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LMX2240M bảng dữ liệu(PDF) 1 Page - National Semiconductor (TI) |
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LMX2240M bảng dữ liệu(HTML) 1 Page - National Semiconductor (TI) |
1 / 12 page 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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