TETRA Cellular Handsets CDMA Cellular Handsets Portable Battery-Powere

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TETRA Cellular Handsets CDMA Cellular Handsets Portable Battery-Powere

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RF2175
TETRA Cellular Handsets CDMA Cellular Handsets Portable Battery-Powered Equipment
POWER AMPLIFIERS
RF2175 high-power, high-efficiency linear amplifier targeting handheld systems. device manufactured advanced Gallium Arsenide Heterojunction Bipolar Transistor (HBT) process, been designed final amplifier TETRA handheld digital cellular equipment, spread-spectrum systems, other applications 380MHz 512MHz band. RF2175 analog bias control voltage maximize efficiency. device self-contained with input, output easily matched obtain optimum power, efficiency, linearity characteristics. package small PSSOP-16 plastic with backside ground.
.157 .150
.012 .008 .025
.003 .001
EXPOSED HEATSINK
.197 .189
.102 .110
.244 .228 °MAX 0°MIN
.059 .051
.062 .070
.030 .018
.009 .008
Bi-CMOS
GaAs SiGe
GaAs MESFET CMOS
Single Supply 30dBm Linear Output Power 37.5dB Linear Gain Linear Efficiency On-Board Power Down Mode 380MHz 512MHz Operation
LTUNE GND1
Bias
VBIAS
RF2175 RF2175 PCBA 400MHz Linear Amplifier Fully Assembled Evaluation Board
VREG
Micro Devices, Inc. 7625 Thorndike Road Greensboro, 27409,
(336) 1233 (336) 0454 http://www.rfmd.com
000628
2-243
RF2175
Absolute Maximum Ratings Parameter
Supply Voltage Off) Supply Voltage (POUT <31dBm) Mode Voltage (VBIAS) Control Voltage (VREG) Input Power (Avg.) Output VSWR Inband Output VSWR Band Operating Ambient Temperature Storage Temperature
Preliminary
Rating
+8.0 +5.2 +4.8 +4.8 10:1 20:1 +150
Unit
Caution! sensitive device.
Micro Devices believes furnished information correct accurate time this printing. However, Micro Devices reserves right make changes products without notice. Micro Devices does assume responsibility described product(s).
POWER AMPLIFIERS
Parameter
Overall
Usable Frequency Range Typical Frequency Range Linear Gain Second Harmonic (including Second Harmonic Trap) P3dB Output Power Maximum Linear Output Power (TETRA Modulation) Total Linear Efficiency Adjacent Channel Power Rejection
Specification Min. Typ. Max.
Unit
Condition
T=25°C, =3.6V, Freq=410MHz 420MHz unless otherwise specified, duty cycle. Freq 410MHz 420MHz
35.5 37.5
39.5
ACPR@ 25kHz, TETRA modulation ACPR@ 50kHz, TETRA modulation
Power Supply
Power Supply Voltage Idle Current VREG Current Turn On/Off Time Total Current (Power Down) VREG "Low" Voltage VREG "High" Voltage VBIAS Control Voltage Range
Total pins VREG change VREG =Low
<100
2-244
000628
Preliminary
Function TUNE GND1 VREG Description
Power supply input bias circuitry. high frequency bypass capacitor recommended. Interstage Tuning. shunt inductor required optimize match. connection. Power supply stage should through 25nH greater inductor with decoupling capacitor side. Ground stage Keep traces physically short connect immediately ground plane best performance. This ground should isolated from backside ground contact. input. external blocking capacitor required this port connected path ground voltage. connection. Power Down control. When this "low", circuits shut off. When this 2.8V, circuits operating normally. requires regulated 2.8V amplifier operate properly over specified temperature voltage ranges. dropping resistor from higher regulated voltage used provide required 2.8V. 100pF high frequency bypass capacitor recommended. connection. connection. connection. output power supply output stage. bias output stage provided through this external matching network required provide optimum load impedance; application schematics details. Same Harmonic trap. This connects output used providing impedance second harmonic operating frequency. inductor transmission line resonating with shunt capacitor connected this pin. connection. bias allows higher efficiency power power modes. When operating full output, VBIAS should 2.8V. Ground connection. backside package should soldered side ground pad, which connected ground plane with multiple vias. should have short thermal path ground plane.
RF2175
Interface Schematic
POWER AMPLIFIERS
Base
VBIAS
000628
2-245
RF2175
(Download Bill Materials from www.rfmd.com.)
Preliminary
VMODE
2175400A
POWER AMPLIFIERS
Bias 12.55
µstrip
µstrip
VREG
P1-1 P1-3 CON3 VREG P2-3 P2-1
CON3 VMODE
2-246
000628
Preliminary
Board Thickness 0.028", Board Material FR-4
RF2175
POWER AMPLIFIERS
000628
2-247
RF2175
Preliminary
POWER AMPLIFIERS
2-248
000628

TETRA Cellular Handsets CDMA Cellular Handsets Portable Battery-Powere

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