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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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CMT2113AW-ESR 데이터시트(PDF) 15 Page - List of Unclassifed Manufacturers |
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CMT2113AW-ESR 데이터시트(HTML) 15 Page - List of Unclassifed Manufacturers |
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15 / 26 page  CMT2113AW Rev 0.8 | Page 15/26 www.hoperf.com SRMax ≤ 0.5 * ( 1 tRAMP ) In which the PA ramping “rate” is given by (1/tRAMP). In other words, by knowing the maximum symbol rate in the application, the PA ramping time can be calculated by formula below. tRAMP ≤ 0.5 * ( 1 SRMAX ) The user can select one of the values of the tRAMP in the available options that meet the above requirement. If somehow the tRAMP is set to be longer than “0.5 * (1/SRMax)”, it will possibly bring additional challenges to the OOK demodulation of the Rx device. For more detail of calculating tRAMP, please refer to “AN122 CMT2113A Configuration Guideline”. Time Time Logic 1 Logic 0 1024 us 512 us 8 us 4 us 2 us 1 us 0 us Figure 13. PA Ramping Time 5.6 Crystal Oscillator and RCLK The CMT2113AW uses a 1-pin crystal oscillator circuit with the required crystal load capacitance integrated on-chip. Figure 14 shows the configuration of the XTAL circuitry and the crystal model. The recommended specification for the crystal is 26 MHz with ±20 ppm, ESR (Rm) < 60 Ω, load capacitance CLOAD ranging from 12 to 20 pF. To save the external load capacitors, a set of variable load capacitors CL is built inside the CMT2113AW to support the oscillation of the crystal. The value of load capacitors is configurable with the CMOSTEK USB Programmer and RFPDK. To achieve the best performance, the user only needs to input the desired value of the XTAL load capacitance CLOAD of the crystal (can be found in the datasheet of the crystal) to the RFPDK, then finely tune the required XO load capacitance according to the actual XO frequency. Please refer to “AN103 CMT211xA-221xA One-Way RF Link Development Kits Users Guide” for the method of choosing the right value of CL. CMT2113AW XTAL Crystal Model Rm Cm CL C0 Lm CMT2113AW XTAL CL RCLK 26 MHz Cc 0. 3 – 0. 7 Vpp Figure 15. RCLK Circuitry Figure 14. XTAL Circuitry and Crystal Model |
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