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SM8223A датащи(PDF) 11 Page - Nippon Precision Circuits Inc |
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SM8223A датащи(HTML) 11 Page - Nippon Precision Circuits Inc |
11 / 15 page SM8223A NIPPON PRECISION CIRCUITS—11 Input Differential Amplifier The SM8223A uses an input differential amplifier for input gain adjustment of the tip/ring signal input to the FSK detector or DTMF receiver. Differential input configuration and single-ended input configu- ration circuits are shown in figure 3. A bypass capac- itor should be connected between GND and AGND in both circuit configurations. The gain for single-ended configurations is given by the following equation. The gain for differential configurations is given by the following equation, and the input impedance is given by the following equation. FSK/DTMF Auto-discriminator The SM8223A examines the tip/ring input signal and determines the nature of the signal, FSK or DTMF, and invokes the corresponding circuits, FSK decoder or DTMF receiver, respectively. It determines whether the input signal is an FSK signal or DTMF signal by the presence or otherwise of the channel seizure information in the FSK signal header. This function automatically discriminates between the input signals if the FSK signal conforms to the Bellcore GR-30-CORE standard. Figure 3. Input circuits RING R4 C R1 C1 R3 R2 GS AGND TIP R1 C1 Differntial Input RING C R2 GS AGND TIP R1 C1 Single-Ended Input A V R 2 R 1 ------ = A V R 2 R 1 ------ where R 3 R 2R4 R 2 R 4 + ------------------- = = Z i 2 R 1 2 1 ωC 1 ----------- 2 + = |
Аналогичный номер детали - SM8223A |
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Аналогичное описание - SM8223A |
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