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TEA1065T Folha de dados(PDF) 5 Page - NXP Semiconductors |
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TEA1065T Folha de dados(HTML) 5 Page - NXP Semiconductors |
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5 / 28 page  March 1994 5 Philips Semiconductors Product specification Versatile telephone transmission circuit with dialler interface TEA1065 FUNCTIONAL DESCRIPTION Supply: VCC, LN, SLPE, REG and STAB The circuit and its peripherals are usually supplied from the telephone line. The circuit develops its own supply voltage at VCC (pin 21) and regulates its voltage drop between LN and SLPE (pins 1 and 24). The internal supply requires a decoupling capacitor between VCC and VEE (pin 16); the internal voltage regulator has to be decoupled by a capacitor from REG (pin 22) to VEE. The internal current stabilizer is set by a 3.6 k Ω resistor connected between STAB (pin 9) and VEE. The TEA1065 can be set either in a DC voltage regulator mode or in a DC current regulator mode. The DC mask can be selected by connecting the appropriate external components to the dedicated pins (VSI, REFI, DOC, VBG). When the DC current regulator mode is not required it can be cancelled by connecting pin VSI to VEE; pins REFI, VBG and DOC are left open-circuit. Voltage regulator mode The voltage regulator mode is achieved when the line current is less than the current Iknee as illustrated in Fig.3. With R13 = R14 = 30 k Ω, the current Iknee = 30 mA (Ip = 0 mA). This line current value will be reached when the voltage on pin VSI (almost equal to the voltage on pin SLPE) exceeds the voltage on pin REFI (equal to the voltage on pin VBG divided by the resistor tap R13, R14). For other values of R13 and R14, the Iknee current is given by the following formula: Iknee =ICC + IP + (VBG/R9) × {R14/(R14 + R13)} − (R15/R9) × IO(VSI) ICC is the current required by the circuit itself (typ. 1.14 mA). IP is the current required by the peripheral circuits connected between VCC and VEE. IO(VSI) is the output current from pin VSI (typ. 2.5 µA). The DC slope of the Vline/Iline curve is, in this mode, determined by R9 (R9 = R9a + R9b) in series with the rds of the external line current control transistor (see Fig.4; rds = ∂VGS/∂ID at VGS =VDS). Current regulator mode The current regulator mode is achieved when the line current is greater than Iknee. In this mode, the slope of the Vline/Iline curve is approximately 1300 Ω with R9 = 20 Ω, R16 = 1 M Ω, R13 = R14 = 30 kΩ. For other values of these resistances, the slope value can be approximated by the following formula: R9 × {1 + R16 × (1/R13 + 1/R14)} Fig.3 Voltage and current regulator mode. handbook, full pagewidth MBA567 line current Iknee voltage regulator mode current regulator mode set voltage 0 0 |
Nº de peça semelhante - TEA1065T |
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Descrição semelhante - TEA1065T |
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