CDMA/TDMA/DCS1900 Systems 1500/WLAN 2400 Systems General Purpose Downc

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CDMA/TDMA/DCS1900 Systems 1500/WLAN 2400 Systems General Purpose Downc

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RF2486
CDMA/TDMA/DCS1900 Systems 1500/WLAN 2400 Systems General Purpose Downconverter Micro-Cell Base Stations Portable Battery-Powered Equipment
NOISE AMPLIFIER/MIXER
Product Description
RF2486 monolithic integrated receiver front-end PCS, PHS, WLAN applications. contains required components implement functions receiver front-end except passive filtering generation. contains (low-noise amplifiers), double-balanced Gilbert cell mixer, balanced output, isolation buffer amplifier, output buffer amplifier providing buffered signal output. designed operate from single 3.6V power supply.
0.157 0.150
0.0098 0.0040
0.344 0.337
0.012 0.00
0.025 0.0688 0.0532
0.2440 0.2284 8°MAX 0°MIN
0.0098 0.0075
0.050 0.016
Optimum Technology Matching® Applied
Package Style: SSOP-24
Bi-CMOS
VCC1 VCC2 GND1 GND2 GND3 GND4 VCC3 BUFF
GaAs SiGe
GaAs MESFET CMOS
GND9 VCC4 GND8 GND7 GND6 IF15 GND5 BUFF
Features
Complete Receiver Front-End High Dynamic Range Single 3.6V Power Supply External Adjustment 1500MHz 2500MHz Operation
Ordering Information
RF2486 Noise Amplifier/Mixer RF2486 PCBA-L Fully Assembled Evaluation Board 1.96GHz RF2486 PCBA-H Fully Assembled Evaluation Board 2.4GHz Micro Devices, Inc. 7628 Thorndike Road Greensboro, 27409, (336) 1233 (336) 0454 http://www.rfmd.com
Functional Block Diagram
010717
8-105
FRONT-ENDS
RF2486
Absolute Maximum Ratings Parameter
Supply Voltage Input Levels Ambient Operating Temperature Storage Temperature
Rating
-0.5 +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).
Parameter
Overall
Frequency Range Frequency Range Frequency Range
Specification Min. Typ. Max.
1500 1200 2500 2500
Unit
Condition
25°C, =3.6V, RF=1959MHz, LO=1749MHz
balanced load, 2.5dB Image Filter Loss.
Cascaded Performance
Cascade Conversion Gain Cascade Input Cascade Noise Figure
First Section (LNA)
Single Sideband section left unused. Power connected performance then specified Second Section (Mixer). Input internally matched optimum noise figure from source. increased 10dB connecting through matching inductor. LNA's current then increases 10mA. Other in-between versus trade-offs made. description R2=Open R2=Short
FRONT-ENDS
Noise Figure Input VSWR Input
1.5:1
2.0:1
Gain Reverse Isolation Output VSWR
+8.5 13.5 <1.5:1 1.5:1
Second Section (Mixer)
Noise Figure Input VSWR Input Conversion Gain Output Impedance
With balanced load. Single Sideband
Balanced
Input
Input Range Output Level (Mix Rejection IF1, Rejection Input VSWR 1.5:1 Buffer +1dBm input Buffer Off, +1dBm input
Single ended
Power Supply
Voltage Current Consumption only Mixer, Buffer Mixer, Buffer
8-106
010717
RF2486
Function VCC1 Description
connection. This grounded (recommended) left open. Supply voltage mixer buffer amplifier. External bypassing required. trace length between bypass capacitor should minimized. ground side bypass capacitor should connect immediately ground plane. Supply voltage LNA. External bypassing required. trace length between bypass capacitor should minimized. ground side bypass capacitor should connect immediately ground plane. Ground connection LNA. best performance, keep traces physically short connect immediately ground plane. input LNA. This internally matched minimum noise figure (NOT minimum VSWR), given source impedance. This internally DC-blocked. Same Ground connection buffer amplifier. best performance, keep traces physically short connect immediately ground plane. connection. This grounded (recommended) left open. Same Supply voltage both buffer amplifiers. External bypassing required. trace length between bypass capacitor should minimized. ground side bypass capacitor should connect immediately ground plane. Enable output buffer amplifier. This digitally controlled input. logic "high" (3.1V) turns buffer amplifier current consumption increases (with -2dBm input). logic "low" (0.5V) turns buffer amplifier off. Mixer input pin. This internally DC-blocked matched Optional buffered output. This internally DC-blocked matched buffer amplifier switched voltage level Ground connection both buffer amplifiers. best performance, keep traces physically short connect immediately ground plane. Open-collector output pin. This balanced output. output impedance internal 1000 resistor Thus differential output impedance 1000. resistor sets operating impedance, external choke matching inductor must supplied order bias this output. This inductor typically incorporated matching network between output filter. Because this biased VCC, blocking capacitor must used filter input path ground. Same except complementary output. Ground connection mixer. best performance, keep traces physically short connect immediately ground plane. Mixer input pin. This internally DC-blocked matched Same
VCC1 BIAS VCC4
Interface Schematic
VCC2
GND1
GND2 GND3 GND4 VCC3
BUFF GND5
IFGND6 GND7
010717
8-107
FRONT-ENDS
BUFF
BUFF
RF2486
Function Description
output pin. This open-collector output. This typically connected through bias/matching inductor. This inductor, conjunction with series blocking/matching capacitor, forms matching network image filter provides bias (see application schematic). LNA's increased 10dB connecting through inductor. LNA's current then increases 10mA. Other in-between versus trade-offs made connecting resistance values between matching inductor. reference points consideration with used, which what connection achieves, input +5.5dBm 5mA. Using resistance, input +15.5 Desired operating points between these values roughly interpolated. Same Output supply voltage output (pin 20). This typically connected through bias/matching inductor (see application schematic). External bypassing required. trace length between bypass capacitor should minimized. ground side bypass capacitor should connect immediately ground plane. Same connection. This grounded (recommended) left open.
Interface Schematic
GND8 VCC4
GND9
FRONT-ENDS
Application Schematic 1.96GHz, 210MHz
evaluation board
LNA2 ENBL
Filter
Filter
8-10
010717
RF2486
Evaluation Board Schematic 1.96GHz, 210MHz
(Download Bill Materials from www.rfmd.com.)
µstrip µstrip trip
otes µstrip µstrip
µstrip
trip
trip TOKO
BUFF
486400
ents ted. selecte fine tput ally late plica tion uiring itio resistanc ally pulate pulated ntly filter, tead allow ratio
FRONT-ENDS
010717
8-109
RF2486
Evaluation Board Schematic 2.4GHz, 280MHz
(Download Bill Materials from www.rfmd.com.)
LNA2 µstrip µstrip µstrip
µstrip
**See Notes** µstrip
FL1*
µstrip
**See Notes** MIXER
TOKO
BUFF
FRONT-ENDS
2486401-
µstrip *Components normally populated. NOTES: selected Fine Tune Output Match MHz. normally populated. applications requiring additional IP3, datasheet recommended resistance values. normally populated. populated, mixer tested independently. this case, should removed. part with onboard filter, populate C1a, C2a. instead. This will allow cascaded operation only. P1-1 P1-3 CON3 BUFFER ENABLE
8-110
010717
RF2486
Evaluation Board Layout 1.96GHz Board Size 3.0" 3.0"
Board Thickness 0.075.6", Board Material FR-4, Multi-Layer
mils between Layers mils between Layers ounce copper layers)
FRONT-ENDS
010717
8-111
RF2486
Evaluation Board Layout 2.4GHz Board Size 3.0" 3.0"
FRONT-ENDS
8-112
010717

CDMA/TDMA/DCS1900 Systems 1500/WLAN 2400 Systems General Purpose Downc

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