參數(shù)資料
型號： MCHC705P6ACSDR2
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER
文件頁數(shù)： 107/130頁
文件大?。?/td> 1541K
代理商： MCHC705P6ACSDR2
Analog Subsystem
Advance Information
MC68HC705P6A — Rev. 2.0
78
Analog Subsystem
MOTOROLA
9.3 Analog Section
The following paragraphs describe 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 Reference Voltage (V
REFH
)
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, including
quantization; however, the accuracy of conversions is tested and
guaranteed only with external oscillator operation.
9.4 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.
相關(guān)PDF資料
PDF描述
MC68HC705P6AMP 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP28
MC68HC705P6CDW 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
MC68HC705P6P 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP28
MC68HC705P6DW 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
MC68HC705P6S 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, CDIP28
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