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SFSL6.0MDB Datasheet(PDF) 10 Page - Yamar Electronics Ltd. |
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SFSL6.0MDB Datasheet(HTML) 10 Page - Yamar Electronics Ltd. |
10 / 12 page Proprietary and Confidential Information of YAMAR Electronics Ltd. © 2007 Yamar Electronics Ltd. 10 DS-ISL40 R1.6 4.5 Ceramic Filter The ISL40 is designed to operate with one ceramic filter for transmission and reception. However, if switching between two channels is desired, two ceramic filters are required. The minimum allowable bandwidth of the ceramic filters is +/-70 kHz @ 3dB. Narrower bandwidth limits the maximal bit rate. The ISL40 selectable frequencies are designed according to the market available ceramic filters. Nominal freq. 3 db BW 20db BW Insertion loss Stop band attenuation In/Out imped. Murata part # Oscilent part # MHz KHz min. KHz max. dB max. dB min. Ohm *3.58 +/-40 530 6.0 25 530 SFSH3.58MCB 4.5 +/-70 750 6.0 30 1000 SFSL4.5MDB 773-0045 5.5 +/-80 750 6.0 30 600 SFSL5.5MDB 773-0055 6.0 +/-80 750 6.0 30 470 SFSL6.0MDB 773-0060 6.5 +/-80 800 6.0 30 470 SFSL6.5MDB 773-0065 • The 3.58MHz frequency can be operated with 9.6Kbps and 19.2Kbps only 4.6 Oscillator The ISL40 is designed to operate with a low cost 32.768KHz crystal connected between OscIn and OscOut pins. This type of crystal has the advantage of very low power consumption and low cost. However there are also drawbacks. It is very sensitive to noise and has a temperature dependency that should be carefully considered when selecting the crystal. The following guidelines should be used when designing the PCB: 1. Design the trace length as short as possible. 2. Avoid thin line on resonator traces (< 0.010"), keep them as wide as possible. 3. To avoid noise, protect these signals with Ground shields. The exact values of C1, C2, R1 and R2 should be determined according to the crystal manufacturer. 4.7 Recommended 32.768KHz Crystal Specifications Type Value Nominal Frequency: 32.768KHz Frequency tolerance @25ºC +/-20 ppm Load capacitance 12.5 pF Serial resistance 50K Ohm (max.) Drive level 1uW (max.) Quality factor 50,000 (max.) Turnover temperature +25ºC +/- 5ºC Parabolic constant -0.04 ppm/ºC² (max.) Aging +/-3 ppm in first year (max.) Operating temperature -40ºC to + 85ºC Storage temperature -55ºC to + 125ºC The overall frequency tolerance should not exceed 200ppm. 4.8 Communication performance The maximal cable length between extreme devices depends mainly on the AC impedance of loads connected to that line and number of nodes. The DC cable length has less effect on communication. The SIG40 needs at least 20mVpp for proper reception. Good communication should be achieved if an oscilloscope at the SIG40 receiver can see the transmitted signal within the noise. |
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