8XC196MD View Datasheet(PDF) - Intel
Part Name
Description
Manufacturer
8XC196MD Datasheet PDF : 25 Pages
| |||
8XC196MD
A TO D CHARACTERISTICS
The sample and conversion time of the A D convert-
er 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
specificed in the operating conditions table
The value loaded into AD TIME bits 5 6 7 deter-
mines the sample time TSAM and is calculated us-
ing the following formula
SAM e (TSAM c FOSC) b 2
8
TSAM e Sample time ms
FOSC e Processor frequency MHz
SAM e Value loaded into AD TIME
bits 5 6 7
SAM must be in the range 1 through 7
The value loaded into AD TIME bits 0–5 deter-
mines the conversion time TCONV and is calculated
using the following formula
CONV e (TCONV c FOSC) b 3 b 1
2B
TCONV e Conversion time ms
FOSC e Processor frequency MHz
B e 8 for 8-bit conversion
B e 10 for 10-bit conversion
CONV e Value loaded into AD TIME
bits 0 – 5
CONV must be in the range 2 through 31
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 convert-
er 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 abso-
lute error listed is WITHOUT doing any adjustments
A D CONVERTER SPECIFICATION
The specifications given assume adherence to the
operating conditions section of this data sheet Test-
ing is performed with VREF e 5 12V and 16 0 MHz
operating frequency After a conversion is started
the device is placed in the IDLE mode until the con-
version is complete
19
|
|
Share Link: 