ADS7803

® ADS7803 Autocalibrating, 4-Channel, 12-Bit ANALOG-TO-DIGITAL CONVERTER FEATURES q LOW POWER: 10mW plus Power Down q SIGNAL-TO-(NOISE + DISTORTION) RATIO OVER TEMPERATURE: 69dB min with fIN = 1kHz 66dB min with fIN = 50kHz q FAST CONVERSION TIME: 8.5µs Including Acquisition (117kHz Sampling Rate) q DC PERFORMANCE OVER TEMPERATURE: ±3/4 LSB max Total Error ±1/4 LSB max Channel Mismatch q FOUR-CHANNEL INPUT MULTIPLEXER q SINGLE SUPPLY: +5V q PIN COMPATIBLE WITH ADC7802 DESCRIPTION The ADS7803 is a monolithic CMOS 12-bit analogto-digital converter with internal sample/hold and fourchannel multiplexer. It is designed and tested for full dynamic performance with input signals to 50kHz. An autocalibration cycle guarantees a total unadjusted error within ±3/4LSB 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 easy to use in microprocessor applications. Conversion results are available in two bytes through an 8-bit three-state output bus. The ADS7803 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 Capacitor Array Sampling ADC Three-State Input/Output BUSY 8-Bit Data Bus VREF+ VREF– International Airport In...