LMX4268 National Semiconductor, LMX4268 Datasheet

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LMX4268

Manufacturer Part Number
LMX4268
Description
Radio Transceiver for DECT
Manufacturer
National Semiconductor
Datasheet

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© 2004 National Semiconductor Corporation
LMX4268
Radio Transceiver for DECT
1.0 General description
The LMX4268 is a radio transceiver integrated circuit opti-
mized for the Digital Cordless Telecommunications (DCT)
system. The transceiver, when combined with a power
amplifier and a Tx/Rx switch, implements a complete
2.4GHz ISM band digital radio transceiver compliant with
the FCC rules part 15. The LMX4268 interfaces directly to
National Semiconductor’s SC144XX DCT family of base-
band processors.
The LMX4268 integrates a complete transmitter, consisting
of a phase locked loop, VCO and PA driver. The receiver
contains LNA, quadrature downconverter, polyphase filter,
automatic gain control and demodulator.
The LMX4268 operates from a single 2.5V supply. The
LMX4268 is manufactured in National’s 0.25 m CMOS
technology, and is packaged in a 44 pin LLP package.
4.0 System Diagram
PA
BALUN
BALUN
PORTS
LNA
PADR
TX DATA
2.0 Features
3.0 Applications
Fully integrated 2.4 GHz CMOS low-IF transceiver
Low power consumption
On-chip Voltage Controlled Oscillator (VCO)
On-chip low noise amplifier (LNA)
Open-loop modulation
On chip Modulation Gain Amplifier (MGA)
On-chip timing control
Four digital (5 mA) output ports
0 dBm PA driver output
dual bit rate 0.576 MHz (LR
sensitivity -96 dBm (LR
2.5V operation
Small 44 pin Leadless Leadframe Package
(DCT) Digital Cordless Telecommunications
MGA
90°
X2
ADVANCED INFORMATION
AGC
PLL
b
) / -93 dBm (HR
MICROWIRE
DEMOD.
b
) / 1.152 MHz (HR
BIAS
R_REF
www.national.com
b
)
March 2004
RX DATA
RSSI
DATA
CLOCK
LE
b
)

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LMX4268 Summary of contents

Page 1

... The transceiver, when combined with a power amplifier and a Tx/Rx switch, implements a complete 2.4GHz ISM band digital radio transceiver compliant with the FCC rules part 15. The LMX4268 interfaces directly to National Semiconductor’s SC144XX DCT family of base- band processors. The LMX4268 integrates a complete transmitter, consisting of a phase locked loop, VCO and PA driver ...

Page 2

Specifications 5.1 ABSOLUTE MAXIMUM RATINGS Parameter Vdd Power Supply Voltage max (Vdd_shield, Vdd_ADC, Vdd_mix, Vdd_LNA, Vdd_ESD, Vdd_PAdr, Vdd_presc, Vdd_PLL, Vdd_VCO, Vdd_bias, Vdd_dig, Vdd_RSSI) Absolute difference between power supplies Vn Voltage on any pin max T Storage Temperature storage T ...

Page 3

... Obsolete Not in Production National Semiconductor reserves the right to make changes without notice to any products herein to improve reliability, function or design. National does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the right of others. ...

Page 4

... BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Spec- ification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no “Banned Sub- stances” as defined in CSP-9-111S2. ...

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