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PDF LMX2240M Data sheet ( Hoja de datos )
| Número de pieza | LMX2240M | |
| Descripción | Intermediate Frequency Receiver | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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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 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 b75 dBm RSSI sensitivity to
b82 dBm
Y High gain (70 dB) limiting amplifier
Y Average current consumption 480 mA for DECT
handset (burst mode)
Y a3V 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 ARi1TM 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
ABiCTM and ARi1TM are trademarks of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL W 11755
TL W 11755 – 1
RRD-B30M115 Printed in U S A
1 page  
Typical Performance Characteristics
Limiter Gain vs Frequency with
Temperature as a Parameter
Limiter Gain vs Frequency with
Supply Voltage as a Parameter
TL W 11755 – 4
TL W 11755 – 5
5
5 Page 
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LMX2240M.PDF ] | |
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