ADAR7251WBCSZ-RL

Analog To Digital Converters (ADC) Overview

The ADAR7251WBCSZ-RL is a 4-channel, 16-bit simultaneous sampling analog-to-digital converter (ADC) designed for automotive LSR-FMCW and FSK-FMCW radar systems. It integrates low noise amplifiers (LNA), programmable gain amplifiers (PGA), equalizers, multibit Σ-Δ ADCs, and decimation filters. The device supports sample rates from 300 kSPS to 1.8 MSPS with an input signal bandwidth of up to 900 kHz at the maximum rate. Key electrical parameters include a typical SNR of 94 dB, SFDR of 82 dB, and input referred voltage noise as low as 2.4 nV/√Hz at maximum gain. It operates on a single 3.3 V supply with an internal 1.8 V digital core regulator.

Analog To Digital Converters (ADC) Feature Summary

• Integrated front-end circuitry including LNA, PGA, and equalizer eliminates the need for external antialiasing filters or driver op amps.
• On-chip phase-locked loop (PLL) provides flexible clocking options ranging from 16 MHz to 54 MHz.
• Flexible data port supports both serial and parallel interfaces for easy connection to DSPs and MCUs.
• Supports FSK mode synchronization via CONV_START and DATA_READY signals for radar applications.

Analog To Digital Converters (ADC) Applications

• Automotive Low Side Radar (LSR) systems
• FSK-FMCW radar systems
• General data acquisition systems

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix WBCSZ-RL against the manufacturer's official ordering guide to confirm package type, temperature range, and reel packaging specifications. Ensure the component meets the required automotive qualification standards if used in safety-critical applications. Cross-reference the datasheet revision to confirm all electrical characteristics match the design requirements.

Analog To Digital Converters (ADC) Selection Notes

Select this component when designing high-resolution radar receivers requiring simultaneous multi-channel sampling without external filtering. Consider the integrated LNA and PGA gain ranges to determine if additional amplification is needed. Evaluate the available sample rates against the required input signal bandwidth and Nyquist criteria for the specific radar waveform being processed.

Analog To Digital Converters (ADC) Part Context

The ADAR7251 belongs to Analog Devices' family of continuous-time data acquisition ADCs tailored for automotive radar. It replaces traditional architectures that require discrete antialiasing filters and bipolar supplies. The device simplifies PCB layout by integrating the entire analog front end and digital interface into a single 48-lead LFCSP_SS package.

Analog To Digital Converters (ADC) Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the source documentation. Consult the manufacturer's official replacement guide or contact technical support for validated alternatives compatible with the same pinout and functionality.

Analog To Digital Converters (ADC) FAQ

What is the maximum input signal bandwidth supported by the ADAR7251?

The ADAR7251 supports an input signal bandwidth of up to 900 kHz when operating at the maximum sample rate of 1.8 MSPS.

Does the ADAR7251 require an external antialiasing filter?

No, the ADAR7251 eliminates the need for a high-order antialiasing filter due to its continuous-time architecture and integrated digital decimation filter.

How does the ADAR7251 synchronize with external ramps in radar applications?

The device uses the CONV_START input and DATA_READY output signals to synchronize the ADC conversion process with an external ramp, which is essential for FSK-FMCW radar timing.