micrf218 Micrel Semiconductor, micrf218 Datasheet
micrf218
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micrf218 Summary of contents
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... IF section with image rejection to bring performance, simplicity and ease of implementation to the receiver portion of RF actuation. The MICRF218 is a true RF in, data out receiver. IF filter and image rejection functions are built-in. Dual IF bandwidths enable the MICRF218 to capture signals from either high performance or low cost transmitters. ...
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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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... Received signal strength indication output. Output is from a buffer with 200 ohms typical output 14 RSSI impedance Not Connected Reference resonator connection. 7pF in parallel with low resistance MOS switch to GND during 16 RO2 normal operation. Driven by startup excitation circuit during the internal startup control sequence. September 2007 3 MICRF218 M9999-090607 (408) 944-0800 ...
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... S Maximum Receiver Input Power........................ +10dBm ESD Rating(3) .......................................................... 3KV Electrical Characteristics Specifications apply for VDD = 3.0V, VSS = 0V, CAGC = 4.7uF, CTH = 0.1uF, Bold values indicate –40° +85°C. Symbol Parameter MICRF218 Operating I DD Supply Current Ishut Shut down Current RF/IF Section Image Rejection ...
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... TA = 25º +85ºC SEL0=0, SEL1=0 SEL0=0, SEL1=1 SEL0=1, SEL1=0 SEL0=1, SEL1 MHz, 433.92MHz, note 8 REFOSC TA = 25º +85ºC SEL0=0, SEL1=0 SEL0=0, SEL1=1 SEL0=1, SEL1=0 SEL0=1, SEL1=1 5 MICRF218 Min Typ Max Units 0.1 ± ± 800 nA 1.13 V 1.70 V 9.8131 MHz 9.78823 MHz 13 ...
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... F MHz ) TAB TAB MHz ) × ( parameter at F MHz ) REFOSC TAB 6 Min Typ 0.8V DD 260 600 2 0. ±1.5 200 0 50msec/(200msec the (Average number of ON MICRF218 Max Units V V 0.2V DD µA µsec V mV/ dBm mA Ω Sec M9999-090607 (408) 944-0800 ...
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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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... 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 Switch-able Dual IF Bandwidths, the OOK Demodulator, and Reference and Control Logics. Outside the device, the MICRF218 requires only three ...
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... IF signal to proper level for demodulation. IF Bandwidth General Description The MICRF218 has IF filters which may be configured for operation in a narrow band or wide band mode using the IF_BW pin. This pin must not be left floating; it must be tied to VDD or VSS. With the use ...
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... 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 ...
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... Logic through parallel Inputs: SEL0, SEL1, SHDN and IF_BW. Reference Oscillator (Operating Freq) (6) 433.92 - default The reference oscillator in the MICRF218 (Figure 6) uses a basic Colpitts crystal oscillator configuration 13 This threshold is The voltage developed on the Figure 6. Reference Oscillator Circuit M9999-090607 (408) 944-0800 MICRF218 ...
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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 for either narrow or wide September 2007 provide negative bandwidth ...
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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 good start for most applications. It has a helical PCB antenna with its matching network, ...
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... Table 3. Band-Pass-Filter Front-End Values There is no need for the bandpass-filter front-end for applications where it is proven that the outside band noise does not cause a problem. The MICRF218 has image reject mixers which improve significantly the selectivity and rejection of outside band noise. ...
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... NB 13.517827, NB 9.788232, WB 12.118764, WB 12.988829, WB 13.483523, WB September 2007 www.hib.com.br ). Carrier (MHz) HIB Part Number 315 SA-9.813135-F-10-G-30-30-X 390.0 SA-12.149596-F-10-G-30-30-X 418.0 SA-13.021874-F-10-G-30-30-X 433.92 SA-13.517827-F-10-G-30-30-X 315 SA-9.788232-F-10-G-30-30-X 390.0 SA-12.118764-F-10-G-30-30-X 418.0 SA-12.988829-F-10-G-30-30-X 433.92 SA-13.483523-F-10-G-30-30-X Table 5. Crystal Frequency and Vendor Part Number 17 MICRF218 M9999-090607 (408) 944-0800 ...
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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 top layer close to the REFOSC pins RO1 and RO2. When care is not taken ...
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... DO pin around 1msec time, and 2msec over the temperature range of the device. See Figures 12. Table Cth Cagc (C6) (Cagc) 100nF 4.7µF 47nF 2.2µF 22nF 1µF 10nF 0.47µF Figure 12. Time-to-Good Data After Shut Down Cycle, 19 MICRF218 Room Temperature M9999-090607 (408) 944-0800 ...
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... RF circuits. Avoid thick traces, the higher the frequency, the thinner the trace should be in order to minimize losses in the RF path. Figure 14. QR218HE1 Top Layer. Figure15. QR218HE1 Bottom Layer, Mirror Image. 20 MICRF218 M9999-090607 (408) 944-0800 ...
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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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... CON6 24nH 5%, 0402/0603 ACT1 39nH 5%, 0402/0603 ACT1 30nH 2%, 0402/0603 ACT1 (np) 0402, not placed Vishay 100kΩ , 0402 (np)13.51783MHz Crystal 13.51783MHz Crystal QSOP16 22 MICRF218 Description M9999-090607 (408) 944-0800 Qty ...
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... A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. September 2007 QSOP16 Package Type (AQS16) © 2007 Micrel, Incorporated. 23 MICRF218 M9999-090607 (408) 944-0800 ...
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... Micrel Revision History Date Edits by: September 2007 24 MICRF218 Revision Number M9999-090607 (408) 944-0800 ...