MICRF218_11 MICREL [Micrel Semiconductor], MICRF218_11 Datasheet
MICRF218_11
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MICRF218_11 Summary of contents
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General Description The MICRF218 is a 3.0V to 3.6V, 300MHz to 450MHz ASK/OOK super-heterodyne selectable Intermediate Frequency (IF) Bandwidths of 550kHz or 1500kHz at 433.92MHz, making it an excellent solution for use with low-cost SAW-based transmitters or transmitters which use ...
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Pin Configuration Pin Description 16-Pin Pin Pin Function QSOP Name Reference resonator input connection to Colpitts oscillator stage. May also be driven by external 1 RO1 reference signal of 1.5V p-p amplitude maximum. 2 GNDRF Negative supply connection associated with ...
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Micrel Absolute Maximum Ratings Supply Voltage (V ) .................................................+5V DD Input Voltage .............................................................+5V Junction Temperature ......................................... +150°C Lead Temperature (soldering, 10sec.) .................. 260°C Storage Temperature (T ) .....................-65ºC to +150°C S Maximum Receiver Input Power ........................+10dBm ESD Rating(3) ......................................................... 3KV ...
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Micrel Symbol Parameter AGC Attack / Decay Ratio AGC pin leakage current AGC Dynamic Range @ fRX = 433.92MHz Reference Oscillator Frequency Input Impedance Input Range Source Current Demodulator CTH Source Impedance CTH Leakage Current Demodulator Filter Bandwidth @ 315 ...
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Micrel Symbol Parameter Digital / Control Functions Input High Voltage Input Low Voltage DO pin output current Output rise and fall times RSSI RSSI DC Output Voltage Range RSSI response slope RSSI Output Current RSSI Output Impedance RSSI Response Time ...
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Typical Characteristics November 2011 6 M9999-111111 (408) 944-0800 ...
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November 2011 7 M9999-111111 (408) 944-0800 ...
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LO Leakage in RF Port November 2011 Re-radiation from MICRF218 Antenna Port 8 M9999-111111 (408) 944-0800 ...
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Functional Description Figure 1 illustrates the basic structure of the MICRF218 composed of three sub-blocks; Image Rejection UHF Down-converter with Switch-able Dual IF Bandwidths, the OOK Demodulator, and Reference and Control Logics. Outside the device, the MICRF218 requires ...
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The IF signal then passes through a third order band pass filter. The IF Band-Pass filters are fully integrated inside the MICRF218. After filtering, four active gain ...
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IF BANDWIDTH CONTROL CON2 VDD = WIDE BANDWIDTH 0V = NARROW BANDWIDTH 100nH 2.2pF 100nH + 33pF 3.9nH Notes Common 2. VDD Input = 3.0 to 3.3V 3. Ref-Osc ...
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Single Crystal Operation for Dual Frequency Operation When using a single crystal, the IF_BW function may be used to switch between two operating frequencies. Bandwidth will scale directly with operating frequency (equation 3). Higher operating frequency will have the wider ...
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Colpitts crystal oscillator configuration with MOS transconductor to resistance. All capacitors shown in Figure 6 are integrated inside the MICRF218. R01 and R02 are external pins of MICRF218. connect reference oscillation crystal. See equation (1) and (2) ...
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Application Information Figure 7. QR218HE1 Application Example, 433.92 MHz, Narrow Band The MICRF218 can be fully tested by using one of many evaluation boards designed at Micrel for this device. As simple demonstrator, the QR218HE1 (Figure 7) offers a good ...
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Micrel Table 3 shows the most used frequency values. Freq (MHz) C8 (pF) 315.0 6.8 390.0 6.8 418.0 6.0 433.92 5.6 Table 3. Band-Pass-Filter Front-End Values There is no need for the bandpass-filter front-end for applications where it is proven ...
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Figure 9. Plotting the Shunt Inductor and Series Capacitor Crystal Y1 may be either SMT or leaded the reference clock for all the device internal circuits. Crystal characteristics of 10pF load capacitance, 30ppm, ESR < 50Ω, -40ºC to ...
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The oscillator of the MICRF218 is Colpitts in configuration very sensitive to stray capacitance loads. Thus, very good care must be taken when laying out the printed circuit board. Avoid long traces and ground plane on the top ...
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Selection of CTH and CAGC Capacitors Capacitors C6 and C4, Cth and Cagc respectively provide time-based reference for the data pattern received. These capacitors are selected according to data profile, pulse duty cycle, dead time between two received data packets, ...
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PCB Considerations and Layout Figures show top, bottom and silkscreen layers of printed circuit board for the QR218HE1 board. Gerber files are downloadable from Micrel Website: www.micrel.com, to fabricate this board. Keep traces as short as possible. ...
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November 2011 Figure 16. QR218HE1 Top Silkscreen Layer. Figure 17. QR218HE1 Dimensions. 20 M9999-111111 (408) 944-0800 ...
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Micrel QR218HE1 Bill of Materials, 433.92 MHz Item Part Number Manufacturer ANT1 ANT2 C9 C4 Murata / Vishay C3 Murata/Vishay C6,C5 Murata / Vishay C8 JP1,JP 2, JP3 JP4 J2 J3 Coilcraft / Murata / L1 Coilcraft / Murata / ...
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Package Information MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no ...
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Revision History Date Edits by: November 2011 23 Revision Number M9999-111111 (408) 944-0800 ...