S83C198 View Datasheet(PDF) - Intel
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S83C198 Datasheet PDF : 19 Pages
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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
2
state time e
fXTAL1
The converter is ratiometric so the absolute accura-
cy is directly dependent on the accuracy and stability
of VREF VREF must be close to VCC 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
AID Clock
Prescaler
x IOC2 4e0 ON
x IOC2 4e1 OFF
Example Sample and Conversion Times
Clock Speed
(MHz)
Sample Time
(States)
Sample Time
at Clock
Speed (ms)
Conversion
Time
(States)
16
15
1 875
156 5
6
8
2 667
89 5
Conversion
Time at Clock
Speed (ms)
19 6
29 8
A D CONVERTER SPECIFICATIONS
Parameter
Typical(1)
Resolution
Absolute Error
Full Scale Error
Zero Offset Error
Non-Linearity Error
Differential Non-Linearity Error
Channel-to-Channel Matching
Repeatability
Temperature Coefficients
Offset
Full Scale
Differential Non-Linearity
Off Isolation
Feedthrough
VCC Power Supply Rejection
Input Series Resistance
DC Input Leakage
Sample Time Prescaler On
Prescaler Off
Sampling Capacitor
0 25 g0 50
b0 25 g0 50
1 5 g2 5
g0 1
g0 25
0 009
0 009
0 009
b60
b60
15
8
3
Minimum
1024
10
0
0
lb1
0
b60
750
0
Maximum
1024
10
g3
g3
a2
g1
1 2K
30
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
Units
Levels
Bits
LSBs
LSBs
LSBs
LSBs
LSBs
LSBs
LSBs
LSB C
LSB C
LSB C
dB
dB
dB
X
mA
States
States
pF
Notes
23
2
2
4
14
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