Octal LNA/VGA/AAF/ADC and CW I/Q Demodulator
Each channel features a variable gain range of 45 dB, a fully differential signal path, an active input preamplifier termination, a maximum gain of up to 51 dB, and an ADC with a conversion rate of up to 65 MSPS. The channel is optimized for dynamic performance and low power in applications where a small package size is critical.
The LNA has a single-ended-to-differential gain that is selectable through the SPI. The LNA input noise is typically 1.3 nV/√Hz at a gain of 21.3 dB, and the combined input-referred noise of the entire channel is 1.3 nV/√Hz at maximum gain. Assuming a 15 MHz noise bandwidth (NBW) and a 21.3 dB LNA gain, the input SNR is roughly 88 dB. In CW Doppler mode, each LNA output drives an I/Q demodulator. Each demodulator has inde-pendently programmable phase rotation through the SPI with 16 phase settings.
The AD9278 requires a LVPECL-/CMOS-/LVDS-compatible sample rate clock for full performance operation. No external reference or driver components are required for many applications.
The ADC automatically multiplies the sample rate clock for the appropriate LVDS serial data rate. A data clock (DCO±) for capturing data on the output and a frame clock (FCO±) trigger for signaling a new output byte are provided.
Powering down individual channels is supported to increase battery life for portable applications. A standby mode option allows quick power-up for power cycling. In CW Doppler opera-tion, the VGA, AAF, and ADC are powered down. The power of the TGC path scales with selectable ADC speed power modes.
The ADC contains several features designed to maximize flexibility and minimize system cost, such as a programmable clock, data alignment, and programmable digital test pattern generation. The digital test patterns include built-in fixed patterns, built-in pseudo-random patterns, and custom user-defined test patterns entered via the serial port interface.
Fabricated in an advanced BiCMOS process, the AD9278 is available in a 10 mm × 10 mm, RoHS compliant, 144-lead BGA. It is specified over the industrial temperature range of −40°C to +85°C.
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This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
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- For sampling the I and Q signals in analog beamforming applications , we recommend the AD7982 .
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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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