Single-Chip Transceiver ML2751 Variable Power Amplifier

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Single-Chip Transceiver ML2751 Variable Power Amplifier

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900MHz Digital Transceiver Chipset ML2722
Single-Chip Transceiver
ML2751
Variable Power Amplifier
ML2722
Features
ML2751
Single chip band 900MHz Radio Transceiver Fully integrated filters discriminator data filtering TX/RX automatic calibration power transmission reception range architecture allows operation without expensive external filters Integrated 1.83GHz frequency synthesizer with internal resonator Transmit modulation compensation improved sensitivity Programmed 3-wire interface 3.0V 5.0V operation Auxiliary control outputs correctly sequence control Analog Received Signal Strength Indication (RSSI) output baseband
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
Applications
Single 900MHz power radio with data rates 1.5M bits second Hand held devices, gadgetts gizmos Part compliant radio links Game controllers 928MHz radio transceivers with ranges excess 1000 feet with companion ML2751 (LNA/VPA) Robust Direct Sequence Spread Spectrum (DSSS) hostile interference environments Portable computer, remote sensing TDMA radios 900MHz DSSS cordless phones
900MHz DSSS Digital Transceiver Chipset
ML2722 used single chip Direct Sequence Spread Spectrum (DSSS) transceiver general purpose Frequency Shift Keying (FSK) radio transceiver. designed work 928MHz band under Part regulations. device integrates frequency generation, receive transmit functions data rates 1.5M bits second DSSS 1.5M chips second. complete radio only requires addition RX/TX switch. ML2722 contains proprietary receiver with filters integrated. image reject mixer brings 915MHz signal down frequency 1.024MHz. Then filtering, gain, demodulation performed 1MHz. This architecture provides benefits direct conversion baseband reduces need filtering. ML2722 operate with either cost filter. ML2722 contains regulation which allows operate over wide power supply voltage range. also simple baseband interface transmit power management, control detection, RSSI (Receiver Signal Strength Indication). 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) range transmitter powers 100mW 3.0V.
Simplified Applications Diagram
ML2722 ML2751
Antenna 902-928MHz FILTER FILTER ALIGN Diode Switch SWITCH DRIVERS CONTROL LOGIC BUFFER Quadrature divide DATA FILTER CIRCUITS
BASEBAND
DRIVER
VTUNE
LOOP FILTER
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, life saving, life sustaining applications. CORPORATE HEADQUARTERS WESTERN UNITED STATES Micro Linear Corporation 2092 Concourse Drive Jose, 95131 Tel: (408) 433-5200 Fax: (408) 432-1627 dimuro.peter@microlinear.com CENTRAL UNITED STATES Micro Linear Corporation Cardinal Street Pearl River, 10965 Tel: (914) 735-5848 Fax: (914) 735-5852 higgins.patrick@microlinear.com EASTERN UNITED STATES Micro Linear Corporation Pinehurst Avenue Nashua, 03062 Tel: (603) 888-1326 Fax: (603) 888-4239 grazier.mark@microlinear.com EUROPE Micro Linear Corporation Cambridge Design Centre Babraham Road, Sawston Cambridgeshire England Tel: 1344 Fax: 1344 martin.hopson@dial.pipex.com ASIA Micro Linear Corporation Room 28/F., Block Tsun King Road Shatin, N.T., Hong Kong Tel: 852-26348585 Fax: 852-27758284 chan.sandy@microlinear.com
2001 Micro Linear Corporation. Rights Reserved.
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Single-Chip Transceiver ML2751 Variable Power Amplifier

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