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SKY77518 Datasheet Preview

SKY77518 Datasheet

TX-RX iPAC FEM

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PRELIMINARY DATA SHEET
SKY77518 TX–RX iPAC™ FEM for Dual-Band GSM/GPRS
Applications
Dual-band cellular handsets
encompassing
- Class 4 GSM900
- DCS1800
- Class 12 GPRS multi-slot
operation
Features
High efficiency
- DCS 41%
- GSM900 46%
Low transmit supply current
- GSM900 1.3 A
- DCS1800 0.9 A
Internal ICC sense resistor for iPAC
Closed loop iPAC
50 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: 6 mm x 8 mm
Low profile: 1.2 mm
Compatible with multiple logic
families
Low APC current: 25 µA
Gold plated, lead free contacts
Skyworks offers lead
(Pb)-free "environmentally
friendly" packaging
that is RoHS compliant
(European Parliament
for the Restriction of
Hazardous Substances).
Description
The SKY77518 is a transmit and receive front-end module (FEM) with Integrated Power
Amplifier Control (iPAC™) for dual-band cellular handsets comprising GSM900 and DCS1800
operation. Designed in a low profile, compact form factor, the SKY77518 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 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 Figure 1 below. The band select pad (BS)
selects 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 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.
GSM_IN
VBATT
VRAMP
TX_EN
BS
VLOGIC
DCS
Match
BiCMOS
Integrated
Power
Amplifier
Controller
Antenna
Switch
Decoder
Match
HBT
GSM_OUT
PA Match/
Filter
4
DCS_OUT
PA
Match/
Filter
SKY77518
2
Diplexer
2
GND GSM_RX
Figure 1. Functional Block Diagram
DCS_RX
200472_001
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
200472P1 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice. • November 9, 2005
1




Skyworks

SKY77518 Datasheet Preview

SKY77518 Datasheet

TX-RX iPAC FEM

No Preview Available !

PRELIMINARY DATA SHEET
SKY77518 TX–Rx IPAC™ FEM FOR DUAL-BAND GSM/GPRS
Electrical Specifications
The following tables list the electrical characteristics of the
SKY77518 Front-End Module. The absolute maximum ratings and
recommended operating conditions for the SKY77518 are listed in
Table 1 and Table 2, respectively. Table 3 specifies the mode
control logic and Table 4 contains the electrical characteristics of
the SKY77518 for modes GSM900 and DCS1800. Figure 2
presents an application schematic for the SKY77518.
The SKY77518 is a static-sensitive electronic device and should
not be stored or operated near strong electrostatic fields. Detailed
information on device dimensions, pad descriptions, packaging
and handling can be found in later sections of this data sheet.
Table 1. Absolute Maximum Ratings
Parameter
Minimum
Input Power (PIN)
Supply Voltage (VCC), Standby
VRAMP 0.3 V
VLOGIC 0.5 V
Control Voltage (VRAMP)
–0.5
Storage Temperature
–55
Maximum
15
7
VCC_MAX – 0.2 V
(See Table 4)
+150
Unit
dBm
V
V
°C
Table 2. Recommended Operating Conditions
Parameter
Minimum
Typical
Maximum
Supply Voltage (VCC)
2.7 3.3
Supply Current (ICC)
Operating Case Temperature (TCASE) 1
1-Slot (12.5% duty cycle)
2-Slot (25% duty cycle)
0
–15
–15
1 Case Operating Temperature refers to the temperature of the GROUND PAD on the underside of the package.
5.5
1.8
+85
+85
Unit
V
A
°C
STANDBY
GSM_Rx
DCS_Rx
GSM_TX
DCS_TX
1 X = don’t care
Mode
Table 3. SKY77518 Mode Control Logic
VLOGIC
Input Control Bits
TX_En
BS
0 X1 X1
100
101
110
111
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
2 November 9, 2005 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice. • 200472P1


Part Number SKY77518
Description TX-RX iPAC FEM
Maker Skyworks
Total Page 14 Pages
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