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TEA1064AT Datasheet(PDF) 6 Page - NXP Semiconductors |
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TEA1064AT Datasheet(HTML) 6 Page - NXP Semiconductors |
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6 / 36 page  March 1994 6 Philips Semiconductors Product specification Low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting TEA1064A FUNCTIONAL DESCRIPTION Supplies VCC1, VCC2, LN, SLPE, REG and STAB (Fig.3) Power for the TEA1064A and its peripheral circuits is usually obtained from the telephone line. The IC develops its own supply voltage at VCC1 and regulates its voltage drop. The internal supply requires a decoupling capacitor between VCC1 and VEE. The internal current stabilizer is set by a 3.6 k Ω resistor between STAB and VEE. 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 VCC2 and SLPE [Vref =VCC2-SLPE = 3.3 V (typ.)]. This internal voltage regulator requires decoupling by a capacitor between REG and VEE (C3). The reference voltage can be used to: • regulate directly the line voltage (stabilized VLN-SLPE =VCC2-SLPE)(1) • to stabilize the supply voltage for peripherals. Regulated line voltage In this application the VCC2 pin is connected to the LN pin as shown in Fig.3. This configuration 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 independent 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 DC voltage VLN-SLPE can be increased by using RVA(REG-SLPE) or by decreasing the value of R16. (1) The TEA1064A application with regulated line voltage is the same as is used for TEA1060/TEA1061, TEA1067 and TEA1068 integrated circuits. Fig.3 Application with regulated line voltage (stabilized VLN-SLPE). The voltage VLN-SLPE is fixed to Vref = 3.3 ± 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 MGR058 Rexch Rline Iline Vexch DC AC 17 REG C3 R5 R9 10 STAB 20 SLPE LN 1 VCC1 16 19 VCC2 11 VEE 0.25 mA R1 ISLPE ICC1 R16 C1 C15 peripheral circuits Vp Ip TEA1064A Ip + 0.25 mA |
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