ADC1251

ADC1251 Self-Calibrating 12-Bit Plus Sign A D Converter with Sample-and-Hold December 1994 ADC1251 Self-Calibrating 12-Bit Plus Sign A D Converter with Sample-and-Hold General Description The ADC1251 is a CMOS 12-bit plus sign successive approximation analog-to-digital converter On request the ADC1251 goes through a self-calibration cycle that adjusts for any zero full scale or linearity errors The ADC1251 also has the ability to go through an Auto-Zero cycle that corrects the zero error during every conversion The analog input to the ADC1251 is tracked and held by the internal circuitry so an external sample-and-hold is not required The ADC1251 has an S H control input which directly controls the track-and-hold state of the A D A unipolar analog input voltage range (0 to a 5V) or a bipolar range (b5V to a 5V) can be accommodated with g 5V supplies The 13-bit data result is available on the eight outputs of the ADC1251 in two bytes high-byte first and sign extended The digital inputs and outputs are compatible with TTL or CMOS logic levels Y Y Y Y 8-bit mP DSP interface Bipolar input range with a single a 5V reference No missing codes over temperature TTL MOS input output compatible Key Specifications Y Y Y Y Y Y Y Resolution Conversion Time Sampling Rate Linearity Error Zero Error Full Scale Error Power Consumption 12 bits plus sign 8 ms (max) 83 kHz (max) g 0 6 LSB ( g 0 0146%) (max) g 1 LSB (max) g 1 5 LSB (max) g 5V 113 mW (max) Applications Y Y Y Features Y Y Di...