MAX9945 Datasheet, PDF (1/13 Pages) Maxim Integrated Products – 38V, Low-Noise, MOS-Input, Low-Power Op Amp

19-4398; Rev 0; 2/09
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
♦ +4.75V to +38V Single-Supply Voltage Range
♦ ±2.4V to ±19V Dual-Supply Voltage Range
♦ Rail-to-Rail Output Voltage Swing
♦ 400µA Low Quiescent Current
♦ 50fA Low Input Bias Current
♦ 1fA/√Hz Low Input Current Noise
♦ 15nV/√Hz Low Noise
♦ 3MHz Unity-Gain Bandwidth
♦ Wide Temperature Range from -40°C to +125°C
♦ 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
V_CC
IN-
OUT
MAX9945
IN+
V_EE
SIGNAL
CONDITIONING/
ADC
FILTERS
________________________________________________________________ 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.