SKY65338-21

DATA SHEET SKY65338-21: 450-470 MHz Transmit/Receive Front-End Module Applications Tetra radio Remote metering GSM WLL transmitters Description Skyworks SKY65338-21 is a high-efficiency Front-End Module (FEM) that incorporates a transmit and receive path, and an antenna transmit/receive (T/R) switch. The transmit path consists of a high efficiency Power Amplifier (PA) followed by an harmonic filter for rejection of harmonic frequencies. The PA is implemented using Skyworks high reliability Heterojunction Bipolar Transistor (HBT) process and is Class AB biased to provide maximum efficiency with a low spurious output. A high linearity and high isolation Single-Pole Double-Throw (SPDT) switch is used at the common antenna interface between the transmit and receive paths. The receive path is a low insertion loss through-path with input and output ports internally matched to 50 Ω. The device is mounted in a 12-pin, 8 x 8 mm Multi-Chip Module (MCM) Surface-Mounted Technology (SMT) package, which allows for a highly manufacturable low-cost solution. 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 Figure 2. Signal pin assignments and functional pin descriptions are provided in Table 1. Features Transmit output power > +25 dBm High gain in transmit path: 32 dB High transmit/receive isolation > 30 dB Internal RF match and bias circuits All RF ports internally DC blocked Single DC supply = +3.6 V Small footprint, MCM (12-pin, 8 x 8 mm) SMT package (MSL3, 260 C per JEDEC J-STD-020) Skyworks offers lead (Pb)-free RoHS (Restriction of Hazardous Substances) compliant packaging. Transmit Port SPDT Switch PA Harmonic Filter Antenna Port 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 PA_EN 11 VCC1 12 10 TX_IN GND RX_OUT VCC2 1 9 V1 V2 ANT 2 8 3 7 4 5 6 VREF1 VC_BIAS VREF2 S1347 Figure 2. SKY65338-21 Pinout – 12-Pin MCM (Top View) Table 1. SKY65338-21 Signal Descriptions Pin # 1 2 3 4 5 6 TX_IN GND RX_OUT VC_BIAS VREF1 VREF2 Name Description Transmit RF input Ground Receive RF output +3.6 V DC supply +3.6 V DC supply +3.6 V DC supply Pin # 7 8 9 10 11 12 ANT V2 V1 VCC2 PA_EN VCC1 Name Antenna Switch logic (see Table 1) Switch logic (see Table 1) +3.6 V DC supply PA enable switch (On = 2.5-3.6 V; Off = 0-0.2 V) +3.6 V DC supply Description Technical Description The SKY65338-21 provides input and output amplifier stages, and is internally matched for optimum efficiency. An active bias circuit provides the input and output stages with excellent gain tracking over temperature and voltage variations. The module operates with positive DC voltages, and maintains high efficiency and good linearity. The nominal operating voltage is 3.6 V for maximum power, but the device can be operated at slightly lower voltages for other mobile applications. The SKY65338-21 is internally matched for optimum linearity and efficiency. The input and output stages are independently supplied using the VCC1 and VCC2 supply lines (pins 12 and 10, respectively). The bias reference voltages for stages 1 and 2 are supplied using common lines VREF1 and VREF2 (pins 5 and 6, respectively). The DC control voltage that sets the bias for stages 1 and 2 is supplied by the VC_BIAS signal, pin 4. Operational Modes The module’s receive and transmit modes are configured using the V1 and V2 control signals (pins 9 and 8, respectively). The transmit path provides an harmonic filter and high efficiency PA. The receive path provides a low loss