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MICRF008 Datasheet(PDF) 5 Page - Micrel Semiconductor |
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MICRF008 Datasheet(HTML) 5 Page - Micrel Semiconductor |
5 / 12 page July 2003 5 MICRF008 MICRF008 Micrel Functional Description The entire block diagram illustrates the basic structure of the MICRF008BM. It is made of three sub-blocks, which are the UHF Downconverter, the OOK Demodulator, and the Refer- ence and Control. Also shown in the figure are two capacitors (C TH, and CAGC) and the reference frequency device, usually a ceramic resonator. With the exception of a supply decoupling capacitor and the matching network on the antenna pin, these are all the external components needed with the MICRF008BM to make a complete UHF receiver. There is one control input, the SEL0 pin. The purpose is to set the demodulator filter bandwidth of either 2.4kHz or 4.8kHz, and is set high or low according to the minimum pulse width in the demodulated signal. The input is CMOS compatible, and is pulled-up internally in the IC. Receiver Operation The MICRF008BM is a superheterodyne receiver working in sweep mode. It is capable of data rates up to 9.6kbaud NRZ or 4.8kbaud Manchester encoded. The MICRF008BM RF center frequency is controlled by a com- Functional Diagram Comparator ANT VCC VSS SEL0 REFOSC Ceramic Resonator CAGC RF Amp tRF tIF tLO RBC mboer 1MHz Programmable Low-Pass Filter Peak Detector Reference Oscillator Synthesizer Control Logic IF Amp IF Amp CTH DO OOK Demodulator UHF Downconverter Switched-Cap Resistor Reference and Control AGC Control pletely integrated PLL/VCO frequency synthesizer with frequency set by a ceramic resonator. The actual swept bandwidth is approximately 3% of the RF carrier frequency. It makes an ideal part to work with LC-based transmitters or other types of transmitters that are not precise in nature and vary their frequency with time. In sweep mode the LO frequency (local oscillator) is varied in a rate much higher than the data signal, which results in down-conversion of approximately 3% of the carrier frequency present at the antenna pin. The low level RF signal is amplified by the RF amp section and downconverted by the mixer to the IF frequency which is amplified and filtered internally in the device and further amplified for the peak detector. The peak detector will detect the IF and further filtering is accomplished in the programmable low-pass filter. The detected/filtered signal is compared with the DC value of the demodulated signal in the data-slicer and a digital output is provided from the DO pin. |
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