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MC145444P датащи(PDF) 9 Page - Motorola, Inc |
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MC145444P датащи(HTML) 9 Page - Motorola, Inc |
9 / 12 page MC145444 MOTOROLA 9 TRANSMIT SQUELCH The 1–bit serial data (SQ) controls the transmit analog sig- nal. The FSK signal, DTMF tones, single tone, and answer tone are disabled. The external signal to the DSI will be transmitted at that time. The internal line driver works at all times except during the power–down mode. SQ Squelch 1 Enable 0 Disable CHANNEL The transmit and receive channel is set up with a 1–bit se- rial data (CH) when the function mode is either in FSK or analog loopback. When the function mode is either on the FSK or analog loopback mode, the transmit and receive channel is set up with a 1–bit serial data (CH). CH Channel 1 1 (Originate) 0 2 (Answer) CARRIER DETECT TIME The carrier detect time (see Figure 4 and Table 5) is set by 2–bit serial data (CD1, CD0). ton indicates the amount of time the carrier is greater than Von threshold must be present be- fore SD goes low. toff, on the other hand, indicates the amount of delay time SD goes high after the carrier level becomes lower than Voff threshold. Von Voff RxA SD toff ton Figure 4. Carrier Detect Timing Table 5. Carrier Detect Time Truth Table CD1 CD0 Carrier Detect Time (Typ) CD1 CD0 ton (ms) toff (ms) 0 0 450 30 0 1 15 30 1 0 15 15 1 1 80 10 POWER–ON RESET When the power is switched on, this device has the follow- ing conditions. Function Mode FSK Transmit Attenuator 0 dB Transmit Squelch Enable Channel 1 (Originate) |
Аналогичный номер детали - MC145444P |
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Аналогичное описание - MC145444P |
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