參數(shù)資料
型號(hào): MC68HC05P18A
廠商: Motorola, Inc.
英文描述: Low Cost HCMOS Microcontroller(低成本、8位HCMOS微控制器)
中文描述: 低成本HCMOS微控制器(低成本,8位HCMOS微控制器)
文件頁(yè)數(shù): 92/130頁(yè)
文件大小: 1200K
代理商: MC68HC05P18A
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L
G
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Analog-to-Digital (A/D) Converter
Technical Data
MC68HC05P18A
92
Analog-to-Digital (A/D) Converter
MOTOROLA
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 V
REFH
supplying the high
reference voltage. Applying an input voltage equal to V
REFH
produces a
conversion result of $FF (full scale). Applying an input voltage equal to
V
SS
produces a conversion result of $00. An input voltage greater than
V
REFH
converts to $FF with no overflow indication. For ratiometric
conversions, V
REFH
should be at the same potential as the supply
voltage being used by the analog signal being measured and be
referenced to V
SS
.
11.3.2 Reference Supply Voltage (V
REFH
)
The reference supply for the A/D converter shares pin PC7 with port C.
The low reference is tied to the V
SS
pin internally. V
REFH
can be any
voltage between V
SS
and V
DD
; however, the accuracy of conversions is
tested and guaranteed only for V
REFH
= V
DD
.
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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