MP8820

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 MP8820 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 175mW of power. Specified for operation over the industrial (–40 to +85°C) temperature range, the MP8820 is available ...