MICRF213 3.3V, QwikRadio 315MHz Receiver General Description Features -2 The MICRF213 is a general purpose, 3.3V QwikRadio Up to 110dBm sensitivity, 1kbps and BER 10 receiver that operates at 315MHz with a typical Image rejection mixer sensitivity of -110dBm. Frequency from 300MHz to 350MHz The MICRF213 functions as a super-heterodyne Low current consumption: 3.9mA 315MHz, receiver for OOK and ASK modulation up to 7.2kbps. continuous on data rates to 7.2kbps (Manchester The down-conversion mixer also provides image Encoded) rejection. All post-detection data filtering is provided on Analog RSSI output the MICRF213. Any one of four filter bandwidths may be No IF filter required selected externally by the user using binary steps (from 1.18kHz to 9.44kHz, Manchester Encoded). The user Excellent selectivity and noise rejection need only configure the device with a set of easily Low external part count determined values, based upon data rate, code modulation format, and desired duty-cycle operation. Datasheets and support documentation are available on Micrels website at: www.micrel.com. Typical Application 315MHz, 1kHz Baud Rate Example QwikRadio is a registered trademark of Micrel, Inc. Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MICRF213 Ordering Information Part Number Temperature Range Package MICRF213AYQS 40C to +105C 16-Pin QSOP Pin Configuration RO1 1 16 RO2 GNDRF 2 15 NC ANT 3 14 RSSI GNDRF 4 13 CAGC VDD 5 12 CTH SQ 6 11 SEL1 SEL0 7 10 DO SHDN 8 9 GND 16-Pin QSOP (QS) (Top View) Pin Description 16-Pin Pin Pin Function QSOP Name Reference resonator input connection to Colpitts oscillator stage. May also be driven by external reference 1 RO1 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. 6 SQ Squelch control logic input with an active internal pull-up when not shut down. Logic control input with active internal pull-up. Used in conjunction with SEL1 to control the demodulator low 7 SEL0 pass filter bandwidth. (See filter table for SEL0 and SEL1 in application section) 8 SHDN Shutdown logic control input. Active internal pull-up. 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 low 11 SEL1 pass filter bandwidth. (See filter table for SEL0 and SEL1 in application subsection) Demodulation threshold voltage integration capacitor connection. Tie an external capacitor across CTH pin 12 CTH and GND to set the settling time for the demodulation data slicing level. Values above 1nF are recommended and should be optimized for data rate and data profile. AGC filter capacitor connection. CAGC capacitor, normally greater than 0.47uF, is connected from this pin to 13 CAGC GND 14 RSSI Received signal strength indication output. Output is from a buffer with 200 ohms typical output impedance. 15 NC Not Connected (Connect to Ground) Reference resonator input connection to Colpitts oscillator stage, 7pF, in parallel with low resistance MOS 16 RO2 switch-to-GND, during normal operation. Driven by startup excitation circuit during the internal startup control sequence. Revision 2.0 August 19, 2015 2