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In the HT86XXX series, what is the relationship between DAH, DAL and VOL and the AUD output voltage ?

April 26, 2017AUD dah dal output relationship SERIES VOL voltage

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In the HT86XXX series, what is the relationship between DAH, DAL and VOL and the AUD output voltage ?

1 Answer

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Answer VOL determines the largest deviation value of the AUD output voltage from (1/2) VDDA. DAH and DAL determine the deviation from (1/2) VDDA. When VOL is not equal to 00H and with DAH, DAL > 80H, 00H, the output voltage will be greater than (1/2) VDDA. When DAH, DAL < 80H, 00H, the output voltage will be less than (1/2) VDDA. Example: When the highest 3 bits of VOL are 111, and when DAH = 0FFH and DAL = 0F0H, then the AUD output voltage is VDDA. When DAH = 00H and DAL = 00H, then the AUD output will be VSSA. When the highest 3 bits of VOL are 000, and with DAH and DAL at any value, the AUD output will be equal to 1/2 VDDA.