ADAR7251

Data Sheet 4-Channel, 16-Bit, Continuous Time Data Acquisition ADC ADAR7251 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 Internal oscillator/PLL input: 16 MHz to 54 MHz High speed serial data interface SPI control 2 general-purpose inputs/outputs 48-lead LFCSP_SS package Temperature range: −40°C to +125°C Single supply operation of 3.3 V Qualified for automotive applications APPLICATIONS Automotive LSR systems Data acquisition systems GENERAL DESCRIPTION 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 exter...