ML2721-1

product BRIEF 900MHz DSSS RF to Digital Transceiver Chipset All the BOM Advantages of Direct Conversion Radio The Performance Advantages of a Superhet Radio Small, Simple to Use and Ideal for Volume Manufacture ML2721 Low IF Digital Cordless Transceiver ML2751 Power Amplifier and LNA Features ML2721 Fully Integrated Receiver With 900mhz RF In And NRZ Out Fully Integrated Transmitter With Integrated Modulation Filter Fully Integrated, Self Aligning IF Filtering, Frequency To Voltage Converter, Transmit And Receive Data Filters Integrated Frequency Synthesizer With On Chip Pre Aligned VCO ML2751 Power Amplifier Output +21dbm (125mw) Typical Max Output At 3.0V Power Amplifier Gain 35db (Typical Max) Single Supply 2.7V - 4.5V Operating Range Power Amplifier Efficiency 35% At 3.3V PA Control Pin For Power Consumption Reduction In Portable Products On-Chip Low Noise Amplifier For Receiver On-Chip PIN Diode Drivers For Tx/Rx Small TSSOP-20 Package • • • • Transmitter Low Voltage Lock-Out Circuit To Avoid Out Of Band Emissions At Low Battery Voltage On-Chip DC Regulation For 2.7V To 5.0V Operation Analog RSSI Output Small 32 Pin TQFP Package, 0.75mm Pitch 900MHz DSSS RF to Digital Transceiver Chipset Micro Linear has developed a single IC radio, the ML2721. The very high level of integration absorbs all the circuits either difficult to design or those that require production alignment. Adding just an external RF switch makes a complete radio with a digital control interface. On receive, the input is RF, the output is demodulated data. All the LO circuits are integrated, including the VCO tank circuit which Micro Linear tunes in production. For transmit, the chip is digital data in and modulated RF out. To ensure proper functionality in products, all the DC regulation and power management functions are integrated into the ML2721. This chip can be used for 900MHz ISM band applications, as either a 1.1Mbps to 1.6Mbps FSK radio, or a 1.1Mcps direct sequence radio. To extend the radio range, the ML2751 integrates a 100mW PA and a 18dB gain LNA. The ML2751 PA/LNA can implement front-end solutions for many communications products using TDD/TDMA (half duplex radios) in the 600MHz to 1 GHz range and for transmitter powers up to 100mW at 3.0V. Block Diagram ML2751 ANTENNA LNA 902 - 928 MHz FILTER ML2731 IF CIRCUITS BASEBAND IC MODEM CODEC PROTOCOL MMI CONTROL WATCH AND OSCILLATOR XTAL FILTER ALIGN RF PIN DIODE SWITCH PIN DIODE DRIVERS Tx RF BUFFER CONTROL LOGIC PLL PA & DRIVER QUADRATURE DIVIDED BY 2 Tx DATA FILTER MEMORY KEYPAD DISPLAY MIC SPEAKER RINGER VTUNE LOOP FILTER BATTERY Micro Linear makes no representations or warranties with respect to the accuracy, utility, or completeness of the contents of this publication and reserves the right to make changes to specifications and product descriptions at any time without notice. No license, express or implied, by estoppel or otherwise, to any patents or other intellectual property rights is granted by this document. The circuits contained in this document are offered as possible applications only. Particular uses or applications may invalidate some of the specifications and/or product descriptions contained herein. The customer is urged to perform its own engineering review before deciding on a particular application. Micro Linear assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of Micro Linear products including liability or warranties relating to merchantability, fitness for a particular purpose, or infringement of any intellectual property right. Micro Linear products are not designed for use in medical, CORPORATE HEADQUARTERS WESTERN UNITED STATES Micro Linear Corporation 2092 Concourse Drive San Jose, CA 95131 Tel: (408) 433-5200 Fax: (408) 432-1627 http//www.microlinear.com CENTRAL UNITED STATES Micro Linear Corporation 59 Cardinal Street Pearl River, NY 10965 Tel: (914) 735-5848 Fax: (914) 735-5852 EASTERN UNITED STATES Micro Linear Corporation 35 Pinehurst Avenue Nashua, NH 03062 Tel: (603) 888-1326 Fax: (603) 888-4239 EUROPE Micro Linear Corporation Babraham Road Sawston, Cambridge CB2 4LJ, UK Tel: 44-1223-839534 Fax: 44-1223-836761 ASIA Micro Linear Corporation #705 2-8-12 Mita Minato-ku, Tokyo 108-0073 Tel/Fax: +81-3-5439-6256 © 2000 Micro Linear Corporation. All Rights Reserved. 10k 0200 PB2721-01