## AD1585ARTZ-R2: Low Power, Precision Voltage Reference The **AD1585ARTZ-R2** is a precision, low-power, bandgap voltage reference part of the AD158x family manufactured by **Analog Devices**. It is designed to provide a highly stable output voltage regardless of changes in temperature or input supply. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Output Voltage ($V_{out}$)** | 5.0 V | | **Input Voltage Range** | 5.1 V to 12.0 V | | **Initial Accuracy** | ±0.1% (5 mV) | | **Temperature Coefficient** | 50 ppm/°C | | **Supply Current** | 65 µA (Typical) | | **Package Type** | SOT-23-3 | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Functional Description The AD1585 is a **series mode** voltage reference. Unlike shunt references that require an external resistor, series references operate like low-dropout regulators (LDOs), drawing only the current required by the load plus a small quiescent current. #### Core Internal Components: * **Bandgap Core:** The heart of the chip that generates the stable 5.0V potential. * **Error Amplifier:** Compares the output to the internal reference to maintain regulation. * **PTAT (Proportional To Absolute Temperature) Circuitry:** Compensates for temperature-induced drift. --- ### 3. Pin Configuration The device is housed in a small 3-lead SOT-23 package, making it ideal for space-constrained applications. | Pin Number | Name | Function | | :---: | :--- | :--- | | 1 | **$V_{in}$** | Input Supply Voltage | | 2 | **$V_{out}$** | Reference Output Voltage | | 3 | **GND** | Ground | --- ### 4. Application Use Cases * **Data Acquisition Systems:** Provides a stable reference for Analog-to-Digital Converters (ADCs) and Digital-to-Analog Converters (DACs). * **Precision Instrumentation:** Used in handheld meters and sensors where battery life is critical due to its low 65 µA current draw. * **Industrial Process Control:** Reliable operation in harsh temperature environments up to 125°C. --- ### 5. Implementation Example To ensure stability and noise reduction, a bypass capacitor is recommended at the output. ```c // Typical Connection Logic // Vin ---- [ 5.1V - 12V ] // Vout ---- [ 0.1uF Capacitor to GND ] ----> ADC Reference Pin // GND ---- [ System Ground ] ```