參數(shù)資料
型號: ST2202
廠商: Electronic Theatre Controls, Inc.
英文描述: 8 BIT Integrated Microcontroller with 256K Bytes ROM
中文描述: 8位微控制器集成256K字節(jié)ROM的
文件頁數(shù): 38/65頁
文件大?。?/td> 1946K
代理商: ST2202
Sitronix
15.2.2 Two-Pin Two Ended Mode (8-bit Accuracy)
Two-Pin Two-Ended mode is designed for use with a single
transistor amplifier. It requires two pin that
PSG0
and
PSG1
.
When the DAC value is positive,
PSG1
goes high with a
duty cycle proportional to the output value, while
PSG0
stays high. When the DAC value is negative,
PSG0
goes
low with a duty cycle proportional to the output value, while
PSG1
stays low. This mode offers a resolution of 8 bits.
ST2202
Ver 2.0a
38/65
2003-May-05
Figure 13-5 shows examples of DAC output waveforms with
different output values. Each pulse of the DAC is divided
into 128 segments per sample period. For a positive output
value x=0 to 127,
PSG1
goes high for X segments while
PSG0
stays high. For a negative output value x=0 to -127,
PSG0
goes low for |X| segments while
PSG1
stays low.
FIGURE 15-4 Two-Pin Two Ended Mode Wave-Form
High
Low
PSG0
DAC = X
Where X=0 to
1
27
DAC = 96
High
Low
PSG1
X
1
28-X
DAC = 32
DAC =
1
27
1
27
1
96
32
32
96
High
Low
PSG0
DAC = X
Where X=0 to -
1
28
DAC = 0
High
Low
PSG1
|X|
1
28+X
DAC = -48
DAC = -
1
28
48
80
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