|Category||RF & Microwaves => Up/Down Converters|
|Description||Dual Mode Cellular Downconverter, 869 - 893 MHZ|
|Datasheet||Download MADCSM0011 datasheet
Dual Mode Downconverter with LO Amplifier 3mm FQFP-N Plastic Package Operates over 5 V Supply Voltage High Gain: 12.5 dB Typical High Input Intercept Point: +8 dBm Typical Low Current Draw: 12 mA Typical Adjustable IP3 Level Low LO Drive Level: -10 dBmDescription
M/A-COM's MADCSM0011 integrated downconverter combines a downconverting mixer, an IF amplifier, a LO buffer amplifier and an output mode switch. The MADCSM0011 is packaged in a low cost 3mm FQFP-N plastic package with an exposed pad for improved high frequency grounding. M/A-COM designed the MADCSM0011 for handsets requiring wide dynamic range and low power consumption. A mode switch is incorporated into the MADCSM0011 to switch between CDMA and AMPs operation. The MADCSM0011 is fabricated using M/A-COM's 0.5-micron low noise E/D GaAs MESFET process. The process features full passivation for increased performance and reliability.
Parameter Conversion Gain Noise Figure Input Intercept Point Return Loss Isolation Idd 1. All measurements are for both output modes. Test Conditions LO Pin = -10 dBm LO Pin = -10 dBm LO Pin = -10 dBm RF, LO Pin = -10 dBm LO, LO Pin = -10 dBm RF to IF, LO Pin = -10 dBm LO to IF, LO Pin = -10 dBm LO Pin = -10 dBm Units dB dBm dB mA Min Typ Max 15
DC and RF Ground LOA supply voltage; RF bypassing required Parallel RC network determines the IFA Current, Gain and IIP3 CDMA IF Output of downconverter; IF matching required DC and RF Ground AMPs IF Output of downconverter; IF matching required Selects between AMPs and CDMA IF Output IFA supply voltage; RF bypassing required IFA Input
Part C1 C2 Value nH 34 ohms Purpose Mixer Input RF Matching Mixer to IFA Matching Vdd Bypass IFA Source Bypass IFA Output Matching IFA Output Matching Vmode Bypass Mixer Input RF Matching Mixer to IFA Matching LOA Input Matching LOA Matching IFA Output Matching IFA Source Resistor
Parameter Voltage Input Power Operating Temperature Storage Temperature Absolute Maximum 6V 0 dBm to +150°C2. Exceeding any one or combination of these limits may cause permanent damage to this device.
M/A-COM Inc. and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information.
2 n North America: Tel. 366-2266 n Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298 n Europe: Tel. 300 020
M/A-COM's is a highly integrated MMIC dual mode downconverter for operation in the 800900 MHz Cellular 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 MADCSM0011 consists of a single-ended mixer, an LO buffer amplifier, a single-ended IF amplifier and a mode switch. Surface mount resistors, inductors and capacitors are used in conjunction with the downconverter to optimize the trade-offs among performance, tunability and ease of use. The sample board schematic shows the downconverter and required off-chip components. The mixer is a single-ended mixer that provides exceptional linearity and isolation with low loss and no DC current. An off-chip inductor (L2) and capacitor (C2) are required to match the output of the mixer to the input of the IF buffer amplifier. The IF output is selected by the mode switch. Each output port is the open drain of the IF buffer amplifier. This allows maximum flexibility of the intermediate frequency and 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 85.38 MHz intermediate frequency. The inductor also acts as a choke for the DC supply line. Elements L5, C6 and C7 (CDMA mode) and L6, C8 and C9 (AMPS mode) provide the necessary impedance transformations. 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. The 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 a lower frequency to maintain unconditional stability. Capacitors C10, C11 and C12 are RF bypass capacitors for the IFA and LOA. The value and placement of these capacitors is critical in determining the frequency response of these amplifiers.
3 n North America: Tel. 366-2266 n Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298 n Europe: Tel. 300 020
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