Datenblatt-Suchmaschine für elektronische Bauteile |
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TEA7063 Datenblatt(PDF) 8 Page - STMicroelectronics |
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TEA7063 Datenblatt(HTML) 8 Page - STMicroelectronics |
8 / 15 page 3. RECEIVE CHAIN 3.1 A.G.C. In Receive As described for the transmission chain, also the receiving gains Gr, from pins 1 and 2 to pin 20, have a reduction of 6dB when Iline moves from ILL to ILS (see also paragr. 4). 3.2 Sidetone Compensation The circuit is provided with a double anti-sidetone network to optimize both at long and short lines. In case double antisidetone network is not re- quested by the application needs, pins 1 and 2 can be connected to each other and 5 external passive components can be saved (ZALL and ZRL). Before entering pins 1 and 2, the received signal is areduced by the two attenating networks: - ZALL/ZRL to pin 1 for long lines sidetone com- pensation, - ZALS/ZRS to pin 2 for short lines sidetone com- pensation. ZRL and ZRS define the total receive gains: a) V20 V16 = Gr • ZRL ZRL + ZALL for long lines b) V20 V16 =( Gr − 6dB ) • ZRS ZRS + ZALS for short lines ZALL and ZALS define the sidetone compensa- tion of the circuit. The equivalent balancing impedance is given by the formula: ZAL = K • ZALS + (1 - K) • ZALL where: -K = 0 at ILINE = ILL or lower (long line) -K varies linearly from 0 to 1 with Iline between ILL and ILS -K = 1 at ILINE = ILS or higher (short line).. Calculations to define ZALL and ZALS are: a) ZALL = 70 • R5 • Zline ( long ) ⁄⁄ Zext ⁄⁄ Zint ⁄⁄ Zout Zout b) ZALL = 70 • R5 • Zline ( short ) ⁄⁄ Zext ⁄⁄ Zint ⁄⁄ Zout Zout where: -Zext = R6//C4//(Zelectret) (at pin 13) -Zint =10K Ω//8.5nF (internal impedance) -Zout = 10.65 • Z4 (at pin 3; see paragr. 2.2) - Zline (short) and (long) are the impedances of the line at minimum and naximum line lenght - R5 = 5.1K Ω ±1% (typically) 3.3 AC Impedance The total AC impedance of the circuit to the line is: ZAC = Zout//Zint//Zext (ZALS, ZALL >>ZAC) 3.4 Receive Mute (and confidence level) When the receive channel is muted (Vpin 14 > 2.7V) the receive gain is reduced of 60dB minimum. Figure 6 TEA7063 8/15 |
Ähnliche Teilenummer - TEA7063 |
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Ähnliche Beschreibung - TEA7063 |
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