参数资料
型号: MCM16Y1BACFT16
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 16-BIT, MROM, MICROCONTROLLER, PQFP160
封装: QFP-160
文件页数: 132/138页
文件大小: 784K
代理商: MCM16Y1BACFT16
MC68HC16Y1
MOTOROLA
MC68HC16Y1TS/D
93
6.1 ADC Operation
ADC functions can be grouped into three basic subsystems: an analog front end, a digital control sec-
tion, and a bus interface. A block diagram of the converter follows.
Figure 13 Analog-to-Digital Converter Block Diagram
6.2 Analog Subsystem
The analog front end consists of a multiplexer, a buffer amplifier, a resistor-capacitor array, and a high-
gain comparator. The multiplexer selects one of eight internal or eight external signal sources for con-
version. The buffer amplifier protects the input channel from the relatively large capacitance of the RC
array. The resistor capacitor (RC) array performs two functions — it acts as a sample/hold circuit, and
it provides the digital-to-analog comparison output necessary for successive approximation conversion.
The comparator indicates whether each successive output of the RC array is higher or lower than the
sampled input.
SAR
RC ARRAY
AND
COMPARATOR
ANALOG
MUX
AND SAMPLE
BUFFER
CLK SELECT/
PRESCALER
PADA6/AN6
PADA5/AN5
PADA4/AN4
PADA3/AN3
PADA2/AN2
PADA1/AN1
PADA0/AN0
VRH
VRL
BUS INTERFACE UNIT
MODE
AND
TIMING
CONTROL
A/D BLOCK
RESULT 7
RESULT 6
RESULT 5
RESULT 4
RESULT 3
RESULT 2
RESULT 1
RESULT 0
PADA7/AN7
PORT A
DATA
REGISTER
AMPLIFIER
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