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參數(shù)資料
| 型號： | MC68HC05G3 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | QFP-80 |
| 文件頁數(shù)： | 21/128頁 |
| 文件大?。?/td> | 290K |
| 代理商： | MC68HC05G3 |
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Page 107
Section 10: A/D CONVERTER
MOTOROLA
MC68HC05G3 (705G4) Specification Rev. 1.1
SECTION 10
A/D CONVERTER
The MC68HC05G3 (705G4) includes an 8-channel, 8-bit, multiplexed input, successive
approximation A/D converter, with eight of the inputs available on external pins and four
additional internal channels.
10.1
ANALOG SECTION
10.1.1
RATIOMETRIC CONVERSION
The A/D is ratiometric, with two dedicated pins supplying the reference voltages (V
REFH
and V
REFL
)
. An input voltage equal to V
REFH converts to $FF (full scale) and an input
voltage equal to V
REFL converts to $00. An input voltage greater than VREFH will convert
to $FF with no overflow indication. For ratiometric conversions, the source of each analog
input should use V
REFH as the supply voltage and be referenced to VREFL.
10.1.2
V
REFH and VREFL
The reference supply for the converter uses two dedicated pins rather than being driven by
the system power supply lines because the voltage drops in the bonding wires of those
heavily loaded pins would degrade the accuracy of the A/D conversion. V
REFH and VREFL
can be any voltage between V
DD and VSS as long as VREFH > VREFL. However, the
accuracy of conversions is tested and guaranteed only for V
REFH = VDD and VREFL = VSS.
10.1.3
ACCURACY AND PRECISION
The 8-bit conversions shall be accurate to within
± 11/2 LSB, including quantization at
V
REFH = VDD = 5V and VREFL = VSS = 0V.
10.2
CONVERSION PROCESS
The A/D reference inputs are applied to a precision internal digital-to-analog converter.
Control logic drives this D/A and the analog output is compared successively to the
selected analog input which was sampled at the beginning of the conversion time. The
conversion process is monotonic and has no missing codes.
10.3
DIGITAL SECTION
10.3.1
CONVERSION TIMES
Each channel of conversion takes 32 clock cycles, which must be at a frequency equal to
or greater than 1 MHz.
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