16-Channel DAS with 16-Bit, Bipolar Input, Dual Simultaneous Sampling ADC

The AD7616 is a 16-bit, DAS that supports dual simultaneous sampling of 16 channels. The AD7616 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 90.5 dB SNR. Higher SNR performance can be achieved with the on-chip oversampling mode (92 dB for an oversampling ratio (OSR) of 2).

The input clamp protection circuitry can tolerate voltages up to ±21 V. The AD7616 has 1 MÙ 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, 16-bit charge redistribution 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 AD7616 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)

* 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 VDRIVE 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 16-bit successive approximation register (SAR) ADC

* Throughput rate: 2 × 1 MSPS

* Oversampling capability with digital filter

* Flexible sequencer with burst mode