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TEA1111AT Datasheet(PDF) 5 Page - NXP Semiconductors |
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TEA1111AT Datasheet(HTML) 5 Page - NXP Semiconductors |
5 / 24 page 1999 Nov 22 5 Philips Semiconductors Product specification Speech circuit with dialler interface, regulated supply and earpiece volume control TEA1111A This means that several sets can operate in parallel with DC line voltages (excluding the polarity guard) down to an absolute minimum voltage of 1.5 V. At line currents below Ilow, the circuit has limited sending and receiving levels. This is called the low voltage area. THE INTERNAL SUPPLY POINT (PIN VCC) The internal circuitry of the TEA1111A is supplied from pin VCC. This voltage supply is derived from the line voltage by means of a resistor (RCC) and must be decoupled by a capacitor CVCC. It may also be used to supply some external circuits. The VCC voltage (see also Figs 4 and 5) depends on the current consumed by the IC and the peripheral circuits as: VCC0 =VLN − RCC × ICC VCC =VCC0 − RCC × (IP +Irec) Where Irec is the current consumed by the output stage of the earpiece amplifier. handbook, full pagewidth CREG 4.7 µF RSLPE 20 Ω ISLPE FCA053 Iline ILEDC Rline VCC VEE REG SLPE LN LEDC VDD CVCC 100 µF CVDD 220 µF TEA1111A RCC ICC ILN IP IDD ISUP REXCH VEXCH peripherals external circuits from preamplifier VDD REGULATOR internal circuitry LED CONTROL LED CIRCUIT Fig.3 Supply configuration. |
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