DATA SHEET SE2438T: 2.4 GHz ZigBee /Smart Energy Front-End Module Applications Smart meters In-home appliances Smart thermostats Logic Control PA Features VB IN TRXP Integrated: ANT TRXN PA with up to +16 dBm output power Balun LNA with programmable bypass LNA Transmit and receive switching function Y1854 +2.7 dB FEM Rx NF Figure 1. SE2438T Block Diagram Differential Rx/Tx interface with integrated balun Fast switch on/off time <800 ns 2.0 V to 3.6 V supply operation Sleep mode current 0.05 A typical Description QFN (20-pin, 3.0 mm x 3.0 mm x 0.55 mm) package The SE2438T is a high-performance, fully integrated RF front-end (MSL1 260 C per JEDEC J-STD-020) module (FEM) that is designed for ZigBee /Smart Energy applications. TM The SE2438T is designed for ease of use and maximum flexibility, Skyworks Green products are compliant with with integrated fully matched input balun, integrated inter-stage all applicable legislation and are halogen-free. matching and harmonic filter, and digital controls that are For additional information, refer to Skyworks TM compatible with 1.6 V to 3.6 V Complementary Metal Oxide Denition of Green , document number Semiconductor (CMOS) levels. SQ040074. The RF blocks operate over a wide supply voltage range from 2.0 V to 3.6V, which allows the SE2438T to be used in battery- powered applications over a wide spectrum of the battery discharge curve. A functional block diagram is shown in Figure 1. The pin configuration and package are shown in Figure 2. Signal pin 1 15 DNC VCC1 assignments and functional pin descriptions are provided in 14 GND 2 Table 1. VB IN 3 13 ANT TRXP 12 CSD 4 TRXN CTX 5 11 GND Y0770 Figure 2. SE2438T Pinout20-Pin QFN (Top View) Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 202414I Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice November 19, 2015 1 6 20 GND VCC 19 VCC2 N/C 7 8 18 GND CPS 17 N/C GND 9 16 CRX 10 N/C CPS CTX CSD CRXDATA SHEET SE2438T: 2.4 GHz SMART ENERGY/ZIGBEE FRONT-END MODULE Table 1. SE2438T Signal Descriptions Pin Name Description Pin Name Description 1 VCC1 Positive supply 12 CSD Sleep mode control 2 VB IN Bias voltage input supply to the transceiver (see Figure 3) 13 ANT Connect to 50 antenna 3 TRXP Input/output signal to the transceiver, 100 differential 14 GND Connect to PCB ground 4 TRXN Input/output signal to the transceiver, 100 differential 15 DNC Do not connect 5 GND Connect to PCB ground 16 N/C Not connected 6 VCC Positive supply 17 N/C Not connected 7 N/C Not connected 18 GND Connect to PCB ground 8 CPS Bypass mode control, connect to RFIC or SoC GPIO 19 VCC2 Positive supply 9 GND Connect to PCB ground 20 GND Connect to PCB ground 10 CRX Receive function control Exposed die paddle electrical and thermal ground connect to GND Paddle PCB ground 11 CTX Transmit function control FEM Optional Output Filter 2n7 SoIC 1 pF 1 pF VB IN VDD PA 1 k each series resistor, placed close to the SE2438T pins. CPS CSD CTX CRX Internal Lattice Balun 1.8 V Input Differential source or load impedance symbol Input Decoupling capacitor 1.8 V on chip 1.8 V VBIAS IN The balun at the FEM PA input (or LNA output) can also be used to inject a bias operating point for the transceiver output stage (the shunt inductor provides a DC path on the other side). The inductor also tunes out any parasitic capacitance. If the SOIC transceiver does not require a DC bias, leave the VB IN open. Y1855 Figure 3. Injecting a Bias Operating Point for the Transceiver Output Stage Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 2 November 19, 2015 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice 202414I