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Digitally_controlled_time_delay

2014-11-24 23:53  
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Digitally_controlled_time_delay
Digitally controlled time delay. This circuit generates a time delay controlled by the digital input of the AD7520. The current fed into the integrator's summing point at OUT 1 is determined by the D/A converter's input. The output of the integrator remains low until the trigger input of the 555tmergoes low. At that time the timer's output goes high, unclamping the output and permitting the integrator to change upward until it reaches 2/3VDD, at which time the timer's output goes low and the integrator is reset to zero. The time delay is D/D1REF×10V, where D is the fractional binary equivalent of the digital input word (courtesy Analog Devices, Inc.).