Applications Staff, October 1994 used control standard LM555 timer/osc

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Applications Staff, October 1994 used control standard LM555 timer/osc

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Controlling LM555 Astable Oscillator using POTs
Applications Staff, October 1994 used control standard LM555 timer/oscillator circuit configurations. These nonvolatile digital potentiometers allow frequency astable oscillator (for example) conveniently adjusted without need manually twist screwdriver adjustment potentiometer. typical application might which requires adjustable frequency source part some built test equipment. Figure shows typical connection astable mode operation. Typically, this mode, timing given Thigh 0.693(Ra Rb)C, Tlow 0.693(Rb)C. problem with this setup that duty cycle only approached when much greater than
AN47
Figure shows another astable oscillator configuration which takes advantage versatility these Xicor POTs. Notice here that consists series with that used. Instead connected output LM555 timer (U2). This configuration nearly duty cycle with; Thigh Tlow 0.693(R1 U1)C. 0.722
this circuit, CMOS ICM7555 timer used because very similar source sink capabilities, with component values shown produced duty cycle over range from 900Hz 30KHz.
TYPICAL ASTABLE OSCILLATOR
LM555
DISCHARGE OUTPUT THRESHOLD TRIGGER
Figure Typical Astable Oscillator Circuit
6584-1.1 3/27/95
Xicor, Inc. 1511 Buckeye Drive Milpitas, 95035 (408) 432-8888
AN47-1
Xicor
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NCRE
000PF
000PF
Figure X9C103 Astable Oscillator Configuration
6584-1.1 3/27/95
AN47-

Applications Staff, October 1994 used control standard LM555 timer/osc

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