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SKY77546 Datasheet Preview

SKY77546 Datasheet

Tx-Rx Front-End Module

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SKY77546 pdf
PRODUCT SUMMARY
SKY77546 Tx–Rx Front-End Module for Dual-Band
GSM / GPRS / EDGEwww.datasheet4u.com
Applications
Dual-band cellular handsets
encompassing
- Class 4 GSM900
- DCS1800
- Class 12 GPRS multi-slot
operation
- Linear EDGE operation
Features
High efficiency
45% (GSM900)
40% (DCS1800)
Current limiting for
protection and extended
battery life
Input/Output internally
matched 50 Ω
TX–VCO-to-antenna and
antenna-to-RX-SAW filter
RF interface
TX harmonics below
–36 dBm
Small outline: 7 x 6 mm
Low profile: 1.0 mm Max.
Low APC current: 25 μA
Description
The SKY77546 is a transmit and receive Front-End Module (FEM) designed in a compact form factor
for dual-band cellular handsets comprising GSM900 and DCS1800 operation. The SKY77546 offers a
complete Transmit VCO-to-Antenna and Antenna-to-Receive SAW filter solution that supports Class
12 General Packet Radio Service (GPRS) multi-slot operation and EDGE operation for handsets and
modules.
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 RF
switches, and a Power Amplifier Control (PAC) block. A custom CMOS integrated circuit provides the
internal PAC function, external interface circuitry, and decoder circuitry to control the RF switches.
The integrated PAC function provides envelope amplitude control by reducing sensitivity to input drive,
temperature, power supply, and process variations. The Heterojunction Bipolar Transistor (HBT) PA
blocks are fabricated onto a single InGaP/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 a diplexer and SP2T switch. The GaAs die, switch 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 RF signal flows are performed using three external
control pads. The band select pad (BS) selects GSM or DCS modes of operation. The TxEN pad selects
receive or transmit mode of the respective RF switch (Tx = logic 1). Proper timing of the logic on this
pad, the band-select pads, and Analog Power Control (APC) allows for high isolation between the
antenna and Tx-VCO while the VCO is being tuned prior to the transmit burst.
The Enable input allows initial turn-on of the PAC circuitry to minimize battery drain. Low leakage
current (6.5 μA, typical) of the dual PA module maximizes handset standby time.
Figure 1. Functional Block Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201052A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice. • March 13, 2009
1



Skyworks Solutions
Skyworks Solutions

SKY77546 Datasheet Preview

SKY77546 Datasheet

Tx-Rx Front-End Module

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SKY77546 pdf
Ordering Information
Model Number
SKY77546
www.datasheet4u.com
Manufacturing
Part Number
SKY77546
Product Revision
Package
MCM 7 x 6 x 0.9
Operating Temperature
–20 °C to +85 °C
©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. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to
update the materials or information and shall have no responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes.
No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or
information provided hereunder, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and Conditions
of Sale.
THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR
A PARTICULAR PURPOSE OR USE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHT; ALL SUCH WARRANTIES ARE HEREBY
EXPRESSLY DISCLAIMED. SKYWORKS DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS.
SKYWORKS SHALL NOT BE LIABLE FOR ANY DAMAGES, INCLUDING BUT NOT LIMITED TO ANY SPECIAL, INDIRECT, INCIDENTAL, STATUTORY, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT
LIMITATION, LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM THE USE OF THE MATERIALS OR INFORMATION, WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED
OF THE POSSIBILITY OF SUCH DAMAGE.
Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury,
death, physical or environmental damage. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for
any damages resulting from such improper use or sale.
Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of
products outside of published parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for
applications assistance, customer product design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters.
Skyworks, the Skyworks symbol, “Breakthrough Simplicity,” DCR, Helios, HIP3, Innovation to Go, Intera, iPAC, LIPA, Polar Loop, and System Smart are trademarks or registered trademarks of
Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for identification purposes only, and are the property of their respective owners. Additional
information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference.


Part Number SKY77546
Description Tx-Rx Front-End Module
Maker Skyworks Solutions
Total Page 2 Pages
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