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SIL ICON LABORATORIES IMPROVES ANALOG MODEM ROBUSTNESS

Surge immunity is an extremely important attribute for telephony equipment. Unless properly designed to withstand high voltage surges, like those produced by lightning strikes, products such as computer modems can be susceptible to damage. With the introduction of its silicon DAA, Silicon Labs has provided modem designers a cost effective solution that achieves market-leading surge immunity. Silicon Labs’ innovative devices offer a host of advantages over transformer-based modems, including PCB board space savings, cost savings, global compliance, and the integration of additional features.. Additionally, Silicon Labs has been able to achieve a market-leading level of surge immunity using minimal external components. This translates to increased cost savings for modem manufacturers and PC OEMs, as well as increased satisfaction for their customers. Surge Immunity Standards Governmental bodies around the world have created surge immunity standards to ensure that the products sold in those countries can withstand electrical stresses commonly seen in consumer households. Examples of these standards include FCC Part 68 in the United States and the European Standard EN55024. While differing in their scope and specific recommendations, all of these standards share a common goal: to establish practical, economically viable minimum surge immunity standards in order to prevent damage to the telephone network and information technology equipment located on the network. Because these standards are targeted towards minimum thresholds, it is often necessary to exceed the levels of these standards when designing products in order to achieve the desired field performance. For example, the FCC Part 68 standard in the U.S. specifies that electronic products must be able to withstand a specified electrical surge of up to 1500 V [5]. The EN55024 standard is less strict, specifying surge immunity to only 1000 V [6]. It is assumed that if a product is tested to meet these standards that it can be expected to perform well in real world usage. However, experience has shown that for products connected to sources of electrical surges, simply complying with these standards is insufficient to withstand the high levels of surges seen in the real world. The analog modem in a personal computer is one example of a product that is exposed to multiple sources of surges (telephone line and power line surges) and is frequently left connected to these sources indefinitely. When immunity standards tests are performed, they are done using specific surge models in a laboratory setting with well-connected grounds and calibrated test equipment. Unfortunately, the real world is less than ideal and is often not well modeled by laboratory test equipment. Improperly grounded houses and improperly shielded telephone or power lines are prevalent throughout the world. Additionally, certain world regions, including many parts of Asia and the midwestern and southeastern United States, are much more prone to severe lightning strikes than others. Given the variability in conditions around the globe, it is difficult to expect good reliability in all regions of the world after only testing a modem to industry standard minimums in a laboratory setting.