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參數(shù)資料
| 型號： | P87LPC769HD512 |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 8位微控制器 |
| 英文描述： | IC-SM-8-BIT MCU |
| 中文描述： | 集成電路釤8位微控制器 |
| 文件頁數(shù)： | 16/61頁 |
| 文件大?。?/td> | 306K |
| 代理商： | P87LPC769HD512 |
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Philips Semiconductors
Preliminary specification
87LPC769
Low power, low price, low pin count (20 pin)
microcontroller with 4 kB OTP 8-bit A/D, and DAC
2001 Jan 11
13
Digital to Analog Converter (DAC) Outputs
The 87LPC769 provides a two channel, 8-bit DAC function. DAC0 is
also a part of the A/D Converter and it should not be enabled while
the A/D is active. Digital outputs must be disabled on the DAC
output pins while the corresponding DAC is enabled, as described in
the section Analog Functions.
The DACs use the power supply as the references: V
DD
as the
upper reference and V
SS
as the lower reference. The DAC output is
generated by a tap from a resistor ladder and is not buffered. The
maximum resistance to V
DD
or V
SS
from a DAC output is 10k
.
Care must be taken with the loading of the DAC outputs in order to
avoid distortion of the output voltage. DAC accuracy is affected by
noise generated on-chip and elsewhere in the application. Since the
87LPC769 power pins are used for the DAC references, the power
supply also affects the accuracy of the DAC outputs.
The ideal DAC output may be calculated as follows:
Result
(DAC Value
0.5)
V
DD
V
SS
256
where DAC value is the contents of the relevant DAC register:
DAC0 or DAC1.
SU01371
D/A CONVERTER
ENDACn
V
REF
+ = V
DD
DACn pin
V
REF
– = V
ss
ADCON
DACn
Figure 4. DAC Block Diagram
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