參數(shù)資料
型號： MC68HC805P18P
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, EEPROM, 2.1 MHz, MICROCONTROLLER, PDIP28
封裝： PLASTIC, DIP-28
文件頁數(shù)： 124/144頁
文件大?。?/td> 1292K
代理商： MC68HC805P18P
Advance Information
MC68HC(8)05P18 — Rev. 2.0
80
Analog-to-Digital (A/D) Converter
MOTOROLA
Analog-to-Digital (A/D) Converter
9.3 Analog Section
This section describes the operation and performance of analog
modules within the analog subsystem.
9.3.1 Ratiometric Conversion
The A/D converter is ratiometric, with pin VREFH supplying the high
reference voltage. Applying an input voltage equal to VREFH produces a
conversion result of $FF (full scale). Applying an input voltage equal to
VSS produces a conversion result of $00. An input voltage greater than
VREFH will convert to $FF with no overflow indication. For ratiometric
conversions, VREFH should be at the same potential as the supply
voltage being used by the analog signal being measured and referenced
to VSS.
9.3.2 VREFH
The reference supply for the A/D converter shares pin PC7 with port C.
The low reference is tied to the VSS pin internally. VREFH can be any
voltage between VSS and VDD; however, the accuracy of conversions is
tested and guaranteed only for VREFH = VDD.
9.3.3 Accuracy and Precision
The 8-bit conversion result is accurate to within
± 1 1/2 LSB (least
significant bit), including quantization; however, the accuracy of
conversions is tested and guaranteed only with external oscillator
operation.
9.3.4 Conversion Process
The A/D reference inputs are applied to a precision digital-to-analog
converter. Control logic drives the D/A and the analog output is
successively compared to the selected analog input which was sampled
at the beginning of the conversion cycle. The conversion process is
monotonic and has no missing codes.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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相關(guān)PDF資料
PDF描述
MC68HC805P18CDW 8-BIT, EEPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
MC68HC805P18DW 8-BIT, EEPROM, MICROCONTROLLER, PDSO28
MC68HC805P18CDW 8-BIT, EEPROM, MICROCONTROLLER, PDSO28
MC68HC805P18P 8-BIT, EEPROM, MICROCONTROLLER, PDIP28
MC68HC805P18MDW 8-BIT, EEPROM, MICROCONTROLLER, PDSO28
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