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LS1240A Datasheet(PDF) 2 Page - STMicroelectronics |
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LS1240A Datasheet(HTML) 2 Page - STMicroelectronics |
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2 / 7 page  Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) Block diagram and test circuit LS1240 2/9 1 Block diagram and test circuit Figure 1. LS1240 block diagram Figure 2. Test circuit Rectifier bridge Threshold circuit with hysteresis Output stage Tone frequency generator Switching generator frequency 8 7 6 5 4 3 2 1 Telephone line Rectifier capacitor N.C. Buzzer Output frequency control resistor Sweep rate control capacitor GND Telephone line + - R1 = 2.72 ⋅ 10 4 f1 (Hz) ⋅ (1 − 0.04 ln f1 1943) f2 = 0.725 f1 fSWEEP = 750 C1 (nF) |
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