4_400_Hz_BIPOLAR

Published:2009/7/10 5:51:00 Author:May | From:SeekIC

Single 2240 serves as time-base generator with Rt determining frequency in range of 4-400 Hz. Digital output is converted to analog form by 7530 10-bit CMOS multiplying D/A converter. Reference voltage can be varied up to ±10 V to give variable-amplitude bipolar staircase output in same amplitude range, with 255 staircase steps corresponding to 8-bit count of 2240. Opamp A3 serves as current-to-voltage convener for changing ±1 mA output current of 7530 to ±10 V swing for staircase.-W. G. Jung, IC Timer, Cookbook, Howard W. Sams, Indianapolis, IN, 1977, p 224-226.



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