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SKY77318 is designed for quad-band cellular GSM850/900, DCS1800, and PCS1900 handset applications and GPRS multi-slot operation. The module consists of separate GSM PA and DCS/PCS PA blocks, a PAC block, and matched input/output ports. A custom BiCMOS IC provides the internal PAC function and interface circuitry. The GaAs and Si dies, and the passive components are mounted on a multi-layer laminate substrate and encapsulated with plastic overmold. Switching circuitry selects GSM or DCS/PCS as determined from the BS signal. The VBATT pin connects to an internal current-sense resistor and interfaces to an iPAC? function, which is insensitive to variations in temperature, power supply, process, and input power. Please note: SKY77318 is being discontinued and is not recommended for new design. The suggested replacement is SKY77346 .