Rainbow Electronics MAX9945 - Manual

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)
MAX9945
38V, Low-Noise, MOS-Input,
Low-Power Op Amp
________________________________________________________________ Maxim Integrated Products 1
19-4398; Rev 0; 2/09
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.
Ordering Information
PART TEMP RANGE
PIN-
PACKAGE TOP
MARK
MAX9945ATT+ -40°C to +125°C 6 TDFN-EP* AUE
MAX9945AUA+ -40°C to +125°C 8 µMAX —
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
IN-
IN+
OUT
V EE
V
CC
PHOTODIODE
SIGNAL
CONDITIONING/
FILTERS
ADC
MAX9945
Typical Operating Circuit