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CR0603-16W-104J Datasheet(PDF) 11 Page - Silicon Laboratories |
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CR0603-16W-104J Datasheet(HTML) 11 Page - Silicon Laboratories |
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11 / 36 page  Si2493/57/34/15/04 Global ISOmodem-EVB Rev. 0.7 11 2.2. Modem Daughter Card Operation The Si2493/57/34/15/04URT-EVB daughter card is a complete modem solution perfectly suited for use in an embedded system. The daughtercard contains both the modem system-side chip and the isolated line interface (DAA). The daughter card requires a 3.3 V supply capable of providing at least 35 mA and communicates with the system via LVCMOS/TTL-compatible digital signals on JP1. The RJ-11 jack (TIP and RING) is connected via JP2. Be sure to provide the proper power-on reset pulse to the daughter card if it is used in the stand-alone mode. 2.2.1. Reset Requirements The Si2493/57/34/15/04 ISOmodem® daughter card must be properly reset at powerup. The reset pin (pin 8) of the Si2493/57/34/15/04 (JP103, J101 pin 13) must be held low for at least 5.0 ms after power is applied and stabilized to ensure the device is properly reset. 2.2.2. Crystal Requirements Clock accuracy and stability are important in modem applications. To ensure reliable communication between modems, the clock must remain within ±100 ppm of the design value over the life of the modem. The crystal selected for use in a modem application must have a frequency tolerance of less than ±100 ppm for the combination of initial frequency tolerance, drift over the normal operating temperature range, and five year aging. Other considerations, such as production variations in PC board capacitance and the tolerance of loading capacitors, must also be taken into account. 2.2.3. Protection The Si2493/57/34/15/04-EVB meets or exceeds all FCC and international PTT requirements and recommendations for high-voltage surge and isolation testing without any modification. The protection/isolation circuitry includes C1, C2, C8, C9, FB1, FB2, and RV1. The PCB layout is also a key “component” in the protection circuitry. The Si2493/57/34/15/04-EVB provides isolation to 3 kV. Contact Silicon Laboratories for information about designing to higher levels of isolation. |
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