SKY77518-11 Skyworks Solutions, Inc., SKY77518-11 Datasheet

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SKY77518-11

Manufacturer Part Number
SKY77518-11
Description
Sky77518?11 Tx?rx Ipac? Fem For Dual-band Gsm/gprs
Manufacturer
Skyworks Solutions, Inc.
Datasheet

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SKY77518-11
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Part Number:
SKY77518-11A
Quantity:
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PRODUCT SUMMARY
SKY77518–11 Tx–Rx iPAC
Applications
• Dual-band cellular handsets
Features
• High efficiency
• Low transmit supply current
• Internal ICC sense resistor
• Closed loop iPAC
• 50 Ω matched Input/Output
• TX–VCO-to-antenna and
• TX harmonics below –33
• PHEMT RF switches afford
• Small outline: 6 x 8 mm
• Low profile: 1.1 mm
• Compatible with multiple
• Low APC current: 25 μA
encompassing
- Class 4 GSM900
- DCS1800
- Class 12 GPRS multi-slot
- GSM900 48%
- DCS 41%
- GSM900 1.26 A
- DCS1800 0.9 A
for iPAC
antenna-to-RX-SAW filter
RF interface
dBm
high linearity, low insertion
loss, and less than 20 μA
supply current in receive
modes
logic families
operation
201056A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice. • March 13, 2009
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
Description
The SKY77518–11 is a transmit and receive front-end module (FEM) with Integrated Power Amplifier
Control (iPAC
Designed in a low profile, compact form factor, the SKY77518–11 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.
The module consists of a GSM900 PA block and a DCS1800 PA block, impedance-matching circuitry
for 50 Ω input and output impedances, TX harmonics filtering, high linearity and low insertion loss
PHEMT RF switches, diplexer and a Power Amplifier Control (PAC) block with internal current sense
resistor. A custom BiCMOS integrated circuit provides the internal PAC function and decoder circuitry
to control the RF switches. The two Heterojunction Bipolar Transistor (HBT) PA blocks are fabricated
onto a single Gallium Arsenide (GaAs) die. One PA block supports the GSM900 band and the other PA
block supports the DCS1800 band. Both PA blocks share common power supply pads to distribute
current. The output of each PA block and the outputs to the two receive pads are connected to the
antenna pad through PHEMT RF switches and a diplexer. The GaAs die, PHEMT die, Silicon (Si) die
and passive components are mounted on a multi-layer laminate substrate. The assembly is
encapsulated with plastic overmold.
Band selection and control of transmit and receive modes are performed using two external control
pads. Refer to the functional block diagram in
between GSM and DCS modes of operation. The transmit enable (TX_EN) pad controls receive or
transmit mode of the respective RF switch (TX = logic 1). Proper timing between transmit enable
(TX_EN) and Analog Power Control (VRAMP) allows for high isolation between the antenna and TX-
VCO while the VCO is being tuned prior to the transmit burst.
The SKY77518–11 is compatible with logic levels from 1.2 V to VCC for BS and TX_EN pads,
depending on the level applied to the VLOGIC pad. This feature provides additional flexibility for the
designer in the selection of FEM interface control logic.
) for dual-band cellular handsets comprising GSM900 and DCS1800 operation.
Figure 1. SKY77518-11 Functional Block Diagram
FEM for Dual-Band GSM/GPRS
Figure 1
below. The band select pad (BS) selects
1

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SKY77518-11 Summary of contents

Page 1

... Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice. • March 13, 2009 ™ FEM for Dual-Band GSM/GPRS ™ ) for dual-band cellular handsets comprising GSM900 and DCS1800 operation. Figure 1 Figure 1. SKY77518-11 Functional Block Diagram below. The band select pad (BS) selects 1 ...

Page 2

... SKY77518–11 SKY77518–11 SKY77518–11A SKY77518–11A ©2009, Skyworks Solutions, Inc. All Rights Reserved Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein ...

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