4 Conclusion

If more than just a distance measurement needs to be computed from the reflected pulse, an ADC can be an appropriate receiver solution. However, if only a distance measurement is needed, an ADC solution can be quite wasteful in terms of both power and cost. It would be highly advisable in this case to go with a comparator solution as part of the receiver in the ToF system as it is not only easier to integrate, but also allows further distances to be measured accurately at significantly less cost.

It is important to keep in mind a comparator’s minimum pulse width capabilities and input overdrive dispersion performance, as they are the most significant specs when selecting a comparator for a ToF system. A comparator’s minimum pulse width detection capability correlates directly to the maximum distance the ToF system can measure, while its input overdrive dispersion correlates directly to the accuracy of measurement over a range of distances. The TLV3604 is an excellent option as part of the receiver solution in a ToF system due to its impressive minimum pulse width capabilities and input overdrive dispersion performance. For more information on this part, including the datasheet, simulation tools, and EVM board, please visit https://www.ti.com/product/TLV3604.