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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX9945 Datasheet

Low-Power Op Amp

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19-4398; Rev 1; 12/10
38V, Low-Noise, MOS-Input,
Low-Power Op Amp
General Description
The MAX9945 operational amplifier features an excellent
combination of low operating power and low input volt-
age noise. In addition, MOS inputs enable the MAX9945
to feature low input bias currents and low input current
noise. The device accepts a wide supply voltage range
from 4.75V to 38V and draws a low 400µA quiescent cur-
rent. The MAX9945 is unity-gain stable and is capable of
rail-to-rail output voltage swing.
The MAX9945 is ideal for portable medical and industri-
al applications that require low noise analog front-ends
for performance applications such as photodiode trans-
impedance and chemical sensor interface circuits.
The MAX9945 is available in both an 8-pin µMAX® and
a space-saving, 6-pin TDFN package, and is specified
over the automotive operating temperature range
(-40°C to +125°C).
Applications
Medical Pulse Oximetry
Photodiode Sensor Interface
Industrial Sensors and Instrumentation
Chemical Sensor Interface
High-Performance Audio Line Out
Active Filters and Signal Processing
Features
o +4.75V to +38V Single-Supply Voltage Range
o ±2.4V to ±19V Dual-Supply Voltage Range
o Rail-to-Rail Output Voltage Swing
o 400µA Low Quiescent Current
o 50fA Low Input Bias Current
o 1fA/Hz Low Input Current Noise
o 15nV/Hz Low Noise
o 3MHz Unity-Gain Bandwidth
o Wide Temperature Range from -40°C to +125°C
o Available in Space-Saving, 6-Pin TDFN Package
(3mm x 3mm)
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
MAX9945ATT+ -40°C to +125°C 6 TDFN-EP*
MAX9945AUA+ -40°C to +125°C 8 µMAX
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
TOP
MARK
AUE
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Typical Operating Circuit
PHOTODIODE
VCC
IN-
MAX9945
IN+
VEE
OUT
SIGNAL
CONDITIONING/
FILTERS
ADC
________________________________________________________________ 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX9945 Datasheet

Low-Power Op Amp

No Preview Available !

38V, Low-Noise, MOS-Input,
Low-Power Op Amp
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC to VEE) ..................................-0.3V to +40V
IN+, IN-, OUT Voltage......................(VEE - 0.3V) to (VCC + 0.3V)
IN+ to IN- .............................................................................±12V
OUT Short Circuit to Ground Duration....................................10s
Continuous Input Current into Any Pin .............................±20mA
Continuous Power Dissipation (TA = +70°C)
6-Pin TDFN-EP (derate 23.8mW/°C above +70°C)
Multilayer Board ....................................................1904.8mW
8-Pin µMAX (derate 4.8mW/°C above +70°C)
Multilayer Board ......................................................387.8mW
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
Soldering Temperature ....................................................+260°C
PACKAGE THERMAL CHARACTERISTICS (Note 1)
TDFN-EP
Junction-to-Ambient Thermal Resistance (θJA) ............42°C/W
Junction-to-Case Thermal Resistance (θJC) ...................9°C/W
µMAX
Junction-to-Ambient Thermal Resistance (θJA) .......206.3°C/W
Junction-to-Case Thermal Resistance θJC ...................42°C/W
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.maxim-ic.com/thermal-tutorial.
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.
ELECTRICAL CHARACTERISTICS
(VCC = +15V, VEE = -15V, VIN+ = VIN- = VGND = 0V, ROUT = 100kΩ to GND, TA = -40°C to +125°C, typical values are at TA = +25°C,
unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
DC ELECTRICAL CHARACTERISTICS
CONDITIONS
Input Voltage Range
VIN+, VIN-
Guaranteed by
CMRR
TA = +25°C
TA = TMIN to TMAX
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current (Note 3)
Common-Mode Rejection Ratio
Open-Loop Gain
Output Short-Circuit Current
VOS
VOS - TC
IB
CMRR
AOL
ISC
TA = +25°C
TA = TMIN to TMAX
-40°C TA +25°C
-40°C TA +70°C
-40°C TA +85°C
-40°C TA +125°C
VCM = VEE to VCC - 1.2V,
TA = +25°C
VCM = VEE to VCC - 1.4V,
TA = TMIN to TMAX
VEE + 0.3V VOUT VCC - 0.3V,
ROUT = 100kΩ to GND
VEE + 0.75V VOUT VCC - 0.75V,
ROUT = 10kΩ to GND
MIN TYP MAX UNITS
VEE
VCC -
1.2
V
VEE
VCC -
1.4
±0.6
±5
±8
mV
2 µV/°C
50 150
fA
12 pA
55 pA
1.9 nA
78 94
78 94
dB
110 130
110 130
25
dB
mA
2 _______________________________________________________________________________________


Part Number MAX9945
Description Low-Power Op Amp
Maker Maxim Integrated Products
Total Page 14 Pages
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