Hamamatsu Photonics has introduced a new light-to-frequency output photo IC, aimed primarily to replace traditional CdS photoconductive cells, which have been used for many years in light sensor products, but are not compliant with new EU RoHS regulations.
The new RoHS compliant S9705 device consists of a photodiode, which is combined with a current-to-frequency conversion circuit fabricated using an in-house CMOS process. The output from the IC is a square wave, with frequency between pulses directly proportional to the incident light intensity This makes it possible to measure light by counting the pulses using a digital counter. The device has low noise and a wide dynamic range in excess of 100 000 and when combined with its high linearity, it is suitable for a wide range of light measurement applications.
The S9705 is ideal for applications such as brightness sensors for televisions and monitors, energy savers for liquid crystal displays, office and industrial lighting control, automatic contrast control functions as well as a wide variety of optical sensors and general light level measurement applications.
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