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TEA1069H Scheda tecnica(PDF) 7 Page - NXP Semiconductors |
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TEA1069H Scheda tecnica(HTML) 7 Page - NXP Semiconductors |
7 / 44 page 1998 Jan 08 7 Philips Semiconductors Product specification Versatile speech/dialler/ringer with music-on-hold TEA1069; TEA1069A Fig.3 Pin configuration (SOT307-2). handbook, full pagewidth TEA1069H TEA1069AH MBH784 1 2 3 4 5 6 7 8 9 10 11 33 32 31 30 29 28 27 26 25 24 23 DTMF KT/EARTH CSI XTAL1 XTAL2 RESET CE/FDI COL6 COL5 COL4 VEE MUTE DIODE VCC REG ROW3 ROW2 ROW4 ROW5 VEE HF ROW1 FUNCTIONAL DESCRIPTION Speech part For numbering of components refer to Figs 28 and 29. SUPPLIES VCC, LN, SLPE, REG AND STAB Power for the IC and its peripheral circuits is usually obtained from the telephone line (see Fig.4). The circuit creates a stabilized voltage (Vref = 3.7 V) between LN and SLPE. This reference voltage is temperature compensated and can be adjusted by means of an external resistor RVA. It can be increased by connecting an RVA resistor (R60) between REG and SLPE or decreased by connecting an RVA resistor (R61) between REG and LN. This internal voltage reference is decoupled by capacitor C3 between REG and VEE. This decoupling capacitor realises the set impedance conversion from its DC value to its AC value in the audio frequency range. The internal transmission part of the circuitry (including the earpiece amplifier) is supplied from VCC. This voltage supply is derived from the LN voltage via a dropping resistor (R1) and must be decoupled by a capacitor (C1) between VCC and VEE. This supply point may also be used to supply the dialler/ringer (VDD) part or external circuit e.g. electret microphone. The DC current flowing into the set is determined by the exchange supply voltage Vexch, the feeding bridge resistance Rexch and the DC resistance of the telephone line Rline. When the line current (Iline) is more than 0.5 mA greater than the sum of the IC supply current (ICC) and the current drawn by the peripheral circuitry connected to VCC (Ip), the excess current is shunted to SLPE via LN. |
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