In recent years, electronic products using batteries as power sources have been widely used, and designers urgently require low-voltage analog circuits to reduce power consumption. Low-voltage, low-power, low-noise analog circuit design technology is becoming a research hotspot. From the perspective of energy conservation, low power consumption is not only a requirement for battery-driven portable devices,Even for the use of large-scale systems is also an urgent need, it can not only extend the use of equipment time, but also delay the aging of equipment to enhance equipment stability.
Awinic's new launch of the AWS795X2 series of ultra low power CMOS operational amplifier:
Including AWS79552, AWS79562 and AWS79572 three series products, with ultra-low power consumption, low input offset voltage, low voltage operation, rail-to-rail input and output excellent performance. The operational amplifier's unity gain is stable and has an ultra-low input bias current, which is very suitable for applications such as wearable devices, smoke alarms, CGM, gas detectors, and end-side AI.
AWS795X2 main parameters
AWS79552: 380nA per channel
AWS79562: 420nA per channel
AWS79572: 170nA per channel
AWS79552: 1.5mV (Max)
AWS79562: 0.2mV (Max)
AWS79572: 0.2mV (Max)
AWS79552: 1.5V/ms
AWS79562: 1.5V/ms
AWS79572: 0.34V/ms
AWS79552: 8kHz
AWS79562: 8kHz
AWS79572: 1.4kHz
AWS79552: ±12.5mA
AWS79562: ±12.5mA
AWS79572: ±11mA
Figure 1 AWS795X2 Package
AWS795X2 main application
Product highlight one: ultra-low quiescent current
AWS795X2 ultra-low power consumption greatly improves battery life, significantly prolongs battery life, improves user experience and enhances the stability of the device, especially in low-power scenarios such as blood glucose meters, heart rate meters, and environmental testing equipment.
Figure 2 Comparison of operational amplifier endurance
Product highlight two: support 1.4V low working voltage
AWS7952X low voltage 1.4V working capacity, further pressing battery discharge capacity, when the battery (such as button cell, lithium battery, dry battery) voltage drops to about 1.4V, AWS795X2 can still be directly powered by button cell without adding BOOST circuit, thus saving space and design cost.
Fig. 3 Low operating voltage
Introduction to the main application scenarios: three-terminal gas sensor amplifier application diagram
The following figure shows a simple micropower regulator circuit for a three-terminal non-biased CO sensor, but it is also suitable for many other types of three-terminal gas sensors or electrochemical cells. The basic sensor has three electrodes: a sensing or working electrode ("WE"), a counter electrode ("CE"), and a reference electrode ("RE").The current flows between CE and WE, and its magnitude is proportional to the detected concentration. The RE monitors the potential of the internal reference point. For unbiased sensors, The WE and RE electrodes must be kept at the same potential by adjusting the bias on CE.
Fig.4 Application diagram of three-terminal gas sensor amplifier
Main Application Scenario Introduction II: Transimpedance Amplification of Current Signal of Blood Glucose Meter
The following figure shows a simple microcircuit for the sensor of the blood glucose meter. The biological enzyme in the electrochemical sensor reacts with blood to generate a weak current signal, which flows through the RF resistor to generate a voltage, and the output voltage is detected by SOC to judge the blood glucose concentration.
Fig.5 Microcircuit of blood glucose meter sensor
Table 1 Selection Table of AWINIC Operational Amplimeter Products
Conclusion
AWINIC specializes in the design of high-performance mixed-signal, power-management, and signal-chain ICs, mastering core chip‑design technologies. The AWINIC operational‑amplifier product family will progressively introduce a range of premium products featuring high voltage, high precision, and zero drift, and is committed to providing customers with comprehensive products and solutions.
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