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STLC30R81 bảng dữ liệu(PDF) 7 Page - STMicroelectronics |
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STLC30R81 bảng dữ liệu(HTML) 7 Page - STMicroelectronics |
7 / 17 page 7/17 STLC30R81 – Selecting Rxin+/Rxin- (first path), the sinusoidal waveform can be applied in differential mode (using both inputs) or single ended mode (connecting one of the two input pins directly to the GND). This signal comes from STLC5048 or other Codec – Selecting Rg+/Rg- (second path), the sinusoidal (or PWM) waveform ringing, can be applied in differ- ential mode (using both inputs) or single ended mode (connecting one of the two input pins directly to the GND). The ring source (codec, waveform generators) can be always active and shared by multiple lines. Both DC/AC feedback loops are disabled except for the first path (Rxin+/Rxin-) that remains enabled. This func- tionality will be managed through an "Input Word" that allows the ringing signal, to flow through the line. The Table 3 shows how to select the proper input word. Table 3. Control Word Figure 5. Ringing internal block In On-Hook condition, Tip and Ring are biased at -VBAT2/2; the input signal is typically amplified at 35dB. Ring trip detection is performed sensing the variation of the AC line impedance from High (On-Hook) to Low (Off-Hook). This particular ring trip method, allows to operate without DC offset superimposed on the ring signal and therefore, obtain the maximum possible load driving capability, from a given negative battery. After Ring/ Trip detection, DET pin is set Low and remains latched keeping the STLC30R81 in Stand-by mode until the op- erative mode is modified by Input Word. PWM Ringing Waveform A pulse-width modulated (PWM) signal may be used to provide the ringing input to Rg inputs. The signal is ap- plied through a low-pass filter and AC-coupled into Rg+. This approach gives a sine wave output at tip and ring- ing circuit. Control Word Input Selected Mode D0 D1 D2 D3 1 0 0 1 Rxin+/ Rxin- Input selected 1 0 1 1 Rg+/Rg- Input selected Logic interface Rxin+ Rxin- Rg+ Rg- D0 D1 D2 D3 DET OpAmp 1 OpAmp 2 Internal switch Ring Gain Ring Trip + - Ring Det |
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Mô tả tương tự - STLC30R81 |
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