RFFM4202
5.0V, 2.4 GHz
TO 2.5 GHz
HIGH POWER
FRONT END
MODULE
RFFM4202
5.0V, 2.4GHz TO 2.5GHz HIGH POWER
FRONT END MODULE
Package: 6mm x 6mm Laminate
Vreg1
Vreg2
Vreg3
GND
Pdet
Vrx
RX
7
6
5
4
3
2
1
24
GND
ANT
Pdown
8
Bias
23
GND
9
Input
Match
Inter
Stage
Match
Inter
Stage
Match
22
GND
Features
TXIN
10
34dB Typical Gain Across
Frequency Band
P
OUT
= 27.5dBm <2.5%
Dynamic EVM
High Impedance Power
Control
1 x1 MIMO architecture
Integrated 3-stage PA,
filtering, and T/R switch
Integrated Power Detector
21
GND
GND
11
20
Vtx
GND
12
13
Vbias
14
Vcc1
15
GND
16
Vcc2
17
Vcc3
18
GND
19
GND
Functional Block Diagram
Product Description
RFFM4202 is a 1 x 1 MIMO module that is intently specified to address IEEE
802.11b/g/n WiFi 2.4GHz to 2.5GHz customer premises equipment (CPE) applica-
tions. The module has an integrated three-stage linear power amplifier, Tx harmonic
filtering and SPDT switch. The RFFM4202 has fully matched input and output for a
50 system and incorporates matching networks optimized for linear output power
and efficiency. The RFFM4202 is housed in a 6mm x 6mm laminate.
Applications
WiFi IEEE802.11b/g/n
Applications
Customer Premises
Equipment (CPE)
Spread-Spectrum and MMDS
Systems
Ordering Information
RFFM4202SB
5 Piece Bag
RFFM4202SQ
25 Piece Bag
RFFM4202SR
100 Piece Reel
RFFM4202TR7
2500 Piece reel
RFFM4202PCK-410 RFFM4202 Evaluation Board and 5 Piece Bag
Optimum Technology Matching® Applied
DS120427
GaAs HBT
GaAs MESFET
InGaP HBT
SiGe BiCMOS
Si BiCMOS
SiGe HBT
GaAs pHEMT
Si CMOS
Si BJT
GaN HEMT
BiFET HBT
LDMOS
RF MICRO DEVICES®, RFMD®, Optimum Technology Matching®, Enabling Wireless Connectivity™, PowerStar®, POLARIS™ TOTAL RADIO™ and UltimateBlue™ are trademarks of RFMD, LLC. BLUETOOTH is a trade-
mark owned by Bluetooth SIG, Inc., U.S.A. and licensed for use by RFMD. All other trade names, trademarks and registered trademarks are the property of their respective owners. ©2006, RF Micro Devices, Inc.
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or customerservice@rfmd.com.
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RFFM4202
Absolute Maximum Ratings
Parameter
Supply Voltage (RF Applied)
Supply Voltage (No RF Applied)
DC Supply Current (RMS)
Input RF Power with 50 Output Load.
Maximum VSWR with no Damage
Operating Ambient Temperature
Storage Temperature
Maximum Juction Temperature T
J-MAX
Moisture Sensitivity
Rating
-0.5 to +5.25
-0.5 to +6.0
1200
+10
10:1
-40 to +85
-40 to +150
175
MSL3
Unit
V
V
mA
dBm
°C
°C
°C
Caution! ESD sensitive device.
Exceeding any one or a combination of the Absolute Maximum Rating conditions may
cause permanent damage to the device. Extended application of Absolute Maximum
Rating conditions to the device may reduce device reliability. Specified typical perfor-
mance or functional operation of the device under Absolute Maximum Rating condi-
tions is not implied.
The information in this publication is believed to be accurate and reliable. However, no
responsibility is assumed by RF Micro Devices, Inc. ("RFMD") for its use, nor for any
infringement of patents, or other rights of third parties, resulting from its use. No
license is granted by implication or otherwise under any patent or patent rights of
RFMD. RFMD reserves the right to change component circuitry, recommended appli-
cation circuitry and specifications at any time without prior notice.
RFMD Green: RoHS compliant per EU Directive 2002/95/EC, halogen free
per IEC 61249-2-21, < 1000ppm each of antimony trioxide in polymeric
materials and red phosphorus as a flame retardant, and <2% antimony in
solder.
Parameter
Typical Conditions
Tx Performance - 11g/n
Frequency
802.11n Output Power
802.11n Dynamic EVM
802.11g Output Power
802.11n Dynamic EVM
802.11g Output Power
802.11n Dynamic EVM
Second Harmonic
Third Harmonic
Tx Performance - Spectral Mask
802.11b Output Power
802.11n Output Power
Specification
Min.
Typ.
Max.
Unit
Condition
T=25 °C, V
CC
=5.0V, V
REG
=2.9V, using an IEEE802.11g
waveform, 54MBps, unless otherwise noted
Compliance with standard 802.11g/n
2412
27
27.3
27.5
27.5
2.5
27.8
2.5
28
2.5
-40
-50
27.5
27
31.5
27.5
34
23
0.165
1.55
10
6
15
8
925
510
17
7
10
1.4
0.2
2484
3
3
3
-32
-40
MHz
dBm
%
dBm
%
dBm
%
dBm/MHz 11n HT40 MCS0/7 at rated P
OUT
dBm/MHz 11n HT40 MCS0/7 at rated P
OUT
Compliance with standard 802.11b
dBm
dBm
Meet 802.11b CCK 1MBps mask spec
Meet 802.11n HT20/HT40 MSC7 mask
At rated P
OUT
Over temperature of -40°C to +85°C
Drop in gain vs. high gain mode by setting
V
REG2
= 0V
P
OUT
= 5dBm to 30dBm
At rated P
OUT
In specified frequency band
In specified frequency band
At rated P
OUT
V
CC
= 5.0V, V
REG
= 2.9V, and RF = OFF
At rated P
OUT
(PA only)
In TX mode
P
DOWN
= 0V, V
REG
= 2.9V, V
CC
= 5V
P
DOWN
= 0V, V
REG
= 2.9V, V
CC
= 5V
V
CC
= 5V, V
REG
= 0V, P
DOWN
= 0V
802.11g 64QAM 54MBps
At V
CC
= 5.25V; 802.11n HT20 and HT40 MCS7
802.11n HT20 and HT40 MCS7
T
x Performance - Generic
Gain
Gain variation over Temperature
Low Gain Mode - Gain Reduction
Power Detect Range
Power Detect Voltage
Input Return Loss - Tx_in pin
Output Return Loss at ANT Pin
Operating Current
Quiescent Current
PAE (Power Added Efficiency)
I
REG
P
DOWN
Current - V
REG
Supply
P
DOWN
Current - V
CC
Supply
Leakage Current
37
+/-2.5
dB
dB
dB
2.3
V
V
dB
dB
1050
600
10
12.5
2.5
0.6
mA
mA
%
mA
mA
mA
mA
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7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or customerservice@rfmd.com.
DS120427
RFFM4202
Parameter
Tx Performance - Generic
(continued)
Power Supply - V
CC
Power Supply - V
REG1
, V
REG2
, V
REG3
Turn-On Time from Setting of V
REG
Values
Turn-Off Time from Setting of V
REG
Values
Stability
CW P1dB
Rx Performance
Rx Insertion Loss - Rx
Noise Figure
Return Loss - Rx
Rx to ANT Isolation While in Tx
Mode
Rx to Tx Isolation While in Tx mode
Generic Performance
T/R Switching Time
Voltage Logic High
Voltage Logic Low
Control Current - Logic High
Thermal
R
TH_I
ESD
Human Body Model
Charge Device
250
500
500
V
V
V
EIAJESD22-114A, RF pins
EIAJESD22-114A, DC pins
JESD22-C101C, all pins
15
°C/Watt
2.75
0
1
2.9
0.5
3.4
0.3
10
sec
V
V
A
25
10
0.8
0.8
16
30
30
1
1
dB
dB
dB
dB
dB
In specified frequency band
-25
33.5
2.75
5
2.85
5.25
2.95
400
800
33.5
V
V
nsec
nsec
dBm
dBm
Output stable to within 90% of final gain
Output stable to within 90% of final gain
No spurs above -47dBm into 4:1 VSWR
TX mode in 50% duty cycle
Specification
Min.
Typ.
Max.
Unit
Condition
T=25 °C, V
CC
=5.0V, V
REG
=2.9V, using an IEEE802.11g
waveform, 54MBps, unless otherwise noted
RFFM4202 Truth Table
Status
TX Mode
RX Mode
PDOWN
High
Low
VTX
High
Low
VRX
Low
High
Note: PDOWN and VTX can be tied together or controlled separately.
If they are controlled separately, VTX should be ‘On’ before PDOWN in
‘Turn On’, and PDOWN should ‘Off’ before VTX in ‘Turn Off’’
DS120427
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or customerservice@rfmd.com.
3 of 15
RFFM4202
Pin Names and Description
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Pkg Base
Function
VRX
RX
GND
PDET
VREG3
VREG2
VREG1
PDOWN
GND
TXIN
GND
GND
VBIAS
VCC1
GND
VCC2
VCC3
GND
GND
VTX
GND
GND
ANT
GND
GND
Description
Switch control for Rx mode
RF Output is internally matched to 50 and DC blocked.
Ground connection
Power detector provides an output voltage proportional to the RF output power level.
Third stage bias voltage. This Pin requires regulated supply for best performance.
Second stage bias voltage. This Pin requires regulated supply for best performance.
First stage bias voltage. This Pin requires regulated supply for best performance.
Power down pin. Apply <0.3V
DC
to power down the three power amplifier stages. Apply 1.75V
DC
to
5.0V
DC
to power up. If function is not desired, Pin may be connected to V
REG
.
Ground connection
RF input is internally matched to 50 and DC blocked.
Ground connection
Ground connection
Supply voltage for the bias reference and control circuits.
This pin is connected internally to the collector of the 1st stage RF device. To achieve specified perfor-
mance, the layout of these pins should match the Recommended Land Pattern.
Ground connection
This pin is connected internally to the collector of the 2nd stage RF device. To achieve specified perfor-
mance, the layout of these pins should match the Recommended Land Pattern.
This pin is connected internally to the collector of the 3rd stage RF device. To achieve specified perfor-
mance, the layout of these pins should match the Recommended Land Pattern.
Ground connection
Ground connection
Switch control for Tx mode
Ground connection
Ground connection
RF Output is internally matched to 50 and DC blocked.
Ground connection
Ground connection
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7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or customerservice@rfmd.com.
DS120427
RFFM4202
Theory of Operation and Applications
Overview
The RFFM4202 is a single-chip integrated front end module (FEM) for high performance WiFi applications in the 2.4GHz to
2.5GHz ISM band. The FEM greatly reduces the number of external components minimizing footprint and assembly cost of the
overall 802.11b/g/n solution. The RFFM4202 has an integrated b/g/n power amplifier, a power Detector, and Tx filtering and
a Switch, which is capable of switching between WiFi Rx and WiFi Tx operations. The device is manufactured using InGaP HBT
and pHEMT processes on a 6mmx6mmx0.95mm Laminate package. The module meets or exceeds the RF front end needs of
the 802.11b/g/n WiFi RF systems. As the RFFM4202 is fully RF matched to 50 internally and requires minimal external com-
ponents, it is very easy to implement on to PCB designs. To reduce the design and optimization process on the customer appli-
cation, the evaluation board layout should be copied as close as possible, in particular the ground and via configurations.
Gerber files of RFMD PCBA designs can be provided upon request. The supply voltage lines should present an RF short to the
FEM by using bypass capacitors on the V
CC
traces. To simplify bias conditions, the RFFM4202 requires a single positive supply
voltage (V
CC
), a positive current control bias (V
REG
) supply or high impedance enable, and a positive supply for switch control.
The built-in Power Detector of the RFFM4202 can be used as power monitor in the system. All inputs and outputs are internally
matched to 50.
Transmit Path
The RFFM4202 has a typical gain of 35dB from 2.4GHz to 2.5GHz, and delivers>27dBm typical output power in 11n HT20
MCS7 and>27.5dBm typical in 11g 54Mbps with an EVM<3%. The RFFM4202 requires a single positive of 5.0V to operate at
full specifications. The VREG pin requires a regulated supply at 2.85V to maintain nominal bias current.
Out of Band Rejection
The RFFM4202 contains a low pass filter (LPF) to attenuate the 2nd Harmonics to -40dBm/MHz (typical). Depending upon the
end-user's application, additional filters may be needed to meet the out of band rejection requirements of the system. For the
system to meet FCC' s spec, a simple LC can be used between FEM and Antenna, for impedance matching and extra Harmon-
ics attenuation to meet spec.
Receive Path
The Rx path has a 50 single-ended port. The Receive port return loss is 9.6dB minimum. In this mode, the FEM has an inser-
tion loss of 0.8dB and 30dB (typical) isolation to Tx port.
RFFM4202 Biasing Instructions to the Eval board:
802.11b/g/n Transmit:
1. Connect the FEM to a signal generator at the input and a spectrum analyzer at the output. Set the Pin at signal generator is
at -20dBm.
2. Bias V
CC
to 5.0V first with V
REG
=0.0V. If available, enable the current limiting function of the power supply to 1100mA.
3. Refer to switch operational truth table to set the control lines at the proper levels for WiFi Tx. It is recommended to maintain
at least 2.85V on VTx during Tx mode. A lower VTx voltage will enable the switch in Tx mode, but 2.85V is needed to ensure
that the switch stays in Tx mode during high power peaks. Using a VTx voltage less than 2.85V in Tx mode could result in
abnormal operation or device damage.
4. Turn on V
REG
to 2.85V (typ).
5. On V
REG
(of evaluation board), a regulated supply is recommended. Be extremely careful not to exceed 3.0V on the V
REG
pin
or the part may exceed device current limits.
6. Turn on P
DOWN
to 2.85V (typ). P
DOWN
pin can be tied to V
REG
supply. NOTE: It is important to adjust the V
CC
voltage source
so that +5V is measured at the board; and the +2.85V of V
REG
is measured at the board. The high collector currents will
drop the collector voltage significantly if long leads are used. Adjust the bias voltage to compensate.
7. Turn on RF of signal generator and gradually increase power level to the rated power. CAUTION: If the input signal exceeds
the maximum rated power, the RFFM4202 Evaluation Board can be permanently damaged.
8. To turn off FEM, turn off RF power of signal generator; then P
DOWN
, V
REG
and V
CC
.
802.11b/g/n Receive
• To receive WiFi set the switch control lines per the truth table.
DS120427
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or customerservice@rfmd.com.
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