ADC7802

® ADC7802 Autocalibrating, 4-Channel, 12-Bit ANALOG-TO-DIGITAL CONVERTER FEATURES q TOTAL UNADJUSTED ERROR ≤ 1/2LSB OVER FULL TEMPERATURE RANGE q FOUR-CHANNEL INPUT MULTIPLEXER q LOW POWER: 10mW plus Power Down Mode q SINGLE SUPPLY: +5V q FAST CONVERSION TIME: 8.5µs Including Acquisition q AUTOCAL: No Offset or Gain Adjust Required q UNIPOLAR INPUTS: 0V to 5V q MICROPROCESSOR-COMPATIBLE INTERFACE q INTERNAL SAMPLE/HOLD DESCRIPTION The ADC7802 is a monolithic CMOS 12-bit A/D converter with internal sample/hold and four-channel multiplexer. An autocalibration cycle, occurring automatically at power on, guarantees a total unadjusted error within ±1/2LSB over the specified temperature range, eliminating the need for offset or gain adjustment. The 5V single-supply requirements and standard CS, RD, and WR control signals make the part very easy to use in microprocessor applications. Conversion results are available in two bytes through an 8bit three-state output bus. The ADC7802 is available in a 28-pin plastic DIP and 28-lead PLCC, fully specified for operation over the industrial –40°C to +85°C temperature range. A0 A1 Address Latch and Decoder Calibration Microcontroller and Memory Clock Control Logic CS RD WR SFR AIN0 AIN1 AIN2 AIN3 Analog Multiplexer BUSY Capacitor Array Sampling ADC Three-State Input/Output 8-Bit Data Bus VREF + VREF – International Airport Industrial Park Mailing Address: PO Box 11400 Tel: (520) 746-1111 Twx: 910-952-1111 Cable: BBRCORP ...