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Analog Devices intros four-channel data acquisition system

20 Feb 2015  | Graham Prophet

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ADAR7251

Analog Devices unveiled the ADAR7251, a 4-channel, 16bit simultaneous sampling data-acquisition system designed for automotive radar systems.

Each of the four channels contains a low-noise amplifier (LNA), a programmable-gain amplifier (PGA), an equaliser, a multi-bit sigma-delta (Σ-Δ) ADC, and a decimation filter. The front-end circuitry allows direct connection to microwave mixer output with few external passive components, eliminating the need for a high-order antialiasing filter, driver op amps and bipolar supplies, and providing precise channel-to-channel drift matching.

The on-chip phase-locked loop (PLL) allows a range of clock frequencies for system flexibility. The ADC can be synchronised with an external ramp for FSK-FMCW radar applications. It supports serial and parallel interfaces at programmable sample rates from 300ks/s to 1.8Ms/s, as well as simple connections to digital signal processors and microcontrollers.

Operating on 1.8V and 3.3V supplies, the ADAR7251 dissipates 400mW at 1.2Ms/s and 5mW in power-down mode. Available in a 48-lead LFCSP package, it is specified from –40°C to 125°C and priced at $9 (1,000).




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