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| Preliminary RF2459 3V PCS DOWNCONVERTER 8 Typical Applications * CDMA/TDMA/DCS1900 PCS Systems * PHS 1500/WLAN 2400 Systems * General Purpose Downconverter * Micro-Cell PCS Base Stations * Portable Battery-Powered Equipment Product Description The RF2459 is a monolithic integrated downconverter for PCS, PHS, and WLAN applications. The IC contains all of the required components to implement the RF functions of the downconverter. It contains a double-balanced Gilbert cell mixer and a balanced IF output. The mixer's high third-order intercept point makes it ideal for digital cellular applications. The IC is designed to operate from a single 3V power supply. 6 MAX 0 MIN 0.192 + 0.008 0.012 0.006 + 0.003 -A- 0.0256 0.118 + 0.004 sq. 0.034 NOTES: 1. Shaded lead is pin 1. 2. All dimensions are exclusive of flash, protrusions or burrs. 3. Lead coplanarity: 0.002 with respect to datum "A". 8 FRONT-ENDS 0.021 + 0.004 0.006 + 0.002 Optimum Technology Matching(R) Applied Si BJT Si Bi-CMOS u Package Style: MSOP-8 GaAs HBT SiGe HBT GaAs MESFET Si CMOS Features * Extremely High Dynamic Range * Single 3V Power Supply * 1500MHz to 2500MHz Operation LO IN GND2 VCC GND1 1 2 3 4 8 7 6 5 IF+ IFGND3 RF IN Ordering Information RF2459 RF2459 PCBA 3V PCS Downconverter 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 A2 010717 8-97 RF2459 Absolute Maximum Ratings Parameter Supply Voltage Input LO and RF Levels Ambient Operating Temperature Storage Temperature Preliminary Ratings -0.5 to 7.0 +6 -40 to +85 -40 to +150 Unit VDC dBm C C Caution! ESD sensitive device. RF Micro Devices believes the furnished information is correct and accurate at the 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 Usable RF Frequency Range Typical RF Frequency Range Usable LO Frequency Range Typical LO Frequency Range IF Frequency Range Noise Figure Input VSWR Input IP3 Gain Output Impedance Specification Min. Typ. Max. 1500 1930 to 1990 1200 1430 to 1990 DC to 500 14 <2:1 +5.0 8 +7.0 10 1000 -7.5 -5 to +3 30 40 <2:1 2500 2500 Unit Condition T = 25C, VCC =3.0V, RF=1960MHz, LO=1750MHz@-2dBm MHz MHz MHz MHz MHz dB Single-ended with external matching network. dBm dB dBm dBm dB dB Single-ended with external matching network. 8 FRONT-ENDS Single-ended with external matching network. Input P1dB LO Input LO Input Range LO to RF (Mix In) Rejection LO to IF LO Input VSWR Power Supply Voltage Current Consumption 2.7 3.0 20 3.6 26 V mA 8-98 Rev A2 010717 Preliminary Pin 1 Function LO IN Description Mixer LO single-ended input. The pin is internally DC blocked. External matching sets impedance. RF2459 Interface Schematic LO IN 2 3 4 5 GND2 VCC GND1 RF IN Ground for downconverter. Keep traces physically short and connect directly to ground plane for best performance. Supply voltage for downconverter. External RF bypassing is required. The trace length between the bypass caps and the pin should be minimized. Connect ground sides of caps directly to ground. Same as pin 2. Mixer RF single-ended input. The pin is internally DC blocked. External matching sets input impedance. RF IN 6 7 GND3 IF- Same as pin 2. IF output pin. The output is balanced. A current combiner external network performs a differential to single-ended conversion and sets the output impedance. There must be a DC path from VCC to this pin. this is normally achieved with the current combiner network. A DC blocking cap must be present if the IF filter input has a DC path to ground. Same as pin 7, except complementary output. IF+ IF- 8 IF+ 8 FRONT-ENDS Rev A2 010717 8-99 RF2459 Application Schematic VCC Preliminary L2 L1 C2 IF Filter IF OUT C1 R C1 4.7 nH LO IN 1.5 pF VCC 1 2 3 4 8 7 6 5 1.5 pF RF IN 2.2 nH 100 nF 22 pF 8 FRONT-ENDS Output Interface Network L1, C1 and R form a current combiner which performs a differential to single-ended conversion at the IF frequency and sets the output impedance. In most cases, the resonance frequency is independent of R and can be set according to the following equation: fIF = 1 L1 2 (C1 + C EQ) 2 where ROUT is the desired output impedance and RP is the parasitic equivalent parallel resistance of L1. C1 should be chosen as high as possible, while maintaining an RP of L1 that allows for the desired ROUT. L2 and C2 serve dual purposes. L2 serves as an output bias choke, and C2 serves as a series DC block. In addition, L2 and C2 may be chosen to form an impedance matching network if the input impedance of the IF filter is not equal to ROUT. Otherwise, L2 is chosen to be large (suggested 8.2nH) and C2 is chosen to be large (suggested 22nF) if a DC path to ground is present in the IF filter, or omitted if the filter is DC blocked. Where CEQ is the equivalent stray capacitance and capacitance looking into pins 7 and 8. An average value to use for CEQ is 2.5pF. R can then be used to set the output impedance according to the following equation: R= 1 (4 R -1 OUT RP ) -1 8-100 Rev A2 010717 Preliminary Evaluation Board Schematic RF=1.959MHz, IF=210MHz (Download Bill of Materials from www.rfmd.com.) VCC P1 1 2 3 CON3 L1 4.7 nH 1 C1 1.5 pF VCC C2 100 nF C3 22 pF 2 3 4 8 7 6 5 L2 2.2 nH NOTES: 1) R1, L3, C5, and C6 are chosen to produce an output impedance, ROUT, of 1000 @ 210 MHz. 2) L4 and C7 are chosen to match the 1000 output impedance to 50 for testing purposes. VCC GND N/C C5 9 pF L3 100 nH L4 180 nH C6 9 pF C7 4 pF RF2459 50 strip J3 IF OUT R1 16k J1 LO IN 50 strip C4 1.5 pF 50 strip J2 RF IN 8 FRONT-ENDS Rev A2 010717 8-101 RF2459 Evaluation Board Layout 900MHz Board Size 2.0" x 2.0" Board Thickness 0.031", Board Material FR-4 Preliminary 8 FRONT-ENDS 8-102 Rev A2 010717 Preliminary MIXIN VSWR versus VCC 1.95 MIXin, -30 MIXin, 25 1.90 MIXin, 85 1.40 1.45 RF2459 LOIN VSWR versus VCC 1.85 MIXIN VSWR 1.35 1.80 LOIN 1.30 1.25 1.75 1.70 Loin, -30 Loin, 25 Loin, 85 1.65 2.70 2.80 2.90 3.00 3.10 3.20 3.30 3.40 3.50 3.60 1.20 2.70 2.80 2.90 3.00 3.10 3.20 3.30 3.40 3.50 3.60 VCC (V) VCC (V) NF versus VCC 17.0 13.0 Gain versus VCC 16.0 12.0 8 15.0 11.0 Noise Figure Gain (dB) 14.0 10.0 13.0 9.0 12.0 NF, -30 NF, 25 NF, 85 8.0 Gain, -30 Gain, 25 Gain, 85 11.0 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 7.0 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 VCC (V) VCC (V) ICC versus VCC 30.0 15.0 IIP3 versus VCC 13.0 25.0 11.0 20.0 IIP3 (dBm) ICC (mA) 9.0 7.0 15.0 Icc, -30 Icc, 25 Icc, 85 10.0 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 5.0 IIP3, -30 IIP3, 25 IIP3, 85 3.0 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 VCC (V) VCC (V) Rev A2 010717 8-103 FRONT-ENDS RF2459 IP1dB versus VCC -4.0 14.0 Gain, -30 Gain, 25 -5.0 13.0 Gain, 85 Preliminary Gain versus LO PIN VCC = 3.0 V 12.0 -6.0 IP1dB (dBm) Gain (dB) IP1dB, -30 IP1dB, 25 IP1dB, 85 11.0 -7.0 10.0 -8.0 9.0 -9.0 8.0 -10.0 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 7.0 -6.0 -4.0 -2.0 0.0 2.0 4.0 VCC (V) LO PIN (dBm) IIP3 versus LO PIN 14.0 IP1dB versus LO PIN -5.0 IIP3, -30 IIP3, 25 IIP3, 85 VCC = 3.0 V VCC = 3.0 V IP1dB, -30 IP1dB, 25 IP1dB, 85 12.0 -6.0 8 FRONT-ENDS IIP3 (dBm) 10.0 -7.0 8.0 IP1dB (dBm) -4.0 -2.0 0.0 2.0 4.0 -8.0 6.0 -9.0 4.0 -10.0 2.0 -11.0 0.0 -6.0 -12.0 -6.0 -4.0 -2.0 0.0 2.0 4.0 LO PIN (dBm) LO PIN (dBm) 8-104 Rev A2 010717 |
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