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LMX2240 Datasheet

Intermediate Frequency Receiver

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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


National Semiconductor Electronic Components Datasheet

LMX2240 Datasheet

Intermediate Frequency Receiver

No Preview Available !

Connection Diagram
Small Outline Package
Pin Description
Top View
Order Number LMX2240M
See NS Package Number M16A
TL W 11755 – 2
Pin No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Name
IO
Description
PD I Power Down a HIGH signal switches the part to power down mode
RSSI Out
O Voltage output of the received signal strength indicator (RSSI)
NC No connection
GND
Ground
GND
Ground
MID O Mid-range output of the discriminator can be used for comparator threshold
Demod Out O Demodulated output of the discriminator
VCC (Mixer)
Source voltage for the mixer (discriminator)
VCC (Lim )
Source voltage for the limiter
Quad In
I Quadrature input A DC path from source through an inductor must be present at
this pin but there must be no series resistance (a parallel resistor to the inductor
is acceptable)
Lim Out
O Limiter output to the quadrature tank
GND
Ground
GND
Ground
Comp
Compensation pin for the limiter See Applications Information for capacitor
value
Comp
Compensation pin for the limiter See Applications Information for capacitor
value
IF In I IF input to the limiter
2


Part Number LMX2240
Description Intermediate Frequency Receiver
Maker National Semiconductor
Total Page 12 Pages
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