®
ISL3084
Data Sheet
May 2003
FN5042.3
5GHz VCO
The ISL3084 is a 5GHz SiGe
monolithic VCO circuit designed to
simplify and reduce the cost and size
of miniature wireless transceivers.
A fully integrated VCO requiring no external elements such
as inductors and varactors greatly simplifies low cost local
oscillator synthesized applications.
Included in this differential design is a low-power standby
function and a stable process and temperature biasing
operation.
The ISL3084 is housed in a 16 lead QFN package
well-suited for PCMCIA and miniPCI board applications.
Features
• Single Supply . . . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 3.3V
• Frequency . . . . . . . . . . . . . . . . . . . . . . . . . 4.9GHz typical
• Fully Integrated/No External Varactors or Resonators
Required
• Isolation Output Buffer/Reduced Load Pulling
• Differential Design/Reduced Spurs
• Digitally Controlled Power Down Mode
• QFN Package:
- Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat
No Leads - Package Outline
- Near Chip Scale Package footprint, which improves
PCB efficiency and has a thinner profile
Pinout
FILTER CAP 2
ISL3084 (QFN)
TOP VIEW
FILTER CAP 1
Applications
• Systems Targeting IEEE802.11b, 11Mbps Standard
• Only required VCO function for Intersil PRISM3 chip set
• WLAN Applications.
GND
GND
• PCMCIA Wireless Transceivers
• TDMA Packet Protocol Radios
12 VCC
16
VTUNE 1
15
14
13
Simplified Block Diagram
VCC
VCC
VCO
BIAS
VCC
OSC+
OSC-
VTUNE
VCC 2
11 OSC+
GND 3
10 OSC-
PE
GND 4
5
PE
6
VCC
7
GND
8
GND
9 GND
GND
GND
GND
Ordering Information
PART NUMBER TEMP. RANGE (
o
C)
ISL3084IR
ISL3084IR-TK
-40 to 85
-40 to 85
PACKAGE
16 Ld QFN
Tape and Reel
PKG. NO.
L16.4x4
Pin Descriptions
PIN NUMBER
1
2, 6, 12
5
10
11
15
16
3, 4, 7, 8, 9, 13, 14
Paddle
NAME
VTUNE
VCC
PE
OSC-
OSC+
FILTER CAP1
FILTER CAP2
GND
N/A
DESCRIPTION
Input tuning voltage from loop filter. Sensitivity to external injected noise to KVCO. Careful noise-free
layout recommended.
Supply pins. Requires high quality capacitor RF decoupling. Phase noise behavior proportional to supply
pushing specifications. Use good quality, low-frequency decoupling/filtering techniques.
Power enable control pin: VCO enabled high.
Differential VCO output. Terminate into 100Ω differential impedance. Terminate one end into 50Ω when
single end output with equivalent loss of power.
Use high quality .68
µ
F filter capacitor to ground.
Use high quality .68
µ
F filter capacitor to VCC.
Ground
Floating paddle. Grounding is recommended.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2003. All Rights Reserved. All other trademarks mentioned are the property of their respective owners.
PRISM® is a registered trademark of Intersil Americas Inc. PRISM and design is a trademark of Intersil Americas Inc.
INTERSIL [ INTERSIL CORPORATION ]
