19-4433; Rev 3; 4/11
High-Voltage, Precision, Low-Power Op Amps
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 sup-
ply range operating from ±3V to ±19V dual supplies or
a 6V to 38V single supply.
The MAX9943/MAX9944 is ideal for sensor signal condi-
tioning, 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 tempera-
ture range.
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)
Features
MAX9943/MAX9944
Ordering Information
PART
MAX9943AUA+
MAX9943ATT+
MAX9944ASA+
MAX9944ATA+
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-
PACKAGE
8 μMAX
6 TDFN-EP*
8 SO
8 TDFN-EP*
TOP
MARK
AACA
AUF
—
BLN
Applications
Sensor Interfaces
Loop-Powered Systems
Industrial Instrumentation
High-Voltage ATE
High-Performance ADC/DAC Input/Output
Amplifiers
μMAX is a registered trademark of Maxim Integrated Products, Inc.
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
Capacitive Load vs. Resistive Load
MAX9943 toc17
Package Detail
TOP VIEW
100,000
MAX9943
OUT
1
*EP
6
V
CC
10,000
C
LOAD
(pF)
UNSTABLE
V
EE
2
5
N.C.
1000
STABLE
IN+
3
4
IN-
100
100
1000
10,000
R
LOAD
(Ω)
100,000
TOP VIEW
6 TDFN-EP
*EP = EXPOSED PAD.
Pin Configurations appear at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
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.
High-Voltage, Precision, Low-Power Op Amps
MAX9943/MAX9944
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
CC
to V
EE
) ..................................-0.3V to +40V
All Other Pins (Note 1) .....................(V
EE
- 0.3V) to (V
CC
+ 0.3V)
OUT Short-Circuit Current Duration
8-Pin μMAX (V
CC
- V
EE
≤
20V)...............................................3s
8-Pin μMAX (V
CC
- V
EE
> 20V) ................................Momentary
6-Pin TDFN (V
CC
- V
EE
≤
20V) .............................................60s
6-Pin TDFN (V
CC
- V
EE
> 20V)...............................................2s
8-Pin SO (V
CC
- V
EE
≤
20V) .................................................60s
8-Pin SO (V
CC
- V
EE
> 20V)...................................................2s
8-Pin TDFN (V
CC
- V
EE
≤
20V) .............................................60s
8-Pin TDFN (V
CC
- V
EE
> 20V)...............................................2s
Note 1:
Operation is limited by thermal limits.
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.
Continuous Input Current (Any Pins) ................................±20mA
Thermal Limits (Note 2)
Multiple Layer PCB
Continuous Power Dissipation (T
A
= +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
PACKAGE THERMAL CHARACTERISTICS (Note 2)
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
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.
ELECTRICAL CHARACTERISTICS
(V
CC
= 15V, V
EE
= -15V, V
CM
= 0V, R
L
= 10kΩ to GND, V
GND
= 0V, T
A
= -40°C to +125°C. Typical values are at T
A
= +25°C, unless
otherwise noted.) (Note 3)
PARAMETER
DC CHARACTERISTICS
Operating Supply Voltage Range
Quiescent Supply Current per
Amplifier
Power-Supply Rejection Ratio
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Offset Current
Input Voltage Range
Common-Mode Rejection Ratio
V
SUPPLY
I
CC
PSRR
V
OS
TCV
OS
I
BIAS
I
OS
V
IN+
, V
IN-
CMRR
V
EE
+ 0.3V
≤
V
CM
≤
V
CC
- 1.8V
V
EE
≤
V
CM
≤
V
CC
- 1.8V
V
EE
≤
V
CM
≤
V
CC
- 1.8V
Guaranteed by CMRR test,
T
A
= -40°C to +125°C
V
EE
+ 0.3V
≤
V
CM
≤
V
CC
- 1.8V
V
EE
≤
V
CM
≤
V
CC
- 1.8V
V
EE
105
105
125
1
V
S
=
±3V
to ±19V
T
A
= +25°C
T
A
= -40°C to +125°C
0.4
4
20
90
10
V
CC
-
1.8
105
Guaranteed by PSRR test
±3
550
130
20
100
240
±19
950
V
μA
dB
μV
μV/°C
nA
nA
V
dB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
High-Voltage, Precision, Low-Power Op Amps
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 15V, V
EE
= -15V, V
CM
= 0V, R
L
= 10kΩ to GND, V
GND
= 0V, T
A
= -40°C to +125°C. Typical values are at T
A
= +25°C, unless
otherwise noted.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
-13.5V
≤
V
O
≤
+13.5V, R
L
= 10kΩ,
T
A
= +25°C
-13.5V
≤
V
O
≤
+13.5V, R
L
= 10kΩ,
T
A
= -40°C to +125°C
-12V
≤
V
O
≤
+12V, R
L
= 600Ω,
T
A
= +25°C
-12V
≤
V
O
≤
+12V, R
L
= 600Ω,
T
A
= -40°C to +85°C
R
L
= 10kΩ
V
OH
R
L
= 600Ω
Output Voltage Swing
R
L
= 10kΩ
V
OL
R
L
= 600Ω
T
A
= -40°C to +85°C
Short-Circuit Current
AC CHARACTERISTICS
Gain Bandwidth Product
Slew Rate
Input Voltage Noise Density
Input Voltage Noise
Input Current Noise Density
Capacitive Loading
GBWP
SR
e
n
I
n
C
LOAD
-5V
≤
V
OUT
≤
+5V
f = 1kHz
f = 1kHz
No sustained oscillation
2.4
0.35
17.6
500
0.18
1000
MHz
V/μs
nV/√Hz
nV
P-P
pA/√Hz
pF
I
SC
T
A
= +25°C
T
A
= -40°C to +125°C
60
100
T
A
= +25°C
T
A
= +25°C
T
A
= -40°C to +85°C
MIN
115
100
dB
100
90
V
CC
-
0.2
V
CC
-
1.8
V
CC
- 2
V
EE
+
0.1
V
EE
+
1
V
EE
+
1.1
V
110
TYP
130
MAX
UNITS
MAX9943/MAX9944
Open-Loop Gain
A
VOL
mA
TOTAL NOISE 0.1Hz
≤
f
≤
10Hz
Note 3:
All devices are 100% production tested at T
A
= +25°C. Temperature limits are guaranteed by design.
_______________________________________________________________________________________
3
High-Voltage, Precision, Low-Power Op Amps
MAX9943/MAX9944
Typical Operating Characteristics
(V
CC
= 15V, V
EE
= -15V, V
CM
= 0V, R
L
= 10kΩ to GND, V
GND
= 0V, T
A
= +25°C, unless otherwise noted.)
INPUT VOLTAGE OFFSET
DRIFT HISTOGRAM
MAX9943 toc01
MAX9943 toc02
OFFSET VOLTAGE HISTOGRAM
25
70
60
50
40
30
20
5
10
0
-60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60
OFFSET VOLTAGE (µV)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
650
SUPPLY CURRENT (µA)
600
550
500
450
400
350
MAX9943 toc03
700
20
FREQUENCY (%)
15
10
0
FREQUENCY (%)
-0.3 -0.2 -0.1
0
0.1
0.2
0.3
-0.25 -0.15 -0.05 0.05 0.15 0.25
V
OS
DRIFT (µV/°C)
300
6
10
14
18
22
26
30
34
38
SUPPLY VOLTAGE (V)
SUPPLY CURRENT vs. TEMPERATURE
MAX9943 toc04
OFFSET VOLTAGE vs. SUPPLY VOLTAGE
MAX9943 toc05
800
30
25
OFFSET VOLTAGE (µV)
20
15
10
5
0
700
SUPPLY CURRENT (µA)
600
500
400
300
-50
-25
0
25
50
75
100
125
TEMPERATURE (°C)
6
10
14
18
22
26
30
34
38
SUPPLY VOLTAGE (V)
OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
MAX9943 toc06
OFFSET VOLTAGE vs. TEMPERATURE
MAX9943 toc07
30
25
OFFSET VOLTAGE (µV)
20
15
10
5
0
-14
-10
-6
-2
2
6
10
100
80
OFFSET VOLTAGE (µV)
60
40
20
0
-20
-40
14
-50
-25
0
25
50
75
100
125
COMMON-MODE VOLTAGE (V)
TEMPERATURE (°C)
4
_______________________________________________________________________________________
High-Voltage, Precision, Low-Power Op Amps
Typical Operating Characteristics (continued)
(V
CC
= 15V, V
EE
= -15V, V
CM
= 0V, R
L
= 10kΩ to GND, V
GND
= 0V, T
A
= +25°C, unless otherwise noted.)
INPUT BIAS CURRENT
vs. COMMON-MODE VOLTAGE
MAX9943 toc08
MAX9943/MAX9944
INPUT BIAS CURRENT
vs. SUPPLY VOLTAGE
MAX9943 toc09
3.0
2.5
INPUT BIAS CURRENT (nA)
2.0
1.5
1.0
0.5
0
-14
-10
-6
-2
2
6
10
3.0
2.5
INPUT BIAS CURRENT (nA)
2.0
1.5
1.0
0.5
0
14
6
10
14
18
22
26
30
34
38
COMMON-MODE VOLTAGE (V)
SUPPLY VOLTAGE (V)
COMMON-MODE REJECTION
RATIO vs. FREQUENCY
MAX9943 toc10
POWER-SUPPLY REJECTION
RATIO vs. FREQUENCY
140
120
PSRR (dB)
100
80
60
40
20
0
0.001 0.01
0.1
1
10
100
1000 10,000
MAX9943 toc11
140
130
120
CMRR (dB)
110
100
90
80
70
60
0.001 0.01
0.1
1
10
100
160
1000 10,000
FREQUENCY (kHz)
FREQUENCY (kHz)
V
OH
vs. OUTPUT CURRENT
MAX9943 toc12
V
OL
vs. OUTPUT CURRENT
MAX9943 toc13
16
-12
15
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
T
A
= -40°C
T
A
= +25°C
-13
T
A
= +125°C
14
T
A
= +85°C
13
T
A
= +125°C
-14
T
A
= +85°C
-15
T
A
= -40°C
T
A
= +25°C
12
0
5
10
15
20
25
30
OUTPUT CURRENT (mA)
-16
0
5
10
15
20
25
30
OUTPUT CURRENT (mA)
_______________________________________________________________________________________
5
