поискавой системы для электроныых деталей |
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SA2532K датащи(PDF) 9 Page - Sames |
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SA2532K датащи(HTML) 9 Page - Sames |
9 / 27 page AN1500A sames sames sames sames 9/27 To accommodate easy and uncomplicated redialing behind a PABX, a sliding cursor protocol is implemented: if a manually entered digit string matches the contents of the LNR memory, pressing LNR will only dial out the remaining digits : example: desired number 0123456 (where 01 is the access code) off-hook, manual entry = 01 -wait for dial tone -23456 - line is busy -on-hook (LNR contents is 0123456) off-hook, manual entry = 01 -wait for dial tone - press LNR key: LNR dials out the remaining digits: 23456 The SA2532K is designed for applications requiring a characteristic impedance of 600 Ohms, no connection should be made to CI (pin 7) if a real impedance is required. Should a complex impedance be required a capacitor of approximately 1/10 of the complex part of the impedance should be connected to CI. Every complex impedance consists of a real and complex part. The ac impedance of the SA2532K is calculated by ZAC = ZSYN + Z1 Where : Z1 = the external resistor connected between pin 1(LS) and pin 27 (LI) . This resistor is also used by the device for current monitoring and sets the DC resistance. To maintain correct operation the value of this resistor should be set to 30 Ohm. ZSYN = the internally synthezised impedance. For real impedances ZSYN = 19 * Z1 ZAC = (19*ZSYN) + Z1 ZAC = 20 * Z1 = 600 Ohm If a impedance lower than ZAC is required, then a external parallel impedance should be added between LS and VSS. To calculate the resulting AC impedance, any parallel impedance path between LS and VSS should be considered. For example, if a bipolar line transistor is used, the resistance from the transistors base to VSS (ZP) is in the order of 10K (R10). If a MOSFET is used then ZP is in the order of 100K which is negligible. ZAC = 600//ZP Care must be taken when selecting the value of ZP since the value chosen should be such that the line transistor is driven into full saturation. 11.1 Demo board measurements: 11.1.1 Definition: return loss is defined as: returnloss Zref Zx Zref Zx = + − 20*log where: Zref = the reference AC impedance (= the line termination) Zx = the AC impedance of the telephone under test 10 Sliding cursor protocol and pause insertion 11 AC impedance of the SA2532K |
Аналогичный номер детали - SA2532K |
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Аналогичное описание - SA2532K |
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