SAB-C167CR-LM A/d Converter Computation Table - Infineon Technologies AG

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SAB-C167CR-LM

Manufacturer Part Number
SAB-C167CR-LM
Description
16-bit microcontroller with 2x2 KByte RAM
Manufacturer
Infineon Technologies AG
Datasheet
8)
During the sample time the input capacitance
internal resistance of the analog source must allow the capacitance to reach its final voltage level within
After the end of the sample time
Values for the sample time
t
S
Sample time and conversion time of the C167CR’s A/D Converter are programmable.
Table 13
should be used to calculate the above timings.
f
The limit values for
must not be exceeded when selecting ADCTC.
BC
Table 13

A/D Converter Computation Table

ADCON.15|14
A/D Converter
(ADCTC)
Basic clock
f
00
CPU
f
01
CPU
f
10
CPU
f
11
CPU
Converter Timing Example:
f
Assumptions:
CPU
f
Basic clock
BC
t
Sample time
S
t
Conversion time
C
Data Sheet
C
can be charged/discharged by the external source. The
AIN
t
, changes of the analog input voltage have no effect on the conversion result.
S
depend on programming and can be taken from
ADCON.13|12
f
(ADSTC)
BC
/ 4
00
/ 2
01
/ 16
10
/ 8
11
t
= 25 MHz (i.e.
= 40 ns), ADCTC = ‘00’, ADSTC = ‘00’.
CPU
f
=
/ 4 = 6.25 MHz, i.e.
CPU
× 8 = 1280 ns.
t
=
BC
= (1280 + 6400 + 80) ns = 7.8 µ s.
t
t
t
=
+ 40
+ 2
S
BC
CPU
55
C167CR
C167SR
Table
13.
Sample time
t
S
× 8
t
BC
× 16
t
BC
× 32
t
BC
× 64
t
BC
t
= 160 ns.
BC
V3.2, 2001-07
t
.
S

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