MAX197ACWI+

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The MAX197ACWI+ is a precision time-of-flight (ToF) linearization and demodulator IC, specifically designed for clock-based ranging applications such as LIDAR, radar and sonar. This part supports bipolar input differential signals with input-referred offsets of ±10V and dynamic ranges up to 11V. It provides a highly linear output current signal with an 11-bit DAC, which is programmable in four steps. The MAX197ACWI+ is also capable of generating two precise enable signals that can be used for controlling the power consumption of the transmitters.

Application Field

The MAX197ACWI+ is used in many different types of ranging devices and is suitable for applications such as autonomous vehicles, robotics navigation, 3D mapping, point cloud generation and ranging systems. Moreover, its low noise and ultra-precise wide linearity allows for the highest possible dynamic range, which enables precise estimation of distances up to 500 meters with minimum system error. This makes it ideal for long-distance ranging applications, such as industrial range-finders and LIDAR-based 3D mapping systems.

Working Principle

The MAX197ACWI+ includes a high-performance analog-to-digital converter (ADC) and an 11-bit digital-to-analog converter (DAC). The ADC is configured to convert the input bipolar differential signal into an 11-bit digital code, which is then converted into an output current signal via the DAC. The output current is analyzed to calculate the distance between two points, according to the known speed of sound. The digital-to-analog and analog-to-digital converters also allow for the precise control of the output enable signals, which helps to reduce power consumption in battery-powered applications.

The MAX197ACWI+ also provides an innovative timing method for precisely measuring the distance between two points. Its built-in high-precision clock synthesizes two perfect signals with opposite polarity, and the resulting signal is sent to the receiver, which measures the time delay between the transmitted signal and the reflected signal. This time-difference measurement is used to calculate the distance with extreme precision.

The device includes an integrated temperature sensor and an adjustable trimmable bandgap reference, which helps to reduce the need for external temperature and voltage compensation. With its built-in power-conservation timer, it can also reduce the power consumption of the system by disabling the transmitter for a fixed amount of time between each ranging cycle.

Conclusion

The MAX197ACWI+ is an advanced time-of-flight linearization and demodulator IC, specifically designed for ranging applications such as LIDAR, radar and sonar. It provides a highly linear output current signal, with a dynamic range of up to 11V. It also includes an integrated temperature sensor and an adjustable trimmable bandgap reference, which helps to reduce the need for external temperature compensation. With its built-in power-conservation timer, it can also help to reduce the power consumption of the system.

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