ST2202A datasheet(39/75 Pages) SITRONIX

39 / 75 page

ST2202A

Ver 2.5

39/75

9/16/2008

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.

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 127

DAC = 96

High

Low

PSG1

128-X

DAC = 32

DAC = 127

127

High

Low

PSG0

DAC = X

Where X=0 to -128

DAC = 0

High

Low

PSG1

|X|

128+X

DAC = -48

DAC = -128

ST2202A Datasheet(PDF) 39 Page - Sitronix Technology Co., Ltd.

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