參數(shù)資料
型號(hào): mPD784035
廠商: NEC Corp.
英文描述: 16/8-BIT SINGLE-CHIP MICROCONTROLLER
中文描述: 16/8-BIT單片機(jī)
文件頁數(shù): 35/90頁
文件大?。?/td> 377K
代理商: MPD784035
μ
PD784031
35
8.7 D/A Converter
Two digital/analog (D/A) converter channels of voltage output type, having a resolution of 8 bits, are incorporated.
An R-2R resistor ladder system is used for conversion. By writing the value to be subject to D/A conversion in
the 8-bit D/A conversion value setting register (DACSn: n = 0, 1), the resulting analog value is output on ANOn
(n = 0, 1). The range of the output voltages is determined by the voltages applied to the AV
REF2
and AV
REF3
pins.
Because of its high output impedance, no current can be obtained from an output pin. When the load impedance
is low, insert a buffer amplifier between the load and the converter.
The impedance of the ANOn pin goes high while the RESET signal is low. DACSn is set to 0 after a reset
is released.
Figure 8-8. Block Diagram of D/A Converter
Selector
Internal bus
DACSn
DACEn
2R
2R
2R
2R
AV
REF3
AV
REF2
R
R
R
ANOn
Remark
n = 0, 1
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