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Dual-channel receiver sub-system touts tiny package

Posted: 12 Jun 2009     Print Version  Bookmark and Share

Keywords:14-bit ADC  base band receiver  wireless base stations  multi-channel 


Linear Technology introduces the LTM9002, a dual IF/base band receiver sub-system that includes a high performance dual 14-bit ADC sampling up to 125Msps, anti-aliasing filters, fixed gain differential ADC drivers and 12-bit, trim DACs.

The integrated receiver significantly reduces the board space and development time for wireless base stations implementing I/Q receivers, direct conversion receivers or multi-channel configurations including diversity receivers.

Extensive hands-on applications experience is a prerequisite for any designer hoping to take full advantage of an ADC's capabilities when sampling high dynamic range signals in high-speed communications receivers, communications test equipment or instrumentation. Multichannel applications have several unique requirements, such as channel matching and channel-to-channel isolation. The LTM9002 pays careful attention to these design considerations to provide the optimal connection between the RF and digital domains. Designers no longer need to perform the time consuming tasks of component selection, input impedance matching, filter design and layout, while also eliminating the long hours of troubleshooting and thereby reducing time to market.

For multi-channel applications, channel-to-channel matching and isolation are important considerations. The LTM9002 achieves 90dB isolation at 140MHz input frequency despite the small form factor. The overall gain is typically 26 dB and varies less than 0.1 dB between the two channels. A thoughtful addition, a dual 12-bit auxiliary DAC offers the flexibility to adjust the span and perfectly balance the two channels using an SPI-compatible serial port.

The LTM9002 is packaged in a space-saving 11.25mm x 15mm LGA package, utilising a multi-layer substrate that shields sensitive analogue lines from the digital traces to minimise digital feedback. Supply and reference bypass capacitance is placed inside the module tightly coupled to the die, providing a space, cost and, more significantly, a performance advantage over traditional packaging. With no external capacitance required, the LTM9002 consumes approximately one-fourth the space of the discrete implementation.

The LTM9002 is available in production volumes today and is priced at Rs.4,861.95 ($99.25) each in 1,000 piece quantities.

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