LMX4268 Radio Transceiver for DECT
ADVANCED INFORMATION
March 2004
LMX4268
Radio Transceiver for DECT
1.0 General description
The LMX4268 is a radio transceiver integrated circuit opti-
mized for the Digital Cordless Telecommunications (DCT)
system. The transceiver, when combined with a power
amplifier and a Tx/Rx switch, implements a complete
2.4GHz ISM band digital radio transceiver compliant with
the FCC rules part 15. The LMX4268 interfaces directly to
National Semiconductor鈥檚 SC144XX DCT family of base-
band processors.
2.0 Features
Fully integrated 2.4 GHz CMOS low-IF transceiver
Low power consumption
On-chip Voltage Controlled Oscillator (VCO)
On-chip low noise amplifier (LNA)
Open-loop modulation
On chip Modulation Gain Amplifier (MGA)
On-chip timing control
Four digital (5 mA) output ports
0 dBm PA driver output
dual bit rate 0.576 MHz (LR
b
) / 1.152 MHz (HR
b
)
sensitivity -96 dBm (LR
b
) / -93 dBm (HR
b
)
2.5V operation
Small 44 pin Leadless Leadframe Package
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The LMX4268 integrates a complete transmitter, consisting
of a phase locked loop, VCO and PA driver. The receiver
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contains LNA, quadrature downconverter, polyphase filter,
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automatic gain control and demodulator.
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The LMX4268 operates from a single 2.5V supply. The
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LMX4268 is manufactured in National鈥檚 0.25碌m CMOS
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technology, and is packaged in a 44 pin LLP package.
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3.0 Applications
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(DCT) Digital Cordless Telecommunications
4.0 System Diagram
AGC
DEMOD.
BALUN
LNA
RSSI
0擄
90擄
DATA
MICROWIRE
PA
BALUN
PADR
X2
CLOCK
LE
RX DATA
PORTS
MGA
PLL
BIAS
TX DATA
R_REF
漏
2004 National Semiconductor Corporation
www.national.com
LMX4268相關型號PDF文件下載
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英文版
Radio Transceiver for DECT
NSC
-
英文版
Radio Transceiver for DECT
NSC [Natio...
-
英文版
Radio Transceiver for DECT
NSC
-
英文版
Radio Transceiver for DECT
NSC [Natio...
-
英文版
Radio Transceiver for DECT
NSC
-
英文版
Radio Transceiver for DECT
NSC [Natio...
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