MP8820 Datasheet | Exar

FEATURES - Precision 7- Bit Plus Sign ADC - 8 Channel Analog Mux - Single Reference to GND - Input Referenced to User Supplied VMID - DNL= ±1/2 LSB, INL=± 1 LSB - Single Supply: 5 V - ESD Protection: 2000 V 8-Bit Analog-to-Digital Converter with an 8-Channel MUX APPLICATIONS - Servo Control - Low Cost Audio Control - Voice Acquisition GENERAL DESCRIPTION The MP8820 is a precision 1.6 MHz sampling 7-bit plus sign Analog-to-Digital Converter with an eight channel input mux and µP interface. The device has internal circuitry which receives the user supplied reference voltages VREF(+) and VREF(- ), and generates the ADC reference voltages VMID (VREF(+) - VREF(- )). Since VREF(+) is internally buffered and VREF(- ) is generally ground, this structure allows the user to easily generate an input range biased about a user-supplied VMID from a grounded reference source. The internal ADC reference voltages are capable of swinging to within 0.5 V of the supply rails, giving the MP8820 a wide range over which the effective channel gain can be adjusted. The MP8820 uses a two-step flash conversion technique. The first section determines the sign and the 3 MSBs while the second segment converts the 4 LSBs. The ADC conversion begins when WR goes low and the data is valid 500 ns after the rising edge of WR. The MP8820 operates from a single 5V supply and consumes only 175m W of power. Specified for operation over the industrial (- 40 to +85°C) temperature range, the MP8820 is available in Surface Mount (SOIC) and Shrunk Small Outline (SSOP) packages. SIMPLIFIED BLOCK DIAGRAM VMID VREF(+) VREF(- ) + - G=1 + - G=1 + - G=1 AIN0-AIN7 8 8:1 MUX T/H VRT AIN VMID 8-Bit ADC Control 3 8 A0-A2 DB0-DB7 Rev....