Specifications

Sensors
Current, light, and proximity sensing
82 Maxim Industrial Solutions
Benefits
• Improves system’s signal-to-noise ratio
(SNR) for more accurate measurements
– 50fA low input-bias current
– 1fA/√Hz low input-current noise
– 15nV/√Hz low noise
• High-voltage robust design simplifies
mixed-voltage designs
– 4.75V to 38V single-supply voltage range
– ±2.4V to ±19V dual-supply voltage range
– Rail-to-rail output-voltage swing
MAX9945
The MAX9945 operational amplifier features an excellent combination
of low-operating power and low-input-voltage noise. MOS inputs
enable the MAX9945 to feature low 50fA input-bias currents and low
(15nV/√Hz) input-current noise. The MAX9945 simplifies the interface
between high-ohmic sensors or low-current TIA applications.
Maximize system accuracy in photodiode and high-ohmic sensor applications
IN-
IN+
OUT
V
EE
V
CC
PHOTODIODE
SIGNAL
CONDITIONING/
FILTERS
ADC
MAX9945
Highly accurate light-sensor interface features the MAX9945 op amp.