LM
X4
168
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2004 National Semiconductor Corporation
www.national.com
ADVANCED INFORMATION
March 2004
LMX4168
Radio Transceiver for DECT
1.0 General description
The LMX4168 is a radio transceiver integrated circuit opti-
mized for the Digital Enhanced Cordless Telecommunica-
tions (DECT) system. The transceiver, when combined with
a power amplifier and a Tx/Rx switch, implements a com-
plete DECT radio transceiver compliant with the ETSI
CTR6 standard. The LMX4168 interfaces to National Semi-
conductor's SC144XX DECT family of baseband proces-
sors.
The LMX4168 integrates a complete transmitter, consisting
of a phase locked loop, VCO and PA driver. The receiver
contains LNA, quadrature downconverter, polyphase fil-
ter/combiner, automatic gain control, and demodulator.
The LMX4168 operates from a single 2.252.75V supply.
The LMX4168 is manufactured in National's 0.25
m
CMOS technology, and is packaged in a 44 pin LLP pack-
age
2.0 Features
Highly integrated 1.9 GHz low-IF CMOS transceiver
Down conversion to half the DECT channel spacing (864
kHz)
On-chip channel select filter
On-chip Voltage Controlled Oscillator (VCO)
On-chip low noise amplifier (LNA)
Open-loop modulation
On-chip timing control
Four digital (5 mA) output ports
0 dBm PA driver output
-95 dBm sensitivity
2.5V operation
Small 44 pin Leadless Leadframe Package
3.0 Applications
(DECT) Digital Enhanced Cordless Telecommunications
4.0 System Diagram
TXDATA
RX_DATA
RSSI
DATA
CLOCK
LE
AGC
DEMOD.
0
90
DEMOD.
PA
BIAS
X2
PLL
PADR
MICROWIRE
LNA
BALUN
BALUN
PORTS
R REF
www.national.com
2
LM
X4
168
5.0 Specifications
5.1 ABSOLUTE MAXIMUM RATINGS
5.2 ELECTRICAL CHARACTERISTICS
Table 1. Absolute Maximum Ratings
1
Parameter
Description
Value
Unit
Min
Typ
Max
Vdd_max
Power supply voltage
(Vdd_ADC, Vdd_IF, Vdd_mix, Vdd_LNA, Vdd_ESD,
Vdd_PAdr, Vdd_presc, Vdd_PLL, Vdd_VCO,
Vdd_shield, Vdd_bias, Vdd_dig, Vdd_RSSI)
-0.3
3.0
V
Absolute difference between power supplies
0.3
V
V
n
Voltage on any pin
-0.3
Vdd+0.3
V
P
in
Input power (at pins Rxin, RxinZ)
+15
dBm
T
S
Storage temperature
-65
+150
C
T
L
Lead temperature (solder 4 sec)
+ 260
C
V
HBM
ESD - human body model
2
2
kV
V
MM
ESD - machine model
2
250
V
1.
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate
conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guar-
anteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only
to the test conditions listed.
2.
MSL 2 (Moisture Sensitivity Level) is valid when the standard reflow process (235C) is used. MSL 2 means 1 year shelf
life after opening dry-pack. MSL 2(1 year shelf life) is also valid when the lead free reflow process (260C) is used. Stor-
age conditions are max. 30C / 60% rel. humidity.
Table 2. Recommended Operating Conditions
Parameter
Description
Value
Unit
Min
Typ
Max
Vdd
Power supply voltage
(Vdd_ADC, Vdd_IF, Vdd_mix, Vdd_LNA, Vdd_ESD,
Vdd_PAdr, Vdd_presc, Vdd_PLL, Vdd_VCO,
Vdd_shield, Vdd_bias, Vdd_dig, Vdd_RSSI)
2.25
2.5
2.75
V
V
TXoutZ
,
V
TXout
PA driver output biasing voltage @ pins 16 and 17
2.0
V
T
A
Operating temperature
-10
+60
C
Rref
Reference resistor connected from pin 31 to Vss
60
62
64
k
Revision 1.0 (Confidential)
3
LM
X4
168
6.0 Product Status Definitions
Datasheet Status
Product Status
Definition
Advance Information
Formative or in Design
This data sheet contains the design specifications for product
development. Specifications may change in any manner
without notice.
Preliminary
First Production
This data sheet contains preliminary data. Supplementary data
will be published at a later date. National Semiconductor
Corporation reserves the right to make changes at any time
without notice in order to improve design and supply the best
possible product.
No Identification Noted
Full production
This data sheet contains final specifications. National
Semiconductor Corporation reserves the right to make changes
at any time without notice in order to improve design and supply
the best possible product.
Obsolete
Not in Production
This data sheet contains specifications on a product that has
been discontinued by National Semiconductor Corporation.
The datasheet is printed for reference information only.
LMX
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National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
LIFE SUPPORT POLICY
NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems which,
(a) are intended for surgical implant into the body, or (b) support
or sustain life, and whose failure to perform, when properly used
in accordance with instructions for use provided in the labeling,
can be reasonably expected to result in a significant injury to the
user.
2. A critical component is any component of a life support device or
system whose failure to perform can be reasonably expected to
cause the failure of the life support device or system, or to affect
its safety or effectiveness.
National Semiconductor
Corporation
Tel: 1-800-272-9959
Fax: 1-800-737-7018
Email: support@nsc.com
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+49 (0) 180-530 85 86
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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.
7.0 Package Information
inches (millimeters) unless otherwise noted
Order Number For Tray LMX4168FLQ, xx units per Tray, xx Trays per Shipment Box.
Order Number For Tape/Reel LMX4168FLQx, xxxx units per Tape/Reel, 1 Reel per Shipment Box
44 pins Leadless Leadframe Package. NS Package Number LQA044AF
Note:
MSL 2 (Moisture Sensitivity Level) is valid when the standard reflow process (235C) is used. MSL 2 = 1 year -
after opening dry-pack. Storage conditions are max 30C / 60% rel humidity.
Note:
Refer to the application note AN-1187 for relevant soldering information.
This document can be downloaded from http://www.national.com/an/AN/AN-1187.pdf
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