View RF2506_416861.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

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

▲Up To Search▲

Price & Availability of RF2506

	To Download RF2506 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .