Integrated Circuit : ADAR7251

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Presentation

The ADAR7251 is a 16-bit, 4-channel, simultaneous sampling analog-to-digital converter (ADC) designed especially for applications such as automotive LSR-FMCW or FSK-FMCW radar systems. Each of the four channels contains a low noise amplifier (LNA), a programmable gain amplifier (PGA), an equalizer, a multibit Σ-Δ ADC, and a decimation filter.

The front-end circuitry is designed to allow direct connection to an MMIC output with few external passive components. The ADAR7251 eliminates the need for a high order antialiasing filter, driver op amps, and external bipolar supplies. The ADAR7251 also offers precise channel-to-channel drift matching.

The ADAR7251 features an on-chip phase-locked loop (PLL) that allows a range of clock frequencies for flexibility in the system. The CONV_START input and DATA_READY output signals synchronize the ADC with an external ramp for applications such as FSK-FMCW radar.

Technical features

Low noise: 2.4 nV/√Hz input referred voltage noise at maximum gain setting Wide input signal bandwidth: 500 kHz at 1.2 MSPS sample rate, 16-bit resolution Additional sample rates supported: 300 kSPS, 450 kSPS, 600 kSPS, 900 kSPS, and 1.8 MSPS 4 differential simultaneous sampling channels No active antialiasing filter required LNA and PGA with 45 dB gain range in 6 dB steps Selectable equalizer Flexible data port supports serial or parallel mode Supports FSK mode for FMCW radar systems On-chip 1.5 V reference

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