Datenblatt-Suchmaschine für elektronische Bauteile |
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TEA1085AT Datenblatt(PDF) 7 Page - NXP Semiconductors |
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TEA1085AT Datenblatt(HTML) 7 Page - NXP Semiconductors |
7 / 32 page March 1992 7 Philips Semiconductors Preliminary specification Listening-in circuit for line-powered telephone sets TEA1085; TEA1085A Supply; SUP, SREF, VBB, VSS and VA The line current is divided into ITR for the TEA1060 and ISUP for the TEA1085/TEA1085A. The supply arrangement is illustrated in Fig.4. Fig.4 Supply arrangement. handbook, full pagewidth MGR034 TEA1060 VCC LN VEE SLPE TEA1085 TEA1085A VSS VBB Iline ITR SUP C20 ISUP IBBO IBIAS ICC R1 R9 R38 VA R20 VOLTAGE STABILIZER TR1 TR2 SREF Vint LINE ITR is constant: ITR =Vint / R20; ISUP =Iline − ICC − ITR Where: A practical value for R20 is 150 Ω. This value of resistance produces a value for ITR = 2 mA and ISUP = Iline − 3 mA. The TEA1085/TEA1085A stabilizes its own supply voltage at VBB. Transistor TR1 provides the supplies for the internal circuits. TR2 is used to minimize the signal distortion on the line by momentarily diverting the input current to VSS whenever the instantaneous value of the voltage VSUP drops below the supply voltage VBB. VBB is fixed to a typical value of 3.6 V but can be increased by means of an external resistor (R38) connected between Vint is an internal temperature compensated reference voltage with a typical value of 315 mV between SUP and SREF R20 is a resistor between SUP and SREF ICC is the internal current consumption of the TEA106X ( ≈ 1 mA) VA and VSS or decreased by connecting this resistor between VA and VBB. The minimum level on VBB is restricted to 3.0 V; the level of the VBB limiter is also affected (see application report for further information). The supply at VBB is decoupled by a 470 µF capacitor. The DC voltage (VSUP − VSS) is determined by the transmission IC (VLN−SLPE); thus: VSUP − VSS = VLN−SLPE + Vint. The minimum DC voltage that can be applied to this input is VBB(max) + 0.4 V. Where: VBB(max) is the worst case supply voltage (this depends on the setting of R38, which is connected between VA and VSS). The internal current consumption of the TEA1085/TEA1085A (ISUP0) is typically 4.2 mA (where VSUP − VSS = 4.5 V, MUTE off). Thus the current available for powering the loudspeaker is ISUP − ISUP0. The current ISUP0 consists of a bias current of ≈ 0.4 mA for the circuitry connected to SUP and current IBB0 of ≈ 3.8 mA which is used for the circuitry connected to VBB (see Fig.4). |
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