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CC1150 Datasheet(PDF) 11 Page - Texas Instruments |
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CC1150 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 67 page CC1150 SWRS037A Page 11 of 60 6 Circuit Description BIAS XOSC_Q1 XOSC_Q2 XOSC FREQ SYNTH RADIO CONTROL RF_P RF_N CSn SI SO (GDO1) SCLK GDO0 (ATEST) RBIAS PA Figure 2: CC1150 Simplified Block Diagram A simplified block diagram of CC1150 is shown in Figure 2. The CC1150 transmitter is based on direct synthesis of the RF frequency. The frequency synthesizer includes a completely on-chip LC VCO. A crystal is to be connected to XOSC_Q1 and XOSC_Q2. The crystal oscillator generates the reference frequency for the synthesizer, as well as clocks for the digital part. A 4-wire SPI serial interface is used for configuration and data buffer access. The digital baseband includes support for channel configuration, packet handling and data buffering. 7 Application Circuit Only a few external components are required for using the CC1150. The recommended application circuits are shown in Figure 4 and Figure 5. The external components are described in Table 13, and typical values are given in Table 14. 7.1 Bias resistor The bias resistor R141 is used to set an accurate bias current. 7.2 Balun and RF matching The components between the RF_N/RF_P pins and the point where the two signals are joined together (C111, C101, L101 and L111 for the 315/433 MHz design. L101, L111, C101, L102, C111, C102 and L112 for the 868/915 MHz reference design) form a balun that converts the differential RF signal on CC1150 to a single-ended RF signal. C104 is needed for DC blocking. Together with an appropriate LC filter network, the balun components also transform the impedance to match a 50 Ω antenna (or cable). C105 provides DC blocking and is only needed if there is a DC path in the antenna. For the 868/915 MHz reference design, this component may also be used for additional filtering, see section 7.5 below. Suggested values for 315 MHz, 433 MHz and 868/915 MHz are listed in Table 14. The balun and LC filter component values and their placement are important to achieve optimal performance. It is highly recommended to follow the CC1150EM reference design ([1] and [2]). Gerber files and schematics for the reference designs are available for download from the TI website. |
Similar Part No. - CC1150_13 |
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Similar Description - CC1150_13 |
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