Octal LNA/VGA/AAF/ADC and Crosspoint Switch
The AD9271 is designed for low cost, low power, small size, and ease of use. It contains eight channels of a variable gain amp-lifier (VGA) with low noise preamplifier (LNA); an antialiasing filter (AAF); and a 12-bit, 10 MSPS to 50 MSPS analog-to-digital converter (ADC).
Each channel features a variable gain range of 30 dB, a fully differential signal path, an active input preamplifier termination, a maximum gain of up to 40 dB, and an ADC with a conversion rate of up to 50 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 1.2 nV/√Hz, and the combined input-referred noise of the entire channel is 1.4 nV/√Hz at maximum gain. Assuming a 15 MHz noise bandwidth (NBW) and a 15.6 dB LNA gain, the input SNR is roughly 86 dB. In CW Doppler mode, the LNA output drives a transconductance amp that is switched through an 8 × 6 differential crosspoint switch. The switch is programmable through the SPI.
- Medical imaging/ultrasound
- Automotive radar
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Integrated Analog Front End (AFE) Contains Eight Ultrasound Receive Channels...
The AD9271 delivers an unprecedented level of integration for cart and portable ultrasound designers.
Designing Power Supplies for High Speed ADC
Semiconductors: The Heart of Next-Generation Medical Devices
Highly integrated chips are paving the way for smaller, more portable equipment.
(Design News, May 18, 2009)
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