Infineon SAB 80C517A, SAB 83C517A-5 User's Manual ... - Keil
Infineon SAB 80C517A, SAB 83C517A-5 User's Manual ... - Keil
Infineon SAB 80C517A, SAB 83C517A-5 User's Manual ... - Keil
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5.2 10-bit A/D-Converter<br />
Semiconductor Group 5 - 3<br />
On-Chip Peripheral Components<br />
In the <strong>SAB</strong> <strong>80C517A</strong> is a new high performance / high speed 12-channel 10-bit A/D-Converter is<br />
implemented. Its successive approximation techniqe provides 7 μs conversion time (fOSC=16 MHz).<br />
The conversion principle is upward compatible to the one used in the <strong>SAB</strong> 80C517. The major<br />
components are shown in figure 5-1.<br />
The comparator is a fully differential comparator for a high power supply rejection ratio and very low<br />
offset voltages. The capacitor network is binary weighted providing 10-bit resolution.<br />
The table 5-1 below shows the sample time TS and the conversion time TC (including TS), which<br />
depend on fOSC and the selected prescaler (see also Bit ADCL in SFR ADCON 1).<br />
Table 5-1, ADC-Convertion Time<br />
fOSC[MHz] Prescaler fADC[MHz] TS [μs] TC [μs]<br />
(incl. TS) 12 ÷ 8 1.5 1.33 8<br />
÷ 16 0.75 2.8 16<br />
16 ÷ 8 2.0 2.0 7.0<br />
÷ 16 1.0 4.0 14.0<br />
18 ÷ 8 – – –<br />
÷ 16 1.125 3.555 12.4