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CC1010-RTY1 Folha de dados(PDF) 84 Page - Texas Instruments |
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CC1010-RTY1 Folha de dados(HTML) 84 Page - Texas Instruments |
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84 / 152 page  CC1010 SWRS047 Page 84 of 152 low-noise amplifier (LNA) and converted down to the intermediate frequency (IF) by the mixer (MIXER). In the intermediate frequency stage (IF STAGE) this down- converted signal is amplified and filtered before being fed to the demodulator (DEMOD). As an option a RSSI signal or the IF signal after the mixer is available at the AD2(RSSI/IF) pin. After demodu- lation the digital data is sent to the RFBUF register. Interrupts can be generated for each bit or byte received (EXIF.RFIF). In transmit mode the voltage controlled oscillator (VCO) output signal is fed directly to the power amplifier (PA). The RF output is frequency shift keyed (FSK) by the digital bit stream fed to the RFBUF register. Interrupts can be generated for each bit or byte to be transmitted (EXIF.RFIF). The internal T/R switch circuitry makes the antenna interface and matching very easy using a few passive components. The frequency synthesiser generates the local oscillator signal which is fed to the MIXER in receive mode and to the PA in transmit mode. The frequency synthesiser consists of a crystal oscillator (XOSC), phase detector (PD), charge pump (CHARGE PUMP), internal loop filter (LPF), VCO, and frequency dividers (/R and /N). An external crystal must be connected to the XOSC. Only one external inductor is required for the VCO. A detailed pin description is given at page 15. |
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