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TEA1110AG-D14-T Folha de dados(PDF) 7 Page - Unisonic Technologies |
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TEA1110AG-D14-T Folha de dados(HTML) 7 Page - Unisonic Technologies |
7 / 9 page TEA1110A LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 7 of 9 www.unisonic.com.tw QW-R108-014.D FUNCTIONAL DESCRIPTION(Cont.) 6.0 3.0 5.0 4.0 104 105 106 107 (1) Influence of RVA on VREF (2) VREF without influence of RVA Fig.2 Reference voltage adjustment by RVA (1) (2) RVA (Ω) The internal circuitry of the UTC TEA1110A is supplied from pin VCC which can be used to supply peripheral circuits such as dialling or control circuits. This voltage supply is derived from the line voltage by means of a resistor (RCC) and it must be decoupled by a capacitor CVCC. The VCC voltage depends on the current consumed by the IC and the peripheral circuits as shown by the formula :( RCCint is the internal equivalent resistance of the voltage supply, and Irec is the current consumed by the output stage of the earpiece amplifier)) VCC= VCC0 - RCCint × (IP-IREC) V CC0= VLN-RCC × ICC (see also Figs 3 and 4). The DC line current flowing into the set is determined by the exchange supply voltage (Vexch), the feeding bridge resistance (Rexch), the DC resistance of the telephone line (Rline) and the reference voltage (VREF). The internal reference voltage (generating VREF) would be automatically adjusted to a lower value when the line currents drop below 7.5mA. Therefore, more sets can work in parallel with DC line voltages (excluding the polarity guard) down to 1.6V (absolute minimum voltage). At currents below 7.5mA, the circuit has limited sending and receiving levels. This is called the low voltage area. 2.5 2 0.5 0 01 2 3 4 1.5 1 (1) (2) Vcc (V) (1) With RVA resistor. (2) Without RVA resistorl Vcc VEE Rccint Vcco Irec PERIPHERAL CIRCUIT Ip + Fig.3 Typical current IP available from VCC for peripheral circuits at ILINE=15mA. Fig.4 VCC supply voltage for peripherals |
Nº de peça semelhante - TEA1110AG-D14-T |
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Descrição semelhante - TEA1110AG-D14-T |
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