In recent years, with the rise of the energy storage industry, the market demand for precision power supplies has been increasing. As a key component in current detection, operational amplifiers have set higher standards for metrics such as accuracy, response time, operating voltage threshold, bandwidth, and slew rate. To meet market demands, Audio Precision has launched the Dual-channel zero-drift operational amplifier AWS796X2 series.
The AWS796X2 series ultra high precision low-noise CMOS operational amplifier includes two series of products, AWS79632 and AWS79652, with ultra low input offset voltage, low voltage operation, rail to rail input and output, excellent bandwidth and slew rate, and ultra-low distortion excellent performance. The operational amplifier has stable unit gain and ultra-low input bias current, making it highly suitable for high-precision signal sampling, sensors, and other applications.
In low-current mode, the feedback signal from the sampling resistor in precision power supplies and modules is weak (1mA=68uV, R=68mΩ), requiring a sampling operational amplifier with high precision and low temperature drift.
Product Advantages: Ultra-Low Input Offset Voltage
The input offset voltage VOS is an additional voltage value that needs to be compensated at the input terminal to make the output of the operational amplifier zero. The size of VOS affects the accuracy and error of the entire system output. The AWS796X2 has a maximum input offset voltage of 8.5uV, which is very suitable for high-precision applications.
Figure 1 Output voltage versus input voltage variation curve
Product advantage: ultra-low equivalent input noise
Equivalent input noise, also known as 1/f noise, is a non periodic signal that cannot be calibrated. Therefore, for applications that require high precision, noise needs to be considered. 1/f noise is the main noise factor at low frequencies, which can cause significant output voltage offset when the circuit gain is large. Due to the AWS796X2 chopper architecture, 1/f noise can be suppressed, making this chip an ideal choice for high-precision DC applications. During the noise range of 0.1-10 Hz, the amplifier voltage noise from 0.1 Hz to 10 Hz is only 250 nVpp@VCC =5V， The following figure shows that the AWS796X2 can be used for ADC data acquisition with relatively stable output values.
Figure 2: The output value of AWS796X2 is relatively stable when used for ADC data acquisition
Main functional features
Wide working voltage range: 1.8V~5.5V
Low input offset voltage: 8.5uV (maximum)
dVOS/dT：0.03μV/℃@typ
Pressure swing rate: AWS79632:2.5V/μ S, AWS79652:5.5V/μ s
Low input bias current: 1pA
Track to track input and output
Low input noise density: AWS79632:13.5nV/√ Hz, AWS79652:12nV/√ Hz
Low static current: AWS79632: 600 μ A per channel, AWS79652: 1100 μ A per channel
Gain bandwidth product: AWS79632:4MHz, AWS79652:6MHz
Current filling and source current capability: AWS79632: ± 65mA, AWS79652: ± 87mA
Through continuous technological advancement and architectural innovation, the operational amplifier portfolio within Awinic's signal chain product line has evolved into a comprehensive range of high-performance products, covering general-purpose op-amps, high-precision op-amps, low-power op-amps, high-voltage comparators, and high-speed comparators.
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