R8C/20 Group, R8C/21 Group 18. A/D Converter
Rev.2.00 Aug 27, 2008 Page 371 of 458
REJ09B0250-0200
18.4 A/D Conversion Cycles
Figure 18.9 shows the A/D Conversion Cycles.
Figure 18.9 A/D Conversion Cycles
A/D Conversion Mode
Without Sample & Hold
Without Sample & Hold
With Sample & Hold
With Sample & Hold
8 bits
10 bits
8 bits
10 bits
Conversion
Time
Comparison
Time
Comparison
Time
End process
Sampling
Time
End processConversion time at the 1st bit
Sampling
Time
Conversion time at the 2nd
bit and the follows
49φAD 4φAD 2.0φAD 2.5φAD 2.5φAD 8.0φAD
59φAD 4φAD 2.0φAD 2.5φAD 2.5φAD 8.0φAD
28φAD 4φAD 2.5φAD 0.0φAD 2.5φAD 4.0φAD
33φAD 4φAD 2.5φAD 0.0φAD 2.5φAD 4.0φAD