RFMD RF2506

RF2506
Preliminary
12
VHF/UHF VCO/HIGH-ISOLATION
BUFFER AMPLIFIER
Typical Applications
• Low Voltage
• Wireless Local Loop
• Wireless LANs
• Digital Cordless Phones
• IF LO for 2.45GHz ISM Band Systems
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.
0.012
üSi Bi-CMOS
GaAs HBT
GaAs MESFET
SiGe HBT
Si CMOS
A
0.0256
0.118
+ 0.004 sq.
0.034
6° MAX
0° MIN
0.021
+ 0.004
Optimum Technology Matching® Applied
Si BJT
0.006
+ 0.003
0.192
+ 0.008
0.006
+ 0.002
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
Features
• High-Isolation/Reduced Load Pulling
12
PLLs and VCOs
• Low Current Consumption
• -7dBm Output Power
VCC1
1
8
PD
• Digitally Controlled Power Down Mode
GND1
2
7
VCC2
• 10MHz to 1GHz Operating Range
FDBK
3
6
GND2
• Single 2.7V to 3.6V Supply
VTUNE
4
5
RF OUT
Ordering Information
RF2506
RF2506 PCBA
Functional Block Diagram
Rev A1 000908
VHF/UHF VCO/High-Isolation Buffer Amplifier
Fully Assembled Evaluation Board
RF Micro Devices, Inc.
7628 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
12-9
RF2506
Preliminary
Absolute Maximum Ratings
Parameter
Supply Voltage
Power Down Voltage (VPD)
Operating Ambient Temperature
Storage Temperature
Parameter
Rating
Unit
-0.5 to +5.8
-0.5 to +5.8
-40 to +85
-55 to +150
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).
Specification
Min.
Typ.
Max.
Unit
10 to 1000
MHz
Condition
Overall
Operating Frequency
T=25 °C, VCC =2.7V, ZLOAD =50Ω,
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.
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
-90
dBc
-7
-11.5
-15.5
35
160
-107
dBm
dBc
dBc
kHzP-P
kHz/V
dBc
-88
dBc
2.7 to 3.6
VDC
9
mA
560MHz Operation
PLLs and VCOs
12
Output Power
2nd Harmonic
3rd Harmonic
Load Pulling
VCC Pushing
Phase Noise
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 =50Ω,
VPD =2.7V, O/P terminated in 50Ω.
Characterized @ 560MHz as per eval board.
Data will change depending on frequency of
operation and resonant tank network.
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
Power Supply
Operating Voltage
Supply Current
12-10
At 2.2V and -40°C, output power will be
reduced to typically -11dBm.
Rev A1 000908
RF2506
Preliminary
Pin
1
Function
VCC1
2
GND1
3
FDBK
4
VTUNE
Description
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.
To Buffer Amps
and Bias Ckts.
GND1
RF OUT
6
GND2
7
VCC2
8
PD
Rev A1 000908
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
1µA. A logic “high” (≥3.0V) turns the device on. Note that the voltage
on this pin should never exceed 5.5VDC.
12
PLLs and VCOs
5
12-11
RF2506
Preliminary
Application Schematic
PD
C13
100 pF
VCC
C4
100 pF
C2
10 pF
R1
47 kΩ
C1
10 pF
C8
4 pF
L1
27 nH
1
8
2
7
3
6
4
5
VTUNE
C5
100 pF
RF OUT
C7
10 pF
VCC
D1
SMV
1249-011
C6
100 pF
VCC
C11 +
10 uF
L2
8.2 nH
C3
100 pF
Evaluation Board Schematic
(Download Bill of Materials from www.rfmd.com.)
P1
P1-1
C12
10 nF
C10 +
10 uF
P1-3
P2
1
VCC
2
GND
3
PD
P2-1
1
VTUNE
2
GND
CON3
CON3
VCC
C13
100 pF
12
PLLs and VCOs
PD
C4
100 pF
C2
10 pF
R1
47 kΩ
L1
27 nH
C8
4 pF
C1
10 pF
VTUNE
C6
100 pF
D1
SMV1249
-011
C9*
10 pF
1
8
2
7
3
6
4
5
VCC
C5
100 pF
C7
10 pF
2506400-
50 Ω µstrip
J1
RF OUT
L2
8.2 nH
VCC
+ C11
10 uF
C3
100 pF
*Not Populated
12-12
Rev A1 000908
RF2506
Preliminary
Evaluation Board Layout 900MHz
Board Size 1.404" x 0.986"
Board Thickness 0.031”, Board Material FR-4
PLLs and VCOs
12
Rev A1 000908
12-13
RF2506
Preliminary
PLLs and VCOs
12
12-14
Rev A1 000908