Low voltage and low-noise operational amplifier is a type of operational amplifier optimized for low power supply voltage (usually single power supply<5.5V) and extremely low signal noise. Its core is used to amplify weak signals (such as sensors and audio), while also adapting to battery powered scenarios.
Features:
1. Extremely low noise performance
Voltage noise: as low as 2.1 nV/√ Hz (such as LT6204).
Current noise: as low as 0.1 pA/√ Hz, suitable for high impedance sensors.
Low frequency noise: Small 1/f noise, pure signal.
2. Low voltage and wide voltage operation
Single power supply 1.8V~5.5V or dual power supply ± 0.9V~± 2.75V.
Directly compatible with batteries (3V/3.7V/5V), without the need for voltage stabilization.
3. Low power consumption and rail to rail
Static current: tens of μ A~1mA.
Rail to Rail Input/Output (RRIO): Maximizes dynamic range.
4. High precision
Low offset voltage:<1mV.
High CMRR/PSRR:>100dB, suppresses interference.
Applications：
1. Portable medical equipment
The signal front-end amplification of electrocardiogram (ECG), electroencephalography (EEG), and pulse oximeter.
2. Precision sensor interface
MV level signal conditioning for pressure, Hall, photoelectric, and MEMS sensors.
3. Consumer Electronics and Audio
Portable player, headphone amplifier, microphone preamplifier.
4. Battery powered instrument
Handheld multimeter, data collector, thermocouple signal amplifier.
5. Industry and Communication
Low side current detection, active filter, ADC driver.
