RF5345
RF5345
2.4GHz TO 2.5GHz, 802.11b/g/n WiFi FRONT
END MODULE
Features

C_RX
C_TX
BT
13
12 C_BT
LNA_BIAS 1
Integrated 2.4GHz to 2.5GHz
b/g/n Amplifier LNA, SP3T
Switch, and Power Detector
Coupler
Single Supply Voltage 3.0V to
4.8V
POUT =17dBm, 11g, OFDM at
<3.3% EVM, 20dBm 11b
Meeting 11b Spectral Mask
Integrated Architecture and
Logic for WiFi and Bluetooth®
Receive Coexistence
Low Height Package, Suited for
SiP and CoB Designs
Applications

Cellular handsets

Mobile devices

Tablets

Consumer electronics

Gaming

Netbooks/Notebooks

TV/monitors/video

SmartEnergy
RX_OUT 2
11 ANT
TX_IN 3
10 GND
VREG 4
9
5
6
7
8
NC

14
VCC_1

15
VCC_B

16
PDETECT

C_Shared_RX
Package Style: QFN, 16-pin, 3.0mmx3.0mmx0.5mm
VCC_2
Functional Block Diagram
Product Description
The RF5345 provides a complete integrated solution in a single Front End Module (FEM) for
WiFi 802.11b/g/n and Bluetooth® systems. The ultra small form factor and integrated matching greatly reduces the number of external components and layout area in the customer application. This simplifies the total Front End solution by reducing the bill of materials, system
footprint, and manufacturability cost. The RF5345 integrates a 2.4GHz Power Amplifier (PA),
Low Noise Amplifier (LNA) with bypass mode, power detector coupler for improved accuracy, a
2170MHz notch filter for coexistence with cellular radios, and additional filters for harmonic
rejection. The RF5345 is capable of receiving WiFi and Bluetooth® simultaneously.
The device is provided in a 3.0mmx3.0mmx0.5mm, 16-pin package. This module meets or
exceeds the RF Front End needs of IEEE 802.11b/g/n WiFi RF systems.
Ordering Information
RF5345
RF5345SR
RF5345TR7
RF5345PCK-410
Standard 25 piece bag
Standard 100 piece reel
Standard 2500 piece reel
Fully Assembled Evaluation Kit
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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RF5345
Absolute Maximum Ratings
Parameter
DC Supply Voltage
DC Supply Current
Rating
Unit
5.0
V
240
mA
Operating Temperature Range
(Full Spec Compliant)
-10 to +75
°C
Extreme Operating Temperature
(Derated Performance)
-40 to -10
°C
+75 to +85
°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 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).
Storage Temperature
Maximum TX Input Power for
11b/11g/11n (No Damage)
Solder Reflow Temperature
Moisture Sensitivity
-40 to +150
°C
+5
dBm
260
°C
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
Parameter
Min.
Specification
Typ.
Max.
Unit
Condition
2.4GHz Transmit Parameters
Compliance
IEEE802.11b, IEEE802.11g,
FCC CFG 15.247,.205,.209, EN and JDEC
Operating Conditions
VCC =3.0V to 4.8V, VREG =2.75V to 3.0V, Switch Control
voltage=2.7V to 4.8V,
Temp=-10°C to +75°C, Freq=2.4GHz to 2.5GHz,
pulsed at 1% to 99% duty cycle, unless otherwise noted
Frequency
2.4
2.5
GHz
Output Power
11g
15.5
17
dBm
Measured with standard IEEE 802.11g waveform,
OFDM, 54Mbps, 64QAM meeting EVM requirements
11b
18.5
20
dBm
Measured with standard IEEE 802.11b waveform,
1Mbps, CCK, meeting ACP requirements
EVM*
3.3
4.0
%
At rated output power into 50 output (Dynamic and
Non-Dynamic)
ACP1
-36
-33
dBc
At rated output power
ACP2
-56
-52
dBc
At rated output power
Adjacent Channel Power
Gain
23
25
dB
Gain Variation
VCC (average)
-0.5
0.5
dB/V
Frequency
-0.5
+0.5
dB
dBm
In-band frequency slope
Power Detect
Power Range
0
23
Voltage Range
0.2
2.0
Input Resistance
10
Input Capacitance
V
k
5
pF
+1
dB
PDETECT Accuracy
-1
>10dBm
25
mV/dB
0<POUT <10dBm
8
mV/dB
POUT =17dBm
Sensitivity
*The EVM specification is obtained with a signal generator that has an EVM level <0.7%.
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DS120215
RF5345
Parameter
Min.
Specification
Typ.
Max.
Unit
Condition
2.4GHz Transmit Parameters,
cont’d
Current Consumption
150
250
mA
RFPOUT =17dBm, 54Mbps IEEE802.11g
200
250
mA
RFPOUT =20dBm, 1Mbps IEEE802.11b
Idle
110
250
mA
VCC =3.3V, VREG =2.8V, and RF=OFF
IREG
3
5
mA
VREG >2.75V
Leakage
2
10
A
VCC is “ON”, VREG <0.2V
V
ICC
Power Supply
3.0
3.3
4.8
VREG
2.75
2.8
3.0
Input/Output Impedance
V
For “PA” in “OFF” state: VREG <0.2V

50
Ruggedness
Output VSWR
10:1
No damage conditions: max operating voltage, max
input power, max temperature
5:1
PA must be stable (no spurs above -43dBm) from 0 to
P1dB, All phase angles, no spurious or oscillations.
Stability
Output VSWR
Out of Band Emissions
PA must be stable (no spurs above -43dBm) from 0 to
P1dB, All phase angles, no spurious or oscillations.
2310MHz to 2390MHz and
2483.5MHz to 2500MHz (see
note 4)
-43
dBm/MHz POUT =15dBm for 11g, 54Mbps OFDM
POUT =18dBm for 11b, 1Mbps CCK
Thermal Resistance
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,
DCC=100%, T=85°C
Harmonics
RBW=1MHz, VBW=100kHz. Measured at 1Mbps.
Second
-38
dBm/MHz 4.80GHz to 5.00GHz, POUT =18.5dBm using 1Mbps
CCK signal
Third
-36
dBm/MHz 7.20GHz to 7.50GHz, POUT =18.5dBm using 1Mbps CCK
signal
Turn-On/Off Time
0.5
1.0
S
Antenna Port Impedance (note 2)
Output stable to within 90% of final gain
This pin is internally matched for a 50W load and it is a
DC short to ground. See functional block diagram for
more details.
Input
50

Receive
Output
50

Transmit
Switch Control Voltage
Low
High
0
2.7
0.2
V
VCC
V
VHI max can go up to 4.8V or the voltage supply whichever is lower
Per control line (except C_RX)
10
A
Switch RX Current (C_RX)
200
uA
Switch Control Speed
100
nsec
Switch Control Current
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RF5345
Parameter
Min.
Specification
Typ.
Max.
Unit
Condition
2.4GHz Transmit Parameters,
cont’d
ESD
EIA/JESD22-114A, EIA/JESD22-115A
Human Body Model
Change Device Model (CDM)
500
V
RF pins
750
V
DC pins
500
V
All pins
2.4GHz Receive Parameters
Frequency
2.4
Receive Gain
Shared Mode
2.5
10.5
dB
WiFi RX only mode
6
8
dB
Simultaneous WiFi and BT Receive Mode (unused port
terminated in 50)
WiFi RX mode including switch
Noise Figure
2.8
Passband Ripple
-0.5
Bypass WiFi Rx Insertion Loss
Output Return Loss
GHz
9
3.6
dB
0.5
dB
7
dB
7
dB
WiFi RX mode
7
dB
WiFi and BT RX Shared mode
Output Impedance

No external matching
3.3
V
Applied at pin 1 (same as LNA_Bias)
6
8
mA
3.0
3.3
V
Enables the LNA
5
uA
Measured from LNA_Bias (pin 1)
2.5
GHz
2.0
dB
SP3T switch, all unused ports terminated into their nominal impedance. Bluetooth® mode only
+0.2
dB
WiFi RX and BT RX modes
50
LNA VDD Voltage
2.7
3.0
2.7
LNA VDD Current Consumption
LNA_Bias Voltage
LNA Leakage
Measured from LNA_Bias (pin 1)
Bluetooth® Parameters
Frequency
2.4
Insertion Loss
1.5
Passband Ripple
-0.2
Output Return Loss
10
dB
BT only mode
Output Return Loss (Shared Mode)
10

Simultaneous WiFi and BT Receive Mode

No external matching
A
Switch leakage current
Output Impedance
50
Current Consumption
10
*The EVM specification is obtained with a signal generator that has an EVM level
<0.7%.
Isolation Table
Parameter
Min.
Typ.
Max.
Unit
WiFi RX to BT RX/TX
17
dB
WiFi TX to BT RX/TX
17
dB
WiFi RX to WiFi TX
17
dB
Note: The output power for channels 1 & 11 may be reduced to meet FCC restricted band
requirements.
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DS120215
RF5345
Pin
1
2
3
4
Function
LNA BIAS
RX OUT
TX IN
VREG
5
6
7
8
9
10
11
PDETECT
VCC B
VCC 1
N/C
VCC 2
GND
ANT
12
C BT
13
14
15
16
BT
C TX
C RX
C SHARED
RX
DS120215
Description
Voltage supply for the LNA. Without LNA Bias “on”, the LNA will be switched into Bypass Mode.
Receive port for 802.11b/g/n band. Internally matched to 50. DC block provided.
RF input for the 802.11b/g/n PA. Input is matched to 50 and DC block is provided.
Regulated voltage for the PA bias control circuit. An external bypass capacitor may be needed on the VREG line for decoupling purposes.
Power detector voltage for TX operation. PDET voltage varies with output power. May need external decoupling.
Supply voltage for the bias circuit of the PA. Add an external 56pF bypass capacitor for low frequency decoupling.
Supply voltage for the first stage of the PA. Add an external 1nF 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.
Antenna port. This pin is internally matched for a 50 load and it is a DC short to ground. See functional block diagram
for more details.
Bluetooth® Mode. BT will always assert this pin when transmitting, or when receiving in BT-only mode. See truth
table for proper settings.
Bluetooth® RF Port.
Transmit Mode. See truth table for proper settings.
Receive Mode. See truth table for proper settings.
Shared mode operation between WiFi receive and Bluetooth® receive. Switch acts as a 3dB splitter. See truth
table for proper settings.
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RF5345
RF5345 Biasing Instructions:
• 802.11b/g/n Transmit
• Connect the FEM to a signal generator at the input and a spectrum analyzer at the output.
• Bias VCC to 3.3V 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 2.8V (typ.). VREG controls the current drawn by the 802.11b/g/n power amplifier and the current should
quickly rise to ~110mA±20mA for a typical part but it varies based on the output power desired. Be extremely careful not to
exceed 3.4V on the VREG pin or the part may exceed device current limits.
•
802.11 b/g/n 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
FEM Pin # -->
CASE
MODE
1
WiFi_TX
14
C TX
High
15
16
C RX C SHARED RX
Low
X
12
C BT
1
LNA
Bias
Low
**High or
Low
BT
WiFi RX WiFi TX
RADIO RADIO RADIO
OFF
OFF
ON
2
WiFi_RX
Low
High
*High or Low
Low
High
OFF
ON
OFF
3
WiFi_RX (bypassed)
Low
High
*High or Low
Low
Low
OFF
ON
OFF
4
BT_TX
Low
Low
Low
High
Low
ON
OFF
OFF
5
BT_RX
Low
Low
Low
High
Low
ON
OFF
OFF
6
WiFi_RX + BT_RX (Shared)
Low
High
High
Low
High
ON
ON
OFF
7
WiFi_RX + BT_RX (Shared
Bypassed)
Low
High
High
Low
Low
ON
ON
OFF
*Note: It is recommended that shared mode C_BTB (pin-16) is set to High and the BT radio off for best performance.
**Note: Setting LNA_Bias to “low” enables the LNA bypass switch. Therefore, if LNA_Bias is set to “high” during Transmit
mode, TX to RX isolation improves. This is an optional setting if additional TX to RX isolation is required for the system.
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DS120215
RF5345
Package Drawing
3.000 ± 0.1
PIN 1 INDICATOR
1.900
0.238
0.25
3.000 ± 0.1
0.500
1.900
0.550
0.300
0.062
0.230
0.450 ± 0.05
0.152±.05
0.030±.05
1
NOTES:
Shaded Area is Pin 1 Indicator
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RF5345
RF5345 PCB Footprint and Stencil Recommendations
Thermal vias for center slug “B” should be incorporated into the PCB design. The number and size of thermal vias will depend
on the application, the power dissipation, and the electrical requirements. Example of the number and size of vias can be
found on the RFMD evaluation board layout.
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RF5345
Evaluation Board Schematic
C_RX
C_TX
LNA_Bias
C1
0.1 F
J3
RX_OUT
J1
TX_IN
VREG
J3
BT
C_Shared_RX
L1
0.8 nH
50  strip
50  strip
R1
0
16
15
14
P1
13
1
12
2
11
17
GND
3
10
4
9
5
6
7
VCC_B2
8
N/C
VCC_12
C_BT
50  strip
VCC_22
L2
3.0 nH
C71
1 F
C4
330 pF
J2
ANT
L3
1.8 nH
C81
0.1 F
C6
DNP
PDETECT
1
VREG
2
GND
3
PDETECT
4
VCC
P2
1
GND
2
LNA Bias
3
C_Shared_RX
4
C_RX
5
C_TX
6
C_BTR
PA VCC
Note 1: Capacitors C7, and C8 are critical components to maintain linear output power and proper supply decoupling
Note 2: VCC_B, VCC1 and VCC2 may be tied together to the voltage supply
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RF5345
RF5345 Transmit Performance
29
12
27
12
27
25
10
25
23
8
EVM (%)
10
8
EVM ( - 10C )
EVM ( + 25C )
6
21
EVM (%)
14
GAIN (dB)
29
23
EVM (2.4GHz)
EVM (2.45GHz)
6
GAIN (2.4GHz)
GAIN ( - 10C )
4
21
EVM (2.5GHz)
EVM ( + 75C )
GAIN (dB)
RF5345 EVM and GAIN vs. FREQUENCY and POWER
(VCC=3.3v, Vreg=2.8v, 64QAM 54Mbps, 10% Duty Cycle, Temp=25C)
RF5345 EVM and GAIN vs. TEMPERATURE and POWER
(VCC=3.3v, Vreg=2.8v, 64QAM 54Mbps, FREQ=2.45GHz, 10% Duty Cycle)
14
GAIN (2.45GHz)
4
19
GAIN ( + 25C )
19
GAIN (2.5GHz)
GAIN (+75C)
2
0
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
17
2
15
0
17
15
0
21
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
OUPUT POWER (dBm)
OUPUT POWER (dBm)
RF5345 ICC vs. TEMPERATURE and POWER
(VCC=3.3v, Vreg=2.8v, 64QAM 54Mbps, Freq=2450MHz, 10% Duty Cycle)
RF5345 EVM and GAIN vs. SUPPLY VOLTAGE and POWER
(Vreg=2.8v, 64QAM 54Mbps, FREQ=2.45GHz, 10% Duty Cycle, Temp=25C)
14
29
12
27
10
25
190
170
EVM (3.3V)
6
21
EVM (4.8V)
TEMP = +25C
ICC (mA)
23
EVM (3.0V)
GAIN (dB)
EVM (%)
TEMP = -10C
8
TEMP = +75C
130
GAIN (3.0V)
GAIN (3.3V)
4
150
19
GAIN (4.8V)
110
2
17
0
90
15
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
0
21
1
2
3
4
5
6
7
8
10
11
12
13
14
15
16
17
18
19
20
21
18
19
20
21
RF5345 ICC vs. SUPPLY VOLTAGE and POWER
(Vreg=2.8v, 64QAM 54Mbps, FREQ=2.45GHz, TEMP=25C, 10% Duty Cycle)
RF5345 ICC vs. FREQUENCY and POWER
(VCC=3.3v, Vreg=2.8v, 64QAM 54Mbps, TEMP=25C, 10% Duty Cycle)
190
190
170
170
VCC = 3.0V
FREQ = 2.4GHz
VCC = 3.3V
ICC (mA)
FREQ = 2.45GHz
ICC (mA)
9
OUPUT POWER (dBm)
OUPUT POWER (dBm)
150
FREQ = 2.5GHz
150
VCC = 4.8V
130
130
110
110
90
90
0
1
2
3
4
5
6
7
8
9
10
11
12
OUPUT POWER (dBm)
10 of 20
13
14
15
16
17
18
19
20
21
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
OUPUT POWER (dBm)
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support, contact RFMD at (+1) 336-678-5570 or [email protected]
DS120215
RF5345
RF5345 POWER DETECTOR VOLTAGE vs. TEMPERATURE and POWER
(VCC=3.3v, Vreg=2.8v, 64QAM 54Mbps, Freq=2450MHz, 10% Duty Cycle)
RF5345 POWER DETECTOR VOLTAGE vs. FREQUENCY and POWER
(VCC=3.3v, Vreg=2.8v, 64QAM 54Mbps, TEMP=25C, 10% Duty Cycle)
1.800
1.800
1.600
1.600
1.400
TEMP = -10C
1.200
PDETECT VOLTAGE (V)
PDETECT VOLTAGE (V)
1.400
TEMP = +25C
1.000
TEMP = +75C
0.800
0.600
FREQ = 2.4GHz
1.200
FREQ = 2.45GHz
1.000
FREQ = 2.5GHz
0.800
0.600
0.400
0.400
0.200
0.200
0.000
0.000
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
OUPUT POWER (dBm)
OUPUT POWER (dBm)
RF5345 POWER DETECTOR VOLTAGE vs. SUPPLY VOLTAGE and POWER
(Vreg=2.8v, 64QAM 54Mbps, FREQ=2.45GHz, TEMP=25C, 10% Duty Cycle)
1.8
1.6
PDETECT VOLTAGE (V)
1.4
VCC = 3.0V
1.2
VCC = 3.3V
1
VCC = 4.8V
0.8
0.6
0.4
0.2
0
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
OUPUT POWER (dBm)
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RF5345
RF5345 Receive Performance
RF5345 RECEIVE NOISE FIGURE vs. TEMPERATURE vs. FREQUENCY
(SHARED MODE, VCC=3.3v, LNA_EN=2.7v, CONTROL VOLTAGES=2.7v)
RF5345 RECEIVE S-PARAMETERS vs. TEMPERATURE vs. FREQUENCY
(SHARED MODE, VCC=3.3v, LNA_EN=2.7v, CONTROL VOLTAGES=2.7v)
6
15
10
5
5
0
NF (dB)
MAGNITUDE (dB)
4
-5
-10
-15
S11: -10C
S21: -10C
-20
S22: -10C
S11: 25C
-25
S21: 25C
S22: 25C
2
1
NF: 25C
S11: 75C
-30
-35
2300
3
NF: -10C
S21: 75C
S22: 75C
2350
2400
2450
2500
2550
2600
FREQUENCY (MHz)
0
2400
NF: 75C
2450
2500
FREQUENCY (MHz)
RF5345 Input IP3 vs. Temperature vs. Frequency
(Shared Mode, LNA_Bias=3.3v)
14
12
Input IP3 (dB)
10
8
6
4
Temp = - 10C
2
Temp = + 25C
Temp = + 75C
0
2400
2450
2500
Frequency (MHz)
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RF5345
RF5345 Theory of Operation
The RF5345 FEM can be applied in many portable applications such as handsets, digital cameras, personal media players,
and more. This highly integrated module can be connected directly to the battery without additional voltage regulators.
WiFi Transmit Mode
The RF5345 requires a single positive supply (VCC), a positive supply for switch controls, and a regulated supply for the Vreg
pin to maintain nominal bias current. If desired, the switch control voltages may be tied directly to VCC as long as the maximum
operating voltage does not exceed 4.8V. The RF5345 transmit path has a typical gain of 25dB from 2.4GHz to 2.5GHz, and
delivers 17dBm typical output power under 54Mbps OFDM modulation and 20dBm under 1Mbps 11b modulation.
While in transmit mode, the active components are the Power Amplifier (PA) and the TX branch of the SP3T switch. Refer to figures 1 and 2 below for proper settings.
Vreg Supply
Voltage
Dual Channel
TX_In Port
Coupler
ANT Port
VCC
DUT
V_Control
Sig Gen
P-Sensor
P-Sensor
P-Meter
Spectrum
Analyzer
Coupler
Multimeter to
sense Pdetect
Main Supply
Voltage
Dual Channel
Figure 1. WiFi Transmit Path Test Setup
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RF5345
Case
Mode
C_TX
C_RX
C_Shared_RX
C_BT
LNA_Bias
1
WiFi TX
HIGH
LOW*
X
LOW*
LOW or HIGH**
*These controls must be set to a logic low or grounded. Do not leave floating.
C_TX
BT
16
C_RX
C_Shared_RX
**LNA_Bias “HIGH” disables the bypass switch and improves TX-RX isolation.
15
14
13
ANT
LNA_Bias
1
12
RX_OUT
2
11
TX_IN
3
10
Vreg
4
9
5
6
7
8
C_BT
GND
VCC_2
Pdetect
VCC_b
VCC_1
NC
Figure 2. WiFi Transmit Control Settings and Signal Flow Diagram
Once the test setup and DUT have been configured as indicated in figure 1 and 2, the off branches of the SP3T switch (C_RX,
and C_BT) must be set to a logic state “low” (0.2V max) or grounded. In the event that one of these branches are left floating
or in logic state “high” the performance of the PA will degrade significantly. Likewise, unused RF Ports must be terminated in
50 to simulate actual system conditions and prevent RF signals from coupling back to the PA.
The following sequence for turning the PA “ON” is recommended:
1. Bias VCC to 3.3V (pins 6, 7, and 9) while Vreg and C_TX (pins 4 and 14) are at 0.0v and RF is “OFF.”
2. Set C_TX “high”. This properly terminates the PA berfore turning Vreg “ON.”
3. Turn Vreg (pin 4) “ON” to 2.8V. This pin controls the current drawn by the PA and it should quickly reach the quiescent current approximately 110mA±20mA. Care must be exercised not to exceed 3.4V on this pin or the PA may be damaged.
4. Turn RF “ON.”
Note that setting LNA_Bias “low” enables the LNA bypass switch. Therefore, if LNA_Bias is set “high” during Transmit mode, TX
to RX isolation improves. This is an optional setting if additional TX to RX isolation is required for the system.
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RF5345
WiFi Receive Mode
Within the frequency band of operation, 2.4GHz to 2.5GHz, the RF5345 receive path has a typical gain of 10.5dB and a NF of
2.8dB with only 6mA of current. In WiFi Receive Mode, only the RX branch of the SP3T and the LNA are active. See figures 3
and 4 for a simplified test setup and signal flow diagram with corresponding control settings.
Optional Equipment
P-Sensor
Coupler
Coupler
ANT Port
Spectrum
Analyzer
RX_Out Port
LNA_Bias
DUT
V_Control
Sig Gen
P-Sensor
P-Meter
Main Supply
Voltage
Dual Channel
Figure 3. WiFi Receive Test Setup
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RF5345
Case
Mode
C_TX
C_RX
C_Shared_RX
C_BT
LNA_Bias
1
WiFi RX
LOW*
HIGH
LOW
LOW*
HIGH
15
14
BT
C_RX
16
C_TX
C_Shared_RX
*These controls must be set to a logic low or grounded. Do not leave floating.
13
ANT
LNA_Bias
1
12
RX_OUT
2
11
TX_IN
3
10
Vreg
4
9
5
6
7
8
C_BT
GND
VCC_2
Pdetect
VCC_b
VCC_1
NC
Figure 4. WiFi Receive Control Settings and Signal Flow Diagram
The supply voltage for the LNA (VDD) is provided through the LNA_Bias (pin 1) which simultaneously turns the LNA bypass
switch “OFF” and sets the device in High Gain mode. As in the case of the WiFi transmit mode, all unused control lines and RF
Ports must be properly terminated. Therefore, C_TX and C_BT are set “low” as well as the BT and TX_In RF ports terminated in
50.
Due to the output impedance mismatch which results when C_Shared_RX (pin 16) is off, it is recommended to operate WiFi RX
Mode with pin 16 “high” and turning the Bluetooth radio off (see SHARED RX MODE control settings).
WiFi Bypass Mode
During Bypass Mode, the LNA_Bias (pin 1) is at 0V which enables the Bypass switch and sets the device in low gain. Due to the
additional switches involved in this path, the typical insertion loss is about 4.5dB within the frequency band 2.4GHz to
2.5GHz. See figure 5 below for signal flow and control settings.
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RF5345
Case
Mode
C_TX
C_RX
C_Shared_RX
C_BT
LNA_Bias
3
WiFi Bypass
LOW*
HIGH
LOW
LOW*
LOW
15
14
BT
C_RX
16
C_TX
C_Shared_RX
*These controls must be set to a logic low or grounded. Do not leave floating.
13
ANT
LNA_Bias
1
12
RX_OUT
2
11
TX_IN
3
10
Vreg
4
9
5
6
7
8
C_BT
GND
VCC_2
Pdetect
VCC_b
VCC_1
NC
Figure 5. WiFi Bypass Control Settings and Signal Flow Diagram
To prevent additional losses during Bypass mode, ensure that the off branches of the SP3T switch have the controls C_TX and
C_BT set “low” or grounded. For optimum performance, it is also recommended to terminate the RF ports BT and TX_In with
50.
BLUETOOTH TX/RX Mode
For Bluetooth transmit and receive operation, the only active component is the SP3T switch. Typical insertion loss within the
operating frequency is only 1.5dB. Figure 6 illustrates the signal flow and control settings.
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RF5345
Case
Mode
C_TX
C_RX
C_Shared_RX
C_BT
LNA_Bias
4 and 5
Bluetooth TX/RX
LOW*
LOW*
LOW
HIGH
LOW
15
14
BT
C_RX
16
C_TX
C_Shared_RX
*These controls must be set to a logic low or grounded. Do not leave floating.
13
ANT
LNA_Bias
1
12
RX_OUT
2
11
TX_IN
3
10
Vreg
4
9
5
6
7
8
C_BT
GND
VCC_2
Pdetect
VCC_b
VCC_1
NC
Figure 6. BLUETOOTH TX/RX Control Settings and Signal Flow Diagram
As indicated in the table of fig-6, to optimize performance, controls C_TX and C_RX for the off branches of the SP3T should be
set “low” or grounded. Likewise, it is recommended to terminate the RX and Tx RF Ports in 50.
SHARED MODE (Simultaneous WiFi and BT Receive Operation)
The RF5345 Receive and Bluetooth circuits were specifically designed to address issues of simultaneous WiFi and Bluetooth
receive operation. Both signals can be received at the same time through the shared mode switch (setting pin 16 “high”).
Either radio, BT or WiFi, can be turned off to receive only one signal at a time. However, the C_SHARED_RX pin should remain
“high” to maintain good return loss at the port in operation. During shared mode, the active components are the RX branch of
the SP3T, the LNA, and the shared mode switch. Refer to figure 7 below for control settings and signal flow.
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RF5345
Case
Mode
C_TX
C_RX
C_Shared_RX
C_BT
LNA_Bias
6
Shared WiFi/BT RX
LOW*
HIGH
HIGH
LOW*
HIGH
16
15
14
BT
C_TX
C_RX
C_Shared_RX
*These controls must be set to a logic low or grounded. Do not leave floating.
13
ANT
LNA_Bias
1
12
RX_OUT
2
11
TX_IN
3
10
Vreg
4
9
7
8
VCC_1
NC
Pdetect
6
VCC_b
5
C_BT
GND
VCC_2
Figure 7. Shared Mode Control Settings and Signal Flow
During share mode, the impedance of the port in operation is consistent even if the other radio is turn off. By having one of the
radios off, that port presents a high impedance to the other port allowing performance optimization of the port in operation.
The simultaneous (at each BT and RX ports) typical gain is 8dB with a total current consumption of about 6mA.
Once again, the supply voltage for the LNA (Vdd) is provided through the LNA_Bias (pin 1) which simultaneously turns the LNA
bypass switch “OFF” and sets the device in High Gain mode. All unused control lines and RF Ports must be properly terminated.
SHARED BYPASSED MODE
This operating mode is similar to the normal Shared Mode. The main difference is that the LNA bypass switch is enabled by
applying 0v to the LNA_Bias pin. See figure 8 below.
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RF5345
Case
Mode
C_TX
C_RX
C_Shared_RX
C_BT
LNA_Bias
7
SHARED BYPASS
WiFi/BT Receive
LOW*
HIGH
HIGH
LOW*
LOW
16
15
14
BT
C_TX
C_RX
C_Shared_RX
*These controls must be set to a logic low or grounded. Do not leave floating.
13
ANT
LNA_Bias
1
12
RX_OUT
2
11
TX_IN
3
10
Vreg
4
9
7
8
VCC_1
NC
Pdetect
6
VCC_b
5
C_BT
GND
VCC_2
Figure 8. Shared Bypass Mode Control Settings and Signal Flow
PCB Layout
The integrated harmonic filtering and matching of the RF5345 facilitates deployment on the customer’s board by offering 50
interface at all RF ports. For best results, the board layout from the evaluation board should be copied as closely as possible in
particular the ground configuration underneath the FEM and around the RF traces and decoupling capacitors. There is an indicator pin labeled P1 ID that should be left as a no-connect on the PCB. This pin is directly connected to the ground pad of the
IC (refer to the package drawing on page 7). For best performance it is recommended that voltage and RF lines do not cross
under this pin. Gerber files of RFMD evaluation board and PCB landing pads recommendations can be provided upon request.
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DS120215
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