MAX9945AUA+ Maxim Integrated Products, MAX9945AUA+ Datasheet

IC OPAMP MOS-INPUT LP/LN 8-MSOP

MAX9945AUA+

Manufacturer Part Number
MAX9945AUA+
Description
IC OPAMP MOS-INPUT LP/LN 8-MSOP
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX9945AUA+

Amplifier Type
General Purpose
Number Of Circuits
1
Output Type
Rail-to-Rail
Slew Rate
2.2 V/µs
Gain Bandwidth Product
3MHz
Current - Input Bias
0.05pA
Voltage - Input Offset
600µV
Current - Supply
400µA
Current - Output / Channel
25mA
Voltage - Supply, Single/dual (±)
4.75 V ~ 38 V, ±2.4 V ~ 19 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Input Offset Voltage
+/- 0.6 V
Input Bias Current (max)
50 fA
Common Mode Rejection Ratio (min)
94 dB
Supply Current
850 uA
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 40 C
Input Voltage
- 0.3 V to + 40 V
Maximum Power Dissipation
387.8 mW
Mounting Style
SMD/SMT
Operating Temperature Range
- 40 C to + 125 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
-3db Bandwidth
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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
a space-saving, 6-pin TDFN package, and is specified
over the automotive operating temperature range
(-40°C to +125°C).
µMAX is a registered trademark of Maxim Integrated Products, Inc.
19-4398; Rev 1; 12/10
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.
Medical Pulse Oximetry
Photodiode Sensor Interface
Industrial Sensors and Instrumentation
Chemical Sensor Interface
High-Performance Audio Line Out
Active Filters and Signal Processing
________________________________________________________________ Maxim Integrated Products
General Description
PHOTODIODE
Applications
38V, Low-Noise, MOS-Input,
®
IN-
IN+
MAX9945
and
V
V
CC
EE
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/√
o 15nV/√
o 3MHz Unity-Gain Bandwidth
o Wide Temperature Range from -40°C to +125°C
o Available in Space-Saving, 6-Pin TDFN Package
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
MAX9945ATT+
MAX9945AUA+
(3mm x 3mm)
OUT
PART
Hz Low Input Current Noise
Low-Power Op Amp
Hz Low Noise
Typical Operating Circuit
CONDITIONING/
-40°C to +125°C 6 TDFN-EP*
-40°C to +125°C 8 µMAX
TEMP RANGE
FILTERS
SIGNAL
Ordering Information
ADC
PIN-
PACKAGE
Features
MARK
TOP
AUE
1

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MAX9945AUA+ Summary of contents

Page 1

... Hz Low Noise √ o 3MHz Unity-Gain Bandwidth o Wide Temperature Range from -40°C to +125°C ® and o Available in Space-Saving, 6-Pin TDFN Package (3mm x 3mm) Applications PART MAX9945ATT+ MAX9945AUA+ + Denotes a lead(Pb)-free/RoHS-compliant package Exposed pad IN- OUT MAX9945 IN Features Ordering Information PIN- ...

Page 2

Low-Noise, MOS-Input, Low-Power Op Amp ABSOLUTE MAXIMUM RATINGS Supply Voltage ( ..................................-0.3V to +40V CC EE IN+, IN-, OUT Voltage......................(V EE IN+ to IN- .............................................................................±12V OUT Short Circuit to Ground Duration....................................10s Continuous Input Current into Any ...

Page 3

ELECTRICAL CHARACTERISTICS (continued +15V -15V IN+ IN- unless otherwise noted.) (Note 2) PARAMETER SYMBOL Output Voltage Low Output Voltage High AC ELECTRICAL CHARACTERISTICS Input Current-Noise Density Input Voltage Noise ...

Page 4

Low-Noise, MOS-Input, Low-Power Op Amp (V = +15V -15V IN+ IN- unless otherwise noted.) QUIESCENT SUPPLY CURRENT vs. SUPPLY VOLTAGE AND TEMPERATURE 600 500 T = +125°C A 400 T ...

Page 5

V = -15V IN+ IN- unless otherwise noted.) INPUT OFFSET VOLTAGE vs. COMMON-MODE VOLTAGE 1000 800 600 400 200 0 -15 -10 -5 COMMON-MODE VOLTAGE (V) OPEN-LOOP GAIN vs. FREQUENCY ...

Page 6

Low-Noise, MOS-Input, Low-Power Op Amp (V = +15V -15V IN+ IN- unless otherwise noted.) OP-AMP STABILITY vs. CAPACITIVE AND RESISTIVE LOADS 10,000 UNSTABLE 1000 STABLE 100 10 10 100 PARALLEL ...

Page 7

PIN NAME TDFN-EP µMAX 1 6 OUT — — EP Detailed Description The MAX9945 features a combination of low input cur- ...

Page 8

Low-Noise, MOS-Input, Low-Power Op Amp IN+ Figure 1. Shielding the Inverting Input to Reduce Leakage For voltage-output sensors, a noninverting amplifier is typically used to buffer and/or apply a small gain to, the input voltage signal. Due to the ...

Page 9

Input Differential Voltage Protection During normal op-amp operation, the inverting and non- inverting inputs of the MAX9945 are at approximately the same voltage. The ±12V absolute maximum input differential voltage rating offers sufficient protection for most applications. If there is ...

Page 10

Low-Noise, MOS-Input, Low-Power Op Amp TOP VIEW + N.C. 1 IN- 2 MAX9945 IN ______________________________________________________________________________________ 8 N.C. OUT OUT IN+ 5 N.C. µMAX Pin Configurations + 1 6 ...

Page 11

For the latest package outline information and land patterns www.maxim-ic.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 ...

Page 12

Low-Noise, MOS-Input, Low-Power Op Amp For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix ...

Page 13

For the latest package outline information and land patterns www.maxim-ic.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 ...

Page 14

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2010 Maxim Integrated Products ...

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