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Compact CMOS Op Amp Tailored for Smartphones and IoT

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August 01, 2024

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The continuous reduction in the size of smartphones and IoT devices has led to the demand for smaller components, including op amps, to accurately amplify small signals in high precision sensing applications. Achieving high accuracy in a miniaturized form factor has been a challenge for conventional op amps, but the TLR377GYZ from ROHM successfully balances miniaturization with precision by leveraging advanced circuit design, process, and packaging technologies.

The input offset voltage and noise performance of op amps are critical factors that can affect amplification accuracy. Traditionally, increasing the size of built-in transistors was a common method to suppress these issues, but it often compromised miniaturization. ROHM's proprietary circuits in the TLR377GYZ address this challenge by achieving a maximum offset voltage as low as 1mV without enlarging the transistors. Additionally, the op amp utilizes innovative process technology to reduce flicker noise and optimize resistive components for ultra-low noise performance.

One of the key advancements in the TLR377GYZ is the adoption of a WLCSP (Wafer Level Chip Scale Package) with a ball pitch of just 0.3mm, made possible by ROHM's original packaging technology. This packaging solution reduces the size of the op amp by approximately 69% compared to conventional products, offering a significant space-saving advantage for compact devices.

ROHM also provides an IC-mounted conversion board that can replace SSOP6 packages, facilitating easy replacement and initial evaluation for customers. Both the new op amp and the conversion board are available for purchase through online distributors, ensuring accessibility for developers and engineers looking to integrate high-precision amplification solutions into their designs.

Looking ahead, ROHM aims to further enhance op amp performance by focusing on reducing power consumption through proprietary ultra-low current consumption technology. The TLR377GYZ features a built-in shut down function to minimize power usage during standby mode, catering to the energy-efficient requirements of modern mobile devices. Additionally, the availability of high accuracy SPICE models, such as the ROHM Real Model, enables reliable verification and simulation, streamlining the application development process and reducing the need for prototyping rework.

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