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參數資料
| 型號： | LMX2240M |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 通信及網絡 |
| 英文描述： | Intermediate Frequency Receiver |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO16 |
| 封裝： | PLASTIC, SOP-16 |
| 文件頁數： | 1/12頁 |
| 文件大小： | 208K |
| 代理商： | LMX2240M |
TL/W/11755
L
April 1995
LMX2240
Intermediate Frequency Receiver
General Description
The LMX2240 is a monolithic, integrated intermediate fre-
quency receiver suitable for use in Digital European Cord-
less Telecommunications (DECT) systems as well as other
mobile telephony and wireless communications applica-
tions. It is fabricated using National’s ABiC
TM
IV BiCMOS
process (f
T
e
15 GHz).
The LMX2240 consists of a high gain limiting amplifier, a
frequency discriminator, and a received signal strength indi-
cator (RSSI). The high gain limiting amplifier and discrimina-
tor operate in the 40 MHz to 150 MHz frequency range, and
the limiter has approximately 70 dB of gain. The use of the
limiter and the discriminator provides a low cost, high per-
formance demodulator for communications systems. The
RSSI output can be used for channel quality monitoring.
The LMX2240 is intended to support single conversion re-
ceivers. This device saves power, size, and cost by eliminat-
ing the second local oscillator (LO), second converter (mix-
er), and additional filters. The LMX2240 is recommended for
systems with channel bandwidths of 300 kHz to 2.5 MHz.
The LMX2240 is available in a 16-pin JEDEC surface mount
plastic package.
Features
Y
Typical operation at 110 MHz
Y
RF sensitivity to
b
75 dBm; RSSI sensitivity to
b
82 dBm
Y
High gain (70 dB) limiting amplifier
Y
Average current consumption: 480
m
A for DECT
handset (burst mode)
Y
a
3V operation
Y
Power down mode for increased current savings
Y
Part of a complete receiver solution with the LMX2216
LNA/Mixer, the LMX2315/20 Phase-locked Loop, and
the LMX2411 Baseband Processor
Y
Compliant to ARi
1
TM
specification
Applications
Y
Digital European Cordless Telecommunications (DECT)
Y
Portable wireless communications (PCS/PCN, cordless)
Y
Wireless local area networks (WLANs)
Y
Digital cellular telephone systems
Y
Other wireless communications systems
Functional Block Diagram
TL/W/11755–1
ABiC
TM
and ARi
1
TM
are trademarks of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation
RRD-B30M115/Printed in U. S. A.
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相關代理商/技術參數 |
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| LMX2301 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinumTM 160 MHz Frequency Synthesizer for RF Personal Communications |
| LMX2301TM | 制造商:Texas Instruments 功能描述: |
| LMX2301TMX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinumTM 160 MHz Frequency Synthesizer for RF Personal Communications |
| LMX2305 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinumTM 550 MHz Frequency Synthesizer for RF Personal Communications |
| LMX2305 WAF | 制造商:Texas Instruments 功能描述: |
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