ADuM7801

The ADuM7801 is a high-performance isolated analog-to-digital converter (ADC) with a second-order Σ-Δ modulator that converts an analog input signal into a high speed, single-bit data stream, with on-chip digital isolation based on Analog Devices, Inc., iCoupler ^® technology. The device operates from a 4.0V to 5.5V power supply range (high-side supply voltage, V_DD1) and accepts a pseudodifferential input signal of ±250mV (±320mV full-scale). The pseudodifferential input is ideally suited for shunt-resistor current monitoring in high voltage applications where galvanic isolation is required.

The analog input is continuously sampled by a high-performance analog modulator and converted to a pulse density modulation digital output stream with a data rate of up to 26MHz. The analog input can be reconstructed with an appropriate sinc3 digital filter to achieve an 88dB signal-to-noise ratio (SNR) at 97.6kSPS with a 256 decimation rate and a 25MHz input clock. The serial input and output operates from a 3V to a 5.5V supply (controller-side supply voltage, V_DD2).

The serial interface is digitally isolated. High speed complementary metal-oxide semiconductor (CMOS) technology, combined with monolithic transformer technology, results in the on-chip isolation providing outstanding performance characteristics, superior to alternatives such as optocoupler devices.

The ADuM7801 device is available in a 8-lead SOIC_IC package and has an operating temperature range of −40°C to +125°C.

APPLICATIONS

• Shunt current monitoring
• AC motor controls
• Power and solar inverters
• Wind turbine inverters
• Analog-to-digital and opto-isolator replacement