View mp8820 datasheet:

MP8820 8-Bit Analog-to-Digital Converter with an 8-Channel MUX FEATURES APPLICATIONS • Precision 7–Bit Plus Sign ADC • Servo Control • 8 Channel Analog Mux • Low Cost Audio Control • Single Reference to GND • Voice Acquisition • Input Referenced to User Supplied VMID • DNL= ±1/2 LSB, INL=± 1 LSB • Single Supply: 5 V • ESD Protection: 2000 V GENERAL DESCRIPTION The MP8820 is a precision 1.6 MHz sampling 7-bit plus sign to within 0.5 V of the supply rails, giving the MP8820 a wide range over which the effective channel gain can be adjusted. Analog-to-Digital Converter with an eight channel input mux and µP interface. The device has internal circuitry which receives The MP8820 uses a two-step flash conversion technique. the user supplied reference voltages VREF(+) and VREF(–)