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TEA1098TV Datasheet(PDF) 8 Page - NXP Semiconductors |
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TEA1098TV Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 40 page 1999 Oct 14 8 Philips Semiconductors Product specification Speech and handsfree IC TEA1098 The preferred value for RSLPE is 20 Ω. Changing this value not only affects 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. Figure 4 shows that the internal circuit is supplied by pin VBB, which combined with the line interface is a strong supply point. The line current through resistor RSLPE is sunk by the VBB voltage stabilizer, and is suitable for supplying a loudspeaker amplifier or any peripheral IC. Voltage VBB is 3.0 V at line currents below 18 mA and rises linearly to 5.3 V when the line current rises above 45 mA. It is temperature compensated. The current switch TR1-TR2 is intended to reduce distortion of large AC line signals. Current ISLPE is supplied to VBB via TR1 when the voltage on pin SLPE is above VBB + 0.25 V. When the voltage on pin SLPE is below this value, ISLPE is shunted to GND via TR2. 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 at 2% Total Harmonic Distortion (THD). The external resistor does not affect the voltage on pin VBB; see Fig.5 for the main DC voltages. 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 Fig.4 Line interface principle. |
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