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參數(shù)資料
| 型號： | 8xC198 |
| 廠商： | Intel Corp. |
| 英文描述： | COMMERCIAL/EXPRESS CHMOS MICROCONTROLLER |
| 中文描述： | 商業(yè)/快遞CHMOS單片機(jī) |
| 文件頁數(shù)： | 14/19頁 |
| 文件大?。?/td> | 275K |
| 代理商： | 8XC198 |
8XC198
10-BIT AID CHARACTERISTICS
At a clock speed of 6 MHz or less, the clock prescal-
er should be disabled. This is accomplished by set-
ting IOC2.4
e
1.
At higher frequencies (greater than 6 MHz) the clock
prescaler should be turned on (IOC2.4
e
0) to allow
the comparator to settle.
The table below shows two different clock speeds
and their corresponding A/D conversion and sample
times.
State times are calculated as follows:
state time
e
2
f
XTAL1
The converter is ratiometric, so the absolute accura-
cy is directly dependent on the accuracy and stability
of V
REF
. V
REF
must be close to V
CC
since it supplies
both the resistor ladder and the digital section of the
converter.
See the MCS-96 A/D Converter Quick Reference
for definition of A/D terms.
Example Sample and Conversion Times
AID Clock
Prescaler
Clock Speed
(MHz)
Sample Time
(States)
Sample Time
at Clock
Speed (
m
s)
Conversion
Time
(States)
Conversion
Time at Clock
Speed (
m
s)
IOC2.4
e
0
x
ON
IOC2.4
e
1
x
OFF
16
15
1.875
156.5
19.6
6
8
2.667
89.5
29.8
A/D CONVERTER SPECIFICATIONS
Parameter
Typical(1)
Minimum
Maximum
Units
*
Notes
Resolution
1024
10
1024
10
Levels
Bits
Absolute Error
0
g
3
LSBs
Full Scale Error
0.25
g
0.50
b
0.25
g
0.50
1.5
g
2.5
LSBs
Zero Offset Error
LSBs
Non-Linearity Error
0
g
3
a
2
LSBs
Differential Non-Linearity Error
l
b
1
LSBs
Channel-to-Channel Matching
g
0.1
0
g
1
LSBs
Repeatability
g
0.25
LSBs
Temperature Coefficients:
Offset
Full Scale
Differential Non-Linearity
0.009
0.009
0.009
LSB/
§
C
LSB/
§
C
LSB/
§
C
dB
Off Isolation
b
60
2, 3
Feedthrough
b
60
b
60
dB
2
V
CC
Power Supply Rejection
Input Series Resistance
dB
2
750
1.2K
X
4
DC Input Leakage
0
3.0
m
A
Sample Time: Prescaler On
15
8
States
States
Prescaler Off
Sampling Capacitor
3
pF
NOTES:
*
An ‘‘LSB’’, as used here, has a value of approximately 5 mV.
1. Typical values are expected for most devices at 25
§
C but are not tested or guaranteed.
2. DC to 100 KHz.
3. Multiplexer Break-Before-Make Guaranteed.
4. Resistance from device pin, through internal MUX, to sample capacitor.
14
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