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LMX2240M bảng dữ liệu(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện LMX2240M
Giải thích chi tiết về linh kiện  Intermediate Frequency Receiver
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TLW11755
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 ABiCTM IV BiCMOS
process (fT 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 25 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 b75 dBm RSSI sensitivity to
b
82 dBm
Y
High gain (70 dB) limiting amplifier
Y
Average current consumption 480 mA 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
LNAMixer the LMX231520 Phase-locked Loop and
the LMX2411 Baseband Processor
Y
Compliant to ARi1TM specification
Applications
Y
Digital European Cordless Telecommunications (DECT)
Y
Portable wireless communications (PCSPCN cordless)
Y
Wireless local area networks (WLANs)
Y
Digital cellular telephone systems
Y
Other wireless communications systems
Functional Block Diagram
TLW11755 – 1
ABiCTM and ARi1TM are trademarks of National Semiconductor Corporation
C1995 National Semiconductor Corporation
RRD-B30M115Printed in U S A


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