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| Preliminary RF2506 VHF/UHF VCO/HIGH-ISOLATION BUFFER AMPLIFIER 12 Typical Applications * Low Voltage * Wireless LANs * IF LO for 2.45GHz ISM Band Systems * Wireless Local Loop * Digital Cordless Phones Product Description The RF2506 is an integrated oscillator and buffer amplifier chain designed to achieve low sensitivity to fluctuations in load impedance and power supply noise, while maintaining superior phase noise performance. The IC offers great flexibility, yet is easy to use. This product was designed for use in applications with low supply voltages. It has a power-down feature and is designed to operate from 10MHz to 1000MHz with the help of an external resonator. Frequency control is achieved with an external varactor diode. The IC's ease of use, reduced load pulling, small size, and low cost make it an ideal LO (Local Oscillator) for wireless applications in the VHF/UHF range. The RF2506 was designed to operate with the 2.4GHz chipset; specifically with the IF portion of the RF2518 PLL/synthesizer. Optimum Technology Matching(R) Applied Si BJT GaAs HBT SiGe HBT GaAs MESFET Si CMOS 0.192 + 0.008 0.012 0.006 + 0.003 A 0.0256 0.118 + 0.004 sq. 6 MAX 0 MIN 0.021 + 0.004 0.006 + 0.002 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". Package Style: MSOP-8 uSi Bi-CMOS Features * High-Isolation/Reduced Load Pulling * Low Current Consumption * -7dBm Output Power 12 PLLs and VCOs VCC1 GND1 FDBK VTUNE 1 2 3 4 8 7 6 5 PD VCC2 GND2 RF OUT * Digitally Controlled Power Down Mode * 10MHz to 1GHz Operating Range * Single 2.7V to 3.6V Supply Ordering Information RF2506 RF2506 PCBA VHF/UHF VCO/High-Isolation Buffer Amplifier 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 A1 000908 12-9 RF2506 Absolute Maximum Ratings Parameter Supply Voltage Power Down Voltage (VPD) Operating Ambient Temperature Storage Temperature Preliminary Rating -0.5 to +5.8 -0.5 to +5.8 -40 to +85 -55 to +150 Unit VDC VDC 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 Operating Frequency Specification Min. Typ. Max. 10 to 1000 Unit MHz Condition 560MHz Operation Output Power 2nd Harmonic 3rd Harmonic Load Pulling VCC Pushing Phase Noise -3 -27 -35 50 190 -110 dBm dBc dBc kHzP-P kHz/V dBc T=25 C, VCC =2.7V, ZLOAD =50, VPD =2.7V, O/P terminated into LC. Characterized @ 560MHz as per eval board. Data will change depending on frequency of operation and resonant tank network. -90 dBc 560MHz Operation Output Power 2nd Harmonic 3rd Harmonic Load Pulling VCC Pushing Phase Noise -7 -11.5 -15.5 35 160 -107 dBm dBc dBc kHzP-P kHz/V dBc Into 1.75 VSWR Load Supply sweep from 2.7V to 3.2V 100kHz Offset. Better phase noise is achievable by increasing the loaded Q of the resonator circuit. 10kHz Offset T=25 C, VCC =2.7V, ZLOAD =50, VPD =2.7V, O/P terminated in 50. Characterized @ 560MHz as per eval board. Data will change depending on frequency of operation and resonant tank network. 12 PLLs and VCOs -88 dBc VDC mA Into 1.75 VSWR Load Supply sweep from 2.7V to 3.2V 100kHz Offset. Better phase noise is achievable by increasing the loaded Q of the resonator circuit. 10kHz Offset At 2.2V and -40C, output power will be reduced to typically -11dBm. Power Supply Operating Voltage Supply Current 2.7 to 3.6 9 12-10 Rev A1 000908 Preliminary Pin 1 Function VCC1 Description RF2506 Interface Schematic Power supply connection for the VCO. This pin should be well bypassed close to the package with a capacitor suitable for the frequency of operation as well as a capacitor to minimize low frequency noise from the voltage supply. The ground side of the capacitors should connect immediately to ground plane. Ground connection for the VCO. Keep traces physically short and con- See pin 2. nect immediately to ground plane for best performance. In order to minimize load pulling, it is recommended that pin 2 has a different return path to ground than pin 6 (i.e., separate vias to a common ground plane). Feedback output to resonant circuit. A Colpitts oscillator is formed by See pin 4. placing a capacitor from this pin to pin 4 and from this pin to ground. A DC blocking capacitor, suitable for the frequency of operation, should be used if the external circuitry has DC present or presents a DC path to ground. See the application schematic of this data sheet for design details. Tank circuit input. A resonant circuit is placed from this pin to ground. To Bias Ckts. The capacitive side is tapped to the FDBK point and the inductive side includes a varactor for voltage tuning to provide the VCO function. A DC blocking capacitor, suitable for the frequency of operation, should be used if the external circuitry has DC present or presents a DC path VTUNE to ground. See the application schematic of this data sheet for design FDBK details. 2 GND1 3 FDBK 4 VTUNE To Buffer Amps and Bias Ckts. GND1 5 RF OUT 6 GND2 7 VCC2 Rev A1 000908 12-11 PLLs and VCOs 8 PD RF output pin. This is an open-collector output and must be biased externally. A shunt bias/matching inductor to VCC and a series blocking/ matching capacitor are recommended. See Application Example Schematic. Ground connection for the buffer amplifiers. Keep traces physically short and connect immediately to ground plane for best performance. In order to minimize load pulling, it is recommended that pin 2 has a different return path to ground than pin 6 (i.e., separate vias to a common ground plane). Power supply connection for the buffer amplifiers. This pin should be well bypassed close to the package with a capacitor suitable for the frequency of operation. The ground side of the capacitor should connect immediately to ground plane. Power Down pin for the VCO and buffer amplifiers. A logic "low" (0.0 to 0.7V) turns the entire device off and supply current drops to less than 1A. A logic "high" (3.0V) turns the device on. Note that the voltage on this pin should never exceed 5.5VDC. 12 RF2506 Application Schematic PD C13 100 pF 1 C2 10 pF C1 10 pF 2 3 R1 47 k VTUNE C6 100 pF D1 SMV 1249-011 L1 27 nH C8 4 pF 4 8 7 6 5 VCC C7 10 pF C3 100 pF Preliminary VCC C4 100 pF VCC C5 100 pF RF OUT L2 8.2 nH C11 + 10 uF Evaluation Board Schematic (Download Bill of Materials from www.rfmd.com.) P1 P1-1 C12 10 nF C10 + 10 uF P1-3 1 2 3 CON3 VCC C13 100 pF 1 C2 10 pF C8 4 pF C9* 10 pF C1 10 pF 2 3 4 8 7 6 5 C7 10 pF 2506400- P2 VCC GND PD P2-1 1 2 CON3 VTUNE GND PD C4 100 pF 12 PLLs and VCOs R1 47 k VTUNE C6 100 pF D1 SMV1249 -011 VCC C5 100 pF L2 8.2 nH + C11 10 uF C3 100 pF L1 27 nH 50 strip J1 RF OUT VCC *Not Populated 12-12 Rev A1 000908 Preliminary Evaluation Board Layout 900MHz Board Size 1.404" x 0.986" Board Thickness 0.031", Board Material FR-4 RF2506 12 PLLs and VCOs Rev A1 000908 12-13 RF2506 Preliminary 12 PLLs and VCOs 12-14 Rev A1 000908 |
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