Chip scale CMOS op amp has standby mode
Rohm has developed a CMOS operational amplifier that is says is the smallest on the market and also adds a standby mode to save power.
The TLR377GYZ 1.8V – 5V, rail-to-rail CMOS op amp from Rohm in wafer scale packaging measures 0.88mm by 0.58mm, reducing the size by approximately 69% compared to conventional products and 46% over existing compact products. The WLCSP (Wafer Level Chip Scale Package) with a ball pitch of 0.3mm.
The op amp is optimized for amplifying signals from sensors such as temperature, pressure, flow rate, used in smartphones, small IoT devices, and similar applications, and the low input offset voltage and noise of the op amp contribute to higher accuracy in sensor circuits
The size of smartphones and IoT devices continues to decrease – requiring smaller components. To accurately amplify small signals as needed in high precision sensing, op amps must improve low input offset voltage and noise performance while continuing to shrink the form factor.
The TLR377GYZ succeeds in balancing miniaturization with high accuracy (which has been difficult to achieve with conventional op amps) with proprietary circuit design, process, and packaging technologies says Rohm.
The offset voltage and noise generation in an op amp degrade amplification accuracy and can be suppressed by increasing the size of the built-in transistors – but at the expense of miniaturization.
Rohm developed proprietary circuits which achieve a maximum offset voltage as low as 1mV without increasing the size of the transistors. In addition, proprietary process technology greatly reduces flicker noise, while ultra-low noise is achieved with an input equivalent noise voltage density of 12nV/√Hz by optimizing the resistive components. A shut down function required by mobile devices is also built in, reducing power consumption during standby mode.
A conversion board that can replace an op amp in an SSOP6 package is available (above) for initial evaluation and as a drop in replacement. Both the op amp and the conversion board are available for purchase through online distributors. In addition, the high accuracy SPICE model – called Rohm Real Model – is available on Rohm’s website for verification simulations.
The Real Models are new high accuracy SPICE models that use the original design models to faithfully reproduce the electrical and temperature characteristics of the actual IC, improving the match between the IC and simulation values. This ensures reliable verification, contributing to more efficient application development – for example by preventing rework after prototyping.
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