Advantages Direct Conversion Radio Performance Advantages Superhet Rad

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Advantages Direct Conversion Radio Performance Advantages Superhet Rad

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900MHz DSSS Digital Transceiver Chipset
Advantages Direct Conversion Radio Performance Advantages Superhet Radio Small, Simple Ideal Volume Manufacture
ML2721
Digital Cordless Transceiver
ML2751
Power Amplifier
Features
ML2721
Fully Integrated Receiver With 900mhz Fully Integrated Transmitter With Integrated Modulation Filter Fully Integrated, Self Aligning Filtering, Frequency Voltage Converter, Transmit Receive Data Filters Integrated Frequency Synthesizer With Chip Aligned
ML2751
Power Amplifier Output +21dbm (125mw) Typical Output 3.0V Power Amplifier Gain 35db (Typical Max) Single Supply 2.7V 4.5V Operating Range Power Amplifier Efficiency 3.3V Control Power Consumption Reduction Portable Products On-Chip Noise Amplifier Receiver On-Chip Diode Drivers Tx/Rx Small TSSOP-20 Package
Transmitter Voltage Lock-Out Circuit Avoid Band Emissions Battery Voltage On-Chip Regulation 2.7V 5.0V Operation Analog RSSI Output Small TQFP Package, 0.75mm Pitch
900MHz DSSS Digital Transceiver Chipset Micro Linear developed single radio, ML2721. very high level integration absorbs circuits either difficult design those that require production alignment. Adding just external switch makes complete radio with digital control interface. receive, input output demodulated data. circuits integrated, including tank circuit which Micro Linear tunes production. transmit, chip digital data modulated out. ensure proper functionality products, regulation power management functions integrated into ML2721. This chip used 900MHz band applications, either 1.1Mbps 1.6Mbps radio, 1.1Mcps direct sequence radio. extend radio range, ML2751 integrates 100mW 18dB gain LNA. ML2751 PA/LNA implement front-end solutions many communications products using TDD/TDMA (half duplex radios) 600MHz range transmitter powers 100mW 3.0V. Block Diagram
ML2751
ANTENNA
FILTER
ML2731
CIRCUITS BASEBAND MODEM CODEC PROTOCOL CONTROL WATCH OSCILLATOR XTAL
FILTER ALIGN
DIODE SWITCH
DIODE DRIVERS BUFFER
CONTROL LOGIC
DRIVER
QUADRATURE DIVIDED
DATA FILTER
MEMORY
KEYPAD DISPLAY SPEAKER RINGER
VTUNE
LOOP FILTER BATTERY
Micro Linear makes representations warranties with respect accuracy, utility, completeness contents this publication reserves right make changes specifications product descriptions time without notice. license, express implied, estoppel otherwise, patents other intellectual property rights granted this document. circuits contained this document offered possible applications only. Particular uses applications invalidate some specifications and/or product descriptions contained herein. customer urged perform engineering review before deciding particular application. Micro Linear assumes liability whatsoever, disclaims express implied warranty, relating sale and/or Micro Linear products including liability warranties relating merchantability, fitness particular purpose, infringement intellectual property right. Micro Linear products designed medical,
CORPORATE HEADQUARTERS WESTERN UNITED STATES Micro Linear Corporation 2092 Concourse Drive Jose, 95131 Tel: (408) 433-5200 Fax: (408) 432-1627 http//www.microlinear.com
CENTRAL UNITED STATES Micro Linear Corporation Cardinal Street Pearl River, 10965 Tel: (914) 735-5848 Fax: (914) 735-5852
EASTERN UNITED STATES Micro Linear Corporation Pinehurst Avenue Nashua, 03062 Tel: (603) 888-1326 Fax: (603) 888-4239
EUROPE Micro Linear Corporation Babraham Road Sawston, Cambridge 4LJ, 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. Rights Reserved.
0200
PB2721-01

Advantages Direct Conversion Radio Performance Advantages Superhet Rad

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