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TEA1114AT Datasheet(PDF) 7 Page - NXP Semiconductors |
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TEA1114AT Datasheet(HTML) 7 Page - NXP Semiconductors |
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7 / 28 page  2000 Mar 21 7 Philips Semiconductors Product specification Low voltage telephone transmission circuit with dialler interface and regulated strong supply TEA1114A THE INTERNAL SUPPLY POINT (PIN VCC) The internal circuitry of the TEA1114A 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 depends on the current consumed by the IC and the peripheral circuits as: (see also Figs 4 and 5). Irec is the current consumed by the output stage of the earpiece amplifier. V CC0 V LN R CC I CC × – = V CC V CC0 R CC I P I rec + () × – = handbook, halfpage MGK806 Irec EXTERNAL CIRCUITS IP VEE VCC VCC0 RCC Fig.4 VCC used as supply voltage for external circuits. handbook, halfpage 0 3 2 1 0 12 4 3 MGL827 IP (mA) VCC (V) (2) (1) 1.9 mA 1.6 mA Fig.5 Typical current IP available from VCC for peripheral circuitry. VCC ≥ 2.5 V; VLN = 4.35 V at Iline = 15 mA; RCC = 619 Ω; RSLPE =20 Ω. Curve (1) is valid when the receiving amplifier is driven: VQR(rms) = 150 mV; RL1 = 150 Ω. Curve (2) is valid when the receiving amplifier is not driven. THE REGULATED SUPPLY POINT (PIN VDD) The VDD regulator delivers a stabilized voltage for the peripherals in transmission mode (nominal VLN) as well as in ringer mode (VLN = 0 V). The regulator (see Fig.6) consists of a sense input circuit, a current switch and a VDD output stabilizer. The regulator operates as a current source at the LN input in transmission mode; it takes a constant current of 4.3 mA (at nominal conditions) from pin LN. The current switch reduces the distortion on the line at large signal swings. Output VDD follows the DC voltage at pin LN (with typically 0.35 V difference) up to VDD = 3.3 V. The input current of the regulator is constant while the output (source) current is determined by the consumption of the peripherals. The difference between input and output current is shunted by the internal VDD stabilizer. In ringer mode, the stabilizer operates as a shunt stabilizer to keep VDD at 3.3 V. In this mode, the input voltage VLN = 0 V while the input current into pin VDD is delivered by the ringing signal. VDD has to be decoupled by a capacitor CVDD. |
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