VIA0250DD www.vishay.com Vishay Semiconductors FUNCTION DESCRIPTION Overview The VIA0250DD is a high performance isolated amplifier that accept fully-differential input. The fully-differential input is ideally suited to shunt current monitoring in high voltage applications where isolation is required. The analog input is continuously sampled by a second-order - modulator in the device, which is driven by a pre-stage fully-differential amplifier in the device. With the internal voltage reference and clock generator, the modulator convert the analog input signal to a digital bitstream. The output of the modulator is transferred by the drivers (called TX in the functional block diagram) across the isolation barrier that separates the isolated side 1 and side 2 voltage. The received bitstream and clock are synchronized and processed, as shown in the functional block diagram, by a fourth-order analog filter on the side 2 and has a differential output. V V DD1 DD2 V detection DD1 Reference Reference INP Retiming and 4th - OUTP Σ-Δ modulator TX RX order active low pass OUTN filter INN Isolation Barrier RX TX Oscillator V detection CM GND GND 1 2 Fig. 24 - Function Block Diagram Analog Input Below mentioned are the restrictions on the analog input signal (VIN). 1. If the input voltage exceeds the range GND1 - 6 V to VDD1 + 0.5 V, the input current must be limited to 10 mA because the device input electrostatic discharge (ESD) diodes turn on 2. The linearity and noise performance of the device are ensured only when the analog input voltage remains within the specified linear full-scale range (FSR) and within the specified common-mode input voltage range Rev. 1.2, 02-Apr-2025 10 Document Number: 80901 For technical questions, contact: optocoupleranswers@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
