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TEA1064B Fiches technique(PDF) 6 Page - NXP Semiconductors |
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TEA1064B Fiches technique(HTML) 6 Page - NXP Semiconductors |
6 / 32 page March 1994 6 Philips Semiconductors Product specification Low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting TEA1064B FUNCTIONAL DESCRIPTION Supplies VCC, VEE2, LN, SLPE, REG and STAB (Figs 3 and 5) Power for the TEA1064B and its peripheral circuits is usually obtained from the telephone line. The IC develops its own supply voltage at VCC and regulates its voltage drop. The internal supply requires a decoupling capacitor between VCC and VEE1. The internal current stabilizer is set by a 3.6 k Ω resistor between STAB and VEE1. The DC current flowing into the set is determined by the exchange supply voltage Vexch, the feeding bridge resistance Rexch, the subscriber line DC resistance Rline and the DC voltage (including polarity guard) on the subscriber set (see Fig.3). The internal voltage regulator generates a temperature-compensated reference voltage that is available between LN and SLPE (Vref = VLN-SLPE = 3.23 V typ.). This internal voltage regulator requires decoupling by a capacitor between REG and VEE1 (C3). The configuration shown in Fig.3, gives a stabilized voltage across pins LN and SLPE which, applied via the low-pass filter R16, C15, provides a supply to the peripherals that is independant of the line current and depends only on the peripheral supply current. The value of R16 and the level of the DC voltage VLN-SLPE determine the supply capabilities. In the basic application R16 = 392 Ω and C15 = 220 µF. The worst-case peripheral supply current as a function of supply voltage is shown in Fig.4. To increase the supply capabilities, the value of R16 can be decreased or the DC voltage VLN-SLPE can be increased by using RVA(REG-SLPE). Note The TEA1064B application is the same as is used for TEA1060/TEA1061, TEA1067 and TEA1068 integrated circuits. Fig.3 Supply arrangement with reference to SLPE. The voltage VLN-SLPE is fixed to Vref = 3.323 ±0.25 V. Resistor R16 together with the line current determine the supply capabilities and the maximum output swing on the line (no loop damping is necessary). The line voltage VLN =Vref + ({Iline − 1.55 mA} × R9). handbook, full pagewidth MBA435 Rexch Rline Iline Vexch DC AC 17 REG C3 R5 R9 10 STAB 20 SLPE LN 1 VCC 16 11 VEE1 19 VEE2 0.25 mA R1 ISLPE + 0.25 mA ICC R16 C1 C15 peripheral circuits Vp Ip TEA1064B Ip + 0.25 mA |
Numéro de pièce similaire - TEA1064B |
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Description similaire - TEA1064B |
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