參數(shù)資料
型號(hào): LMX2411
廠商: National Semiconductor Corporation
元件分類: 基帶處理器
英文描述: Baseband Processor for Radio Communications
中文描述: 基帶處理器的無線電通信
文件頁(yè)數(shù): 1/10頁(yè)
文件大小: 162K
代理商: LMX2411
TL/W/11911
L
PRELIMINARY
September 1993
LMX2411
Baseband Processor for Radio Communications
General Description
The LMX2411 is a monolithic, integrated baseband proces-
sor suitable for use in Digital European Cordless Telecom-
munications (DECT) systems as well as other mobile teleph-
ony and wireless communications applications. It is fabricat-
ed using National’s ABiC IV BiCMOS process (f
T
15 GHz).
e
The LMX2411 contains both transmit and receive functions.
The transmitter utilizes a low power, high speed digital-to-
analog converter (DAC) and a mask programmable Read
Only Memory (ROM) to generate a Gaussian filter pulse
shape. The receiver includes a high speed, low power volt-
age comparator for making hard decisions on incoming data
and a CMOS switch coupled with a sample and hold circuit
for DC compensation. Supply voltage can range from 2.85V
to 3.6V. The LMX2411 features very low current consump-
tion of 2.5 mA transmit and 5 mA receive (steady state). It
also has separate power down pins for transmit and receive
functions to further reduce power consumption.
The LMX2411 can be used with the LMX2216B LNA/Mixer,
the LMX2240 IF Receiver, and the LMX2320 Phase-Locked
Loop to form a complete RF front end solution. These chips
form the major blocks of an RF front end solution for DECT.
The LMX2411 is available in a 16-pin JEDEC surface mount
plastic package.
Features
Y
High speed voltage comparator (40 ns settling time)
Y
Generates Gaussian filtered modulating signal for a di-
rect VCO modulator
Y
Bit rates to 1.152 Mb/s (DECT)
Y
Supports 10.368, 13.824, and 18.432 MHz system
clocks through pin selection
Y
On-chip DC compensation circuit
Y
Average current consumption 0.6 mA for DECT handset
(burst mode operation)
Y
Power down mode for extended battery life
Y
Compatible with Sierra SC14400 and Philips PCD5040
DECT Burst Mode Controllers
Applications
Y
Digital European Cordless Telecommunications (DECT)
Y
Portable wireless communications (PCS/PCN, cordless)
Y
Wireless local area networks (WLANs)
Y
Other wireless communications systems
This data sheet contains the design specifications for product development.
Specifications may change in any manner without notice.
Functional Block Diagram
TL/W/11911–1
TRI-STATE
é
is a registered trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation
RRD-B30M115/Printed in U. S. A.
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