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TH7108 数据表(PDF) 9 Page - Melexis Microelectronic Systems |
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TH7108 数据表(HTML) 9 Page - Melexis Microelectronic Systems |
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9 / 14 page  TH7108 868/915MHz FSK/FM/ASK Transmitter 3901007108 Page 9 of 14 Data Sheet Rev. 008 May/03 5 Test Circuit Fig. 2: Test circuit for FSK, ASK and FM; with 50 Ω matching network 5.1 Test circuit component list (Fig. 2) Part Size Value Tolerance Description CF1 0603 5.6 nF ±10% loop filter capacitor CF2 0603 27 pF ±10% loop filter capacitor CX1_FSK 0603 56 pF ±5% XOSC capacitor for FSK ( ∆f = ±30 kHz), note 1 CX1_ASK 0603 18 pF ±5% XOSC capacitor for ASK, trimmed to fC, note 1 CX2 0603 1 nF ±5% XOSC capacitor (for FSK only), note 1 CX3 0603 1 nF ±10% XOSC capacitor (for FM only) C1 0603 0.47 pF ±5% impedance matching capacitor C2 0805 1.0 pF ±5% impedance matching capacitor C3 0805 1.8 pF ±5% impedance matching capacitor C4 0603 150 pF ±5% impedance matching capacitor C5 0603 330 pF ±10% blocking capacitor C6 0603 330 pF ±10% blocking capacitor C7 1206 220 nF ±20% blocking capacitor L1 0603 10 nH ±5% impedance matching inductor L2 0603 15 nH ±5% impedance matching inductor L3 0805 15 nH ±5% impedance matching inductor RF1 0805 1.6 k Ω ±10% loop filter resistor RF2 0805 2.0 k Ω ±10% loop filter resistor RPS 0805 56 k Ω ±10% power-select resistor R1 0805 470 k Ω ±10% optional pull-up resistor R2 0805 30 k Ω ±10% varactor bias resistor, (for FM only) R3 0805 0 Ω ±10% ASK jumper, (for ASK only) V1 SOD323 BB535 varactor diode (for FM only) XTAL HC49/S 27.1344 MHz fundamental wave ±30ppm calibr. ±30ppm temp. crystal, Cload = 12 pF to 15 pF, C0, max = 7 pF, Rm, max = 40 Ω Note 1: value depends on crystal parameters XTAL CX2 CX1 RF1 R2 R3 CX3 R1 CF1 CF2 C7 RPS RF2 V1 1 2 12 12 3 12 1 2 1 2 L2 C6 L1 C5 C1 OUT L3 C3 C4 C2 |
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