ADR3530WBRMZ-R7

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ADR3530WBRMZ-R7 is a voltage reference chip from the PMIC - Voltage Reference family. This device provides a stable and accurate input or output reference voltage in battery-operated systems.

Description

ADR3530WBRMZ-R7 is a low power, low noise, high precision, low dropout voltage reference device. It is designed to replace several single-ended zeners, opto-couplers, or other voltage reference sources in powering a system-level A/D or D/A converter. The device is designed to provide a stable and accurate output reference voltage while consuming less than 1 µA of operating current, allowing designers to reduce the battery size and extend the battery life. The reference voltage of ADR3530WBRMZ-R7 is programmed externally by a resistor divider.

Features

• Operating Voltage Range: 2.4V – 5.5V
• Low Dropout Voltage: Lower than 0.4V
• Low Noise: Lower than 30uV_PP
• High Accuracy: ±1.5% (at 25°C)
• Low Power Dissipation: Less than 1uA
• Ultralow Temperature Drift: 0.05%/°C

Applications

• Remote monitoring applications
• Medical devices
• Portable wireless sensors
• Battery-operated devices
• System-level DACs and ADCs

Working Principle

The unit outputs a stable reference voltage that is externally programmed by a resistor divider as VOUT = VREF/R2 in which, VREF is the reference voltage of 2.048V and R2 is a divider resistor network. The circuitry of the ADR3530WBRMZ-R7 generates the reference voltage by comparing an internal reference of 2.048 volts and the voltage from the resistor divider. When the voltage fed from the resistor divider is higher than internal reference, current is fed from the output to keep the VOUT to fall back to 2.048 volts. When the voltage fed from resistor divider is lower than the internal reference, current is poured from the input to keep the output voltage rises back to 2.048 volts. This feedback loop keeps the reference voltage at a very stable level.

Conclusion

ADR3530WBRMZ-R7 allows designers to reduce the battery size, extend the battery life and achieve high system accuracy. Its low power dissipation and ultralow temperature drift performance makes it ideal for use in battery-operated devices. It provides a stable and accurate output reference voltage to optimize the performance of system-level analog-to-digital converters and digital-to-analog converters.

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