Basic connection circuit of signal and power supply composed of ISOll3

The figure shows the basic connection circuit of ISO113 signal and power supply. Each power supply terminal must have a bypass filter. When the output current of the isolated power supply is greater than ±15mA, it is recommended that the power supply pin adopts a type filter such as the VCC1 pin externally connected. The isolated rectifier output pin (±Vcc2) and the amplifier input power supply pin (±Vc) can be equipped with a ripple filter or calibrator. The Com1 pin is connected to the signal source ground, and the Sense pin is connected to the upper end of the load to reduce the error caused by the voltage drop caused by the long wire transmission. Gnd1 is connected to Com1, and VOUT is connected to Sense on the socket, otherwise the TTL low level will prohibit the internal DC-DC converter from working. The internal transformer-coupled DC/DC converter is powered by the input terminal of the isolation amplifier, and all power supply pins have a 0.1μF capacitor connected to ground.