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MAX9945
38V, Low-Noise, MOS-Input, Low-Power Op Amp
Great Combination of Low Power and Low Noise in a Small Package
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Status
Active: In Production.
Description
The MAX9945 operational amplifier features an excellent combination of low operating power and low input voltage 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 current. The MAX9945 is unity-gain stable and is capable of rail-to-rail output voltage swing.
The MAX9945 is ideal for portable medical and industrial applications that require low noise analog front-ends for performance applications such as photodiode transimpedance 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).
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Data Sheet
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An evaluation kit is available: MAX9945EVKIT
Key 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/
 Low Input Current Noise
- 15nV/ 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)
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Applications/Uses
- Active Filters and Signal Processing
- Automatic Test Equipment (ATE)
- Chemical Sensor Interface
- Displays: Industrial, Front Panel, and Instrumentation
- High-Performance Audio Line Out
- Industrial Sensors and Instrumentation
- Industrial: Process Measurement and Control
- Medical Pulse Oximetry
- Panel Meters
- Photodiode Sensor Interface
- Power Meters
- Programmable Logic Controllers (PLCs)
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Key Specifications:
| Operational Amplifiers |
| Part Number |
Amps. |
Rail to Rail |
AVCL |
VSUPPLY (Total)
(V) |
VSUPPLY (Total)
(V) |
ICC per Amp.
(µA) |
ICC per Amp.
(µA) |
VOS
(µV) |
CMRR @DC
(dB) |
PSRR @DC
(dB) |
Unity Gain BW
(MHz) |
Slew Rate
(V/µs) |
en
(nV/√Hz) |
in
(pA/√Hz) |
Low Pwr. Shutdn |
Package/Pins |
Budgetary Price |
| min |
min |
max |
typ |
max |
max |
typ |
typ |
typ |
typ |
See Notes |
| MAX9945 |
1 |
Output Only |
1 |
4.75 |
38 |
400 |
700 |
5000 |
94 |
100 |
3 |
2.2 |
15 |
0.001 |
No |
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$0.83 @1k |
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See All Operational Amplifiers (160)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Typical Operating Circuit
More Information
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Information Index
Document Ref.: 19-4396
Rev 1;
2010-12-17
This page last modified: 2010-12-17
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