SAB80C517A-N18 Siemens Semiconductor Group, SAB80C517A-N18 Datasheet - Page 34

• Manufacturer Part Number: SAB80C517A-N18
• Description: 8-Bit CMOS Single-Chip Microcontroller
• Manufacturer: Siemens Semiconductor Group

A/D Converter
In the SAB 80C517A a new high performance / high-speed 12-channel 10-bit A/D-Converter is
implemented. Its successive approximation technique provides 7 s con-version time (f
MHz). The conversion principle is upward compatible to the one used in the SAB 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 very
low offset voltages. The capacitor network is binary weighted providing genuine 10-bit
resolution.
The table below shows the sample time T
on f
f
12
16
18
Semiconductor Group
OSC
OSC
[MHz]
and a new prescaler (see also Bit ADCL in SFR ADCON 1).
Prescaler
16
16
8
8
8
16
1.5
0.75
2.0
1.0
–
1.125
f
ADC
S
[MHz]
and the conversion time T
33
Sample Time
T
2.67
5.33
2.0
4.0
–
3.55
S
[ s]
SAB 80C517A/83C517A-5
C
Conversion Time
(incl. sample time)
T
9.33
18.66
7.0
14.0
–
12.4
, which are dependend
C
[ s]
1994-05-01
OSC
= 16