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EVB72035-315-FSK-C Datasheet(PDF) 7 Page - Melexis Microelectronic Systems |
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EVB72035-315-FSK-C Datasheet(HTML) 7 Page - Melexis Microelectronic Systems |
7 / 14 page EVB72035 868/915MHz FSK/ASK Transmitter Evaluation Board Description 39012 72035 01 Page 7 of 14 EVB Description Rev. 007 June/07 5 6 4 23 1 12 34 56 RPS CB0 CX2 XTAL CX1 2 3 4 5 1 9 8 76 10 CK PCB loop antenna CM2 CM1 CB1 3 Antenna Board Circuit Diagram Fig. 6: Circuit diagram with loop antenna matching network 3.1 Board Component Values to Fig. 6 Part Size Value @ 868.3 MHz Value @ 915 MHz Toler- ance Description CM1 0603 4.7 pF 3.9 pF ±5% impedance matching capacitor CM2 0603 3.3 pF 3.3 pF ±5% impedance matching capacitor LM1 0603 27 nH 27 nH ±5% impedance matching inductor LM2 0603 12 nH 10 nH ±5% impedance matching inductor CX1_FSK 0805 18 pF 18 pF ±5% XOSC FSK capacitor ( Δf = ±20 kHz), note 1 CX1_ASK 0805 27 pF 27 pF ±5% XOSC ASK capacitor, trimmed to fC, note 1 CX2 0805 10 pF 10 pF ±5% XOSC capacitor ( Δf = ±20 kHz), note 1, only needed for FSK RPS 0603 NIP ±5% power-select resistor, see data sheet section 4.6 CB0 1206 220 nF ±10% de-coupling capacitor CB1 0603 330 pF ±10% de-coupling capacitor 27.13438 MHz 28.59375 MHz XTAL HC49/S ±30ppm cal.; ±30ppm temp. fundamental wave crystal, CL = 12 pF, C0, max = 7 pF, R1 = 40 Ω CK 0805 1 nF ±10% ROI coupling capacitor, only required for external reference frequency input Note 1: depends on crystal parameters, other ∆f values can be selected with other CX1, CX2 values NIP – not in place, may be used optionally |
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