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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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TEA1065T Fiches technique(PDF) 6 Page - NXP Semiconductors |
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TEA1065T Fiches technique(HTML) 6 Page - NXP Semiconductors |
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6 / 28 page  March 1994 6 Philips Semiconductors Product specification Versatile telephone transmission circuit with dialler interface TEA1065 The DC current flowing into the set is determined by the exchange supply voltage (Vexch), the DC resistance of the subscriber line (Rline) and the DC voltage on the subscriber set (see Fig.4). If the line current exceeds ICC + 0.3 mA, required by the circuit itself (ICC ≈ 1.14 mA), plus the current Ip required by the peripheral circuits connected to VCC then the voltage regulator will divert the excess current via LN. VLN =Vref + ISLPE × R9 = Vref + (Iline − ICC − 0.3 × 10−3 − Ip) × R9 where: Vref is an internally generated temperature compensated reference voltage of 4.18 V and R9 is an external resistor connected between SLPE and VEE. The preferred value of R9 is 20 Ω. Changing R9 will influence the microphone gain, gain control characteristics, sidetone and the maximum output swing on LN. In this instance, the voltage on the line (excluding the diode rectifier bridge; see Fig.4) is: Vline =VLN + VGS + R16 × IDOC where: VGS is the voltage drop between the gate and source terminal of the external line current control transistor and IDOC is the current sunk by pin DOC (IDOC = 0 in the voltage regulator mode and increases with Iline in the current regulator mode). Under normal conditions ISLPE >> ICC + 0.3 mA + Ip and for the voltage regulator mode (Iline < Iknee), the static behaviour of the circuit is equal to a 4.18 V voltage regulator diode with an internal resistance of R9 in series with the VGSon of the external line current control transistor. For the current regulator mode (Iline > Iknee), the static behaviour of the circuit is equal to a 4.18 V voltage regulator diode with an internal resistance of R9 in series with the VGSon of the external line current control transistor and also in series with a DC voltage source R16 × IDOC (the preferred value of R16 is 1 MΩ at this value the current IDOC is negligible compared to Iline). In the audio frequency range the dynamic impedance between LN and VEE is equal to R1 (see Fig.8). The internal reference voltage Vref can be adjusted by means of an external resistor RVA. This resistor, connected between LN and REG, will decrease the internal reference voltage. When RVA is connected between REG and SLPE the internal reference voltage will increase. The maximum allowed line current is given in Figs 5 and 6, where the current is shown as a function of the required reference voltage, ambient temperature and applied package. Fig.4 Supply arrangement. handbook, full pagewidth MBA550 SLPE STAB REG VEE Ip LN DOC 121 12 24 16 22 9 TEA1065 AC DC peripheral circuits C1 0.3 mA ISLPE + 0.5 mA Rline R16 Rexch Vexch Iline Vline R1 VCC ICC C3 R5 R9 IDOC |
Numéro de pièce similaire - TEA1065T |
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Description similaire - TEA1065T |
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