參數(shù)資料
型號(hào): UPD784031Y
廠商: NEC Corp.
英文描述: 16-/8-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述: 16-/8-bit的單晶片微控制器
文件頁(yè)數(shù): 34/88頁(yè)
文件大小: 464K
代理商: UPD784031Y
34
μ
PD784031Y
7.7 D/A Converter
Two circuits of digital-to-analog (D/A) converters are provided. These D/A converters are of voltage output type and
have a resolution of 8 bits.
The conversion method is of R-2R resistor ladder type. By writing a value to be output to an 8-bit D/A conversion value
setting register (DACSn: n = 0 or 1), an analog value is output to the ANOn (n = 0 or 1) pin. The output voltage range is
determined by the voltage applied across the AV
REF2
and AV
REF3
pins.
Because the output impedance is high, no current can be extracted from the output. If the impedance of the load is low,
insert a buffer amplifier between the load and output pin.
The ANOn pin goes into a high-impedance state while the RESET signal is low. After releasing reset, DACSn is cleared
to 0.
Figure 7-8. Block Diagram of D/A Converter
Remark
n = 0 or 1
AV
REF2
AV
REF3
ANOn
2R
2R
R
2R
R
R
2R
DACSn
DACEn
Internal bus
Selector
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