Datasheet RF2506, RF2506PCBA Datasheet (RF Micro Devices)

12-9

12

PLLs and VCOs

Preliminary

Product Description

Ordering Information

Typical Applications

Features

Functional Block Diagram

RF Micro Devices, Inc.
7628 ThorndikeRoad
Greensboro,NC 27409, USA

Tel [phone]

Fax [phone]

http://www.rfmd.com

Optimum Technology Matching® Applied

Si BJT GaAs MESFETGaAs HBT
Si Bi-CMOS

ü

SiGe HBT

Si CMOS

8PD

7 VCC2

6 GND2

5 RF OUT4VTUNE

3FDBK

2GND1

1VCC1

RF2506

VHF/UHF VCO/HIGH-ISOLATION

BUFFER AMPLIFIER

• Low Voltage

•WirelessLANs

• IF LO for 2.45GHz ISM Band Systems

• Wireless Local Loop

• Digital Cordless Phones

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

2.4 GHz chipset; specifically with the IF portion of the
RF2518 PLL/synthesizer.

• High-Isolation/Reduced Load Pulling

• Low Current Consumption

• -7dBm Output Power

• Digitally Controlled Power Down Mode

• 10MHz to 1GHz Operating Range

• Single 2.7V to 3.6V Supply

RF2506 VHF/UHF VCO/High-Isolation Buffer Amplifier
RF2506 PCBA Fully Assembled Evaluation Board

12

Rev A1 000908

0.006

+ 0.003

0.034

6° MAX

0° MIN

0.021

+ 0.004

0.006

+ 0.002

NOTES:

1. Shaded lead is pin 1.

2. All dimensions are exclusive offlash,
protrusions or burrs.

3. Lead coplanarity: 0.002 with respect
to datum "A".

A

0.192

+ 0.008

0.0256

0.012

0.118

+ 0.004sq.

Package Style: MSOP-8

Preliminary

12-10

RF2506

Rev A1 000908

12

PLLs and VCOs

Absolute Maximum Ratings

Parameter Rating Unit

Supply Voltage -0.5 to +5.8 V

DC

Power Down Voltage (VPD)-0.5to+5.8V

DC

Operating Ambient Temperature -40 to +85 °C
Storage Temperature -55 to +150 °C

Parameter

Specification

Unit Condition

Min. Typ. Max.

Overall

Operating Frequency 10 to 1000 MHz

560MHz Operation

T=25 °C, VCC=2.7V, Z

LOAD

=50Ω,

V

PD

=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.
Output Power -3 dBm
2nd Harmonic -27 dBc
3rd Harmonic -35 dBc
Load Pulling 50 kHz

P-P

Into 1.75 VSWR Load
V

CC

Pushing 190 kHz/V Supply sweep from 2.7V to 3.2V

Phase Noise -110 dBc 100kHz Offset. Better phase noise is achiev-

able by increasing the loaded Q of th e reso-

nator circuit.

-90 dBc 10 kHz Offset

560MHz Operation

T=25 °C, VCC=2.7V, Z

LOAD

=50Ω,

V

PD

=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.
Output Power -7 dBm
2nd Harmonic -11.5 dBc
3rd Harmonic -15.5 dBc
Load Pulling 35 kHz

P-P

Into 1.75 VSWR Load
V

CC

Pushing 160 kHz/V Supply sweep from 2.7V to 3.2V

Phase Noise -107 dBc 100kHz Offset. Better phase noise is achiev-

able by increasing the loaded Q of th e reso-

nator circuit.

-88 dBc 10 kHz Offset

Power Supply

Operating Voltage 2.7 to 3.6 V

DC

At 2.2V and -40 °C,output power will be

reduced to typically -11dBm.
Supply Current 9 mA

Caution! ESD sensitive device.

RF Micro Devices believes the furnished information is correct and accurate
at thetime 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).

Preliminary

12-11

RF2506

Rev A1 000908

12

PLLs and VCOs

Pin Function Description Interface Schematic

1VCC1

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 thevoltage supply.The ground side of the capacitors should
connect immediately to ground plane.

2GND1

Ground connection for the VCO. Keep traces physically short and con­nect immediately to ground plane for best performance. In order tomin­imize 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).

See pin 2.

3 FDBK

Feedback output to resonant circuit. A Colpitts oscillator is formed by
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.

See pin 4.

4 VTUNE

Tank circuit input. A resonant circuit is placed from this pin to ground.
The capacitive side is tapped to the FDBK point and the inductive side
includes a varactor for voltage tuning to provide the VC O 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
to ground. See the application schematic of this data sheet for design
details.

5RFOUT

RF output pin. This is an ope n-collector output and must be biased
externally.A shunt bias/matching inductor to V

CC

and a series blocking/

matching capacitor are recommended. See Application Example Sche­matic.

6GND2

Ground connection for the buffer amp lifiers. Keep traces physically
short and connec t immediately to ground plane for best performance.
In order to minimize load pulling, iti s recomm ended that pin 2 has a dif­ferent return path to ground than pin 6 (i.e.,separate vias to a common
ground plane).

7VCC2

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.

8PD

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 5.5V

DC

.

VTUNE

To Bias Ckts.

To Buffer Amps

and Bias Ckts.

FDBK

GND1

Preliminary

12-12

RF2506

Rev A1 000908

12

PLLs and VCOs

Applicatio n Schematic

Evaluation Board Schema t ic

(Download Bill of Materials from www.rfmd.com.)

8

7

6

54

3

2

1

C13

100 pF

C4

100 pF

PD

C1

10 pF

C2

10 pF

C8

4pF

C6

100 pF

L1

27 nH

R1

47 k

Ω

VTUNE

D1

SMV

1249-011

C7

10 pF

L2

8.2 nH

C5

100 pF

RF OUT

V

CC

V

CC

V

CC

C11

10 uF

+

C3

100 pF

8

7

6

54

3

2

1

C4

100 pF

PD

VCC

C7

10 pFL28.2 nH

C5

100 pF

50Ωµstrip

J1

RF OUT

VCC

C3

100 pF

C11

10 uF

+

C13

100 pF

C1

10 pF

C2

10 pF

C8

4pF

C9*

10 pF

L1

27 nH

D1

SMV1249

-011

R1

47 k

Ω

C6

100 pF

VTUNE

VCC

P1

1
2
3

CON3

P1-3 PD

GND

VCCP1-1

C10

10 uF

+

C12

10 nF

P2

1
2

CON3

GND

P2-1 VTUNE

*Not Populated

2506400-

Preliminary

12-13

RF2506

Rev A1 000908

12

PLLs and VCOs

Evaluation Board Layout 900MHz

Board Size 1.404" x 0.986"

Board Thickness 0.031”, Board Material FR-4

Preliminary

12-14

RF2506

Rev A1 000908

12

PLLs and VCOs