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MADCSM0012SMB Datasheet(PDF) 3 Page - Tyco Electronics |
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MADCSM0012SMB Datasheet(HTML) 3 Page - Tyco Electronics |
3 / 6 page PCS LNA/Downconverter 1800-2000 MHz MADCSM0012 M/A-COM Inc. and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. M/A-COM makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does M/A-COM assume any liability whatsoever arising out of the use or application of any product(s) or information. • North America Tel: 800.366.2266 / Fax: 978.366.2266 • Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300 • Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298 Visit www.macom.com for additional data sheets and product information. V2 3 Operating Instructions Recommended PCB Configuration M/A-COM’s MADCSM0012 is a highly integrated MMIC LNA/downconverter for operation in the 1800-2000 MHz PCS frequency band. The downconverter provides exceptional RF performance while consuming low DC current and is packaged in a low cost plastic package. It is ideal for lightweight battery operated portable radio systems. The MADCSM0012 consists of an LNA, RFA, single-ended mixer and single-ended IF output buffer as shown in the block diagram. Surface mount resistors, inductors and capacitors are used in conjunction with the LNA/downconverter to optimize the trade-offs among performance, tunability and ease of use. The sample board schematic shows the LNA/downconverter and required off-chip components. The input of the LNA is matched externally with a series inductor (L1) and a shunt capacitor (C1) to provide a low loss match to the optimum noise impedance in the band of interest. A high Q inductor such as Coilcraft’s 0402CS series must be used if the specified noise figures are to be achieved. The series capacitor, C2, is a DC blocking and input matching capacitor. The LNA is nominally biased with 15 mA to give an input IP3 of +6 dBm. An external resistor, R1, may be used to increase the LNA bias current and thus increase the IP3. An external image reject filter is required between the LNA output and RFA input to prevent downconversion of noise at the image frequency to the IF. This filter should have a 50- ohm input and output impedance. The mixer is a single-ended floating FET mixer that provides exceptional linearity and isolation with low loss and no DC current. An off-chip inductor, L3, is required to match the output of the mixer to the input of the IF buffer amplifier. The case size of L3 is typically 0603 but if more gain is needed, use a 0805 case size. The LO input port is matched on-chip to 50 ohms. An LO buffer amplifier amplifies the -10 dBm input signal to the level required to drive the mixer. Performance is optimum with a drive level of -7 dBm. All DC supply lines must be properly bypassed at RF frequencies to obtain optimum performance and at lower frequency to maintain unconditional stability. Capacitors C4, C5, C6, C7 and C9 are RF bypass capacitors for the LNA, RFA and LOA. The value and placement of these capacitors is critical in determining the frequency response of these amplifiers. Capacitor C3 is a source bypass capacitor for the second stage of the low noise amplifier. The placement of this capacitor will affect the gain of the LNA. For best performance, all the RF bypass capacitors should be placed as close to the device as possible. The IF output port is the open drain of the IF buffer amplifier. This allows maximum flexibility of the intermediate frequency and also IF filter. A matching network such as that shown herein can be used to match to 50 ohms from the output impedance of the buffer to the input impedance of the filter at the 210 MHz intermediate frequency. The inductor also acts as a choke for the DC supply line. Elements L2 and C8 provide the necessary impedance transformation. |
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