Adum7703 is a high-performance second-order regulator with Integrated Low Dropout (LDO) Σ-Δ Analog to digital converter (ADC) with icoupler based on ADI company ® The on-chip digital isolation function of the technology can convert the analog input signal into a high-speed one bit data stream. The device is powered by 4.5V to 20V power supply (vdd1) and can accept ± 250Mv (± 320mv full scale) Pseudo differential input signal. The Pseudo differential input is suitable for parallel voltage monitoring in high voltage applications requiring electrical isolation.

The analog input is continuously sampled by a high-performance analog modulator and converted into a 1-density digital output stream with a data rate of up to 21mhz. The original information can be reconstructed using an appropriate sinc3 digital filter to achieve a signal-to-noise ratio (SNR) of 86db at a 256 decimation rate and a 20MHz master clock at 78.1ksps. The serial inputs and outputs operate using a 5V or 3.3V power supply (VDD2).

The serial interface adopts digital isolation. The combination of high-speed complementary metal oxide semiconductor (CMOS) technology and integral transformer technology can realize on-chip isolation, so as to provide better performance characteristics than alternatives such as optocoupler devices. The adum7703 device is packaged in a 16 pin wide body SOIC (operating temperature range − 40 ° C to + 125 ° C) and an 8-pin wide body SOIC (operating temperature range − 40 ° C to + 105 ° C).

High performance second order Σ-Δ Function and application scope of analog-to-digital converter adum7703

Application:

Shunt current monitoring

AC motor control

Power supply and solar inverter

Wind turbine inverter

Module and optical isolator replacement

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