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MC13142 Arkusz danych(PDF) 7 Page - Motorola, Inc |
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MC13142 Arkusz danych(HTML) 7 Page - Motorola, Inc |
7 / 16 page MC13142 7 MOTOROLA RF/IF DEVICE DATA Figure 2. 900 MHz Circuit Side Component Placement View NOTES: The PCB is laidout for the 4DFA (2 pole SMD type) and 4DFB (3 pole SMD type) filters which are available for applications in cellular and GSM,GPS (1.2–1.5 GHz), DECT, PHS and PCS (1.8–2.0 GHz) and ISM Bands (902–928 MHz and 2.4–2.5 GHz). In the component placement shown above, the 926.5 MHz dielectric type image filter is used (Toko Part # 4DFA–926A10). The PCB also accommodates a surface mount SAW filter in an eight or six pin ceramic package for the cellular base and handset frequencies. Recommended manufacturers are Siemens and Murata. Traces are provided on the PCB to evaluate the LNA and mixer separately. The component placement view shows external circuit components used for the 926.5 MHz application circuit. Note: some traces must be cut to accommodate placement of components; likewise some traces must be shorted. The voltage controlled oscillator is shown with the varactor referenced to VEE ground. The PCB is modified as shown to do this. 16:1 broadband impedance transformer is mini circuits part #TX16–R3T; it is in the leadless surface mount “TX” package. Components L and C comprise a low pass filter used to provide narrowband matching at a given IF frequency. For example at 49 MHz C = 36 p and L = 330 nH. The microstrip trace on the ground side of the PCB is intended for a microstrip resonator; it is cut free when using a lump inductor as done above. Mix Lin Cont Mix In LNA Input Toko 926A10 Dielectric Filter 16:1 Impedance Transformer IF Out MC13142D Rev A LNA Output VCC V–Cont 100 p 18 nH 51 PC Rotary Switch L 2.4 p 2.4 p 47 p 390 nH 5.6 p 100 p 33 k 120 k MC13142D LO Buf Out C MMBV809 6.8 nH |
Podobny numer części - MC13142 |
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Podobny opis - MC13142 |
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