DATA SHEET SKY65338-21: 450-470 MHz Transmit/Receive Front-End Module Applications Description Skyworks SKY65338-21 is a high-efficiency Front-End Module x Tetra radio (FEM) that incorporates a transmit and receive path, and an x Remote metering antenna transmit/receive (T/R) switch. x GSM The transmit path consists of a high efficiency Power Amplifier x WLL transmitters (PA) followed by an harmonic filter for rejection of harmonic frequencies. The PA is implemented using Skyworks high reliability Features Heterojunction Bipolar Transistor (HBT) process and is Class AB x Transmit output power > +25 dBm biased to provide maximum efficiency with a low spurious output. x High gain in transmit path: 32 dB A high linearity and high isolation Single-Pole Double-Throw (SPDT) switch is used at the common antenna interface between x High transmit/receive isolation > 30 dB the transmit and receive paths. The receive path is a low insertion x Internal RF match and bias circuits loss through-path with input and output ports internally matched x All RF ports internally DC blocked to 50 . x Single DC supply = +3.6 V The device is mounted in a 12-pin, 8 x 8 mm Multi-Chip Module (MCM) Surface-Mounted Technology (SMT) package, which x Small footprint, MCM (12-pin, 8 x 8 mm) SMT package (MSL3, allows for a highly manufacturable low-cost solution. 260 q C per JEDEC J-STD-020) A block diagram of the SKY65338-21 is shown in Figure 1. The device package and pinout for the 12-pin MCM are shown in Skyworks offers lead (Pb)-free RoHS (Restriction of Figure 2. Signal pin assignments and functional pin descriptions Hazardous Substances) compliant packaging. are provided in Table 1. SPDT Switch Transmit PA Port Antenna Port Harmonic Filter Receive Port S1346 Figure 1. SKY65338-21 Block Diagram Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 201004C Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice October 13, 2009 1 DATA SHEET SKY65338-21 TRANSMIT/RECEIVE FRONT-END MODULE 12 11 10 1 9 TX IN V1 2 8 GND V2 3 7 RX OUT ANT 4 5 6 S1347 Figure 2. SKY65338-21 Pinout 12-Pin MCM (Top View) Table 1. SKY65338-21 Signal Descriptions Pin Name Description Pin Name Description 1 TX IN Transmit RF input 7 ANT Antenna 2 GND Ground 8 V2 Switch logic (see Table 1) 3 RX OUT Receive RF output 9 V1 Switch logic (see Table 1) 4 VC BIAS +3.6 V DC supply 10 VCC2 +3.6 V DC supply 5 VREF1 +3.6 V DC supply 11 PA EN PA enable switch (On = 2.5-3.6 V Off = 0-0.2 V) 6 VREF2 +3.6 V DC supply 12 VCC1 +3.6 V DC supply Technical Description Operational Modes The SKY65338-21 provides input and output amplifier stages, and The modules receive and transmit modes are configured using is internally matched for optimum efficiency. An active bias circuit the V1 and V2 control signals (pins 9 and 8, respectively). The provides the input and output stages with excellent gain tracking transmit path provides an harmonic filter and high efficiency PA. over temperature and voltage variations. The module operates The receive path provides a low loss <1 dB bypass between the with positive DC voltages, and maintains high efficiency and good antenna port and the receive port. linearity. The nominal operating voltage is 3.6 V for maximum power, but the device can be operated at slightly lower voltages Electrical and Mechanical Specifications for other mobile applications. The absolute maximum ratings of the SKY65338-21 are provided The SKY65338-21 is internally matched for optimum linearity and in Table 2. The recommended operating conditions are specified efficiency. The input and output stages are independently in Table 3 and electrical specifications are provided in Table 4. supplied using the VCC1 and VCC2 supply lines (pins 12 and 10, respectively). The bias reference voltages for stages 1 and 2 are Typical performance characteristics of the SKY65338-21 are supplied using common lines VREF1 and VREF2 (pins 5 and 6, illustrated in Figures 3 through 10. The state of the SKY65338-21 respectively). The DC control voltage that sets the bias for is determiend by the logic provided in Table 5. stages 1 and 2 is supplied by the VC BIAS signal, pin 4. Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 2 October 13, 2009 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice 201004C VC BIAS VCC1 VREF1 PA EN VREF2 VCC2