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 ±21V. The AD7617 has 1 MΩ analogue 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 analogue input clamp protection, a dual, 14-bit charge-redistribution successive approximation register (SAR) ADC, a flexible digital filter, a 2.5V reference and reference buffer, and high speed serial and parallel interfaces. The AD7617 is serial peripheral interface (SPI)/QSPI/DSP/MICROWIRE compatible. Use it, ADI suggests, in power line monitoring; protective relays; multiphase motor control; and in instrumentation and control systems.
Next page – feature listing…