Description
The SKY77543 is a transmit and receive front-end module (FEM) with Integrated Power Amplifier Control (iPAC™) for dual-band cellular handsets comprising 850 and PCS1900 operation. Designed in a low profile, compact form factor, the SKY77543 offers a complete Transmit VCO-to-Antenna and Antenna-to-Receive SAW filter solution. The FEM also supports Class 12 General Packet Radio Service (GPRS) multi-slot operation.

Features
• High efficiency
    - GSM850 45.0%
    - PCS1900 38.5%
• Low transmit supply current
    - GSM850 1.26 A
    - PCS1900 0.93 A
• Internal ICC sense resistor for iPAC
• Closed loop iPAC
• 50 Ω matched Input/Output
• Tx–VCO-to-antenna and antenna-to-Rx-SAW filter RF interface
• Tx harmonics below –33 dBm
• PHEMT RF switches afford high linearity, low insertion loss, and less than 20 μA supply current in receive modes
• Small outline: 7 x 6 mm
• Low profile: 0.9 mm
• Compatible with multiple logic families
• Low APC current: 25 μA

Applications
• Dual-band cellular handsets encompassing
    - Class 4 GSM850
    - PCS1900
    - Class 12 GPRS multi-slot operation