Description:The VRE305 series of low cost, zener-based precision Integrated Circuits provides ultra-stable +5V output with ±0.5mV (.01%) initial accuracy. This improvement in accuracy is made possible by a unique proprietary multipoint laser compensation technique. Significant improvements have been made in other performance parameters, including warm-up drift, line regulation, and long-term stability, to make this series the most accurate and stable references available in an industry standard 8-pin SMT or DIP package
Apex Microtechnology recommends a 4-layer PCB with a solid ground plane, and a thermal pad connected to a heat sink or a thermal relief pattern to ensure efficient heat dissipation. A minimum of 1 oz copper thickness is recommended for the PCB.
To ensure proper biasing, Apex recommends using a voltage regulator to maintain a stable voltage supply, and to follow the recommended biasing circuit topology shown in the datasheet. Additionally, the input and output stages should be properly terminated to minimize reflections and ensure optimal linearity.
Apex recommends using a 50 ohm input termination resistor in series with a 10nF capacitor to ensure optimal input impedance matching. For output termination, a 50 ohm resistor in series with a 10nF capacitor is recommended to minimize reflections and ensure optimal output impedance matching.
To minimize EMI and RFI, Apex recommends using a shielded enclosure, keeping the device away from high-frequency sources, and using a common-mode choke or ferrite bead on the input and output lines. Additionally, a low-pass filter can be used to attenuate high-frequency noise.
The recommended operating temperature range for the VRE305AD is -40°C to +85°C. However, Apex recommends derating the device's power dissipation and output current at higher temperatures to ensure reliable operation.
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VRE305AD Overview
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