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AFE for auto radar provides signal path: 6-channel mux, PGA, LNA, filter, and 14-bit, 80-MapsADC

If you think cars already have “lots” of electronics, look out: there's more coming, as IC vendors increasingly integrate functionality into smaller packages, thus enabling even more functions to be packed into the vehicle at tolerable prices.

Consider the just announced AD8283 analog front end for automotive radar from Analog Devices, Inc. This IC comprises much of the radar-return receive path, after initial down-conversion from the radar antenna. It feeds the 14-bit, 80 Msps analog/digital converter via six-channel multiplexer (mux) each preceded by its own low-noise amplifier (LNA), corresponding programmable gain amplifiers (PGA), and programmable filters, with an internal reference. Control I/O is via the SPI bus and the 3.3 V CMOS parallel data I/O is designed to interface with a DSP or FPGA.

Key functional-block specifications of the AD8283 include:

  • Low noise amplifier with input referred voltage noise below 3.5 nv/√Hz, at maximum gain of 34 dB and sampling rate of 80 Msps
  • Programmable gain , SPI programmable in 6 dB steps, over a 16 to 34 dB range
  • Anti-aliasing filter, 3rd order elliptic, cutoff programmable from 1 to 12 MHz
  • 12-bit, 80 Msps ADC with 67 dB SNR and 68 dB SFDR
  • Channel to channel gain matching of ±0.5 dB and phase matching of ±5°, over the specified operating temperate range of  -40 to +105°C
  • Input impedance of 200 Ω or 200 kΩ, user selectable
  • Power dissipation of 170 mW per channel

Price, packaging, and availability : The AD8283 is $12.00 in 1000-piece lots, and is available now. It is housed in a 72-lead LFCSO package

For more information : go to http://www.analog.com/AD8283 .

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