MICRF218AYQS Micrel Inc, MICRF218AYQS Datasheet

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... Duty Cycling Capable > 100:1 (shut down mode) • Analog RSSI Output • filter required • Excellent selectivity and noise rejection • Low external part count Ordering Information It has analog RSSI Part Number MICRF218AYQS of dual frequency MICRF218 ® 300 MHz to 450 MHz Receiver Temperature Range Package – ...

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... SEL0 and SEL1 in application subsection) 8 SHDN Shutdown logic control input. Active internal pull-up and must be pulled low for Normal Operation. 9 GND Negative supply connection for all chip functions except RF input. September 2007 U1 MICRF218AYQS 1 RO1 2 GNDRF 3 ANT 4 GNDRF ...

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Micrel 16-Pin Pin Pin Function QSOP Name 10 DO Demodulated data output. Logic control input with active internal pull-up. Used in conjunction with SEL0 to control the 11 SEL1 demodulator low pass filter bandwidth. (See filter table for SEL0 and ...

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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 Electrical ...

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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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Micrel Typical Characteristics September 2007 7 MICRF218 M9999-090607 (408) 944-0800 ...

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Micrel September 2007 8 MICRF218 M9999-090607 (408) 944-0800 ...

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Micrel LO Leakage in RF Port September 2007 Re-radiation from MICRF218 Antenna Port 9 MICRF218 M9999-090607 (408) 944-0800 ...

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Micrel ANT Amp VDD f LO VSS SEL0 SYNTHESIZER SEL1 IF_BW Reference and Control SHDN Functional Description Figure 1 illustrates the basic structure of the MICRF218 composed of three sub-blocks; Image Rejection UHF Down-converter with ...

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Micrel passes through a third order band pass filter. The IF Band-Pass filters are fully integrated inside the MICRF218. After filtering, four active gain controlled amplifier stages enhance the IF signal to proper level for demodulation. IF Bandwidth General Description ...

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... COM SHDN REF-OSC CNTR 7 COM Figure 4. Dual Frequency QR218BP_SWREF, 315 MHz and 390 MHz September 2007 EXTERNAL REFERENCE OSCILLATOR INPUT 2 2 REFOSC MICRF218AYQS 1 16 RO1 RO2 2 15 GNDRF ANT RSSI 4 13 GNDRF CAGC 5 12 VDD CTH 6 11 IF_BW SEL1 ...

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Micrel 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 ...

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Micrel 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) to calculate reference oscillator crystal frequency ...

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Micrel 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 ...

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Micrel Table 3 shows the most used frequency values. Freq (MHz) C8 (pF) 6.8 315.0 390.0 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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Micrel 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 < 50 Ω ...

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Micrel 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 ...

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Micrel 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 ...

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Micrel 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 ...

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Micrel September 2007 Figure 16. QR218HE1 Top Silkscreen Layer. Figure 17. QR218HE1 Dimensions. 21 MICRF218 M9999-090607 (408) 944-0800 ...

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... Coilcraft / Murata / L2 Coilcraft / Murata / L3 Coilcraft / Murata / R1,R2 HCM49 www.hib.com.br Y1A HC49/US www.hib.com.br U1 MICRF218AYQS Micrel Semiconductor Notes Semiconductor Tel: 800-344-3860 2. Micro Commercial Corp. Tel: 800-346-3371 3. Sumida Tel: 408-982-9660 4. Murata Tel: 949-916-4000 5. Vishay Tel: 402-644-4218 6. Micrel Semiconductor Tel: 408-944-0800 Table 11. QR218HE1 Bill of Materials, 433.92 MHz, Narrow Band. ...

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Micrel 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, ...