This part is a kind of semiconductor called ADC0809.

Function of this product has 8-Bit uP Compatible A/D Converters with 8-Channel Multiplexer.

Manufacturers : National Semiconductor

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Some of the text within the PDF file :

ADC0808/ADC0809 8-Bit μP Compatible A/D Converters with 8-Channel Multiplexer ADC0808/ADC0809 July 8, 2009 8-Bit μP Compatible A/D Converters with 8-Channel Multiplexer General Description The ADC0808, ADC0809 data acquisition component is a monolithic CMOS device with an 8-bit analog-to-digital converter, 8-channel multiplexer and microprocessor compatible control logic. The 8-bit A/D converter uses successive approximation as the conversion technique. The converter features a high impedance chopper stabilized comparator, a 256R voltage divider with analog switch tree and a successive approximation register. The 8-channel multiplexer can directly access any of 8-single-ended analog signals. The device eliminates the need for external zero and full-scale adjustments. Easy interfacing [ ... ]

ADC0809 PDF Datasheet Download