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CC2500 Datasheet(PDF) 15 Page - Texas Instruments |
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CC2500 Datasheet(HTML) 15 Page - Texas Instruments |
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15 / 84 page  CC2500 PRELIMINARY Data Sheet (Rev.1.2) SWRS040A Page 15 of 83 6 Circuit Description BIAS PA RBIAS XOSC_Q1 XOSC_Q2 CSn SI SO (GDO1) XOSC SCLK LNA 0 90 FREQ SYNTH ADC ADC RADIO CONTROL RF_P RF_N GDO2 GDO0 (ATEST) RC OSC Figure 2: CC2500 simplified block diagram A simplified block diagram of CC2500 is shown in Figure 2. CC2500 features a low-IF receiver. The received RF signal is amplified by the low- noise amplifier (LNA) and down-converted in quadrature (I and Q) to the intermediate frequency (IF). At IF, the I/Q signals are digitised by the ADCs. Automatic gain control (AGC), fine channel filtering, demodulation bit/packet synchronization is performed digitally. The transmitter part of CC2500 is based on direct synthesis of the RF frequency. The frequency synthesizer includes a completely on-chip LC VCO and a 90 degrees phase shifter for generating the I and Q LO signals to the down-conversion mixers in receive mode. 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 ADC and 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 CC2500. The recommended application circuit is shown in Figure 3. The external components are described in Table 14, and typical values are given in Table 15. Bias resistor The bias resistor R171 is used to set an accurate bias current. Balun and RF matching C122, C132, L121 and L131 form a balun that converts the differential RF signal on CC2500 to a single-ended RF signal. C121 and C131 are needed for DC blocking. Together with an appropriate LC network, the balun components also transform the impedance to match a 50 Ω antenna (or cable). Component values for the RF balun and LC network are |
Similar Part No. - CC2500_06 |
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Similar Description - CC2500_06 |
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