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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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CPC5604ATR датащи(PDF) 15 Page - Clare, Inc. |
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CPC5604ATR датащи(HTML) 15 Page - Clare, Inc. |
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15 / 33 page  CPC5604 www.clare.com 15 XXX Introduction The LITELINKTM (CPC5604) is a single package International Data Access Arrangement solution that is designed to be used in a variety of telephone applica- tions including high performance 56kbps (V.90) modems. The LITELINKTM uses advanced optical signal coupling techniques to provide the required electrical isolation between the telephone and the Customer Premises Equipment (CPE). The LITELINKTM differs from other solutions using optical or capacitive isolation techniques by including the barrier inside the IC pack- age, thus eliminating the need for external optocouplers or high-voltage capacitors in the data path resulting in overall reduced board space. The LITELINKTM has been designed to meet or exceed the requirements of international regulatory agencies. For international PTT compliance external passive com- ponents can be changed to meet different country requirements. For added flexibility, a second device, the CPC5601, can be used in conjunction with the CPC5604 to offer a host programmable solution. The CPC5601 is pro- grammed serially through the host’s microcontroller. Using the CPC5601 along with the CPC5604 eliminates the need to change external passive components allow- ing for a flexible, fully international DAA. Ring Detection via Snoop Circuit While in the on-hook state (OH deasserted), an internal multiplexer turns on a “snoop” circuit that actively moni- tors the phone line for two conditions: incoming ring sig- nal and Caller ID (CID) information. The snoop circuit “snoops” the line continuously while drawing a low 2uA max. current from the telephone line thus meeting regu- latory requirements. When the central office (CO) places a ring signal on the telephone line, 90V RMS max, the RING output is pulsed from High to Low for 2 seconds at the same frequency as the AC signal, typically 20Hz, and restored to High during the 4 second delay. The ring detection circuitry is designed to reject false signaling from pulse dialing circuits or noise on the line. Caller ID (CID) Detection via Snoop Circuit CID is a service offered by the telephone company to provide caller information (i.e. the caller’s telephone number) to the called party. The CID signal is present on the telephone line after the first ring burst is sent from the CO. After this first ring burst is detected by the host, the host asserts the CID line which automatically cou- ples the snoop circuit to the RX outputs on the LITELINKTM. After the CID signal is processed by the host, the host will deactivate the CID signal. At this point the host can answer the call by asserting the OH signal. Note that when the LITELINKTM goes off-hook it auto- matically disconnects the snoop path from both RX and RING outputs. Signals appearing on the telephone line are now coupled through the optical isolation barrier in the LITELINKTM and not via the snoop path. Hook Switch Control The OH or off-hook input is used to place the DAA on or off-hook. When the input is High, the DAA is on-hook or ready to receive calls from the CO. In this mode the snoop circuitry is enabled as described above. Driving OH Low places the DAA off-hook allowing the CO sup- plied loop current to flow (120mA max.), indicating the DAA is answering or preparing to place a call. Transmit Signal Outgoing analog signals to be transmitted to the tele- phone lines are placed differentially on the TX+ and TX- inputs of the CPC5604. Transmit level from the user device is limited to 0dBm or 2.1Vp-p. The differential transmit signal is converted to a single ended signal by the CPC5604. The transmit signal is transferred across an optical barrier by an electrical-optical-electrical amplifier, which is transparent to the user. Variations in gain due to electrical-optical-electrical efficiency are vir- tually eliminated by an on-chip automatic gain control circuit which sets the input to output gain of the photo- diode amplifier to 1. This results in a TX insertion loss of +/- 1dB. |
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