Datasheet

C167CS-4R
C167CS-L
Data Sheet 60 V2.2, 2001-08
A/D Converter Characteristics
(Operating Conditions apply)
Table 13 A/D Converter Characteristics
Parameter Symbol Limit Values Unit Test
Condition
min. max.
Analog reference supply
V
AREF
SR 4.0 V
DD
+ 0.1 V
1)
1)
TUE is tested at V
AREF
= 5.0 V, V
AGND
= 0 V, V
DD
= 4.9 V. It is guaranteed by design for all other voltages
within the defined voltage range.
If the analog reference supply voltage exceeds the power supply voltage by up to 0.2 V
(i.e.
V
AREF
= V
DD
= +0.2 V) the maximum TUE is increased to ±3/11 LSB. This range is not 100% tested.
The specified TUE is guaranteed only if the absolute sum of input overload currents on Port 5 pins and P1H
pins (see
I
OV
specification) does not exceed 10 mA.
During the reset calibration sequence the maximum TUE may be ±4 LSB (±12 LSB for channels 16 … 23).
Analog reference ground V
AGND
SR V
SS
- 0.1 V
SS
+ 0.2 V –
Analog input voltage range
V
AIN
SR V
AGND
V
AREF
V
2)
2)
V
AIN
may exceed V
AGND
or V
AREF
up to the absolute maximum ratings. However, the conversion result in
these cases will be X000
H
or X3FF
H
, respectively.
Basic clock frequency f
BC
0.5 6.25 MHz
3)
3)
The limit values for f
BC
must not be exceeded when selecting the CPU frequency and the ADCTC setting.
Conversion time t
C
CC – 40 t
BC
+ t
S
+ 2
t
CPU
–
4)
t
CPU
= 1/f
CPU
4)
This parameter includes the sample time t
S
, the time for determining the digital result and the time to load the
result register with the conversion result.
Values for the basic clock
t
BC
depend on programming and can be taken from Table 14.
This parameter depends on the ADC control logic. It is not a real maximum value, but rather a fixum.
Calibration time after reset t
CAL
CC – 3328 t
BC
–
5)
Total unadjusted error TUE CC
1)
– ±2 LSB Channels
0 … 15
–
±10 LSB Channels
16 … 23
Internal resistance of
reference voltage source
R
AREF
SR – t
BC
/60
- 0.25
kΩ t
BC
in [ns]
6)7)
Internal resistance of
analog source
R
ASRC
SR – t
S
/450
- 0.25
kΩ t
S
in [ns]
7)8)
ADC input capacitance C
AIN
CC – 33 pF
7)