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CC1010-RTY1 데이터시트(PDF) 120 Page - Texas Instruments |
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CC1010-RTY1 데이터시트(HTML) 120 Page - Texas Instruments |
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120 / 150 page ![]() CC1010 SWRS047A Page 120 of 146 17.18 Input / Output Matching A few passive external components combined with the internal T/R switch circuitry ensures match in both RX and TX mode. The matching network is shown in Figure 36. Component values for various frequencies are given in Table 28. Component values for other frequencies can be found using the SmartRF ® Studio software. The register MATCH should initially be set as shown in the register description below. The MATCH register controls a capacitor array located at the RF_OUT pin. The register can be used to fine-tune the impedance match for a particular layout and component selection. The tuning can be accomplished by stepping the register values until optimum sensitivity and output power is reached. RF_IN RF_OUT TO ANTENNA CC1010 L51 C51 C52 AVDD=3V L42 C41 Figure 36. Input/output matching network MATCH (0xDC) - Match Capacitor Array Control Register Bit Name R/W Reset value Description 7:3 RX_MATCH (3:0) R/W 0000 Selects matching capacitor array value for RX, step size is 0.4 pF 0000: Use for RF frequency > 500 MHz 1100: Use for RF frequency < 500 MHz 3:0 TX_MATCH (3:0) R/W 0000 Selects matching capacitor array value for TX, step size is 0.4 pF. Recommended setting is 0000 |
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