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| 型號： | MC68HC05P18AMP |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP28 |
| 封裝： | PLASTIC, DIP-28 |
| 文件頁數(shù)： | 123/130頁 |
| 文件大小： | 1310K |
| 代理商： | MC68HC05P18AMP |
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Analog-to-Digital (A/D) Converter
Technical Data
MC68HC05P18A
Analog-to-Digital (A/D) Converter
11.3 Analog Section
The following paragraphs describe the operation and performance of
analog modules within the analog subsystem.
11.3.1 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 converts 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 be
referenced to VSS.
11.3.2 Reference Supply Voltage (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.
11.3.3 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.
11.4 Conversion Process
The A/D reference inputs are applied to a precision digital-to-analog
(D/A) converter. Control logic drives the D/A and the analog output is
successively compared to the selected analog input that was sampled at
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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)代理商/技術(shù)參數(shù) |
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| MC68HC05P18AP | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
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