RF5725
RF5725
2.4GHz TO 2.5GHz SINGLE-BAND
FRONT END MODULE
Features








3
VREG
4
Cellular handsets
Mobile devices
Tablets
Consumer electronics
Gaming
Netbooks/Notebooks
TV/monitors/video
SmartEnergy
C RX
C TX
BT
12 C BT
11 ANT
SP3T
2F0 Filter
POUT =17dBm, 11g, OFDM at
<3% EVM, 21dBm 11b Meeting 11b Spectral Mask
Low Height Package, Suited
for SiP and CoB Designs
Applications

TX IN
13
10 GND
9
5
6
7
8
N/C

2
14
VCC

RX OUT
15
VCC

Single Module Radio Front
End
Single Supply Voltage 3.0V to
5V
Integrated 2.4GHz to 2.5GHz
b/g Amplifier LNA, TX/RX
Switch, PDETECT Coupler
1
16
PDETECT

LNA VCC
LNA EN
Package Style: QFN, 16-pin, 3mmx3mmx0.5mm
VCC
Functional Block Diagram
Product Description
The RF5725 is a single-chip integrated front-end module (FEM) for high
performance WiFi applications in the 2.4GHz to 2.5GHz ISM band. This
FEM greatly reduces the number of external components, minimizing footprint and assembly cost of the overall 802.11b/g solution. The RF5725
has an integrated b/g power amplifier, LNA, a Coupler Power detector, and
TX filtering. It also is capable of switching between WiFi RX, WiFi TX, and
BTH RX/TX operations. This device is manufactured using GaAs HBT and
pHEMT processes on a 3mmx3mmx0.5mm 16-pin QFN package. This
module meets or exceeds the RF front-end needs of 802.11b/g WiFi RF
systems.
Ordering Information
RF5725
RF5725SR
RF5725TR7
RF5725PCK-410
Standard 25 piece bag
Standard 100 piece reel
Standard 2500 piece reel
Fully assembled evaluation board tuned for 2.4GHz to
2.5GHz and 5 loose sample pieces
Optimum Technology Matching® Applied
GaAs HBT
GaAs MESFET
InGaP HBT

SiGe BiCMOS
Si BiCMOS
SiGe HBT
GaAs pHEMT
GaN HEMT
Si CMOS
Si BJT
RF MICRO DEVICES®, RFMD®, Optimum Technology Matching®, Enabling Wireless Connectivity™, PowerStar®, POLARIS™ TOTAL RADIO™ and UltimateBlue™ are trademarks of RFMD, LLC. BLUETOOTH is a trademark 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.
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RF5725
Absolute Maximum Ratings
Parameter
DC Supply Voltage
DC Supply Current
Rating
Unit
5.0
V
240
mA
Full Specification Temp Range (Full
Spec. Compliant)
-10 to +70
°C
Extreme Operating
(Reduced Performance)
-40 to -10
+70 to +85
Storage Temperature
-40 to +150
°C
5
dBm
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 performance or functional operation of the device under Absolute Maximum Rating conditions is not implied.
RoHS status based on EUDirective2002/95/EC (at time of this document revision).
Maximum TX Input Power
for 11b/g (No Damage)
Moisture Sensitivity
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 application circuitry and specifications at any time without prior notice.
MSL2
Specification
Min.
Typ.
Max.
Parameter
Unit
Condition
2.4GHz Transmit Parameters
Compliance
IEEE802.11b, IEEE802.11g,
FCC CFG 15.247, .205, .209
Nominal Conditions
Specifications must be met across VCC, VREG, frequency,
process, and temperature, unless otherwise specified.
Frequency
2.4
2.5
GHz
Output Power
11g
16
11g
15
11b
20
11b
18
EVM*
dBm
OFDM 54Mbps, VCC =3.3 < 4.2V, T=10° to 75°C
dBm
Derated performance over Freq, Temp, and Process.
21
dBm
11Mbps, CCK, VCC=3.3 < 4.2V, T=10°C to +75°C.
19
dBm
Derated performance over Freq, Temp, and Process.
17
54Mbps OFDM VCC 3.6V, 50see Note 1, 5
3.0
4.0
%
ACP1
-38
-34
dBc
POUT(b)=21dBm, 1Mbps CCK, Note 4. Meeting 11b
spectral mask requirements with  3dB margin
ACP2
-56
-53
dBc
POUT(b) =21dBm, 1Mbps CCK, Note 4. Meeting 11b
spectral mask requirements with  3dB margin
Adjacent Channel Power
Gain
24
26
dB
Gain Variation
VCC
Frequency
-0.5
Voltage Detect
0.1
0.7
dB/V
+0.5
dB
2.4GHz to 2.5GHz
Power Detect
1.5
V
POUT =17dBm
1.0
V
Input Resistance
10
k
Input Capacitance
5
Bandwidth
800
PDETECT Accuracy
-1.5
1000
IEEE802.11g, 54Mbps 64QAM modulation
pF
kHz
+1.5
dB
POUT =17dBm
*The EVM specification is obtained with a signal generator that has an EVM level
<0.7%.
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RF5725
Parameter
Min.
Specification
Typ.
Max.
Unit
Condition
2.4GHz Transmit Parameters,
cont’d
Sensitivity
>10dBm
25
mV/dB
0<POUT <10dBm
8
mV/dB
Current Consumption
130
ICC
mA
Idle
95
IREG
3
Leakage
mA
5
mA
A
2
10
Power Supply
3.0
3.6
4.5
V
VREG
2.75
2.85
2.95
V
Input/Output Impedance
RFPOUT =17dBm, 54Mbps IEEE802.11g
RFPOUT =21dBm, 11Mbps IEEE802.11b
190
VCC =3.6V, VREG =2.85V, and RF=OFF

50
Ruggedness
No damage
Output VSWR
10:1
Maximum: operating voltage, input power, temperature
5:1
All phase angles, no spurious or oscillations.
Stability
Output VSWR
Out of Band Performance
S21 (DC to 960MHz)
0
dB
S21 (1570MHz to 1580MHz)
18
dB
S21 (1805MHz to 1990MHz)
20
dB
S21 (2110MHz to 2170MHz)
25
Thermal Resistance
dB
All other ports terminated in their nominal impedances
79.3
°C/W
VCC=3.3, VREG=2.9V, C_TX=3.3, C_RX=C_BT=GND,
POUT=17dBm, Modulation=On, Freq=2.45GHz,
DCC=100%, T=85°C
87.2
°C/W
VCC=4.8, VREG=3V, C_TX=3.3, C_RX=C_BT=GND,
POUT=17dBm, Modulation=On, Freq=2.45GHz,
DC=100%, T=85°C
4.80GHz to 5.00GHz
Harmonics
RBW=1MHz. Measured at 1Mbps.
Second
-35
-32
dBm
Third
-45
-42
dBm
0.5
1.0
S
Output stable to within 90% of final gain
Turn-On/Off Time
Antenna Port Impedance
7.20GHz to 7.50GHz
Antenna port is a DC short to ground
Input
50

Receive
Output
50

Transmit
Switch Control Voltage
Low
High
2.7
0
0.2
V
2.8
3.6
V
Switch Control Current
10
A
Switch Control Speed
100
nsec
ESD
DS120214
Per control line
All pins unless otherwise stated.
Human Body Model
1000
V
EIA/JESD22-114A
Charge Device Model
500
V
EIA/JESD22-C101C
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RF5725
Parameter
Min.
Specification
Typ.
Max.
Unit
Condition
2.4GHz Receive Parameters
Frequency
2.4
2.5
GHz
Receive Gain
10
13
16
dB
WiFi RX mode only
7
10
13
dB
WiFi RX and BT RX mode
2.1
dB
WiFi RX mode only
5.5
dB
WiFi RX and BT RX mode
Noise Figure
Passband Ripple
-1
Output Return Loss
Output Impedance
+1
dB
-9.6
dB
30
A

50
Current Consumption
LNA VCC
8
mA
LNA enable
2
mA
5
uA
No external matching
LNA ON
LNA OFF
BluetoothTM Parameters
Frequency
2.4
Insertion Loss
0.8
3.75
2.5
GHz
1.2
dB
SP3T switch, all unused ports terminated into their nominal impedance. BluetoothTM mode only
WiFi RX and BT RX mode
5.50
dB
+0.2
dB
Input/Output Power
8
dBm
Output Return Loss
-10
dB

No external matching
30
A
Switch leakage current
Passband Ripple
-0.2
Output Impedance
50
Current Consumption
*The EVM specification is obtained with a signal generator that has an EVM level
<0.7%.
Note 1. The PA module must operate with gated bias voltage input at 1% to 99% duty cycle.
Note 2. No external matching components. Antenna port is a DC short to GND.
Note 3. Values to be agreed upon characterization data review: current, gain, return loss, detector sensitivity, and output power.
Note 4. The output power for channels 1 and 13 may be reduced to meet FCC restricted band requirements.
Note 5: EVM at lower output power values will never exceed nominal operating power EVM. EVM should be monotonic from 0dBm to rated output power.
Isolation Table
Parameter
Min.
Typ.
Max.
Unit
WiFi RX to BT RX/TX
20
dB
WiFi TX to BT RX/TX
20
dB
WiFi RX to WiFi TX
20
dB
WiFi RX and BT RX Mode
9
dB
Switch Control Logic
Mode
C_RX
C_TX
C_BT
BluetoothTM
L
L
H
WiFi Tx
L
H
L
WiFi Rx
H
L
L
WiFi Rx/BT
H
L
H
*The FEM can simultaneously receive WiFi and BluetoothTM in the WiFi RX and BT RX Mode.
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RF5725
Pin
1
2
3
4
Function
LNA VCC
RX OUT
TX
VREG
5
PDETECT
6
7
8
9
10
11
12
13
14
15
16
VCC
VCC
N/C
VCC
GND
ANT
C_BT
BT
C_TX
C_RX
LNA_EN
Description
Voltage supply for the LNA (labeled VCC3 on evaluation board).
Receive port for 802.11b/g band. Internally matched to 50. DC block provided.
RF input for the 802.11b/g PA. Input is matched to 50 and DC block is provided.
Regulated voltage for the bias control circuit. An external bypass capacitor may be needed on the VREG line for
decoupling purposes.
Power detector voltage for TX section. PDET voltage varies with output power. May need external decoupling
capacitor for module stability. May need external circuitry to bring output voltage to desired level.
Supply voltage for the bias circuit of the PA.
Supply voltage for the first stage of the PA. Add an external 0.1uF capacitor for low frequency decoupling.
No connect.
Supply voltage for the second stage of the PA. Add an external 0.1uF capacitor for low frequency decoupling.
Ground.
Port matched to 50 and is a DC short to ground.
Switch control port. See truth table for proper level.
RF bidirectional port for BluetoothTM. Input is matched to 50 and DC block is provided.
Switch control port. See switch truth table for proper level.
Switch control port. See switch truth table for proper level.
LNA enable pin. This is an active high control. A bypass capacitor may be needed for supply noise decoupling.
Package Drawing
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RF5725
6 of 11
LNA_EN
C_RX
C_TX
BT
Pin Out
16
15
14
13
LNA VCC
1
12 C_BT
RX OUT
2
11 ANT
TX IN
3
10 GND
VREG
4
5
6
7
8
PDETECT
VCC
VCC
N/C
9
VCC
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RF5725
Evaluation Board Schematic
LNA
Vcc
C_RX
C_TX
J3
BT
LNA_EN
C1
0.1 F
U1
RF5725
L1
2.4 nH
J2
RX OUT
J1
TX IN
16
50  strip
50  strip
15
14
13
1
12
2
11
3
10
4
VREG
P1-1
R1
0
9
5
6
7
VBT
J4
ANT
50  strip
VCC2
L3
1.8 nH
8
N/C
C8
0.1 F
L2
3 nH
VCC1
C7
0.1 F
P1-3
P1-4
P1
1
VREG
2
GND
3
PDETECT
VCC
4
HDR_1X4
P2-6
P2
6
VBT
P2-5
5
VTX
P2-4
4
VRX
P2-3
3
LNA_EN
2
GND
1
VCC3 (LNA Vcc)
P2-1
HDR_1X6
C4
330 pF
PDETECT
VCC bias
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RF5725
Theory of Operation
The RF5725 FEM 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 solution. The RF5725 has an integrated b/g power amplifier, LNA, a Couple Power Detector, and TX filtering.
It is also capable of switching between WiFi RX, WiFi TX, and BTH RX/TX operations. The device is manufactured using GaAs
HBT and pHEMT processes on a 3mmx3mmx0.5mm 16-pin QFN package. The module meets or exceeds the RF front-end
needs of the 802.11b/g WiFi RF systems.
The RF5725 is a very easy part to implement, but care in circuit layout and component selection is always advisable when
designing circuits that operate at high frequencies. To reduce the design and optimization process on the customer application, 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 VCC traces. Please contact RFMD Sales or Application Engineering for additional data and guidance.
To simplify bias conditions, the FR5725 requires a single positive supply voltage (VCC), a positive current control bias (VREG)
supply, and a positive supply for switch control. The built in Coupler Power Detector of the FR5725 is very accurate and minimizes calibration time in the system. All inputs and outputs are internally matched to 50.
Transmit Path
The RF5725 has a typical gain of 28dB form 2.4GHz to 2.5GHz, and delivers 17dBm typical output power under 54Mbps
OFDM modulation and 21dBm under 1Mbps 11b modulation. The RF5725 requires a single positive of 3.3V to 4.2V to operate at full specifications. Current control optimization for the 802.11b/g band is provided through one bias control input pin
(VREG). The VREG pin requires a regulated supply to maintain nominal bias current.
Out of Band Rejection
The RF5725 contains basic filtering components to produce a bandpass response for the transmit path. Due to space constraints inside the module filtering is limited to a few resonant poles. Depending upon the end-user’s application, additional filters may be needed to meet the out of band rejection requirements of the system.
Receive Path
The 802.11b/g path has a 50 single-ended port with a nominal gain of 10dB in WiFi RX mode and 6dB in WiFi RX/BT mode.
The Receive port return loss is 9.6dB minimum. The RF5725 is designed so that the SP3T may act as a 3dB splitter when
placed in the WiFi RX and BT RX mode. In this mode, the FEM can receive Bluetooth™ and WiFi signals simultaneously with an
additional 3dB of loss.
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DS120214
RF5725
RF5275 Biasing Instructions:
• 802.11b/g Transmit:
• Connect the FEM to a signal generator at the input and a spectrum analyzer at the output.
• Bias VCC to 3.6V first with VREG =0.0V.
• Refer to switch operational truth table to set the control lines at the proper levels for WiFi TX.
• Turn on VREG to 2.85V (typ.). VREG controls the current drawn bu the 802.11b/g power amplifier and the current should
quickly rise to ~100mA ± 20mA for a typical part but it varies based on the output power desired. Be externally careful not
to exceed 3.4V on the VREG pin or the part may exceed device current limits.
• 802.11b/g Receive
• To receive WiFi set the switch control lines per the truth table below.
• Bluetooth™ Receive
• To receive Bluetooth™ set the switch control lines per the truth table below.
Switch Control Logic
Mode
C_RX
C_TX
C_BT
L
L
H
WiFi Tx
L
H
L
WiFi Rx
H
L
L
WiFi Rx/BT
H
L
H
Bluetooth
TM
*The FEM can simultaneously receive WiFi and BluetoothTM in the WiFi RX and BT RX Mode.
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RF5725
Evaluation Board Layout
Board Size 2.0” x 2.0”
Board Thickness 0.032”, Board Material FR-4, Multi-Layer
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RF5725
RF5725 Plots
Operang Current versus Output Power
VCC = 3.3V Vreg = 2.85V
Temperature = 25C
Gain versus Output Power
VCC = 3.3V Vreg = 2.85V
Temperature = 25C
Gain (dB)
35
30
2400 MHz
25
2450 MHz
20
2500 MHz
15
Operang Current (A)
40
10
0.21000
0.19000
0.17000
0.15000
0.13000
0.11000
0.09000
0.07000
0.05000
2450 MHz
2500 MHz
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
Output Power (dBm)
Output Power (dBm)
Power Detector versus Output Power
VCC = 3.3V Vreg = 2.85V
Temperature = 25C
EVM versus Output Power
VCC = 3.3V Vreg = 2.85V
Temperature = 25C
1.20000
8
7
0.80000
0.60000
6
2450 MHz
5
2500 MHz
0.40000
2400 MHz
4
2450 MHz
3
2500 MHz
2
0.20000
1
0.00000
DS120214
2400 MHz
EVM(%)
1.00000
Pdet (V)
2400 MHz
0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
Output Power (dBm)
Output Power (dBm)
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