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PEB4065 Datasheet(PDF) 6 Page - Siemens Semiconductor Group |
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PEB4065 Datasheet(HTML) 6 Page - Siemens Semiconductor Group |
6 / 29 page PEB/F 4065 Overview Semiconductor Group 6 1998-03-01 Controlled by C2, the polarity of V ab can be reversed and the DC-line-voltage then is V abDC =– (VBAT – VHINT + Vfix –40 × V2WDC). The transversal and longitudinal currents are measured in the buffers and scaled images are provided at the I T and IL pin, respectively: I T =(Ia + Ib)/100 = Iab/50 I L =– (Ia – Ib)/100 = – ILong/50. The PEB 4065 operates in four modes controlled by ternary logic signals at the C1 and C2 input. Additionally, in the active modes a polarity reversal of the output voltage can be programmed (see Table 1). Power down (PD): Power consumption is reduced by decreasing bias current levels. All functions operate at some small performance reductions. In this mode each of the line outputs can be programmed to show high impedance. HI b switches off the TIP buffer, while the current through the RING output still can be measured by I T or IL. Programming HI a reverses the polarity and switches off the RING buffer. Conversation (CONV): This is the regular transmit and receive mode for voiceband and teletax. The line driving section is operated between V BAT and BGND. Boosted battery (BB): In order to drive longer telephone lines an auxiliary positive battery voltage V H is used, enabling a higher DC-voltage across the line. Ringing (RING): This mode also uses the auxiliary voltage V H in order to provide a balanced ring signal of up to 85 Vrms. The ring tone without any DC-component has to be switched to the V 2W input. Internally a DC-voltage is superimposed. This voltage is proportional to the total supply voltage V H – VBAT and amounts to typically 23 V at V H – VBAT = 120 V. The current sensing functions are available for ring trip detection. The Power Denial (PDN) state is intended to reduce power consumption of the linecard to a minimum: the PEB 4065 is switched off completely by connecting the PDN pin to V DD, no operation is available. With respect to the output impedance of TIP and RING two PDN-modes have to be distinguished. A resistive one (PDNR) provides a connection of 15 k Ω each from TIP to BGND and RING to V BAT, respectively, while the outputs of the buffers show high impedance (Figure 3). The other mode (PDNH) offers high impedance at TIP and RING. It is entered when, in addition to connecting PDN to V DD, the programming inputs C1, C2 are tied to VIL. All other combinations of C1, C2 yield the resistive power denial state PDNR. |
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