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TEA7063 bảng dữ liệu(PDF) 6 Page - STMicroelectronics |
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TEA7063 bảng dữ liệu(HTML) 6 Page - STMicroelectronics |
6 / 15 page 2. TRANSMISSION CHAIN 2.1 A.G.C. In Transmission The transmission gain between Microphone Input (pin 7) and Vline (pin 16) is internally decreased of 6dB when the line current varies from ILL to ILS with a constant AC load of 600 Ω. The values of ILL (long line current) and ILS (short line current) are programmable through I-start (pin 9) and I-slope (pin 15) (see also paragr. 4). 2.2 Sending Impedance The impedance of the Output Stage Amplifier, Zout, is determined by the impedance Z4 (at pin 3). Zout = 10.65 xZ4 The total AC impedance shown to the line is the parallel Zpar =Zout//Zint//Zext where: -Zint = 10K Ω//8.5 nF (internal) -Zext = R6//C4 (at pin 16) 2.3 Sending Mute In normal speech operation (Vmute at pin 14 < 0.8V), the signal at Microphone Input (pin 7) is amplified to Vline (pin 16) with the gain Gs (long line) or 6dB lower (shorter lines) depending on AGC control (see paragr. 4). In sending mute condition (V 14 > 1.6V) these gains are reduced of at least 60dB. In the same condition, DTMF input (pin 6) is activated, with gain Gmf to the line independent from Iline lenght. 2.4 Antisidetone Buffer The signal coming from the sending preamplifier is internally presented at pin 4 and than buffered to pins 1 and 2 for sidetone cancellation (see paragraph 3.2). Figure 3 TEA7063 6/15 |
Số phần tương tự - TEA7063 |
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Mô tả tương tự - TEA7063 |
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