PRODUCT SUMMARY
SKY77580 Tx Quad-Band / Rx Dual-Band Front-End Module
for GSM / GPRS (824-915 MHz) (1710-1910 MHz)
Applications
•
Dual-band cellular handsets
encompassing
-
Class 4 GSM850/GSM900
-
DCS1800/PCS1900
-
Class 12 GPRS multi-slot
operation
-
EDGE downlink compatible
Description
SKY77580
is a transmit and receive Front-End
Module
(FEM) with integrated power amplifier
control
designed in a low profile, compact form factor for quad-band cellular handsets comprising
GSM850/GSM900 and DCS1800/PCS1900 operation.
The
SKY77580 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 and EDGE downlink.
The module consists of a GSM850/GSM900 PA block and a DCS1800/PCS1900 PA block,
impedance-matching circuitry for 50 ohm input and output impedances, Tx harmonics filtering,
high linearity / low insertion loss RF switch, and a Power Amplifier Control (PAC) block. One PA
block supports the GSM850 /
GSM900
bands and the other PA block supports the
DCS1800/PCS1900 bands. 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 an RF switch. The GaAs die, Switch 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 pad,
BS,
selects GSM850,
GSM900,
DCS, and PCS modes of operation. Transmit enable TxEN controls receive or transmit mode of the
RF switch (Tx = logic 1). Proper timing between transmit enable TxEN 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 SKY77580 is compatible with logic levels from 1.2
V to 2.9 V
for
BS,
TxEN, and VSW_EN pads.
Features
•
High efficiency
-
47%
(GSM850)
-
48%
(GSM900)
-
42%
(DCS1800/PCS1900)
•
Low transmit supply current
-
1.21 A
(GSM850)
-
1.18 A
(GSM900)
-
0.85 A
(DCS1800/PCS1900)
•
50
Ω
matched Input/Output
•
Tx–VCO-to-antenna and
antenna-to-Rx-SAW filter RF
interface
•
RF switch affords high
linearity, low insertion loss,
and 0 V DC on Rx ports
•
Small, low profile package
-
6 mm x 6 mm x 0.9 mm
-
28-pad configuration
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202748A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice. • February 20, 2013
1
Ordering Information
Order Number
SKY77580 Tx Quad-Band / Rx Dual-Band Front-End Module
Order Number
SKY77580
Evaluation Board Part Number
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2012, 2013, Skyworks Solutions, Inc. All Rights Reserved
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