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CC400-RTR2 数据表(PDF) 14 Page - Texas Instruments |
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CC400-RTR2 数据表(HTML) 14 Page - Texas Instruments |
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14 / 31 page  CC400 SWRS050 Page 14 of 32 16. Application Circuit Very few external components are required for operation of CC400. A typical application circuit for 433.92 MHz operation is shown in Figure 8. 1.2 kbps data rate and 20 kHz FSK separation are used. Typical component values are shown in Table 11. 16.1. Input / output matching L51 and C51 are the input match for the receiver, and L61 and C61 are the output match for the transmitter. An internal T/R switch circuitry makes it possible to connect the input and output together matching to 50 Ω. See “Input/output matching” p.16 for details. 16.2. Synthesizer loop filter and VCO tank The PLL loop filter consists of C121-C123 and R121-R123. The Component values are easily calculated using the SmartRF Studio software. The VCO tank consists of C91-C93, L91 and the varactor (VAR). C91 determines the coupling to the internal VCO amplifier, and thus the VCO loop gain. This loop gain is also controlled by the ‘VCO gain’ setting in SmartRF Studio, by changing the amplifier current. C92 together with the varactor’s capacitance ratio determines the VCO sensitivity (MHz/V). The sensitivity should be 20 MHz/V. L91 and C93 is used to set the absolute range of the VCO. See Application Note AN012 “VCO fine-tuning CC400 and CC900” for more details. 16.3. Additional filtering Additional external components (e.g. ceramic IF-filter, RF LC or SAW-filter) may be used in order to improve the performance for specific applications. See also “Optional LC filter” p.17 for further information. 16.4. Voltage supply decoupling C10-C12, C24-C25, C210 and C211 are voltage supply de-coupling capacitors. These capacitors should be placed as close as possible to the voltage supply pins of CC400. The CC400DB should be used as a reference design. LC or SAW FILTER 1 14 15 AVDD AGND AGND AGND RF_IN RF_OUT AVDD AVDD VCO_IN AGND AGND AVDD CHP_OUT AVDD IF_OUT IF_IN STROBE PDATA CLOCK DIO DVDD DVDD DGND LOCK DGND XOSC_Q2 AGND XOSC_Q1 C51 L51 L61 C61 XTAL C122 C121 R121 R122 C123 R123 C91 C92 L91 VAR C93 2 3 4 6 5 7 8 9 11 12 13 10 28 27 26 25 23 24 22 21 20 18 17 16 19 C151 C161 Monopole antenna AVDD=3V DVDD=3V C10 C11 C12 C210 C211 455kHz Optional Optional C24 C25 R7 LC or SAW FILTER 1 14 15 AVDD AGND AGND AGND RF_IN RF_OUT AVDD AVDD VCO_IN AGND AGND AVDD CHP_OUT AVDD IF_OUT IF_IN STROBE PDATA CLOCK DIO DVDD DVDD DGND LOCK DGND XOSC_Q2 AGND XOSC_Q1 C51 L51 L61 C61 XTAL XTAL C122 C121 R121 R122 C123 R123 C91 C92 L91 VAR C93 2 3 4 6 5 7 8 9 11 12 13 10 28 27 26 25 23 24 22 21 20 18 17 16 19 C151 C161 Monopole antenna AVDD=3V AVDD=3V DVDD=3V C10 C11 C12 C210 C211 455kHz Optional Optional C24 C25 R7 Figure 8: Typical CC400 application for 433.92 MHz operation. |
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