Product Summary - Skyworks Solutions, Inc.

PRODUCT SUMMARY
SKY77531 Tx–Rx iPAC™ FEM for Quad–Band GSM/GPRS
Applications
Description
• Quad-band cellular handsets
encompassing
- Class 4 GSM850/900
- DCS1800/PCS1900
- Class 12 GPRS multi-slot
operation
The SKY77531 is a transmit and receive front-end module (FEM) with Integrated Power Amplifier
Control (iPAC™) for quad-band cellular handsets comprising GSM850/900 and DCS1800/PCS1900
operation. Designed in a low profile, compact form factor, the SKY77531 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
- 48% (GSM850/900)
- 41% (DCS1800/PCS1900)
• Low transmit supply current
- 1.26 A (GSM850/900)
- 0.90 A (DCS1800/PCS1900)
• 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 switch affords high
linearity, low insertion loss,
and less than 20 μA supply
current in receive modes
The module consists of a GSM850/900 PA block and a DCS1800/PCS1900 PA block, impedancematching circuitry for 50 Ω input and output impedances, TX harmonics filtering, high linearity and
a low insertion loss PHEMT RF switch, 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
GSM850/900 band and the other PA block supports the DCS1800/PCS1900 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 PHEMT RF switch. 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 are performed using four external control pads.
Refer to the block diagram in Figure 1 below. The band select pads, BS1 and BS2, select CEL,
GSM, DCS and PCS modes of operation. Transmit enable TX_EN and transmit switch enable
TX_SW_EN control receive or transmit mode of the 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 SKY77531 is compatible with logic levels from 1.2 V to VCC for BS1, BS2, TX_EN, and
TX_SW_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.
• Small outline: 6 mm x 8 mm
• Low profile: 1.05 mm
• Compatible with multiple logic
families
• Low APC current: 25 μA
Figure 1. SKY77531 Functional Block Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
200644A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice. • February 6, 2007
Ordering Information
Model Number
Manufacturing Part Number
Package
Operating Temperature
SKY77531
SKY77531
Product Revision
MCM 6 x 8 x 1.05 mm
–20 °C to +85 °C
Date
Description
Revision History
Revision
A
February 6, 2007
Initial Issue - Advance Information
B
May 30, 2008
Revise: Features (p1) Low profile 1.2 to 1.05; Figure 1
Add: GREEN tag (p1) Ordering Information; Revision History
©2007–2008, 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.