參數(shù)資料
型號(hào): MC68HC705CL48
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 1.802 MHz, MICROCONTROLLER, PQFP112
封裝: TQFP-112
文件頁數(shù): 126/145頁
文件大小: 673K
代理商: MC68HC705CL48
June 6, 1997
GENERAL RELEASE SPECIFICATION
MC68HC05CL48
ANALOG TO DIGITAL CONVERTER
MOTOROLA
REV 2.0
10-1
SECTION 10
ANALOG TO DIGITAL CONVERTER
The MC68HC05CL48 includes a 8-channel, 8-bit, multiplexed input, successive
approximation A/D converter, with four of the input channels available on external
pins and another four internal channels are used for calibration purpose.
10.1
ANALOG SECTION
10.1.1 Ratiometric Conversion
The A/D is ratiometric, with two dedicated pins supplying the reference voltages
(VRH and VRL). An input voltage equal to VRH converts to $FF (full scale) and an
input voltage equal to VRL converts to $00. An input voltage greater than VRH will
convert to $FF with no overow indication. For ratiometric conversions, the source
of each analog input should use VRH as the supply voltage and be referenced to
VRL.
10.1.2 VRH and VRL
V
RH and VRL are generated internally on chip to reduce pin counts.
10.1.3 Accuracy And Precision
The 8-bit conversions shall be accurate to within
±11/2 LSB including quantization
when averaged over four readings.
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 successively
compared 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.
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