DATA SHEET
SKY77517–21 TX-RX iPAC
™
FEM for Dual-Band GSM/GPRS
Applications
•
Dual-band cellular handsets
encompassing
-
Class 4 GSM850
-
PCS1900
-
Class 12 GPRS multi-slot
operation
Description
The SKY77517–21 is a transmit and receive front-end module (FEM) with Integrated Power
Amplifier Control (iPAC™) for dual-band cellular handsets comprising GSM850 and PCS1900
operation. Designed in a low profile, compact form factor, the SKY77517–21 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 GSM850 PA block and a PCS1900 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 GSM850 band and the other PA block supports the 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 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 PCS 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 SKY77517 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.
Features
•
High efficiency
-
GSM850 48%
-
PCS 41%
•
Low transmit supply current
-
GSM850 1.26 A
-
PCS1900 0.9 A
•
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 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
Figure 1. Functional Block Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
200784A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice. • November 6, 2007
1
DATA SHEET
SKY77517-21 TX–Rx iPAC™ FEM FOR DUAL-BAND GSM/GPRS
Electrical Specifications
The following tables list the electrical characteristics of the
SKY77517–21 Front-End Module. The absolute maximum ratings
and recommended operating conditions for the SKY77517–21 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 SKY77517–21 for modes GSM850 and
PCS1900.
Figure 2
presents an application schematic for the
SKY77517–21.
The SKY77517–21 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
Input Power (P
IN
)
Supply Voltage (V
CC
), Standby
V
RAMP
≤
0.3 V
V
LOGIC
≤
0.5 V
Control Voltage (V
RAMP
)
Storage Temperature
Minimum
⎯
⎯
Maximum
15
7
V
CC_MAX
– 0.2 V
(See Table 4)
150
Unit
dBm
V
–0.5
–55
V
°C
Table 2. Recommended Operating Conditions
Parameter
Supply Voltage (V
CC
)
Supply Current (I
CC
)
Operating Case Temperature (T
CASE
)
1
1-Slot (12.5% duty cycle)
2-Slot (25% duty cycle)
1
Minimum
2.7
0
–20
–20
Typical
3.3
Maximum
4.8
1.8
85
85
Unit
V
A
°C
Case Operating Temperature refers to the temperature of the GROUND PAD on the underside of the package.
Table 3. SKY77517–21 Mode Control Logic
Mode
STANDBY
GSM_RX
PCS_RX
GSM_TX
PCS_TX
1
V
LOGIC
TX_En
0
1
1
1
1
X
1
0
0
1
1
Input Control Bits
BS
X
1
0
1
0
1
X = don’t care
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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November 6, 2007 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice. • 200784A
SKY77517-21 TX–Rx iPAC™ FEM FOR DUAL-BAND GSM/GPRS
DATA SHEET
Table 4. SKY77517–21 Electrical Specifications
1
(1 of 5)
General
Parameter
Supply voltage
Power control impedance
VLOGIC control voltage
LOW
HIGH
VLOGIC current
LOW
HIGH
Band Select current
TX_EN control voltage
TX_EN current
LOW
HIGH
V
CC
Z
VRAMP
V
LOGIC_LOW
V
LOGIC_HIGH
I
VLOGIC
V
BS_LOW
V
BS_HIGH
I
BS
V
TX_EN_LOW
V
TX_EN_HIGH
I
TX_EN
TX_EN
≤
2.7 V
V
CC
≤
4.8 V
V
LOGIC
= V
LOGIC_LOW
V
RAMP
≤
0.1 V
TX_EN
≤
0.4 V
BS
≤
0.4 V
BS
≥
V
LOGIC
– 0.4 V
T
CASE
= 25
°C
P
IN
≤
–60 dBm
V
CC
≤
4.8 V
1.2 V
≤
V
LOGIC
≤
2.7 V
V
RAMP
≤
0.1 V
TX_EN
≤
0.4 V
BS
≤
0.4 V
BS
≥
V
LOGIC
– 0.4 V
T
CASE
= 25
°C
P
IN
≤
–60 dBm
BS
≤
2.7 V
⎯
VLOGIC
≤
2.7 V
TX_EN
≤
0.4 V
BS
≤
0.4 V
⎯
Symbol
Test Condition
⎯
⎯
⎯
–0.1
1.2
⎯
–0.1
70%
V
LOGIC
⎯
–0.1
70%
V
LOGIC
⎯
Minimum
2.7
Typical
3.3
300
⎯
⎯
1
⎯
⎯
8
⎯
⎯
8
0.5
V
CC
20
30%
V
LOGIC
V
LOGIC
20
30%
V
LOGIC
V
LOGIC
20
μA
Maximum
4.8
Units
V
kΩ
V
Band Select control voltage
V
μA
V
μA
Standby Mode
I
QS
⎯
2
10
Leakage current
μA
Receive Mode
I
QRX
⎯
15
50
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
200784A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice. • November 6, 2007
3
DATA SHEET
SKY77517-21 TX–Rx iPAC™ FEM FOR DUAL-BAND GSM/GPRS
Table 4. SKY77517–21 Electrical Specifications
1
(2 of 5)
GSM850 Mode (f = 824 to 849 MHz and P
IN
= 0 to 6 dBm)
Parameter
Frequency range
Input power
Analog power control voltage
f
P
IN
V
RAMP
Symbol
Test Condition
—
—
—
V
CC
= 3.3 V
P
OUT
= 33 dBm
TX_EN = V
TX_EN_HIGH
V
RAMP
set for P
OUT
= 33 dBm
pulse width 577 μs
duty cycle 1:8
T
CASE
= 25
°C
V
CC
= 3.3 V
P
IN
= 3 dBm
P
OUT
= 33 dBm
TX_EN = V
TX_EN_HIGH
V
RAMP
set for P
OUT
= 33 dBm
pulse width 577 μs
duty cycle 1:8
T
CASE
= 25 °C
V
CC
= 3.3 V
P
IN
= 3 dBm
P
OUT
= 5 dBm
TX_EN = V
TX_EN_HIGH
V
RAMP
set for P
OUT
= 5 dBm
pulse width 577 μs
duty cycle 1:8
T
CASE
= 25 °C
BW = 3 MHz
5 dBm
≤
P
OUT
≤
33 dBm
V
RAMP
controlled
6
V
CC
= 3.3 V
T
CASE
= 25
°C
P
IN
= 0 dBm
V
CC
= 2.7 V
TX_EN = V
TX_EN_HIGH
T
CASE
= –20
°C
to 85
°C
P
IN
= 0 dBm
V
CC
= 4.8 V
TX_EN = V
TX_EN_HIGH
T
CASE
= –20
°C
to 85
°C
P
IN
= 0 dBm
P
OUT
= 5 to 33 dBm
V
RAMP
controlled
6
P
IN
= 6 dBm
V
RAMP
≤
0.1 V
V
LOGIC
= V
LOGIC _HIGH
TX_EN = V
TX_EN_LOW
Mode = GSM_RX (see
Table 3)
P
IN
= 6 dBm
V
RAMP
≤
0.1 V
V
LOGIC
= V
LOGIC _HIGH
TX_EN = V
TX_EN_HIGH
Mode = GSM_TX (see
Table 3)
5 dBm
≤
P
OUT
≤
33 dBm
Mode = GSM_TX (see
Table 3)
5 dBm
≤
P
OUT
≤
33 dBm
Mode = GSM_TX (see
Table 3)
Minimum
824
0
0.2
Typical
⎯
⎯
⎯
Maximum
849
6
1.8
Units
MHz
dBm
V
Power Added Efficiency
PAE
41
48
⎯
%
Supply Current @ Rated Power
I
CC
_33 dBm
⎯
1.26
1.48
A
Supply Current @ Minimum Power
I
CC
_5 dBm
—
53
60
mA
Harmonics
2nd to 13th
2f
0
to 13f
0
⎯
–40
–33
dBm
P
OUT
33.0
33.7
⎯
Output power
P
OUT _MAX LOW VOLTAGE
30.5
32.2
⎯
dBm
P
OUT_MAX HIGH VOLTAGE
30.5
34.5
⎯
Input VSWR
Γ
IN
⎯
1.5:1
2.5:1
P
OUT_ RX
Forward isolation
4
P
OUT_ENABLED_TX
⎯
–55
–45
dBm
⎯
–25
–5
Coupling of GSM850 TX output (f0) to
GSM_RX output pad
4
Coupling of GSM850 TX output
(2f
0
, 3f
0
) to PCS_RX output pad
4
CGHI_TX-RX_F0
CGHI_TX-PCS_RX
⎯
⎯
3
–45
11
–36
dBm
dBm
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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November 6, 2007 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice. • 200784A
SKY77517-21 TX–Rx iPAC™ FEM FOR DUAL-BAND GSM/GPRS
DATA SHEET
Table 4. SKY77517–21 Electrical Specifications
1
(3 of 5)
GSM850 Mode (f = 824 to 849 MHz and P
IN
= 0 to 6 dBm)
[continued]
Parameter
Symbol
Test Condition
All combinations of the following
parameters:
V
RAMP
= controlled
2
P
IN
= min. to max.
V
CC
= 2.7 V to 4.8 V
Load VSWR = 12:1, all phase angles
All combinations of the following
parameters:
V
RAMP
= controlled
2
P
IN
= min. to max.
V
CC
= 2.7 V to 4.8 V
Load VSWR = 20:1, all phase angles
At f
0
+ 20 MHz (869 to 894 MHz)
RBW = 100 kHz
V
CC
= 3.3 V
5 dBm
≤
P
OUT
≤
33 dBm
T
CASE
= 25 °C
At 1930 to 1990 MHz
RBW = 100 kHz
V
CC
= 3.3 V
T
CASE
= 25 °C
5 dBm
≤
P
OUT
≤
33 dBm
Power control dynamic range
Control level 5-15
(V
CC
≥
3.3 V)
Power control
variation
Control level 16-19
PC
V
PC
DR
P
OUT
13 to 33 dBm
T
CASE
= 25
°C
P
OUT
13 to 33 dBm
P
OUT
5 to 11 dBm
T
CASE
= 25
°C
P
OUT
5 to 11 dBm
Power control slope
PC
S
5 to 33 dBm
GSM850 RECEIVE (f = 869 to 894 MHz) Mode = GSM_RX
Parameter
Frequency range
Insertion Loss, ANT to GSM_RX
4
VSWR ANT, GSM_RX
4
f
IL GSM_RX
Γ
IN
,
Γ
OUT
Symbol
Test Condition
—
—
—
Minimum
869
⎯
⎯
Typical
⎯
1.0
1.2:1
Maximum
894
1.3
1.5:1
Units
MHz
dB
Minimum
Typical
Maximum
Units
Spurious
Spur
No parasitic oscillation > –36 dBm
Load mismatch
Load
No module damage or permanent degradation
⎯
–84
–83
dBm
RX Band Spurious
RX
_SPUR
⎯
–101
–84
30
–1.0
–1.5
–2.0
–3.5
⎯
50
⎯
⎯
⎯
⎯
⎯
⎯
1.0
1.5
dB
dB
2.0
3.5
150
dB/V
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
200784A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice. • November 6, 2007
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