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參數資料
| 型號： | LMX4268 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Radio Transceiver for DECT |
| 中文描述： | 無線電收發器面向DECT |
| 文件頁數： | 1/4頁 |
| 文件大?。?/td> | 39K |
| 代理商： | LMX4268 |
L
2004 National Semiconductor Corporation
www.national.com
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’s SC144XX DCT family of base-
band processors.
The LMX4268 integrates a complete transmitter, consisting
of a phase locked loop, VCO and PA driver. The receiver
contains LNA, quadrature downconverter, polyphase filter,
automatic gain control and demodulator.
The LMX4268 operates from a single 2.5V supply. The
LMX4268 is manufactured in National’s 0.25
μ
m CMOS
technology, and is packaged in a 44 pin LLP package.
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
3.0 Applications
■
(DCT) Digital Cordless Telecommunications
4.0 System Diagram
TX DATA
RX DATA
RSSI
DATA
CLOCK
LE
AGC
0°
90°
DEMOD.
PA
BIAS
PLL
R_REF
PADR
MICROWIRE
LNA
BALUN
BALUN
PORTS
X2
MGA
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