參數(shù)資料
型號(hào): SAB80C517A-N18
廠商: SIEMENS A G
元件分類: 微控制器/微處理器
英文描述: 8-Bit CMOS Single-Chip Microcontroller
中文描述: 8-BIT, 18 MHz, MICROCONTROLLER, PQCC84
文件頁(yè)數(shù): 34/77頁(yè)
文件大?。?/td> 1358K
代理商: SAB80C517A-N18
SAB 80C517A/83C517A-5
Semiconductor Group
33
1994-05-01
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
μ
s con-version time (
f
OSC
= 16
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
S
and the conversion time
T
C
, which are dependend
on
f
OSC
and a new prescaler (see also Bit ADCL in SFR ADCON 1).
f
OSC
[MHz]
Prescaler
f
ADC
[MHz]
Sample Time
T
S
[
μ
s]
Conversion Time
(incl. sample time)
T
C
[
μ
s]
12
÷
8
1.5
2.67
9.33
÷
16
0.75
5.33
18.66
16
÷
8
2.0
2.0
7.0
÷
16
1.0
4.0
14.0
18
÷
8
÷
16
1.125
3.55
12.4
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