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CPC5710N Datasheet(PDF) 7 Page - Clare, Inc. |
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CPC5710N Datasheet(HTML) 7 Page - Clare, Inc. |
7 / 10 page CPC5710N R02 www.clare.com 7 3. Applications 3.1 Line-In-Use (LIU) and Line Polarity Detector This circuit performs two phone line interface functions, LIU and line polarity detection. The LIU output is logic high if the tip to ring voltage is less than approximately 17V. This will occur whenever a parallel device on the line such as a telephone or FAX is taken off hook. This circuit can also be used to detect for the presence or loss of battery. The Polarity output indicates the polarity of the phone line. Whenever tip is positive with respect to ring, Polarity out will be a logic high. Figure 5. LIU and Polarity Detection Application Circuit +V +V U1 CPC5710 LIU Polarity R1-4 8.06M 1% 1206 Ω R5 604K Ω R17 4.7M Ω R15 10K Ω R14 4.7M Ω R16 10K Ω R6 4.7M Ω TIP RING Unless noted otherwise: All resistors 1%, 1/16 W. All capacitors 16 V 10%. Switch shown in Linear Mode IN+ IN- VDD VDD VDD VSS LINOUT+ + + - - - + 1.625 V 1.25 V 2V 0V A=6 V 3 6 7 1 2 5 4 GND 8 GND + - + - VDD 50k Ω R1 R2 R3 R4 R9 499K Ω R13 20K Ω R12 20K Ω R11 499K Ω R8 20K Ω +V 1/4 U2 LM339 IN- IN+ OUT +V 1/4 U2 LM339 IN- IN+ OUT +V 1/4 U2 LM339 IN- IN+ OUT +V R10 21K Ω R7 21K Ω C1 1nF LIN/CMP CMPOUT LINOUT- |
Similar Part No. - CPC5710N_1 |
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Similar Description - CPC5710N_1 |
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