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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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CPC5604ATR датащи(PDF) 19 Page - Clare, Inc. |
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CPC5604ATR датащи(HTML) 19 Page - Clare, Inc. |
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19 / 33 page  CPC5604 www.clare.com 19 XXX Figure 4 On-Hook DC Resistance Tip/Ring Setup LITELINK TM DAA Circuit TIP RING 100VDC + - A On-Hook Resistance Figure 4 shows the test setup for on-hook DC resist- ance. The battery is set to 100VDC and an ammeter is placed in series with the battery connection. When the DAA is in the on-hook state, the leakage current is obtained and then the battery voltage is divided by this current yielding the on-hook resistance. The LiteLinkTM is guaranteed to have a leakage current < 10uA at 100V which is equivalent to an on-hook resistance > 10M Ω thus meeting regulatory approvals. Current Limiting The LiteLinkTM includes a current limiting feature that is selectable via resistor R ZDC (R16). The current limit value is set by the equation: 10 12 For US/Canada/Japan the recommended value for R ZDC (R16) is 8Ω which yields a current limit value of 133mA. The current limiting feature is especially useful in the case where the host system is inadvertently con- nected to a digital PBX telephone port which usually has a very high current limit value. The current limiting capa- bility will prevent damage to the LiteLinkTM in this sce- nario. 1V RZDC 1V RZDC CTR-21 Compliance CTR-21 is the standard for connection of data commu- nications equipment to the European telephone net- work. The maximum current limit requirement in CTR-21 (Section 4.7.1) is 60mA and can be selected by the following equation: ILM = + 8mA Clare recommends current limit be set to 53mA using an R ZDC value of 22Ω. Since VDD is regulated to +3.5V, excess power is dissipated in the external MOSFET package. Since the maximum off-hook line voltage and current in CTR-21 is 40V and 53mA respectively, the maximum power dissipated by the MOSFET is approxi- mately 2.1W. AC Characteristics In a similar manner to the DC characteristics, AC termi- nation impedance is set via R ZNT (R18). For all applica- tions, a 604W resistor for R ZNT (R18) is required to reflect 600W to the CO. |
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