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RF5122
3V TO 4.5V, 2.4GHz TO 2.5GHz LINEAR POWER AMPLIFIER
RoHS Compliant & Pb-Free Product Package Style: QFN, 8-Pin, 2.2mmx2.2mmx0.6mm
VCC
Features
Single Power Supply 3.0V to 3.6V 24dB Minimum Gain Input and Output Matched to 50 2400MHz to 2500MHz Frequency Range +18dBm @ <2.5% typ EVM, 120mA @ 3.3VCC
RF IN 1
Input Match
8
VC1 7
6 VC2
Interstage Match Output Match
VREG 2
Bias Circuit
Power Detector
5 RF OUT
3 PDETECT
4 N/C
Applications
IEEE802.11b/g/n WLAN Applications 2.5GHz ISM Band Applications Commercial and Consumer Systems Portable Battery-Powered Equipment Spread-Spectrum and MMDS Systems
Functional Block Diagram
Product Description
The RF5122 is a linear, medium-power, high-efficiency, two-stage amplifier IC designed specifically for battery-powered WLAN applications such as PC cards, mini PCI, and compact flash applications. The device is manufactured on an advanced InGaP Gallium Arsenide Heterojunction Bipolar Transistor (HBT) process, and has been designed for use as the final RF amplifier in 2.5GHz OFDM and other spreadspectrum transmitters. The device is provided in a 2.2mmx2.2mm, 8-pin, QFN with a backside ground. The RF5122 is designed to maintain linearity over a wide range of supply voltages and power outputs. The RF5122 also has built-in power detector and incorporates the input, interstage, and output matching components internally which reduces the component count used externally and makes it easier to incorporate on any design.
Ordering Information
RF5122 RF5122PCBA-41X 3V to 4.5V, 2.4GHz to 2.5GHz Linear Power Amplifier Fully Assembled Evaluation Board
Optimum Technology Matching(R) Applied
GaAs HBT GaAs MESFET InGaP HBT SiGe BiCMOS Si BiCMOS SiGe HBT GaAs pHEMT Si CMOS Si BJT GaN HEMT
RF MICRO DEVICES(R), RFMD(R), Optimum Technology Matching(R), Enabling Wireless ConnectivityTM, PowerStar(R), POLARISTM TOTAL RADIOTM and UltimateBlueTM 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. (c)2006, RF Micro Devices, Inc.
Rev A5 DS070517
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RF5122
Absolute Maximum Ratings Parameter
Supply Voltage Power Control Voltage (VREG) DC Supply Current Input RF Power Operating Ambient Temperature Storage Temperature Moisture sensitivity ESD HBM MM
Rating
-0.5 to +5.0 -0.5 to 3.5 400 +5 -30 to +85 -40 to +150 JEDEC Level 2 450 50
Unit
VDC V mA dBm C C V V
Caution! ESD sensitive device.
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. RoHS status based on EUDirective2002/95/EC (at time of this document revision).
Parameter
Min.
Specification Typ.
Max.
Unit
Condition
Temperature=+25C, VCC =3.3V, VREG =2.8V pulsed at 1% to 100% duty cycle, Frequency=2450MHz, circuit per evaluation board schematic, unless otherwise specified
Overall
Frequency
Output Power EVM* Gain Gain Variance Power Detector POUT =8dBm POUT =18dBm Current Operating Quiescent IREG Current Shutdown Power Supply VREG1, VREG2 Input Voltage Output VSWR Input Return Loss Turn-on Time** Second Harmonic
2.40 18 2.5 24 25.5
2.50
GHz dBm
IEEE802.11g IEEE802.11n At max data rate, OFDM modulation RMS, mean At +18dBm RF POUT and 54Mbps -30C to +85C
4 1.25
% dB dB V V mA mA mA
0.4 1.25 1.35 120 85 2
0.7 1.50 145
At +18dBm RF POUT and 54Mbps Data rate @<3.5% EVM RMS, mean, T=-30C to +50C VCC =+3.3VDC Operating Range Operating Range
10 3.0 2.75 3.3 2.8 -15 0.5 4.5 2.9 10:1 -10 1.0 -27
A VDC VDC dB S dBm Output stable to within 90% of final gain Fundamental frequency is between 2400MHz and 2500MHz; RF POUT =+18dBm. See note 2.
Notes: *The EVM specification is obtained with a signal generator that has an EVM floor of less than 0.7%. **The PA must operate with gated bias voltage input at 1% to 99% duty cycles without any EVM or other parameter degradation. Note 2: For best harmonic rejection please refer to the harmonic rejection application schematic.
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Rev A5 DS070517
RF5122
Pin 1 Function RF IN Description
RF input. Input is matched to 50 and DC block is provided internally.
Interface Schematic
VCC Interstage Match Input Match
2 3 4 5
VREG PDETECT N/C RF OUT
Bias current control voltage for the first and second amplifier stage. Power detector which provides an output voltage proportional to the RF output power level. May need external decoupling capacitor for stability. May need external circuitry to bring output voltage to desired level. Must be left as no connect, not grounded. RF output. Output is matched to 50 and DC block is provided internally.
VCC2 Output Match
RF OUT
6 7 8 Pkg Base
VC2 VC1 VCC GND
Voltage supply for the second amplifier stage. Voltage supply for the first amplifier stage. Supply voltage for the bias reference and control circuit. May be connected with VC1 and VC2 (with a single supply voltage) as long as VCC does not exceed +4.5VDC in this configuration. The center metal base of the QFN package provides DC and RF ground as well as heat sink for the amplifier.
Package Drawing
INDEX AREA 2 PLCS 0.10 C 0.10 C 2 PLCS
0.63 0.53
0.152 REF
2.20
B A
2.20 0.65
0.05 0.00
SEATING PLANE C
0.10 MAX
1.20 TYP 1.00 0.28 0.18
0.31 0.21
Dimensions in mm.
Shaded lead is pin 1.
0.10 M C A B
Rev A5 DS070517
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RF5122
Pin Out
VCC VC1 7
8
RF IN 1
6 VC2
VREG 2
5 RF OUT
3 PDETECT
4 N/C
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Rev A5 DS070517
RF5122
Theory of Operation and Application Information
The RF5122 is a two-stage power amplifier (PA) with a minimum gain of 24dB minimum gain in the 2.4GHz to 2.5GHz ISM band. The RF5122 has integrated input, interstage and output matching components thus allowing minimal bill of material (BOM) parts count in end applications. The RF5122 is designed primarily for IEEE802.11b/g/n WLAN applications where the available supply voltage and current are limited. This amplifier will operate to (and below) the lowest expected voltage made available by a typical PCMCIA slot in a laptop PC, and will maintain required linearity at decreased supply voltages. The RF5122 requires only a single positive supply of 3.3V nominal (or greater) to operate to full specifications. Power control is provided through one bias control input pin (VREG). DC blocking caps are provided internally and the evaluation board circuit (available from RF Micro Devices, Inc. (RFMD)) is optimized for 3.3VDC applications. 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. Pin 4 must be left as a no-connect on the PCB in order for the PA to work properly. Other configurations may also work, but the design process is much easier and quicker if the layout is copied from the RF5122 evaluation board. Gerber files of RFMD PCBA designs can be provided on request. The RF5122 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. The RF5122 evaluation board layout and schematic are available using 0201 (US) size components which will help shrink the overall size of the total area of the PA and components of the intended design. Please contact RFMD Sales or Application Engineering for additional data and guidance. For best performance, it is important to duplicate (as closely as possible) the layout of the evaluation board. The RF5122 has primarily been characterized with a voltage on VREG of 2.8VDC. If you prefer to use a control voltage that is significantly different than 2.8VDC, or a different frequency than the recommended frequency range, contact RFMD Sales or Applications Engineering for additional data and guidance.
QFN8 Package Area versus Other Small Form Factor Package Areas
Package Type
SOT 23-6 QFN12 SOT 23-5 QFN8
Length (mm)
3.1 3.0 2.9 2.2
Width (mm)
3.0 3.0 2.8 2.2
Area (mm2)
9.30 9.00 8.12 4.84
Delta () (mm2) to QFN8
4.46 4.16 3.28 0.00
An application schematic for 2.5GHz operation is included that has two additional components, one shunt inductor, and one shunt capacitor, on the output for improved second harmonic rejection. This layout provides ~20dB rejecetion at 5GHz with a minimal BOM count.
Rev A5 DS070517
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RF5122
Application Schematic
for Improved Second Harmonic Performance
VCC 1 F
1 nF
27 nH
VCC 8 7
1 F
RF IN
1
Input Match Interstage Match Output Match
6
1.2 nH* VREG 2
Bias Circuit Power Detector
10 pF RF OUT
5 2.2 pF*
3
4**
330 pF
* The 2.2 pF cap can be placed at the same point as the 1.2 nH inductor which should be as close as possible to the DC blocking cap (10 pF) the placement can be modified for the best linear performance. A series capacitor (10 pF) must be added to provide a DC block after the 2F0 Filter. **Pin 4 must be left as a no-connect on the PCB.
PDETECT
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Rev A5 DS070517
RF5122
Evaluation Board Schematic
VCC P1 1 P1-2 P1-3 2 3 P2 3 2 1 GND VCC VCC C2 1 nF L1 27 nH C1 1 F
P2-3 P3-3
VREG PDETECT GND
C3 1 F 8 7 L2 0 6
Input Match Interstage Match Output Match
J1 RF IN
50 strip 1
R1 0 VREG 2
Bias Circuit Power Detector
50 strip 5
J4 RF OUT
3
4 *Pin 4 should be left as a no-connect on the PCB.
NOTE: The RF5122 evaluation board layout and schematic are available using 0201 (US) size components which will help shrink the overall size of the total area of the PA and components of this intended design. Please contact RFMD Sales or Application Engineering for additional data and guidance.
C6 330 pF
R2 0
PDETECT
Rev A5 DS070517
7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
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RF5122
Evaluation Board Layout Board Size 1.0" x 1.0"
Board Thickness 0.031"; Board Material FR-4; Multi-Layer
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Rev A5 DS070517
RF5122
ACP versus POUT
0.0 ACP1 2400MHz ACP1 2450MHz ACP1 2500MHz 2400MHz ACP2 2450MHz ACP2 2500MHz ACP2
8.0 7.5 7.0 6.5 6.0 5.5 2400MHz 2450MHz 2500MHz
EVM versus POUT
-10.0
-20.0
-30.0
5.0
ACP (dBm)
EVM (%)
4.5 4.0 3.5 3.0 2.5
-40.0
-50.0
-60.0
2.0 1.5
-70.0
1.0 0.5
-80.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0
0.0 0.0 5.0 10.0 15.0 20.0
Output Power (dBm)
Output Power (dBm)
Gain verus POUT
30.0 150.0 140.0 29.0 130.0 28.0 120.0 110.0
Operating Current versus POUT
27.0
Gain (dB)
ICC (mA)
100.0 90.0 80.0 70.0 60.0
26.0
25.0
24.0 2400MHz 2450MHz 2500MHz 0.0 5.0 10.0 15.0 20.0 25.0
23.0
50.0 40.0 0.0 5.0 10.0 15.0
2400MHz 2450MHz 2500MHz 20.0
22.0
Output Power (dBm)
Output Power (dBm)
PDETECT versus POUT
1.8 1.6 1.4 1.2
PDETECT (V)
1.0 0.8 0.6 0.4 0.2 0.0 0.0 5.0 10.0 15.0 20.0 2400MHz 2450MHz 2500MHz
Output Power (dBm)
Rev A5 DS070517
7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
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RF5122
PCB Design Requirements
PCB Surface Finish The PCB surface finish used for RFMD's qualification process is electroless nickel, immersion gold. Typical thickness is 3inch to 8inch gold over 180inch nickel. PCB Land Pattern Recommendation PCB land patterns are based on IPC-SM-782 standards when possible. The pad pattern shown has been developed and tested for optimized assembly at RFMD; however, it may require some modifications to address company specific assembly processes. The PCB land pattern has been developed to accommodate lead and package tolerances. PCB Metal Land Pattern
A = 0.44 x 0.28 Typ. B = 0.28 x 0.44 Typ. C = 1.30 Sq.
Dimensions in mm.
0.65 Typ.
Pin 8
B
Pin 1
B
Pin 6
0.32 Typ.
A C A
A 0.65 Typ. A
0.68 Typ. B 0.68 Typ. B
Pin 4
0.32 Typ.
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Rev A5 DS070517
RF5122
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 2mil to 3mil 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.
A = 0.57 x 0.41 Typ. B = 0.41 x 0.57 Typ. C = 1.20 Sq.
Dimensions in mm.
0.65 Typ.
Pin 8
B
Pin 1
B
Pin 6
0.32 Typ.
A C A
A 0.65 Typ. A
0.68 Typ. B 0.68 Typ. B
Pin 4
0.32 Typ.
Rev A5 DS070517
7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
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RF5122
RoHS* Banned Material Content
RoHS Compliant: Pack age total weight in grams (g): Compliance Date Code: B ill of Materials Revision: Pb Free Category: Yes 0.008 N/A e3 P a r ts P e r M i l l i o n ( P P M ) Pb 0 0 0 0 0 0 Cd 0 0 0 0 0 0 Hg 0 0 0 0 0 0 Cr VI 0 0 0 0 0 0 PB B 0 0 0 0 0 0 PB
B i l l o f M a te r i a l s Die M o l d i n g Co m p o u n d Le a d F r a m e D i e A tta c h E p o x y Wire S o l d e r P l a ti n g
T h i s R o H S b a n n e d m a te r i a l c o n te n t d e c l a r a ti o n w a s p r e p a r e d s o l e l y o n i n f o r m a ti o n , i n c l u d i n g a n a d a ta , p r o v i d e d to R F M D b y i ts s u p p l i e r s , a n d a p p l i e s to th e B i l l o f M a te r i a l s ( B O M ) r e v i s i o n n o * DIRECTIVE 2002/95/EC OF THE EU ROPEAN PARLIAMENT AND OF THE COUNCIL of 27 January 2003 on the restriction o use of certain hazardous substances in electrical and electronic equipment
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Rev A5 DS070517

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