ISL3685 Datasheet, PDF (1/19 Pages) Intersil Corporation – 2.4GHz RF/IF Converter and Synthesizer

TM
Data Sheet
ISL3685
January 2001 File Number 4860.2
2.4GHz RF/IF Converter and Synthesizer
The ISL3685 is a monolithic SiGe
half duplex RF/IF transceiver
designed to operate in the 2.4GHz
ISM band. The receive chain features
a low noise, gain selectable amplifier (LNA) followed by a
down-converter mixer. An up-converter mixer and a high
performance preamplifier compose the transmit chain. The
remaining circuitry comprises a high frequency Phase
Locked Loop (PLL) synthesizer with a three wire
programmable interface for local oscillator applications.
A reduced filter count is realized by multiplexing the receive
and transmit IF paths and by sharing a common differential
matching network. Furthermore, both transmit and receive
RF amplifiers can be directly connected to mixers as
bandwidth characteristics attenuate image frequencies. The
inherent image rejection of both the transmit and receive
functions allows this economic advantage.
The ISL3685 is housed in a 44 lead MLFP package well
suited for PCMCIA board and MINI PCI applications.
Ordering Information
PART NUMBER
ISL3685IR
ISL3685IR96
TEMP RANGE
(^oC)
PACKAGE PKG. NO
-40 to 85 44 Ld MLFP L44.7x7
-40 to 85 Tape and Reel
Simplified Block Diagram
RX_IN
CP_DO
INTERFACE
REF_IN
TXA_OUT
PLL
MODULE
RX_MX_OUT
LO_IN
TX_MX_IN
Features
• Highly Integrated
• Multiplexed RX/TX IF Path prescribes Single IF Filter
• Programmable Synthesizer
• Gain Selectable LNA
• Power Management/Standby Mode
• Single Supply 2.7V to 3.3V Operation
Cascaded LNA/Mixer (High Gain)
• Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25dB
• SSB Noise Figure. . . . . . . . . . . . . . . . . . . . . . . . . . . 3.7dB
• Input IP3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -12dBm
• IF Frequency . . . . . . . . . . . . . . . . . . . 280MHz to 600MHz
Cascaded LNA/Mixer (Low Gain)
• Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -9dB
• Input P1dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +2.5dBm
• IF Frequency . . . . . . . . . . . . . . . . . . . 280MHz to 600MHz
Cascaded Mixer/Preamplifier
• Transmit Cascaded Mixer/Preamplifier Gain . . . . . . .25dB
• SSB Noise Figure. . . . . . . . . . . . . . . . . . . . . . . . . . . .10dB
• Output P1dB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4dBm
• IF Frequency . . . . . . . . . . . . . . . . . . . 280MHz to 600MHz
Applications
• IEEE802.11 1Mbps and 2Mbps Standard
• Systems Targeting IEEE802.11, 11Mbps Standard
• Wireless Local Area Networks
• PCMCIA Wireless Transceivers
• ISM Systems
• TDMA Packet Protocol Radios
• MINI PCI Wireless Transceivers
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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PRISM® is a registered trademark of Intersil Americas Inc. PRISM and design is a trademark of Intersil Americas Inc.