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MC1408L8

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Pinout/Connection Diagram

mc1408l8 Circuit

Serves as digitally programmable frequency source covering 10 to 2550 Hz for systems under microprocessor control. Frequency change is essentially instantaneous, assuring immediately valid data. Uses MC1408L8 8-bit monolithic D/A converter to supply constant current for charging C in negative direction. When capacitor voltage exceeds lower negative threshold voltage at pin 3 of LM311 high-impedance comparator A1, comparator changes state and sets 7476 flip-flop.This turns on Q1 through level-shifter Q2, discharging C until it exceeds higher threshold voltage at pin 2 of A2. Flip-flop then resets and C begins charging again. Second half of 7476 serves as divider. To cover above frequency range, values should be: R3.9K; R1 27K; R2 10K; R3 2.2K; C 0.1 μF. Circuit gives 8-bit accuracy. Design equations are presented in article.-A. Helfrick, Eight-Bit Frequency Source Suited for μP Control, EDN Magazine, Sept. 20, 1976, p 116 and118.

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PDF / Datasheet

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