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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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CPC5604 Datenblatt(PDF) 18 Page - Clare, Inc. |
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CPC5604 Datenblatt(HTML) 18 Page - Clare, Inc. |
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18 / 33 page  www.clare.com 18 CPC5604 XXX 2 s 500ms 3 s 475ms 1ST RING RING CID 2ND RING SINE WAVE CALLER ID MESSAGE 2 s Figure 3 Caller ID Protocol This CID signal is then processed by the host and, after processing, the host will deactivate the CID signal. At this point the host can answer the call if desired by asserting the OH pin on the LiteLinkTM. It’s important to note that when the LiteLinkTM goes off-hook, it auto- matically disconnects the snoop path from both the RX and Ring outputs. Signals appearing on the telephone line are now coupled through the optical isolation barri- er in the LiteLinkTM and not via the capacitors in the snoop path. CID gain from Tip and Ring to Rx+ and Rx- is deter- mined by: Where f = CID signal frequency For example, with RRXF = 75KW, RSNOOP = 1.4MW, CS = 220pF, and f = 600Hz calculated GAIN = 0.707 or a loss of -3dB at Rx+ and Rx-. This implies that the snoop frequency response is 600Hz. Gain is expressed in decibels by: GAIN = 10 R RXF (R SNOOP) 2 + 1 (2 πf C S) 2 DC characteristics The LiteLinkTM is designed to meet various country DC characteristics including the CTR-21 standard. The pins that control the VI characteristics and current limiting are designated ZDC and DCS. Meeting DC requirements are achieved by selecting the appropriate resistors R ZDC (R16) and R DCS (R20) respectively. Resistor values can also be switched in and out with the CPC5601device or optocouplers which enables international compliance under software control. Suggested resistor values for various countries are listed in table 1. The VI profile on Tip and Ring is described by the following equation: V LINE = VBRIDGE + R DCS+12MΩ (R DCS) 0.5V+ (I LINE - 8mA)RZDC Example: I LINE = 20mA, VBRIDGE = 1.2V, RDCS = 1.69MW, R ZDC = 8W, VLINE = 6.0V. |
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