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| product BRIEF 2.4GHz FHSS Radio Chipset Very Small Form Factor 3 Wire Interface 802.11 Compatible 10s Tx-Rx Switching Auto Aligning Discriminator ML2712 ML2713 ML2731 2.4GHz Radio Transceiver Radio IF Transceiver PA Bias Controller Features ML2712 1LO and 2LO VCO and PLL On-Chip 1LO and 2LO Tank Circuits Off-Chip Directly Modulated VCO Transmitter PLL Programming with 3 Wire IF Operation to 2.5GHz 48 Pin TQFP Package ML2713 Image Reject Up - Convert Mixer On-Chip Receive Down - Convert Mixer On-Chip Integrated Discriminator and Filter Alignment Circuits High Signal to Noise at Discriminator Output Received Signal Strength Indication Output On-Chip DAC Generates Modulated IF Low Noise Regulator Output 48 Pin TQFP Package ML2731 PA Current Control 10MHz - 40MHz Frequency Range Fast Start Negative Voltage Generator On-Chip Regulators 16 Pin TSSOP Package 2.4GHz FHSS Radio Chipset The 2.4GHz radio chipset is targeted at the IEEE802.11 Frequency Hopping Spread Spectrum standard. Two devices; ML2712 2.4GHz RF Transceiver and the ML2713 IF Transceiver implement a very highly integrated, easy to use radio with a low cost bill of materials. The transmit path includes a DAC and IF up converter in the ML2713 followed by an integrated transmit PLL, 2.4GHz mixer and directly modulated VCO in the ML2712. The result is accurate digital generation of the modulated signal for 802.11 compatibility and maintenance of adequate transmitter range even without RF bandpass filters. The dual conversion receiver features high dynamic range and support for the 4G FSK/2Mbps requirement of 802.11 standard. The chipset also inplements a self aligning descriminator adjusted with every frequency hop. An optional ML2731 PA Bias Controller completes the set. Block Diagram VPA PA on/off switch and current sense ML2731 PAEN ICON VBIAS Bias Control NEGEN VNEG C1 C2 Crystal Oscillator XIN Crystal XOUT Voltage Regulator REGO Sine & square wave drivers Negative voltage generator PDN SINO R. C. Loop Filter CLKO ML2712 Transmit Power Amplifier WB Charge Pump/WB Phase Comp DAC 2LO VCO RSSI Input + - LPF PLL 2 2LO Loop Filter & Tank Circuit Lock Detect Baseband IC 1LO Loop Filter & Tank Circuit PLL 1 x2 1LO VCO MUX 32MHz Clock Reference Frequency Input Image Reject Rx IF Downconverter Tx Regulator Output RSSI Limiter Discriminator Data Filter Quad & Filter Auto Align DC Restore Rx Out + - ML2713 Tx Regulator Output Image Reject Tx DC IF Upconverter Reg Control Circuits Control Interface DAC D/A Input 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 (c) 2000 Micro Linear Corporation. All Rights Reserved. 10k 0200 PB2712-01 |
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