Si4438 HIGH-PERFORMANCE, LOW-CURRENT TRANSCEIVER Features  Frequency  Excellent selectivity performance range = 425–525 MHz 58 dB adjacent channel  Receive sensitivity = –124 dBm 75 dB blocking at 1 MHz  Modulation (G)FSK  Antenna diversity and T/R switch control OOK  Highly configurable packet handler  Max output power  TX and RX 64 byte FIFOs +20 dBm  Auto frequency control (AFC)  Low active power consumption  Automatic gain control (AGC) 14 mA RX  Low BOM  Ultra low current powerdown modes  Low battery detector  Temperature sensor    30 nA shutdown, 50 nA standby Data rate = 100 bps to 500 kbps Fast wake and hop times  Power suppl...

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