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CPC5710NTR Datasheet(PDF) 6 Page - Clare, Inc. |
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CPC5710NTR Datasheet(HTML) 6 Page - Clare, Inc. |
6 / 9 page CPC5710N 6 www.clare.com Rev. 1.0 12/16/2002 2.2 Non-Intrusive Line Monitoring, Display Feature (Caller ID) Signal Reception, and Ring Detection Application This application uses the logic input LIN/CMP to select between detecting ringing or passing through display feature (caller-ID) and voice signals. Note the AC coupling of the tip and ring signals. With this circuit, set LIN/CMP high to detect ringing. After a valid ring, set LIN/CMP low to couple the audio channel signal to the output pins. Please see “Comparator Considerations” on page 7 for more information on ringing detection. Figure 4. Non-Intrusive Line Monitoring, Display Feature (Caller ID) Signal Reception, and Ring Detection Application Circuit 2.2.1 Frequency Response The blocking capacitors used in this application circuit affect the frequency response of the system. With the components shown, response rolls off 3 dB @ 166 Hz. Other values can be used for different response characteristics. 2.3 Regulatory Issues Component sizing and value recommendations shown in the application circuits above will need to be reviewed with regard to the regulatory requirements of any particular application. IN+ IN- LIN/CMP VDD VDD VDD VSS VSS VSS CMPOUT RING DETECT (to ring parser) LINOUT+ Display Feature Output V = V at 500 Hz OUT IN 3.3 or 5 V LINOUT- A + + - - - + 1.625 V 1.25 V A=6 V U1 CPC5710 R1-4 1.8 M (R ) SNP C1,2 220 pF (C ) SNP R5 (R ) 1.5 M, 1% 0603 SNPD TIP RING From Control Logic 2V 0V Unless noted otherwise: 1/8 W, All resistors are 1%, 1206. All capacitors are 2 kV, 10%. |
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