RFFM3482Q Data Sheet

RFFM3482Q Data Sheet
RFFM3482Q
2.4GHz to 2.5GHz, Automotive WiFi
Front End Module
BT

RXBP
GND
ANT
11 RX SW
3
10 TX SW
9
5
VB
6
7
8
PDET
PAEN 4
Automotive WiFi
Diagnostic
Data
Infotainment
12 BTH SW
GND 2
Applications

13
PABC
Single Voltage Supply 3.3V to
4.2V
Integrated 2.5GHz b/g/n
Amplifier, Rx Balun and Tx/Rx
Switch and Directional Power
Detector
POUT = 17dBm, 11g, OFDM
at 2.4% EVM and POUT =
21.5dBm, Meeting 11b Mask

14
VB

15
Balun

16
TXB 1
Features

RXBN
Package Style: QFN, 16-pin, 3mm x 3mm x 0.45mm
VB
Functional Block Diagram
Product Description
The RFFM3842Q FEM is a single-chip integrated front end module (FEM)
for automotive WiFi. The FEM addresses the need for aggressive size
reduction for a typical 802.11b/g/n front end design and greatly reduces
the number of components outside of the core chipset. The front end
module has integrated b/g/n power amplifier, directional power detector,
Rx balun, and some Tx filtering. It is also capable of switching between
WiFi Rx, WiFi Tx and BTH RX/TX operations. The device is provided in a
3mm x 3mm x 0.45mm, 16-pin package. This module meets or exceeds
the RF front end needs of 802.11b/g/n WiFi RF systems.
Ordering Information
RFFM3482QTR13X Standard 1 piece
RFFM3482QSQ
Standard 25 piece bag
RFFM3482QSR
Standard 100 piece bag
RFFM3482QTR7
Standard 2500 piece reel
RFFM3482QPCK-41XFully Assembled Evaluation Board and 5 loose sample pieces
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. ©2012, RF Micro Devices, Inc.
DS20160920
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RFFM3482Q
Absolute Maximum Ratings
Parameter
DC Supply Voltage
Rating
Unit
5.6
VDC
Full Specification Temp Range (Full
Spec. Compliant)
-40 to +85
°C
Storage Temperature
-40 to +150
°C
Maximum Tx Input Power
for 11b (No Damage)
+10
dBm
Maximum Tx Input Power
for 11g (No Damage)
+10
dBm
Moisture Sensitivity
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.
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.
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.
MSL2
Nominal Operating Parameters
Bm
Specification
Min.
Typ.
Max.
Parameter
Unit
Condition
2.4GHz Transmit Parameters
Compliance
IEEE802.11b, IEEE802.11g,
FCC CFG 15.247, .205, .209
Nominal Conditions
VCC = 3.6V, PAEN = 1.8V pulsed at 1% to 100% duty
cycle, Temp = +25°C,
Freq = 2.4GHz to 2.5GHz, unless otherwise noted
Frequency
2.4
2.5
GHz
Output Power
11g
15
17
dBm
54Mbps, OFDM, 64QAM meeting EVM
requirement1
11b
19.5
21.5
dBm
Measured at 1Mbps meeting ACP1/ACP2 requirements
11n
13.5
dBm
MCS7, OFDM
16
EVM* 11g
2.4
3.5
EVM* 11n
%
RMS, mean, POUT(g) = 15dBm
RMS, mean, POUT(n) = 13.5dBm
2.2
2.8
%
ACP1
-36
-31
dBc
ACP2
-56
-51
dBc
33
38
dB
-3
+3
dB
Over temperature and voltage
-1.0
+1.0
dB
2.4GHz to 2.5GHz
Gain
Gain Variation
Frequency
26.5
POUT = 19.5dBm, IEEE802.11b, 11Mbps CCK,
1Mbps BPSK modulation
*The EVM specification is obtained with a signal generator that has an EVM level <0.7%.
1. With Vcc >3.0V to 3.3V there will be a 0.5dB degradation in 11g linear output power.
2. The Typical parameters are at nominal conditions. Min/Max parameters are over all conditions.
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DS20160920
RFFM3482Q
Specification
Min.
Typ.
Max.
Parameter
Unit
Condition
2.4GHz Transmit Parameters
(continued)
Power Detect
Voltage Detect
0
POUT = 16dBm
0.260
Input Resistance
0.31
0.8
V
<21dBm output power
0.380
V
IEEE802.11g, 54Mbps 64QAM modulation
10
Input Capacitance
k
5
Bandwidth
800
1000
pF
kHz
Sensitivity
0dBm to 7dBm
2
mV/dB
8dBm to 15dBm
10
mV/dB
>15dBm
20
mV/dB
Current Consumption
IEEE802.11g ICC
140
160
IEEE802.11b ICC
200
IPAEN
Leakage
180
mA
RF POUT = 15dBm, 54Mbps IEEE802.11g
220
240
mA
RF POUT = 19.5dBm, 11Mbps IEEE802.11b
240
400
A
PA EN = High
2
6
A
VB <4.0V all control inputs = “off”, no RF at 25°C
25
A
VB <4.0V all control inputs = “off”, no RF at 85°C
Power Supply
3.3
3.6
4.2
V
PA EN Voltage ON
1.6
1.8
2.0
V
PA is turned ON
V
PA is turned OFF
Used to drive the PABC current
PA EN Voltage OFF
0
PABC Voltage
0
1.0
V
PABC Current
0
1.8
mA
Input/Output Impedance

50
Output Load VSWR Ruggedness
No damage or permanent
degradation to device
VSWR = 10:1; all phase angles
(VRAMP set for POUT <22dBm into 50 load; load
switched to VSWR = 10:1)
Out of Band Gain (S21)
at 50 relative to minimal in-band gain
86MHz to 108MHz
30
dBr
776MHz to 894MHz
20
dBr
925MHz to 980MHz
20
dBr
dBr
1570MHz to 1580MHz
20
1805MHz to 1880MHz
20
dBr
1930MHz to 1990MHz
20
dBr
2110MHz to 2170MHz
15
dBr
Harmonics
RBW = 1MHz. Measured in CW.
Second
-30
dBc
4.80GHz to 5.00GHz
Third
-50
dBc
7.20GHz to 7.50GHz
Fourth
-60
dBc
2.4GHz Receive Parameters
Frequency
2.5
GHz
2.5
dB
Noise Figure
2.5
dB
Passband Ripple
0.3
dB
-9
dB
Insertion Loss
2.4
2.1
Output Return Loss
Output Impedance
DS20160920
100

Switch and Balun
No external matching
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RFFM3482Q
Specification
Min.
Typ.
Max.
Parameter
Unit
Condition
2.4GHz Receive Parameters
(continued)
Balun
Amplitude Balance
-1
1
dB
Phase Balance
-10
10
°
2.5
GHz
1.5
dB
Relative to 180°
Bluetooth Parameters
Frequency
2.4
Insertion Loss
1.0
Passband Ripple
-0.3
Input/Output Power P1dB
20
+0.3
SP3T switch, all unused ports terminated into their
nominal impedance
dB
dBm
Output Return Loss
-12
Output Impedance
50
-10
dB

No external matching
S
Output stable to within 90% of final gain
General Characteristics
Turn-On/Off Time
1.0
Antenna Port Impedance
Input
50

Receive
Output
50

Transmit
Switch Control Voltage
Low
0
0.1
High
1.6
V
2.0
V
Switch Control Current
4
A
Switch Control Speed
100
nsec
Per control line TX
Per control lines, TX, RX and BT
ESD
Human Body Model
500
V
EIA/JESD22-114A
Charge Device Model
750
V
EIA/JESD22-C101
*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
22
29
dB
WiFi TX to BT RX/TX
22
25
dB
WiFi RX to WiFi TX
20
38
dB
ANT TX
25
45
dB
ANT RX
25
28
dB
Switch Control Logic
Mode
BTW_SW
RX_SW
TX_SW
Bluetooth
1
0
0
0
WiFi TX
0
0
1
1
WiFi RX
0
1
0
0
Simultation BT/RX
1
1
0
0
Calibration
0
1
0
1
1
0
0
1
1
1
0
1
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PA_EN
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RFFM3482Q
Pin Names and Descriptions
Pin
1
2
3
4
Name
TXB
GND
BT
PAEN
5
6
7
8
VB
VB
PABC
PDET
9
10
11
12
13
14
15
16
Pkg
Base
VB
TX SW
RX SW
BTH SW
ANT
GND
RX+
RXGND
DS20160920
Description
RF input for the 802.11b/g/n PA. Input is matched to 50 and DC block is provided.
Ground.
RF bidirectional port for Bluetooth. Input is matched to 50 and DC block is provided.
Digital enable pin for the 802.11b/g/n PA. This is an active high control. An external bypass capacitor may be
needed on the PA EN line for decoupling purposes.
Supply voltage for the 802.11b/g/n PA.
Supply voltage for the 802.11b/g/n PA.
Linearity and Efficiency control pin, please see the Theory of Operation for more information.
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 802.11b/g/n PA.
Switch control port. See switch truth table for proper level.
Switch control port. See switch truth table for proper level.
Switch control port. See switch truth table for proper level.
FEM connection to filter and antenna. Port is matched to 50 and DC block is provided.
Ground.
Receive port for 802.11b/g/n band. Internally matched to 100 differential. DC block provided.
Receive port for 802.11b/g/n band. Internally matched to 100 differential. DC block provided.
The center metal base of the QFN package provides DC and RF ground as well as heat sink for the front end
module.
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RFFM3482Q
Package Drawing
QFN, 16-pin, 3mm x 3mm x 0.45mm
Notes:
1. Dimension applies to metallized terminal and is measured 0.25mm and 0.30mm from terminal tip.
2. Dimension represents terminal pull back from pacikage edge up to 0.1mm is acceptable.
3. Coplanarity applies to the exposed heat slug as well as hte terminal.
.
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DS20160920
RFFM3482Q
RXBN
RXBP
GND
ANT
Pin Out
16
15
14
13
TXB
1
12
BTH SW
GND
2
11
RX SW
3 mm x 3 mm x 0.45 mm
DS20160920
TX SW
PAEN
4
9
VB
6
7
8
PDET
5
PABC
10
VB
3
VB
BT
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RFFM3482Q
Application Schematic
50  strip
J3
-RX
J1
TX
J2
BT
50  strip
50  strip
16
50  strip
15
14
J4
+RX
J5
ANT
13
1
12
BT SW
2
11
RX SW
3
10
TX SW
50  strip
L1 3.3nH
PAEN
4
VBATT
9
5
6
7
8
C2 1uF
C3 1.5nF
U1
RF3482
C1 1.5nF
PDET
VBATT
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PABC
DS20160920
RFFM3482Q
Evaluation Board Schematic
50  strip
J3
-RX
J1
TX
J2
BT
50  strip
50  strip
16
50  strip
15
14
J5
ANT
13
1
12
BT SW
2
11
RX SW
3
10
TX SW
C2 1uF
(402)
50  strip
L2 3.3nH
PAEN
J4
+RX
4
9
5
6
7
VBATT
8
U1
RF3482
L1
0
C1 1nF
PDET
PABC
VBATT
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RFFM3482Q
Theory of Operation
The RFFM3482Q 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 addresses the need for aggressive size reduction for a typical 802.11b/g/n RF front end design,
and greatly reduces the number of components outside of the core chipset. Therefore, the footprint and assembly cost of the
overall 802.11b/g/n solution is minimized. The FEM has integrated b/g/n power amplifier, power detector, Rx balun, and Tx filtering. Also, it is capable of switching between WiFi Rx, WiFi Tx, and BTH RX/TX operations. It has low insertion loss at the
2.4GHz to 2.5GHz WiFi and BTH paths. The device is manufactured in a GaAs pHEMT processes, and provided in a 3mm x
3mm x 0.45mm, 16-pin package. This module meets or exceeds the RF front end needs of 802.11b/g/n WiFi RF systems.
For best results, the PA circuit layout from the evaluation board should be copied as closely as possible, particularly the ground
layout and ground vias. Other configurations may also work, but the design process is much easier and quicker if the layout is
copied from the RFFM3482Q evaluation board. 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. For the best performance, it is recommended that voltage
and RF lines do not cross under this pin. Gerber files of RFMD PCBA designs can be provided on request. The supply voltage
lines should present an RF short to the FEM by using bypass capacitors on the VB traces. The RFFM3482Q is a very easy part
to implement, but care in circuit layout and component selection is always advisable when designing circuits to operate at
2.5GHz. Please contact RFMD Sales or Application Engineering for additional data and guidance.
The RFFM3482Q is designed primarily for IEEE802.11 b/g/n WiFi applications where the available supply voltage and current
are limited. The RFFM3482Q requires a single positive supply voltage (VB), PA enable (PA_EN) supply, efficiency control
(PABC), and a positive supply for switch control to simplify bias requirements. The RFFM3842Q FEM also has built in power
detection. All inputs and outputs are internally matched to 50 except the WiFi receive path it is deferential with nominal
impedance of 100 on each pin.
802.11b/g/n Transmit Path
The RFFM3482Q has a typical gain of 33dB from 2.4GHz to 2.5GHz, and delivers 16.5dBm typical output power under
54Mbps OFDM modulation, and 21dBm under 1Mbps 11b modulation. The RFFM3482Q requires a single positive supply of
3.3V to 4.2V to operate at full specifications. PA control for the 802.11b/g/n band is provided through one bias control input
pin (PA_EN). The PA_EN pin requires a regulated supply to maintain nominal bias current. In general, the PABC pin controls
acts as an efficiency and linearity control pin. The current or voltage applied at this pin may produce higher linear output
power, higher operating current, and higher gain.
Out of Band Rejection
The RFFM3482Q contains basic filtering components to produce bandpass responses for the WiFi transmit path. Due to space
constraints inside the module, filtering is limited to a few resonant poles on the RF path.
802.11b/g/n Receive Path
The 802.11b/g/n path has a100 differential impedance with a nominal insertion loss of 2.1dB. The RX port return loss is
-9dB maximum. Depending on the application, if filtering is required beyond what the RFFM3482Q can achieve then additional
external filters will need to be added outside of the RFFM3482Q.
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RFFM3482Q
RFFM3842Q Biasing Instructions:
• 802.11b/g/n Transmit (VB compliance = 5.5V, 400mA, PA EN compliance = 2V, ~450mA)
• Connect the FEM to a signal generator at the input and a spectrum analyzer at the output.
• Bias VB to 3.6V first with PA_EN = 0.0V
• Refer to switch operational truth table to set the control lines at the proper levels for WiFi Tx.
• Turn on PA_EN to 1.8V (typ.). Be extremely careful not to exceed 3.0V on the PA_EN pin, or the part may exceed device current limits.
• Turn on PABC to 1.5mA (or 0.6V). For 11b operation Adjust PABC to 1.8mA. This controls the current drawn by the
802.11b/g/n power amplifier and the idle current should rise to ~115mA ± 20mA for a typical part, but it varies based on
the output power desired.
• 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.
IBIAS Table
WiFi PABC
Standard
Modulation
Units
IEEE 802.11b
CCK
1.8
mA
IEEE 802.11g
54OFDM
1.5
mA
IEEE 802.11n
MCS7
1.6
mA
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RFFM3482Q
PCB Design Requirements
PCB Surface Finish
The PCB surface finish used for RFMD's qualification process is electroless nickel, immersion gold. Typical thickness is 3 microinch to 8 micro-inch gold over 180 micro-inch nickel.
PCB Land Pattern Recommendation *
PCB land patterns for RFMD components are based on IPC-7351 standards and RFMD empirical data. The pad pattern shown
has been developed and tested for optimized assembly at RFMD. The PCB land pattern has been developed to accommodate
lead and package tolerances. Since surface mount processes vary from company to company, careful process development is
recommended.
PCB Metal Land Pattern
6x 0.250
4x 1.300
8x
0.300
8x 0.300
2x 0.750
6x 0.250
2x 0.250
0.000
2x 0.250
2x 0.750
4x 1.300
2x 0.750
2x 0.250
0.000
2x 0.250
2x 0.750
4x 1.300
4x 1.300
PCB METAL PATTERN
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RFFM3482Q
PCB Solder Mask Pattern
Liquid Photo-Imageable (LPI) solder mask is recommended. The solder mask footprint will match what is shown for the PCB
metal land pattern with a 2 mil to 3 mil expansion to accommodate solder mask registration clearance around all pads. The
center-grounding pad shall also have a solder mask clearance. Expansion of the pads to create solder mask clearance can be
provided in the master data or requested from the PCB fabrication supplier.
6x 0.130
4x 1.300
8x
0.180
8x 0.180
2x 0.750
6x 0.130
2x 0.250
0.000
2x 0.250
2x 0.750
4x 1.300
2x 0.750
2x 0.250
0.000
2x 0.250
2x 0.750
4x 1.300
4x 1.300
PCB SOLDER MASK PATTERN
Thermal Pad and Via Design
The PCB land pattern has been designed with a thermal pad that matches the die paddle size on the bottom of the device.
Thermal vias are required in the PCB layout to effectively conduct heat away from the package. The via pattern has been
designed to address thermal, power dissipation and electrical requirements of the device as well as accommodating routing
strategies.
The via pattern used for the RFMD qualification is based on thru-hole vias with 0.203mm to 0.330mm finished hole size on a
0.5mm to 1.2mm grid pattern with 0.025mm plating on via walls. If micro vias are used in a design, it is suggested that the
quantity of vias be increased by a 4:1 ratio to achieve similar results.
DS20160920
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support, contact RFMD at (+1) 336-678-5570 or customerservice@rfmd.com.
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