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L6726L-S18-T Datasheet(PDF) 9 Page - Unisonic Technologies |
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L6726L-S18-T Datasheet(HTML) 9 Page - Unisonic Technologies |
9 / 13 page L6726 LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 9 of 13 www.unisonic.com.tw QW-R108-015, C APPLICATION INFORMATION(Cont.) R15: This resistor is used to set the driving capability of the receiver output amplifier. Common values are 0 Ω to 50 Ω. Setting it for low driving capability results in function at lower line current. Breaking up pin 16 will give lower power consumption and total mute of the receiver when muting the circuit. Disconnecting pin 15 will of cause also give total receiver mute. D1, D2, D3, D4, D5: Rectifier bridge and over voltage protector. The zener voltage at D5 should be as low as possible. Common values are between 12V~16V. RDC1, RDC2: Refer to fig. 5 The pre-set output voltage of 2.35V can easily, if needed, be changed to another value by applying one or two resistor(RDC1,RDC2) in parallel with the internal resistors (each 15kΩ+/-20%).It is possible to get a rather high voltage and current from the DC-supply as long as the high current and voltage is available from the line. The DC voltage has to be filtered by a capacitor and this can, at high DC-voltage and low line current, interfere with the signal on the line and cause distortion. You can minimize the interference, with a resistor in series with the filter capacitor. The DC voltage will, of course, be more dependent of the DC-supply current. The DC-output pin has a very low input leak current, to allow stand-by feeding of the dialer. It is also possible to use pin 9 to feed microphones etc. that do not need stand-by feeding, without interfering with the stand-by feeding on pin 8. Note that a high current consumption by the external device will alter the DC characteristics of the speech circuit |
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