MICRF218AYQS

MICRF218 3.3V, 315/433MHz Wide-IF Bandwidth ASK Receiver General Description Features The MICRF218 is a 3.0V to 3.6V, 300MHz to 450MHz Fully integrated 300MHz to 450MHz ASK/OOK ASK/OOK super-heterodyne receiver with user receiver selectable Intermediate Frequency (IF) Bandwidths of No external IF filter required 550kHz or 1500kHz at 433.92MHz, making it an Wide IF-bandwidth filter supports reception of SAW excellent solution for use with low-cost SAW-based based and medium-grade (~30ppm) transmitter transmitters or transmitters which use low-cost, medium- Sensitivity at 433.92MHz at 1kbps with 0.1% BER grade (~30ppm) crystals. The device requires a single, low-cost crystal to select the proper RF frequency, o -108dBm sensitivity with 550kHz IF bandwidth integrated Automatic Gain Control (AGC), data slicer, o -106dBm sensitivity with 1500kHz IF bandwidth and programmable baseband filter bandwidths of Low-supply current 1.6kHz to 13kHz allowing the device to support bit-rates o 4.0mA at 315MHz up to 20kbps at 433.92MHz. o 5.5mA at 433.92MHz The MICRF218 consumes 4.0mA of supply current at o 1A low-power shutdown mode 315MHz and 5.5mA of supply current at 433.92MHz. Data rates to 10kbps (Manchester Encoded) The device also features a low-power shutdown mode 433.92MHz where the device consumes 1 A of supply current. The device achieves a sensitivity of -108dBm at 1kbps. For Duty cycling capable > 100:1 (shut down mode) transmitters using higher-quality (~10ppm) crystals, the 60dB analog received signal strength indicator MICRF219A/MICRF220 offer an IF-bandwidth of 16-pin QSOP (4.9mm x 6.0mm) package 330kHz and a sensitivity of -110dBm at 1kbps, which can provide better sensitivity and longer range performance. Datasheets and support documentation are available on Micrels website at: www.micrel.com. Typical Application Y1 9.8131MHz ANT PCB Pattern U1 MICRF218AYQS 1 16 RO1 RO2 C2 2 15 1.5pF 50V GNDRF NC 3 14 ANT RSSI RSSI 4 13 GNDRF CAGC 5 12 +3V VDD CTH 6 11 C1 L1 L2 IF BW SEL1 39nH 6.8pF 68nH 7 10 C4 C5 SEL0 DO DO C3 0.1F 4.7F 8 9 0.1F 16V SHDN GND 16V 6.3V IF BWCONTROL 315MHz/315.802, 900Hz Baud Rate Example QwikRadio is a registered trademark of Micrel, Inc. MLF and MicroLeadFrame are trademarks of Amkor Technology, Inc. Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel MICRF218 Ordering Information Part Number Temperature Range Package MICRF218AYQS 40 to +85C 16-Pin QSOP Pin Configuration RO1 1 16 RO2 2 15 GNDRF NC ANT 3 14 RSSI 4 13 GNDRF CAGC Vdd 5 12 CTH 6 11 SEL1 IF BW SEL0 7 10 DO 8 9 SHDN GND MICRF218AYQS Pin Description 16-Pin Pin Name Pin Function QSOP 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 ANT RF input. RF signal input from antenna. Internally AC-Coupled. It is recommended that a matching network with an 3 ANT inductor to RF ground is used to improve ESD protection. 4 GNDRF Negative supply connection associated with ANT RF input. 5 VDD Positive supply connection for all chip functions. IF bandwidth control logic input. Use VDD for Wide IF Bandwidth or VSS for Narrow IF Bandwidth. This 6 IF BW pin must not be left floating, must be tied to VDD or VSS. Logic control input with active internal pull-up. Used in conjunction with SEL1 to control the demodulator 7 SEL0 low pass filter bandwidth. (See filter table for 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. 10 DO Demodulated data output. Logic control input with active internal pull-up. Used in conjunction with SEL0 to control the demodulator 11 SEL1 low pass filter bandwidth. (See filter table for SEL0 and SEL1 in application subsection) Demodulation threshold voltage integration capacitor. Capacitor to GND sets the settling time for the 12 CTH demodulation data slicing level. Values above 1nF are recommended and should be optimized for data rate and data profile. 13 CAGC AGC filter capacitor. A capacitor, normally greater than 0.47uF, is connected from this pin to GND Received signal strength indication output. Output is from a buffer with 200 ohms typical output 14 RSSI impedance. 15 NC Not Connected Reference resonator connection. 7pF in parallel with low resistance MOS switch to GND during normal 16 RO2 operation. Driven by startup excitation circuit during the internal startup control sequence. 2 Revision 3.0 August 12, 2015 (408) 944-0800