LMX4268 Datasheet, PDF (1/4 Pages) National Semiconductor (TI) – Radio Transceiver for DECT

ADVANCED INFORMATION
March 2004
LMX4268
Radio Transceiver for DECT
1.0 General description
2.0 Features
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 0.25µm CMOS
technology, and is packaged in a 44 pin LLP package.
■ 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_b) / 1.152 MHz (HR_b)
■ sensitivity -96 dBm (LR_b) / -93 dBm (HR_b)
■ 2.5V operation
■ Small 44 pin Leadless Leadframe Package
3.0 Applications
■ (DCT) Digital Cordless Telecommunications
4.0 System Diagram
BALUN
PA
BALUN
LNA
0° 90°
PADR
X2
PORTS
MGA
AGC
DEMOD.
MICROWIRE
RX DATA
RSSI
DATA
CLOCK
LE
BIAS
PLL
TX DATA
R_REF
© 2004 National Semiconductor Corporation
www.national.com