HT46R49 Holtek Semiconductor, HT46R49 Datasheet - Page 33

• Manufacturer Part Number: HT46R49
• Description: Cost-Effective A/D Type 8-Bit MCU
• Manufacturer: Holtek Semiconductor

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A/D Transfer Function
As the HT46R46 device contain an 8-bit A/D converter,
their full-scale converted digitized value is equal to
0FFH. Since the full-scale analog input value is equal to
the voltage, this gives a single bit analog input value of
V
9-bit A/D converter, their full-scale converted digitised
value is equal to 1FFH giving a single bit analog input
value of V
Rev. 1.30
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/256. For the other devices which each contain a
DD
/512. The following graphs show the ideal
Ideal A/D Transfer Function - Other Devices
Ideal A/D Transfer Function - HT46R46
HT46R46/C46/R47/C47/R48A/C48A/R49
33
transfer function between the analog input value and the
digitised output value for the A/D converters.
Note that to reduce the quantisation error, a 0.5 LSB off-
set is added to the A/D Converter input. Except for the
digitised zero value, the subsequent digitised values will
change at a point 0.5 LSB below where they would
change without the offset, and the last full scale digitised
value will change at a point 1.5 LSB below the V
June 5, 2008
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level.