BIPOLAR_ANALOG_TWO_QUADRANT

Published:2009/7/7 23:11:00 Author:May | From:SeekIC

Bipolar reference voltage for upper Precision Monolithics DAC-08 D/A converter modulates reference current by ±1.0 mA around quiescent current of 1.1 mA. Lower DAC-08 has same 1.1-mA reference current and effectively subtracts out quiescent 1.1 mA of upper reference current at all input codes since voltage across R3 varies between -10 V and 0 V. Output voltage E0 is thus product of digital input word and bipolar analog reference voltage.-J. Schoeff and D. Soderquist, Differential and Multiplying Digital to Analog Converter Applications, Precision Monolithics, Santa Clara, CA, 1976, AN-19, p 3.



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