V
All Other Pins (Note 1) .....................(V
EE
- 0.3V) to (VCC+ 0.3V)
OUT Short-Circuit Current Duration
8-Pin μMAX (V
CC
- VEE≤ 20V)...............................................3s
8-Pin μMAX (V
CC
- VEE> 20V) ................................Momentary
6-Pin TDFN (V
CC
- VEE≤ 20V) .............................................60s
6-Pin TDFN (V
CC
- VEE> 20V)...............................................2s
8-Pin SO (V
CC
- VEE≤ 20V) .................................................60s
8-Pin SO (V
CC
- VEE> 20V)...................................................2s
8-Pin TDFN (V
CC
- VEE≤ 20V) .............................................60s
8-Pin TDFN (V
CC
- VEE> 20V)...............................................2s
Continuous Input Current (Any Pins) ................................±20mA
Thermal Limits (Note 2)
Multiple Layer PCB
Continuous Power Dissipation (TA= +70°C)
8-Pin μMAX (derate 4.8mW/°C above +70°C) ...........387.8mW
6-Pin TDFN-EP (derate 23.8mW/°C above +70°C)..1904.8mW
8-Pin SO (derate 7.6mW/°C above +70°C)...................606.1W
8-Pin TDFN-EP (derate 24.4mW/°C above +70°C)..1951.2mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
ELECTRICAL CHARACTERISTICS
(VCC= 15V, VEE= -15V, VCM= 0V, RL= 10kΩ to GND, V
GND
= 0V, TA= -40°C to +125°C. Typical values are at TA= +25°C, unless
otherwise noted.) (Note 3)
Note 1: Operation is limited by thermal limits.
Note 2: 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
.
8 μMAX
Junction-to-Ambient Thermal Resistance (θ
JA
)......206.3°C/W
Junction-to-Ambient Case Resistance (θ
JC
) ...............42°C/W
6 TDFN-EP
Junction-to-Ambient Thermal Resistance (θ
JA
)...........42°C/W
Junction-to-Ambient Case Resistance (θ
JC
) .................9°C/W
8 SO
Junction-to-Ambient Thermal Resistance (θ
JA
).........132°C/W
Junction-to-Ambient Case Resistance (θ
JC
) ...............38°C/W
8 TDFN-EP
Junction-to-Ambient Thermal Resistance (θ
JA
)...........41°C/W
Junction-to-Ambient Case Resistance (θ
JC
) .................8°C/W
PACKAGE THERMAL CHARACTERISTICS (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DC CHARACTERISTICS
Operating Supply Voltage Range V
Quiescent Supply Current per
Amplifier
SUPPLY
I
CC
Guaranteed by PSRR test ±3 ±19 V
Power-Supply Rejection Ratio PSRR VS = ±3V to ±19V 105 130 dB
Input Offset Voltage V
Input Offset Voltage Drift TCV
Input Bias Current I
Input Offset Current I
Input Voltage Range V
IN+
OS
OS
BIAS
OS
, V
Common-Mode Rejection Ratio CMRR
TA = +25°C 20 100
TA = -40°C to +125°C 240
VEE + 0.3V ≤ VCM ≤ VCC - 1.8V 4 20
VEE ≤ VCM ≤ VCC - 1.8V 90
VEE ≤ VCM ≤ VCC - 1.8V 1 10 nA
Guaranteed by CMRR test,
IN-
T
VEE + 0.3V ≤ VCM ≤ VCC - 1.8V 105 125
V
550 950 μA
0.4 μV/°C
VCC -
= -40°C to +125°C
A
≤ VCM ≤ VCC - 1.8V 105
EE
V
EE
1.8
μV
nA
V
dB
MAX9943/MAX9944
High-Voltage, Precision, Low-Power Op Amps
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VCC= 15V, VEE= -15V, VCM= 0V, RL= 10kΩ to GND, V
GND
= 0V, TA= -40°C to +125°C. Typical values are at TA= +25°C, unless
otherwise noted.) (Note 3)
Note 3: All devices are 100% production tested at T
A
= +25°C. Temperature limits are guaranteed by design.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
-13.5V ≤ VO ≤ +13.5V, RL = 10kΩ,
T
-13.5V ≤ VO ≤ +13.5V, RL = 10kΩ,
T
Open-Loop Gain A
VOL
-12V ≤ V
T
-12V ≤ V
T
RL = 10kΩ
V
OH
RL = 600Ω
Output Voltage Swing
RL = 10kΩ
V
OL
RL = 600Ω
Short-Circuit Current I
SC
TA = +25°C60
TA = -40°C to +125°C 100
AC CHARACTERISTICS
Gain Bandwidth Product GBWP 2.4 MHz
Slew Rate SR -5V ≤ V
Input Voltage Noise Density e
n
f = 1kHz 17.6 nV/√Hz
Input Voltage Noise TOTAL NOISE 0.1Hz ≤ f ≤ 10Hz 500 nV
Input Current Noise Density I
Capacitive Loading C
n
LOAD
f = 1kHz 0.18 pA/√Hz
No sustained oscillation 1000 pF
= +25°C
A
= -40°C to +125°C
A
≤ +12V, R
O
= +25°C
A
≤ +12V, R
O
= -40°C to +85°C
A
= 600Ω,
L
= 600Ω,
L
115 130
100
100 110
90
V
-
CC
0.2
V
-
TA = +25°C
= -40°C to +85°CVCC - 2
T
A
CC
1.8
V
TA = +25°C
T
= -40°C to +85°C
A
≤ +5V 0.35 V/μs
OUT
V
V
EE
0.1
EE
1
EE
1.1
+
+
+
dB
V
mA
P-P
MAX9943/MAX9944
High-Voltage, Precision, Low-Power Op Amps
4 _______________________________________________________________________________________
Typical Operating Characteristics
(VCC= 15V, VEE= -15V, VCM= 0V, RL= 10kΩ to GND, V
GND
= 0V, TA= +25°C, unless otherwise noted.)
OFFSET VOLTAGE HISTOGRAM
25
20
15
10
FREQUENCY (%)
5
0
-60 -40 -30-50 -20 -10
OFFSET VOLTAGE (µV)
2010 30 40 50 60
0
MAX9943 toc01
FREQUENCY (%)
70
60
50
40
30
20
10
0
-0.3 -0.2
INPUT VOLTAGE OFFSET
DRIFT HISTOGRAM
MAX9943 toc02
-0.1
0
0.1
0.2
0.3
-0.25
-0.05
-0.15
VOS DRIFT (µV/°C)
0.05
0.15
0.25
SUPPLY CURRENT vs. SUPPLY VOLTAGE
700
650
600
550
500
450
SUPPLY CURRENT (µA)
400
350
300
6141810 22 26 30 34 38
SUPPLY VOLTAGE (V)
MAX9943 toc03
SUPPLY CURRENT vs. TEMPERATURE
800
700
600
500
SUPPLY CURRENT (µA)
400
300
-50 0-25 25 50 75 100 125
TEMPERATURE (°C)
OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
30
25
20
15
10
OFFSET VOLTAGE (µV)
5
MAX9943 toc04
MAX9943 toc06
OFFSET VOLTAGE vs. SUPPLY VOLTAGE
30
25
20
15
10
OFFSET VOLTAGE (µV)
5
0
61410 18 22 26 30 34 38
SUPPLY VOLTAGE (V)
OFFSET VOLTAGE vs. TEMPERATURE
100
80
60
40
20
OFFSET VOLTAGE (µV)
0
-20
MAX9943 toc05
MAX9943 toc07
0
-14 -2 2-10 -6 6 10 14
COMMON-MODE VOLTAGE (V)
-40
-50 0 25-25 50 75 100 125
TEMPERATURE (°C)
VOL vs. OUTPUT CURRENT
MAX9943 toc13
OUTPUT VOLTAGE (V)
010515202530
-12
-13
-14
-15
-16
TA = +85°C
TA = +125°C
TA = -40°C
TA = +25°C
OUTPUT CURRENT (mA)
MAX9943/MAX9944
High-Voltage, Precision, Low-Power Op Amps
_______________________________________________________________________________________ 5
Typical Operating Characteristics (continued)
(VCC= 15V, VEE= -15V, VCM= 0V, RL= 10kΩ to GND, V
GND
= 0V, TA= +25°C, unless otherwise noted.)
INPUT BIAS CURRENT
vs. COMMON-MODE VOLTAGE
3.0
2.5
2.0
1.5
1.0
INPUT BIAS CURRENT (nA)
0.5
0
-14 -2 2-10 -6 6 10 14
COMMON-MODE VOLTAGE (V)
COMMON-MODE REJECTION
140
130
120
110
100
CMRR (dB)
90
80
70
60
0.001 10,000
RATIO vs. FREQUENCY
10001000.01 0.1 1 10
FREQUENCY (kHz)
INPUT BIAS CURRENT
vs. SUPPLY VOLTAGE
3.0
MAX9943 toc08
2.5
2.0
1.5
1.0
INPUT BIAS CURRENT (nA)
0.5
0
61410 18 22 26 30 34 38
SUPPLY VOLTAGE (V)
POWER-SUPPLY REJECTION
RATIO vs. FREQUENCY
160
MAX9943 toc10
140
120
100
80
PSRR (dB)
60
40
20
0
0.001 10,000
FREQUENCY (kHz)
MAX9943 toc09
MAX9943 toc11
10001000.01 0.1 1 10
16
15
14
OUTPUT VOLTAGE (V)
13
12
010515202530
TA = -40°C
TA = +85°C
TA = +125°C
OUTPUT CURRENT (mA)
TA = +25°C
MAX9943 toc12
VOH vs. OUTPUT CURRENT
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