LMX4268

LMX4268 Radio Transceiver for DECT ADVANCED INFORMATION March 2004 LMX4268 Radio Transceiver for DECT 1.0 General description The LMX4268 is a radio transceiver integrated circuit optimized 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 baseband processors. 2.0 Features 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 (LRb) / 1.152 MHz (HRb) sensitivity -96 dBm (LRb) / -93 dBm (HRb) 2.5V operation Small 44 pin Leadless Leadframe Package ■ ■ ■ ■ ■ ■ ■ 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. ■ 3.0 Applications ■ (DCT) Digital Cordless Telecommunications 4.0 System Diagram AGC DEMOD. BALUN LNA RSSI 0° 90° DATA MICROWIRE PA BALUN PADR X2 CLOCK LE RX DATA PORTS MGA PLL BIAS TX DATA R_REF © 2004 National Semiconductor Corporation www.national.com LMX4268 5.0 Specifications 5.1 ABSOLUTE MAXIMUM RATINGS Table 1. Absolute Maximum Ratings Parameter Vddmax Power Supply Voltage (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 Vnmax Tstorage TLead VHBM VMM Voltage on any pin Storage Temperature Lead Temp. (solder 4 sec)3 ESD - human body model 4 ESD - machine model 4 -0.3 -40 0.3 Vdd+0.3 +150 +260 2.0 200 V V °C °C kV V Description 1,2 Min -0.3 Typ - Max 3.0 Units V 1.tbc = To be characterized 2.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 guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only to the test conditions listed. 3.MSL 2 (Moisture Sensitivity Level) is valid when the standard reflow process (235°C) is used. MSL 2 means 1 year shelf life after opening dry-pack. MSL 2(1 year shelf life) is also valid when the leadfree reflow process (260°C) is used. Storage conditions are max. 30°C / 60% rel. humidity. 4.ESD STATEMENT This device is a high performance RF integrated circuit and is ESD sensitive. Handling and assembly of this device should be performed at ESD free workstations. 5.2 ELECTRICAL CHARACTERISTICS Table 2. Recommended Operating Conditions Parameter Vdd Description Power Supply Voltage (Vdd_shield, Vdd_ADC, Vdd_mix, Vdd_LNA, Vdd_ESD, Vdd_PAdr, Vdd_presc, Vdd_PLL, Vdd_VCO, Vdd_bias, Vdd_dig, Vdd_RSSI) PA driver output biasing voltage on pins TXoutZ, TXout Operating ambient temperature Reference resistor connected from pin 31 to Vss (see Table 1) Min 2.25 Typ 2.5 Max 2.75 Units V VTXout Ta R_ref -20 61 2.0 62 +70 63 V °C kΩ www.national.com 2 LMX4268 6.0 Product Status Definitions Datasheet Status Advance Information Product Status Formative or in Design Definition This data sheet contains the design specifications for product development. Specifications may change in any manner without notice. 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. 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. This data sheet contains specifications on a product that has been discontinued by National Semiconductor Corporation. The datasheet is printed for reference information only. Preliminary First Production No Identification Noted Full production 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. 3 LMX4268 Radio Transceiver for DECT 7.0 Package Information inches (millimeters) unless otherwise noted Figure 1. 44 pins Leadless Leadframe Package - NS Package Number LQA44 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 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. BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no “Banned Substances” as defined in CSP-9-111S2. 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