SKY77542数据手册Skyworks中文资料规格书

描述 Description

Please note: this product is being discontinued and is not recommended for new designs.

The SKY77542 is a transmit and receive front-end module (FEM) with Integrated Power AmplifierControl (iPAC™) for dual-band cellular handsets comprising GSM900 and DCS1800 operation.Designed in a low profile, compact form factor, the SKY77542 offers a complete Transmit VCO-to-Antenna and Antenna-to-Receive SAW filter solution. The FEM also supports Class 12 General PacketRadio Service (GPRS) multi-slot operation.

The module consists of a GSM900 PA block and a DCS1800 PA block, impedance-matching circuitryfor 50 Ω input and output impedances, Tx harmonics filtering, high linearity and low insertion lossPHEMT RF switches, diplexer and a Power Amplifier Control (PAC) block with internal current senseresistor. A custom BiCMOS integrated circuit provides the internal PAC function and decoder circuitryto control the RF switches. The two Heterojunction Bipolar Transistor (HBT) PA blocks are fabricatedonto a single Gallium Arsenide (GaAs) die. One PA block supports the GSM900 band and the other PAblock supports the DCS1800 band. Both PA blocks share common power supply pads to distributecurrent. The output of each PA block and the outputs to the two receive pads are connected to theantenna pad through PHEMT RF switches and a diplexer. The GaAs die, PHEMT die, Silicon (Si) dieand passive components are mounted on a multi-layer laminate substrate. The assembly isencapsulated with plastic overmold.

特性 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