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RF5187
0
RoHS Compliant & Pb-Free Product Typical Applications * 2.14GHz UMTS Systems * Digital Communication Systems * PCS Communication Systems * Commercial and Consumer Systems
LOW POWER LINEAR AMPLIFIER
Product Description
The RF5187 is a highly-linear, low-power amplifier IC. It has been designed for use as the driver RF amplifier in applications such as W-CDMA basestations. The RF5187 requires an input and output matching network and power supply feed line. The device is manufactured on an advanced Gallium Arsenide HBT process, and is packaged in a 8-pin plastic package with a backside ground.
0.157 0.150 0.0192 0.0138 0.004 0.002
-A-
0.196 0.189
0.050
0.244 0.230 Shaded lead is pin 1. EXPOSED HEATSINK
0.065 0.055
0.123 0.107
8 MAX 0 MIN 0.035 0.016 0.087 0.071 0.0098 0.0075
Optimum Technology Matching(R) Applied
Si BJT Si Bi-CMOS InGaP/HBT GaAs HBT SiGe HBT GaN HEMT GaAs MESFET Si CMOS SiGe Bi-CMOS
Package Style: SOIC-8 Slug
Features * Single 3V to 6V Supply * 10dBm to 20dBm Ultra Linear Output Power * 14dB Gain at 2.14GHz * Power Down Mode * 800MHz to 2500MHz Operation
RF IN 1 RF IN 2 PC 3 VCC 4 PACKAGE BASE GND
8 RF OUT 7 RF OUT 6 RF OUT 5 RF OUT
BIAS CIRCUIT
Ordering Information
RF5187 Low Power Linear Amplifier RF5187PCBA-41X Fully Assembled Evaluation Board
Functional Block Diagram
RF Micro Devices, Inc. 7628 Thorndike Road Greensboro, NC 27409, USA
Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com
Rev A7 060630
2-649
RF5187
Absolute Maximum Ratings Parameter
Supply Voltage (VCC) Power Control Voltage (VPC) DC Supply Current Input RF Power Output Load VSWR Operating Ambient Temperature Storage Temperature
Rating
-0.5 to +6.5 -0.5 to +5V 300 +20 20:1 -40 to +85 -40 to +100
Unit
VDC V mA dBm C C Caution! ESD sensitive device.
RF Micro Devices believes the furnished information is correct and accurate at the time of this printing. RoHS marking based on EUDirective2002/95/EC (at time of this printing). However, RF Micro Devices reserves the right to make changes to its products without notice. RF Micro Devices does not assume responsibility for the use of the described product(s).
Parameter
Overall
Frequency Range Output Power OP1dB Small Signal Gain Input VSWR
Specification Min. Typ. Max.
Unit
Condition
T=25C, VCC =5.0V, ICC =240mA, Freq=2140MHz, POUT =13dBm
800 13 29 13 1.5:1 41 2.7 0.2 43 3.1 0.5
2500
15
MHz dBm dBm dB With external matching network.
Two-Tone Specification
Output IP3 45 3.7 dBm V V 13dBm per tone. To obtain 240mA idle current. Threshold voltage at device input.
Power Control
VPC Power Control "OFF"
Power Supply
Power Supply Voltage 5 6 V Supply Current 240 mA Power Down Current 2 10 A VPC =0.2V Note: For infrastructure class operation, the maximum allowable current over all operating conditions is 260mA. This implies the need for an external active bias control network to control ICC over temperature and normal process variation. A recommended active bias control circuit is included in the datasheet. The maximum continuous allowable dissipated power (ICC *VCC -PRF) for this part is 1.3W. For VCC =5.0V, this implies an ICC limit of 260mA. A VCC of 6.0V would have an ICC limit of 215mA. A constant ICC of 180mA to 220mA provides an excellent combination of high linearity and low power dissipation. Refer to W-CDMA ACP curves at bottom of datasheet.
2-650
Rev A7 060630
RF5187
Pin 1 Function RF IN Description
RF input. This input is DC-coupled, so an external blocking capacitor is required if this pin is connected to a DC path. An optimum match to 50 is obtained by providing an external series capacitor of 2.4pF and then a shunt capacitor of 2.4pF. Those values are typical for 2140MHz; other values may be required for other frequencies. Same as pin 1. Power control pin. For obtaining maximum performance, the voltage on this pin can be used to set correct bias level. For low power linear applications, it is recommended that a constant bias control loop be used (see datasheet evaluation board schematic). A voltage of 0.5V or less at VPC brings the part into Power Down State. Power supply pin for the bias circuits. External low frequency bypass capacitors should be connected if no other low frequency decoupling is nearby. RF output and bias for the output stage. The power supply for the output transistor needs to be supplied to this pin. This can be done through a quarter-wavelength microstrip line that is RF-grounded at the other end, or through an RF inductor that supports the required DC currents. Optimum load impedance is achieved by providing a shunt capacitor of 1.8pF and a series capacitor of 3.3pF. Those values are typical for 2140MHz; other values may be required for other frequencies. Since there are several output pins available (which are internally connected), one pin can be used for connecting the bias, another for connecting a (third) harmonic trap filter, and the other pins for the RF output. Same as pin 5. Same as pin 5. Same as pin 5. Ground connection. The backside of the package should be connected to the ground plane through a short path (i.e., vias under the device may be required).
Interface Schematic
2 3
RF IN PC
4 5
VCC RF OUT
6 7 8 Pkg Base
RF OUT RF OUT RF OUT GND
Rev A7 060630
2-651
RF5187
Evaluation Board Schematic 2140MHz Operation
J1 RF IN 50 strip C2 3 pF 1 C1 2.4 pF VPC C6 1000 pF 2 3 4 PACKAGE BASE VCC VCC = 5 V f = 2140 MHz POUT = 13 dBm C8 1 uF C7 1000 pF C5 33 pF 8 7 6 5 P1-1 L1 4.7 nH P1-3 C3 1.5 pF P1 1 2 3 CON3 VCC GND VPC C3 3.3 pF 50 strip
J2 RF OUT
BIAS CIRCUIT
Constant Bias Circuit
5.0 V
R1 R3 To VCC pins through LPF Q1 Q2 To VPC pin through LPF R2 R4
Bias Point mA 100 120 150 180 200 220 240
R1 120 120 120 120 120 120 120
R2 1200 1200 1200 1200 1200 1200 1200
R3 3.6 3.0 2.5 2.0 1.8 1.7 1.6
R4 820 820 820 820 820 820 820
2-652
Rev A7 060630
RF5187
Evaluation Board Layout Board Size 1.5" x 1.0"
Board Thickness 0.031", Board Material FR-4
Rev A7 060630
2-653
RF5187
ACP versus POUT versus ICC
-52.0 -53.0 -54.0 -55.0 -56.0 -57.0 Freq=2140MHz, Signal=W-CDMA Test Model I 64 DPCH VCC=5.0V
ACP @ 5 MHz Offset
-58.0 -59.0 -60.0 -61.0 -62.0 -63.0 -64.0 -65.0 -66.0 -67.0 -68.0 -69.0 -70.0 120 mA 150 mA 180 mA 200 mA 220 mA 240 mA 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 17.0 18.0 19.0 20.0
POUT (dBm)
2-654
Rev A7 060630

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