SI4438-C2A-GM Silicon Labs

Si4438-C HIGH-PERFORMANCE, LOW-CURRENT TRANSCEIVER Features Frequency Excellent selectivity performance range = 425525 MHz 58 dB adjacent channel 75 dB blocking at 1 MHz Receive sensitivity = 124 dBm Antenna diversity and T/R switch Modulation control (G)FSK Highly configurable packet handler OOK 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 Low battery detector modes Pin Assignments Temperature sensor 30 nA shutdown, 40 nA standby 20-Pin QFN package Data rate = 100 bps to 500 kbps IEEE 802.15.4g ready Preamble Sense Mode Suitable for China regulatory (State 6 mA average Rx current at Grid) 1.2 kbps Fast wake and hop times Power supply = 1.8 to 3.8 V Applications China smart meters Description Silicon Laboratories Si4438 is a high-performance, low-current Patents pending transceivers covering the sub-GHz frequency bands from 425 to 525 MHz. The Si4438 is targeted at the Chinese smart meter market and is especially suited for electric meters. This device is footprint- and pin-compatible with the Si446x radios, which provide industry-leading performance for worldwide sub-GHz applications. The radios are part of the EZRadioPRO family, which includes a complete line of transmitters, receivers, and transceivers covering a wide range of applications. All parts offer outstanding sensitivity of 124 dBm while achieving extremely low active and standby current consumption. The 58 dB adjacent channel selectivity with 12.5 kHz channel spacing ensures robust receive operation in harsh RF conditions. The Si4438 offers exceptional output power of up to +20 dBm with outstanding TX efficiency. The high output power and sensitivity results in an industry-leading link budget of 144 dB allowing extended ranges and highly robust communication links. Rev 1.0 Copyright 2014 by Silicon Laboratories Si4438-C Si4438-C Functional Block Diagram Product Freq. Range Max Output TX Current RX Current Power Si4438 425525 MHz +20 dBm 75 mA 13.7 mA 2 Rev 1.0