LMX2240 Datasheet | National Semiconductor

Description The LMX2240 is a monolithic integrated intermediate frequency receiver suitable for use in Digital European Cordless Telemunications (DECT) systems as well as other mobile telephony and wireless munications applications It is fabricated using National’s ABi CTM IV Bi CMOS process (f T e 15 GHz) The LMX2240 consists of a high gain limiting amplifier a frequency discriminator and a received signal strength indicator (RSSI) The high gain limiting amplifier and discriminator operate in the 40 MHz to 150 MHz frequency range and the limiter has approximately 70 d B of gain The use of the limiter and the discriminator provides a low cost high performance demodulator for munications systems The RSSI output can be used for channel quality monitoring The LMX2240 is intended to support single conversion receivers This device saves power size and cost by eliminating the second local oscillator (LO) second converter (mixer) and additional filters The LMX2240 is remended for systems with channel bandwidths of 300 k Hz to 2 5 MHz The LMX2240 is available in a 16-pin JEDEC surface mount plastic package Features Typical operation at 110 MHz RF sensitivity to b75 d Bm RSSI sensitivity to b 82 d Bm High gain (70 d B) limiting amplifier Average current consumption 480 m A for DECT handset (burst mode) a 3V operation Power down mode for increased current savings Part of a plete receiver solution with the LMX2216 LNA Mixer the LMX2315 20 Phase-locked Loop and the LMX2411 Baseband Processor pliant to ARi1TM specification Applications Y Y Y Y Y Digital European Cordless Telemunications (DECT) Portable wireless munications (PCS PCN cordless) Wireless local area networks (WLANs) Digital cellular telephone systems Other wireless munications systems Functional Block Diagram TL W 11755 - 1 ABi CTM and ARi1TM are trademarks of National Semiconductor Corporation C1995 National Semiconductor Corporation TL W 11755 RRD-B30M115 Printed in U S A Connection...