Product category: Communications ICs (Wired)
News Release from: Maxim Integrated Products | Subject: MAX9981
Edited by the Electronicstalk Editorial Team on 25 October 2002
Mixer mops up a batch of basestation
components
The MAX9981 is the first active SiGe mixer to include an LO switch and splitter, two LO buffers, and on-chip baluns - all in a dual package.
The MAX9981 is the first active SiGe mixer to include an LO switch and splitter, two LO buffers, and on-chip baluns - all in a dual package This mixer is specifically designed to meet the demanding requirements of today's cellular and GSM900 wireless infrastructure applications
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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The MAX9981 provides 2dB of conversion gain, 12dB of noise figure, and 26.8dBm of IIP3 performance, while replacing two mixers, four amps, three baluns, an LO switch and splitter, plus dozens of discrete components.
This integration reduces the overall size and part count of the mixer circuit by 2.5 times and 52%, respectively.
In addition, the MAX9981 increases production yields while simultaneously providing a more ESD-reliable solution than other GaAs alternatives.
The MAX9981 is ideal for 825 to 915MHz GSM, cdma2000, TDMA, and iDEN basestation applications where high linearity and low noise figure are required for receiver designs.
As the device provides more than 2dB of conversion gain, the designer can eliminate a complete IF amplifier stage within the receiver lineup.
On-chip RF and LO baluns and built-in matching circuits accommodate single-ended 50ohm terminations.
The integrated LO switch supports GSM frequency hopping, and switching speeds of less than 250ns are typical with better than 50dB of LO-to-LO isolation.
The onboard LO buffer provides +/-5dB drive variance control, yielding stable G, NF, and IIP3 performance over temperature, supply, and input power.
The MAX9981 has an excellent gain spread of +/-0.6dB from nominal at room, and -0.0135dB/degC over temperature.
The IIP3 spread is similarly impressive at +/-0.5dB over temperature.
The MAX9981 is available in a 6 x 6mm 36-pin QFN package that is fully qualified for direct PC board mount.
Prices start at $12.25 (1000-up, FOB USA).
(This was Electronicstalk's Top Story on 24 October 2002).
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