High-Performance SAB 80C517A/83C517A-5 8-Bit CMOS Single ...
High-Performance SAB 80C517A/83C517A-5 8-Bit CMOS Single ...
High-Performance SAB 80C517A/83C517A-5 8-Bit CMOS Single ...
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<strong>SAB</strong> <strong>80C517A</strong>/<strong>83C517A</strong>-5A/D ConverterIn the <strong>SAB</strong> <strong>80C517A</strong> a new high performance / high-speed 12-channel 10-bit A/D-Converter isimplemented. Its successive approximation technique provides 7 µs con-version time (f OSC =16 MHz). The conversion principle is upward compatible to the one used in the <strong>SAB</strong> 80C517.The main functional blocks are shown in figure 4.The comparator is a fully differential comparator for a high power supply rejection ratio and verylow offset voltages. The capacitor network is binary weighted providing genuine 10-bitresolution.The table below shows the sample time T S and the conversion time T C , which are dependendon f OSC and a new prescaler (see also <strong>Bit</strong> ADCL in SFR ADCON 1).f OSC [MHz] Prescaler f ADC [MHz] Sample TimeT S [µs]Conversion Time(incl. sample time)T C [µs]12 ÷ 8 1.5 2.67 9.33÷ 16 0.75 5.33 18.6616 ÷ 8 2.0 2.0 7.0÷ 16 1.0 4.0 14.018 ÷ 8 – – –÷ 16 1.125 3.55 12.4Semiconductor Group 33
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