iC-NQI TSSOP20

13-Bit Sin/D Converter with Calibration

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Product description

iC-NQI is a real-time vector-tracking sine/cosine-to-digital converter featuring an angle resolution of up to 8192.

The absolute angle and period counter data is output at a fast serial interface (BiSS B or SSI protocol) with almost no latency, or as an incremental encoder quadrature signal with index. The signal-conditioning analog front-end takes differential or single-ended signals and allows the correction of common signal errors. The signals are monitored and can trigger error and warning messages.

Features

  • Resolution of up to 8192 angle steps per sine/cosine period
  • Binary and decimal resolution settings, e.g. 500, 512, 1000, 1024; programmable angle hysteresis
  • Conversion time of just 250 ns including amplifier settling
  • Count-safe vector follower principle, real-time system with a 70 MHz sampling rate
  • Direct sensor connection; selectable input gain
  • Front-end signal conditioning features offset (8 bits), amplitude ratio (5 bits) and phase (6 bits) calibration
  • Input frequency of up to 250 kHz
  • Incremental A QUAD B outputs with a selectable minimum transition distance (e.g. 0.25 µs for 1 MHz at A)
  • Index signal processing adjustable in position and width
  • Serial output of absolute angle data at clock rates of up to 10 MHz
  • Error monitoring: frequency, amplitude, configuration (CRC)
  • Multiturn counting up to 24 bits
  • Device setup from serial EEPROM or 2-wire interface
  • ESD protection and TTL-/CMOS-compatible outputs

Applications

  • Interpolator IC for position data acquisition from analog sine/cosine sensors
  • Optical linear/rotary encoders
  • MR sensor systems
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