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TH71221 Datasheet(PDF) 38 Page - Melexis Microelectronic Systems |
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TH71221 Datasheet(HTML) 38 Page - Melexis Microelectronic Systems |
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38 / 44 page  TH71221 27 to 930MHz FSK/FM/ASK Transceiver 39010 071221 Page 38 of 44 Data Sheet Rev. 009 Nov/15 8 Extended Frequency Range The operating frequency range of 300 MHz to 930 MHz can be covered without the use of an additional VCO varactor diode. A frequency range extension down to 27 MHz can be realized by adding an external varactor diode to the VCO tank. Fig. 18: VCO tank circuit for extended frequency range 8.1 Board Component List (Fig. 18) Part Size Value @ 27 MHz Value @ 40 MHz Value @ 80 MHz Value @ 144 MHz Value @ 170 MHz Description C0 0805 NIP NIP NIP NIP NIP VCO tank capacitor C01 0805 1 nF 1 nF 68 pF 100pF 100 pF VCO tank capacitor CB2 0603 330 pF 330 pF 330 pF 330 pF 330 pF de-coupling capacitor VD1 SOD-323 BBY65 BBY65 BB639 BB833 BB535 varactor diode CF1 0605 1 µF 1 µF 1µF 1µF 1µF loop filter capacitor CF2 0605 220 nF 100 nF 100nF 100 nF 100 nF loop filter capacitor CTX4 0605 NIP 33 pF 18pF 10 pF 8.2 pF TX impedance matching capacitor RB0 0605 100 100 100 100 100 protection resistor R01 0805 22 22 0 0 0 VCO tank resistor RF 0805 1.8 k 1.8 k 1.8 k 2.7 k 390 loop filter resistor RF1 0805 10 k 10 k 10 k 10 k 10 k loop filter resistor RPS 0805 15 k 15 k 15 k 22 k 33 k power-select resistor CTX0 0805 10 nF 10 nF 10 nF 1 nF 220 pF TX coupling capacitor CRX0 0805 10 nF 10 nF 10 nF 1 nF 220 pF RX coupling capacitor L0 0805 1.2 µH 1.0 µH 220 nH 100 nH 47 nH VCO tank inductor LTX0 0805 2.2 µH 330 nH 220 nH 100 nH 100 nH TX impedance matching inductor CB6 0805 10 nF 10 nF 10 nF 1 nF 1 nF de-coupling capacitor CB7 0805 100 nF 100 nF 100 nF 100 nF 100 nF de-coupling capacitor fR 25 kHz 25 kHz 25 kHz 25 kHz 100 kHz frequency resolution NT 1080 1600 3200 5760 1700 NT counter NR 1508 2028 2772 5332 1807 NR counter LO injection high high low low high Note: The component values are optimized for the above listed settings of fR, NR and NT. Direct VCO modu- lation as explained in section 3.3.5 must be applied. VCC VCC CB7 CRX0 CTX0 CB2 LTX0 CTX4 13 14 15 16 TH71121 TH71221 IN_DTA ASK/FSK VCC_DIG RE/SCLK GAIN_LNA OUT_PA OUT_LNA VEE_LNA IN_LNA 29 28 27 26 25 L0 C0 RB0 RPS C01 R01 VD1 RF CB6 Lock detect RX_IN TX_OUT SDEN SDTA SCLK 3wire bus Combining network |
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