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87C196CB Datasheet(PDF) 31 Page - Intel Corporation

Part No. 87C196CB
Description  20 MHz Advanced 16-Bit CHMOS Microcontroller with Integrated CAN 2.0
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Maker  INTEL [Intel Corporation]
Homepage  http://www.intel.com
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87C196CB Datasheet(HTML) 31 Page - Intel Corporation

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Production Datasheet
27
87C196CB - Automotive
5.4.1
A/D Characteristics
The sample and conversion time of the A/D converter in the 8-bit or 10-bit modes is programmed
by loading a byte into the AD_TIME Special Function Register. This allows optimizing the A/D
operation for specific applications. The AD_TIME register is functional for all possible values, but
the accuracy of the A/D converter is only guaranteed for the times specified in the operating
conditions table.
The value loaded into AD_TIME bits 5, 6, 7 determines the sample time, SAMP. The value loaded
into AD_TIME bits 0, 1, 2, 3 and 4 determines the bit conversion time, CONV. These bits, as well
as the equation for calculating the total conversion time, T, are shown in Figure 21.
Figure 21. AD_TIME 1FAFH:Byte
0
76
543
21
(SAMP)
4n + 1 state times
n = 1 to 7
(CONV)
n + 1 state times
n = 2 to 31
Equation: T = (SAMP) + Bx (CONV) + 2.5
T = total conversion time (states)
B = number of bits conversion (8 or 10)
n = programmed register value
Sample Time
Bit Conversion Time
The converter is ratiometric, so absolute accuracy is dependent on the accuracy and stability of
VREF. VREF must be close to VCC since it supplies both the resistor ladder and the analog portion of
the converter and input port pins. There is also an AD_TEST SFR that allows for conversion on
ANGND and VREF as well as adjusting the zero offset. The absolute error listed is without doing
any adjustments.
5.4.1.1
A/D Converter Specification
The specifications given assume adherence to the operating conditions section of this data sheet.
Testing is performed with VREF = 5.12 V and 20 MHz operating frequency. After a conversion is
started, the device is placed in IDLE mode until the conversion is complete.
Table 18. 10-Bit Mode A/D Operating Conditions
Symbol
Parameter
Min
Max
Units
T
Ambient Temperature
–40
+125
°C
V
Digital Supply Voltage
4.75
5.25
V
VREF
Analog Supply Voltage
4.75
5.25
V (1)
TSAM
Sample Time
2
µs (2)
TCONV
Conversion Time
15
18
µs (2)
FOSC
Oscillator Frequency
4
20
MHz
NOTES:
1. VREF must be within+0.5 V of VCC.
2.The value of AD_TIME is selected to meet these specifications.
A
CC


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