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TEA1098ATV Datasheet(PDF) 7 Page - NXP Semiconductors |
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TEA1098ATV Datasheet(HTML) 7 Page - NXP Semiconductors |
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7 / 40 page  2000 Mar 21 7 Philips Semiconductors Preliminary specification Speech and handsfree IC TEA1098A handbook, full pagewidth 1 2 3 4 5 6 7 8 9 10 11 33 32 31 30 29 28 27 26 25 24 23 TEA1098AH FCA142 EARO DTMF MIC + MIC − TXI GATX TXO IDT SWT n.c. HFRX TNOI TENV TSEN RNOI RSEN DLC n.c. GALS GNDTX RENV VBB Fig.3 Pin configuration (TEA1098AH). FUNCTIONAL DESCRIPTION All data given in this chapter are typical values, except when otherwise specified. Supplies LINE INTERFACE AND INTERNAL SUPPLY (PINS LN, SLPE, REG AND VBB) The supply for the TEA1098A and its peripherals is obtained from the line. The IC generates a stabilized reference voltage (Vref) between pins SLPE and GND. This reference voltage is equal to 3.7 V for line currents lower than 18 mA. It than increases linearly with the line current and reaches the value of 6.1 V for line currents higher than 45 mA. For line currents below 9 mA, the internal reference voltage generating Vref is automatically adjusted to a lower value. This is the so-called low voltage area and the TEA1098A has limited performances in this area (see Section “Low voltage behaviour”). This reference voltage is temperature compensated. The voltage between pins SLPE and REG is used by the internal regulator to generate the stabilized reference voltage and is decoupled by means of a capacitor between pins LN and REG. This capacitor converted into an equivalent inductance realizes the set impedance conversion from its DC value (RSLPE) to its AC value (done by an external impedance). The IC regulates the line voltage at pin LN and can be calculated as follows: where: Iline = line current Ix = current consumed on pin LN (approximately a few µA) ISLPE = current flowing through the RSLPE resistor 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. V LN V ref R SLPE I × + SLPE = I SLPE I line I x – = |
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