The advancement of industrial intelligence and portable detection equipment has imposed stringent technical requirements on DC/low-frequency weak signal processing systems, including low offset, low power consumption, and industrial-grade wide temperature tolerance. Traditional operational amplifiers struggle to meet these application demands in terms of temperature drift control, power efficiency, and precision balance. Moreover, single-channel operation in multi-channel signal processing scenarios increases board-level component count and design costs.

The CBM8336 from Corebai Microelectronics is an industrial-grade dual-channel CMOS precision zero-drift operational amplifier featuring chopper-stabilized technology. Its core parameters and design characteristics are optimized for DC/low-frequency weak signal processing applications, supported by domestic mass-production supply chain capabilities. This makes it an ideal domestic solution for precision operational amplifiers in such scenarios.

The CBM8336 utilizes chopper-stabilized technology to deliver industrial-grade precision measurement input characteristics. Under standard operating conditions of Vₛ=5V and Tₐ=25℃, the device exhibits a maximum input offset voltage of 30μV with typical offset voltage drift of 50nV/℃. Operating across the full temperature range eliminates the need for additional system-level calibration circuits, simplifying hardware design while reducing calibration-related costs. With a typical input bias current of 20pA, it directly interfaces with high-impedance sensors such as piezoelectric and capacitive types without requiring extra impedance matching circuits. Featuring a common-mode rejection ratio (CMRR) ≥110dB and power supply rejection ratio (PSRR) ≥115dB, the device effectively suppresses common-mode interference and power supply ripple in industrial environments, ensuring stable signal measurements. Its direct ADC driver architecture eliminates differential linearity loss and streamlines hardware layout for front-end signal conditioning in analog-to-digital conversion systems.

The device is designed with balanced power consumption and supply specifications to meet the dual requirements of portable devices and industrial instruments. With a typical single-channel static current of 25μA, its micro-power design effectively extends battery life for portable testing equipment while reducing power design challenges. Supporting single-supply voltage ranges of 1.8V–5.5V and dual-supply ±0.9V–±2.75V wide voltage tolerance, it ensures compatibility with both low-voltage lithium batteries and standard industrial power systems without requiring additional voltage conversion modules. Featuring rail-to-rail input/output characteristics, the device supports input common-mode voltages from VSS-0.1V to VDD+0.1V. Under high-impedance loads, the output swing remains just 5mV from the power rail, significantly enhancing signal dynamic range in low-voltage applications and minimizing peripheral component requirements for level matching.

The CBM8336 features a wide-temperature industrial-grade design, engineered for demanding industrial environments. Operating reliably across-40°C to +125°C without requiring additional temperature control protection, it maintains stable performance throughout the entire temperature range. With built-in RF EMI filtering, it provides ESD and EMI protection equivalent to 6kV for human models and 400V for machine models, eliminating the need for external components. Featuring a typical output short-circuit current of 20mA and a maximum output current of 30mA, its short-circuit protection mechanism effectively prevents device damage caused by abnormal loads, ensuring enhanced operational stability.

The hardware design of the device aligns with standard engineering R&D workflows, simplifying both design and production. It features gain-stable design without external compensation networks, enabling direct construction of fundamental circuits like amplifiers and followers. To address oscillation issues common in capacitor load-driven systems, two standardized solutions are provided: a series isolation resistor and a feedforward compensation circuit. Available in three packages (SOP-8, MSOP-8, and DFN-8) with unified pin functions, the design accommodates conventional, compact, and ultra-compact board-level space requirements. The reusable design solutions and RoHS-compliant packaging ensure compatibility with standard industrial production processes.

application area

The CBM8336 core is specifically designed for DC/low-frequency weak signal processing applications, including sensor signal conditioning, industrial IoT sensor nodes, and pressure/temperature sensing measurement systems. It also meets the hardware design requirements of related products such as electronic scales, handheld testing devices, battery-powered precision detection instruments, and industrial precision instruments.