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