поискавой системы для электроныых деталей |
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STLC3065QTR датащи(PDF) 10 Page - STMicroelectronics |
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STLC3065QTR датащи(HTML) 10 Page - STMicroelectronics |
10 / 27 page As already mentioned the metering pulse echo cancellation is obtained by means of two external components (RTTX and CTTX) that should match the line impedance at the TTX frequency. This simple network has a double effect: Synthesise a low output impedance at the TIP/RING pins at the TTX frequency. Cut the eventual TTX echo that will be trans- ferred from the line to the TX output. Ringing D0 D1 D2 P1 P2 DET DET1 DET2 1 0 0/1 @fr 1 1 RTrip line 1+2 disable disable 1 0 0/1 @fr 0 1 RTrip line 2 disable disable 1 0 0/1 @fr 1 0 RTrip line 1 disable disable When this mode is selected STLC3065 self gen- erate an higher negative battery (-70V typ.) in or- der to allow a balanced ringing signal of typically 62Vpeak. The SLIC core is set in ring mode via the control inputs D0 and D1 set respectively to 0 and 1. In this condition both the DC and AC feedback loop are disabled and the SLIC core line drivers operate as voltage buffers. The ring waveform is obtained toggling the D2 con- trol bit at the desired ring frequency. This bit in fact controls the line polarity (0=direct; 1=reverse). As in the ACTIVE mode the line voltage transition is performed with a ramp transition, obtaining in this way a trapezoidal balanced ring waveform (see fig.6). The shaping is defined by the CREV external capacitor. Selecting the proper capacitor value it is possible to get different crest fattor values. The following table shows the crest factor values obtained with a 20Hz and 25Hz ring frequency and with 1REN. This value are valid either with European or USA specification: CREV CREST FACTOR @20Hz CREST FACTOR @25Hz 22nF 1.2 1.26 27nF 1.25 1.32 33nF 1.33 Not significant (*) (*)Distorsion already less than 10%. CTTX1 CTTX2 CS RLV RLV SQTTX BURST D0 CKTTX SHAPING GENERATOR Square wave pulse metering Sinusoidal wave pulse metering RTTX FTTX Low Pass Filter - + OP1 CFL R1 R2 C2 C1 Required external components vs. filter order. Figure 5. Metering pulse generation circuit. Order CFL R1 C! R2 C2 THD 1 X 13% 2 X XXX 6% 3 X X XXX 3% GND TIP RING dV/dT set by CREV 2.5V typ. 65V typ. VBAT 2.5V typ. Figure 6. TIP/RING typical ringing waveform STLC3065 10/27 |
Аналогичный номер детали - STLC3065QTR |
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Аналогичное описание - STLC3065QTR |
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