Programmable_Zener_voltage_reference

Published:2009/7/24 20:07:00 Author:Jessie | From:SeekIC

In this circuit, an ICL8212 stimulates a Zener diode by connecting the output terminal (pin 4) to the VZ output, and using a resistor network connected at the VTH terminal (pin 3) to program the Zener voltage. Power (V+) is applied to pin 8, with pin 5 connected to ground. The zener voltage is calculated by: Because there is no internal compensation, the 5-μF capacitor is required across the output to prevent oscillation. Zener voltages from 2 to 30 V can be programmed. Typical impedance values between 300 μA and 25 mA range from 4 to 7Ω. The Zener knee is sharper and occurs at a significantly lower current than similar devices.



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