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CPC5710NTR Datasheet(PDF) 5 Page - Clare, Inc. |
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CPC5710NTR Datasheet(HTML) 5 Page - Clare, Inc. |
5 / 10 page CPC5710N R02 www.clare.com 5 2. Using CPC5710N 2.1 LIN/CMP Input The LIN/CMP input selects the active output, either the detector output CMPOUT or the linear outputs, LINOUT- and LINOUT+. Set LIN/CMP low for linear output and high for comparator output. Note that both outputs cannot be used at once. With LIN/CMP at logic low (LIN/CMP = 0), the amplifier outputs are biased at a nominal 1VDC and CMPOUT is held high. With LIN/CMP at logic high (LIN/CMP = 1), LINOUT+ is 0V and LINOUT- is 2V. Figure 2. LIN/CMP Timing for Caller-ID Signal Reception 2.2 Amplifier Design Considerations Amplifier inputs are biased at a nominal 1.25VDC, the internal voltage reference. The internal common-mode circuitry maintains the average of the inputs at 1.25VDC. For example, if one input reaches 1.3V, the common-mode circuit drives the other input to 1.2V. 2.2.1 Linear Amplifier Gain Display feature information (caller ID) and voice signals are coupled through the linear amplifier. In North America, CID data signals are typically sent between the first and second ringing signal burst. Referring to Figure 6., signal gain from tip and ring to LINOUT+ and LINOUT- is determined by: where ƒ is the frequency of the signal. Clare Application Note AN-117 Customize Caller ID Gain and Ringing Detect Voltage Threshold is a spreadsheet for trying different component values in this type of circuit. 2.3 Detector Considerations 2.3.1 Ringing Signal Detection The CPC5710N detector is a full-wave configuration. Ringing signals will assert the output on both positive and negative parts of the ringing waveform. Hysteresis is employed by the internal comparator circuit to provide noise immunity. The set-up of the detector causes CMPOUT output pulses to remain low for most of the ringing signal positive and negative half-cycles. CMPOUT returns high when the ringing signal is near the zero-voltage crossing. Figure 3. CMPOUT Relative to Input 2.3.2 Setting Ringing Detection Threshold The ringing detection threshold depends on the component values of the input network. The values for these components shown in the application circuit are recommended for typical operation. Referring to Figure 6., the ringing detection threshold can be changed according to the following formula: Caller ID data LIN/CMP Signal levels not to scale 2s 500 ms 3s 475 ms 2s GAINCID dB () 20 6RSNPD 4RSNP RSNPD + () 2 1 πfCSNP () 2 -------------------------- + ----------------------------------------------------------------------------------------- log = CMPOUT Ringing Signal VRINGPK 750mV RRSNPD ------------------- 4RSNP RSNPD + () 2 1 πfRINGCSNP () 2 -------------------------------------- + = |
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