Analog Devices AD7617 Product Info

• 16-channel, dual, simultaneously sampled inputs
• Independently selectable channel input ranges
  • True bipolar: ±10 V, ±5 V, ±2.5 V
• Single 5 V analog supply and 2.3 V to 3.6 V V_DRIVE supply
• Fully integrated data acquisition solution
  • Analog input clamp protection
  • Input buffer with 1 MΩ analog input impedance
  • First-order antialiasing analog filter
  • On-chip accurate reference and reference buffer
  • Dual 14-bit SAR ADC
  • Throughput rate: 2× 1 MSPS per channel pair
  • Oversampling capability with digital filter
  • Flexible sequencer with burst mode
• Flexible parallel/serial interface
  • SPI/QSPI/MICROWIRE/DSP compatible
  • Optional CRC error checking
• Hardware/software configuration
• Performance
  • 85.3 dB typical SNR at 500 kSPS (2× oversampling)
  • 85 dB typical SNR at 1 MSPS
  • −103 dB typical THD at ±10 V range
  • ±0.3 LSB INL (typical), ±0.99 LSB DNL (maximum)
  • 8 kV ESD analog input pins only
• On-chip self detect function
• 80-lead LQFP package

The AD7617 is a 14-bit, DAS that supports dual simultaneous sampling of 16 channels. The AD7617 operates from a single +5 V supply and can accommodate ±10 V, ±5 V, and ±2.5 V true bipolar input signals while sampling at throughput rates up to 1 MSPS per channel pair with 85 dB signal-to-noise ratio (SNR). Higher SNR performance can be achieved with the on-chip oversampling mode (85.3 dB for an oversampling ratio (OSR) of 2).

The input clamp protection circuitry can tolerate voltages up to ±21 V. The AD7617 has 1 MΩ analog input impedance, regardless of sampling frequency. The single-supply operation, on-chip filtering, and high input impedance eliminate the need for driver op amps and external bipolar supplies.

The device contains analog input clamp protection, a dual, 14-bit charge redistribution successive approximation register (SAR) analog-to-digital converter (ADC), a flexible digital filter, a 2.5 V reference and reference buffer, and high speed serial and parallel interfaces. The AD7617 is serial peripheral interface (SPI)/QSPI^™/DSP/MICROWIRE compatible.

Applications

• Power line monitoring
• Protective relays
• Multiphase motor control
• Instrumentation and control systems
• Data acquisition systems (DASs)