Analog Comparator - Freescale
Analog Comparator - Freescale
Analog Comparator - Freescale
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
►MCU = MC9S08QG8 (10-bit)<br />
►RADIN = 7kΩ max<br />
►CADIN = 5.5pF max<br />
►Sample time = 3.5 ADC clocks<br />
►ADC Clock = 8, 4, 2, 1, and<br />
0.5MHz<br />
Assume RAS =<br />
Calculate max CAS<br />
Assume CAS =<br />
Calculate max RAS<br />
<strong>Freescale</strong> and the <strong>Freescale</strong> logo are trademarks of <strong>Freescale</strong> Semiconductor, Inc. All other product or service names are<br />
the property of their respective owners. © <strong>Freescale</strong> Semiconductor, Inc. 2007-2008. 13<br />
RAS and CAS Example<br />
RAS<br />
RADIN<br />
+<br />
SAR<br />
VAS<br />
+<br />
- CAS<br />
VADIN<br />
-<br />
CADIN<br />
ADC Clock (MHz) 8 4 2 1 0.5<br />
Max Conv Freq (kHz) 400 200 100 50 25<br />
Sample Time (us) 0.44 0.88 1.75 3.5 7.0<br />
RAS (kΩ) 1 1 1 1 1<br />
CAS (pF) 1 8 21 47 100<br />
CAS (pF) 0 5 10 22 47<br />
RAS (kΩ) 2.6 3.0 6.6 8.3 9.0<br />
TM
Change language