ADC1242 Datasheet | National Semiconductor

Description The ADC1242 is a CMOS 12-bit plus sign successive approximation analog-to-digital converter On request the ADC1242 goes through a self-calibration cycle that adjusts positive linearity error to less than g 1 LSB full-scale error to less than g 3 LSB and zero error to less than g 2 LSB The ADC1242 also has the ability to go through an Auto-Zero cycle that corrects the zero error during every conversion The analog input to the ADC1242 is tracked and held by the internal circuitry and therefore does not require an external sample-and-hold A unipolar analog input voltage range (0V to a 5V) or a bipolar range ( b5V to a 5V) can be acmodated with g 5V supplies The 13-bit word on the outputs of the ADC1242 gives a 2’s plement representation of negative numbers The digital inputs and outputs are patible with TTL or CMOS logic levels Key Specifications Y Y Y Y Y Y Resolution Conversion Time Linearity Error Zero Error Positive Full Scale Error Power Consumption 12 Bits plus Sign 13 8 ms (max) g 1 LSB ( g 0 0244%) (max) g 2 LSB (max) g 3 LSB (max) 70 m W (max) Features Self-calibrating Internal sample-and-hold Bipolar input range with g 5V supplies and single a 5V reference No missing codes over temperature TTL MOS input output patible Standard 28-pin ceramic DIP Applications Digital Signal Processing High Resolution Process Control Instrumentation TRI-STATE is a registered trademark of National Semiconductor Corporation Simplified Schematic Connection Diagram Dual-In-Line Package TL H 11735 - 2 Top View Order Number ADC1242CIJ See NS Package Number J28A TL H 11735 - 1 C1995 National Semiconductor Corporation TL H 11735 RRD-B30M115 Printed in U S A .. Absolute Maximum Ratings (Notes 1 2) ESD Susceptability (Note 5) Soldering Information J Package (10 seconds) 2000V 300 C If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications...