Description

The MAX9945AUA+T is an instrumentation operational amplifier that offers low operating power with a combination of low input voltage noise. The device supports low input bias currents and input current noise and features MOS inputs. The MAX9945AUA+T accepts a wide range of supply voltages, ranging from 4.75V to 38V, and has a quiescent current of 400µA. Additionally, it is unity-gain stable and can support rail-to-rail output voltage swing. The MAX9945AUA+T is ideal for portable medical and industrial applications that require a low noise analog front-end for high-performance applications such as photodiode transimpedance and chemical sensor interface circuits.

Specifications and features

• Supply Voltage Range: +4.75V to +38V (single-supply), ±2.4V to ±19V (dual-supply)
• Low Quiescent Current: 400µA
• Low Input Bias Current: 50fA
• Low Input Current Noise: 1fA/√Hz
• Low Noise: 15nV/√Hz
• Unity-Gain Bandwidth: 3MHz
• Package: 6-pin TDFN (3mm x 3mm)
• Temperature Range: -40°C to +125°C

Application Scenarios

The MAX9945AUA+T is popularly used in:

• Medical pulse oximetry
• Photodiode sensor interface
• Industrial sensors and instrumentation
• Chemical sensor interface
• High-performance audio line out
• Active filters and signal processing

Comparison

• Low operating power
• Low input voltage noise
• MOS inputs enable low input bias currents and input current noise
• Wide supply voltage range (4.75V to 38V)
• Quiescent current of 400µA
• Unity-gain stable and can support rail-to-rail output voltage swing
• Specified over the automotive operating temperature range (-40°C to +125°C)
• Space-saving 6-pin TDFN package

No disadvantages have been reported for the MAX9945AUA+T electronic component model.