SAB80C515A-M18-T3 Siemens Semiconductor Group, SAB80C515A-M18-T3 Datasheet - Page 26

• Manufacturer Part Number: SAB80C515A-M18-T3
• Description: 8-Bit CMOS Single-Chip Microcontroller
• Manufacturer: Siemens Semiconductor Group

A/D Converter
In the SAB 80C515A a new high performance / high-speed 8-channel 10-bit A/D-Converter
(ADC) is implemented. Its successive approximation technique provides 7 s conversion time
(f
SAB 80C515. The main functional blocks are shown in figure 3.
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 genuine10-bit
resolution.
The table below shows the sample time T
on f
f
12
16
18
The ADC is clocked (f
2 MHz the prescaler (divide-by-2) has to be enabled (set Bit ADCL in SFR ADCON 1) when the
oscillator frequency (f
Semiconductor Group
OSC
OSC
OSC
= 16 MHz). The conversion principle is upward compatible to the one used in the
[MHz]
and a new prescaler.
Prescaler
16
16
8
8
8
16
OSC
ADC
) is higher than 16 MHz.
) with f
OSC
1.5
0.75
2.0
1.0
–
1.125
f
ADC
/8. Because of the ADC's maximum clock frequency of
S
[MHz]
and the conversion time T
25
Sample Time
T
2.67
5.33
2.0
1.0
–
3.55
S
[ s]
SAB 80C515A/83C515A-5
C
Conversion Time
(incl. sample time)
T
9.3
18.66
7.0
14.0
–
12.4
, which are dependend
C
[ s]