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CPC5621A Datasheet(PDF) 11 Page - Clare, Inc. |
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CPC5621A Datasheet(HTML) 11 Page - Clare, Inc. |
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11 / 18 page  CPC5620/CPC5621 Rev. 0.E www.clare.com 11 typical operation. The ring detection threshold can be changed according to the following formula: Clare Application Note AN-117 Customize Caller ID Gain and Ring Detect Voltage Threshold is a spreadsheet for trying different component values in this circuit. Changing the ring detection threshold will also change the caller ID gain and the timing of the polarity reversal detection pulse, if used. 3.2.2 Polarity Reversal Detection with CPC5621 The full-wave ring detector in the CPC5621 makes it possible to detect tip and ring polarity reversal using the RING output. When the polarity of tip and ring reverses, a pulse on RING indicates the event. Your host system must be able to discriminate this single pulse of approximately 1 msec (using the recom- mended snoop circuit external components) from a valid ringing signal. 3.2.3 On-hook Caller ID Signal Reception On-hook caller ID (CID) signals are processed by LITELINK by coupling the CID data burst through the snoop circuit to the LITELINK RX outputs under con- trol of the CID pin. In North America, CID data signals are typically sent between the first and second ringing signal. Figure 5. On-hook Caller ID Signal Timing in North America for CPC5620 (with Half- wave Ring Detect) In North American applications, follow these steps to receive on-hook caller ID data via the LITELINK RX outputs: 1. Detect the first ringing signal outputs on RING. 2. Assert CID low. 3. Process the CID data from the RX outputs. 4. De-assert CID (high or floating). Note: Taking LITELINK off-hook (via the OH pin) dis- connects the snoop path from both the receive outputs and the RING output, regardless of the state of the CID pin. CID gain from tip and ring to RX+ and RX- is deter- mined by: where ƒ is the frequency of the CID data signal. The recommended components in the application cir- cuit yield a gain 0.27 dB at 200 Hz. Clare Application Note AN-117 Customize Caller ID Gain and Ring Detect Voltage Threshold is a spreadsheet for trying different component values in this circuit. Changing the CID gain will also change the ring detection threshold and the timing of the polarity reversal detection pulse, if used. For single-ended snoop circuit output of 0 dBm, set the total resistance across the series resistors (R6/ R44 and R7/R45) to 1.4 M Ω. 3.3 Off-Hook Operation 3.3.1 Receive Signal Path Signals to and from the telephone network appear on the tip and ring connections of the application circuit. Receive signals are extracted from transmit signals by the LITELINK two-wire to four-wire hybrid. Next, the receive signal is converted to infrared light by the receive photodiode amplifier and receive path LED. The intensity of the light is modulated by the receive signal and coupled across the electrical isolation bar- rier by a reflective dome. On the host equipment side of the barrier, the receive signal is converted by a photodiode into a photocur- VRINGPK 750mV R3 ----------------- 2R6 R3 + () 2 1 πfRINGC7 () 2 ------------------------------- + = Caller ID data RING CID First Ring Signal levels not to scale Second Ring 2s 500 ms 3s 475 ms 2s GAINCID dB () 20 6R3 2R6 R3 + () 2 1 πfC7 () 2 ------------------- + ----------------------------------------------------------------- log = |
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