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TEA1097 Datasheet(PDF) 8 Page - NXP Semiconductors |
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TEA1097 Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 36 page 1999 Apr 08 8 Philips Semiconductors Product specification Speech and loudspeaker amplifier IC with auxiliary inputs/outputs and analog multiplexer TEA1097 The preferred value for RSLPE is 20 Ω. Changing this value will affect more than the DC characteristics; it also influences the transmit gains to the line, the gain control characteristic, the sidetone level and the maximum output swing on the line. As can be seen from Fig.4, the internal circuitry is supplied by pin VBB, which is a strong supply point combined with the line interface. The line current is flowing through the RSLPE resistor and is sunk by the VBB voltage stabilizer, becoming available for a loudspeaker amplifier or any peripheral IC. Its voltage is equal to 3.0 V for line currents lower than 18 mA. It than increases linearly with the line current and reaches the value of 5.3 V for line currents greater than 45 mA. It is temperature compensated. The aim of the current switch TR1 and TR2 is to reduce distortion of large AC line signals. Current ISLPE is supplied to VBB via TR1 when the voltage on SLPE is greater than VBB + 0.25 V. When the voltage on SLPE is lower than this value, the current ISLPE is shunted to GND via TR2. The reference voltage Vref can be increased by connecting an external resistor between pins REG and SLPE. For large line currents, this increase can slightly affect some dynamic performances such as maximum signal level on the line for 2% THD. The voltage on pin VBB is not affected by this external resistor. See Fig.5 for the main DC voltages. Fig.4 Line interface principle. handbook, full pagewidth MGM298 TN2 TR2 TR1 E2 D1 D1 R3 R2 R1 TN1 TP1 J2 J1 E1 GND GND VBB from preamp GND REG LN SLPE CREG 4.7 µF RSLPE 20 Ω |
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