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N682386MG Datasheet(PDF) 25 Page - Nuvoton Technology Corporation |
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N682386MG Datasheet(HTML) 25 Page - Nuvoton Technology Corporation |
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25 / 160 page  N682386/87 + N681622 Dual Programmable Extended Codec/SLCC + SLFC Revision 1.3 Page 25 of 160 Sep 2010 12.1. BORSCHT FUNCTIONALITY The N682386/87 connects to the TIP and RING (POTS - Plain Old Telephone Service) interface and performs the so- called BORSCHT and AC transmission functions. Following are the BORSCHT functions: B attery Feed O ver-Voltage Protection R inging (Balanced / Unbalanced) S upervision (Signaling) C oding H ybrid (2 / 4-wire conversion) T esting 12.1.1. BATTERY FEED The N682386/87, has two DC feed regions; a constant voltage region and a constant current region. As illustrated in Figure 4 the current limit ILIM determines the constant current region. The ON-HOOK voltage, VOH, determines the constant voltage region. The device has an inherent output resistance of typically 50Ω in non-ringing states. The Ground Margin Voltage, VGM, determines the offset of the most positive terminal (TIP in Forward polarity state and RING in Reverse polarity state) with respect to ground ILIM, VOH, and VGM are programmable as shown in Table 2. Figure 5: DC Feed Regions Register Address Parameter Programmable Range Step Size Default Value Unit LCL 0x45 ILIM 20 – 41 3 20 mA OHV 0x4C VOH 0 to –93.5 1.484 -47.488 V GMV 0x4D VGM 0 to –93.5 1.484 -2.968 V Table 3: Programmable Ranges for DC Line Feed DCFeed |VTIP-VRING| (Volt) ILOOP (mA) VOH ILIM ΔV ΔI =50Ω typical ΔV ΔI >10kΩ typical DCFeed |VTIP-VRING| (Volt) ILOOP (mA) VOH ILIM ΔV ΔI =50Ω typical ΔV ΔI >10kΩ typical |
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