Features and Benefits

  • 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
  • Selectable equalizer
  • LNA and PGA with 45 dB gain range in 6 dB steps
  • Flexible data port supports serial or parallel mode
  • Supports FSK mode for FMCW radar systems
  • On-chip 1.5 V reference
  • Internal oscillator/PLL input: 16 MHz to 54 MHz High speed serial data interface
  • See datasheet for additional features

Product Details

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.

The ADAR7251 supports serial and parallel interfaces at programmable sample rates from 300 kSPS to 1.8 MSPS, as well as easy connections to digital signal processors (DSPs) and microcontroller units (MCUs) in the system.


  • Automotive LSR systems
  • Data acquisition systems

Product Lifecycle icon-recommended Production

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.

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.