MICRF219A-315-EV Microchip

MICRF219A 300MHz to 450MHz ASK/OOK Receiver with Auto-Poll, and RSSI General Description Features The MICRF219A is a 300MHz to 450MHz super- 110dBm sensitivity at 1kbps with 0.1% BER heterodyne, image-reject, RF receiver with automatic gain Auto-polling mode with bit checking control, ASK/OOK demodulator, and analog RSSI output. Supports bit rates up to 20kbps at 433.92MHz It only requires a crystal and a minimum number of 25dB image-reject mixer external components to implement. The MICRF219A is ideal for low-cost, low-power, RKE, TPMS, and remote No IF filter required actuation applications. 60dB analog RSSI output range The MICRF219A achieves 110dBm sensitivity at a bit 3.0V to 3.6V supply voltage range rate of 1kbps with 0.1% BER. Four demodulator filter 4.3mA supply current at 315MHz bandwidths are selectable in binary steps from 1625Hz to 6.0mA supply current at 434MHz 13kHz at 433.92MHz, allowing the device to support bit 13A supply current in sleep mode rates up to 20kbps. The device operates from a supply voltage of 3.0V to 3.6V, and typically consumes 4.3mA of 0.1A supply current in shutdown mode supply current at 315MHz and 6.0mA at 433.92MHz. A 16-pin QSOP package (4.9mm x 6.0mm) shutdown mode reduces supply current to 0.1A typical. 40C to +105 C temperature range 3kV HBM ESD Rating Datasheets and support documentation can be found on Micrels website at: www.micrel.com. Typical Application MICRF219A Typical Application Circuit (433.92MHz, 1kbps) Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MICRF219A Ordering Information Part Number Temperature Range Package MICRF219AAYQS 40 C to +105 C 16-Pin QSOP Pin Configuration MICRF219AAYQS Pin Description Pin Pin Pin Function Number Name Reference resonator connection to the Pierce oscillator. May also be driven by external reference signal of 1 RO1 200mVp-p to 1.5V p-p amplitude maximum. Internal capacitance of 7pF to GND during normal operation. 2 GNDRF Ground connection for ANT RF input. Connect to PCB ground plane. Antenna Input: RF Signal Input from Antenna. Internally AC coupled. It is recommended to use a matching 3 ANT network with an inductor to RF ground to improve ESD protection. 4 GNDRF Ground connection for ANT RF input. Connect to PCB ground plane. Positive supply connection for all chip functions. Bypass with 0.1F capacitor located as close to the VDD 5 VDD pin as possible. Squelch Control Logic-Level Input. An internal pull-up (5A typical) pulls the logic-input HIGH when the 6 SQ device is enabled. This feature is not recommended in MICRF219A and this pin should remain floating. Tie this pin to VDD to ensure robust register programming. Use register bits D 4:3 to set demodulation 7 SEL0 bandwidth. Shutdown Control Logic-Level Input. A logic-level LOW enables the device. A logic-level HIGH places the device in low-power shutdown mode. An internal pull-up (5A typical) pulls the logic input HIGH. To ensure 8 SHDN that the part starts up correctly, connect a 1F capacitor from VDD to SHDN, and a 50k resistor from SHDN pin to GND. After the supply voltage settles, apply a HIGH logic level voltage to SHDN to turn the part off, then a LOW logic level voltage to turn the part on before programming or operating the device. 9 GND Ground connection for all chip functions except for RF input. Connect to PCB ground plane. Data Output. Demodulated data output. A current limited CMOS output during normal operation, 25k pull- 10 DO down is present when device is in shutdown. Tie this pin to VDD to ensure robust register programming. Use register bits D 4:3 to set demodulation 11 SEL1 bandwidth. Revision 3.0 August 12, 2015 2 RadioTech micrel.com or (408) 944-0800