The **ADR5041AKSZ-R2** is a high-precision shunt mode voltage reference designed by Analog Devices. It is widely used in space-constrained applications that require a stable voltage output despite fluctuations in temperature or input current. --- ### 1. Key Technical Specifications The following table highlights the core electrical characteristics of the ADR5041AKSZ-R2: | Parameter | Specification | | :--- | :--- | | **Output Voltage ($V_{out}$)** | 2.500 V | | **Initial Accuracy** | ±0.1% (Grade A) | | **Temperature Coefficient** | 100 ppm/°C | | **Operating Current Range** | 50 µA to 15 mA | | **Output Noise (0.1 Hz to 10 Hz)** | 125 µV p-p | | **Package Type** | SC70-3 (KSZ) | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Functional Description The device operates as a **Shunt Regulator** (similar to a high-precision Zener diode). It maintains a constant voltage across its terminals by varying the amount of current it shunts to ground. #### How it works: 1. **Shunt Configuration:** Unlike series references, this device requires an external resistor ($R_{bias}$) placed between the input voltage and the reference pin. 2. **Regulation:** It absorbs more or less current to ensure the voltage drop across the load remains exactly 2.5V. 3. **No Output Capacitor Required:** The ADR5041 is designed to be stable without an external output capacitor, saving board space, though it can handle capacitive loads if necessary. --- ### 3. Pin Configuration (SC70-3) The SC70 package is extremely small, making it ideal for portable electronics. | Pin No. | Name | Function | | :--- | :--- | :--- | | **1** | **K** | Cathode (Positive Terminal) | | **2** | **NC** | No Connect (Leave floating) | | **3** | **A** | Anode (Negative/Ground Terminal) | --- ### 4. Typical Applications * **Precision Data Acquisition:** Providing a stable reference for ADCs (Analog-to-Digital Converters). * **Battery-Powered Equipment:** Due to its low minimum operating current (50 µA). * **Industrial Process Control:** Used in 4-20 mA loops and sensor transmitters. * **Portable Instrumentation:** Multimeters and handheld testing gear. --- ### 5. Circuit Implementation Example To use the ADR5041, you must calculate the bias resistor ($R_{S}$) based on your input voltage ($V_{S}$): ```text Formula: Rs = (Vs - Vout) / (I_load + I_shunt) Example: If Vs = 5V, Vout = 2.5V, and desired current is 1mA: Rs = (5V - 2.5V) / 0.001A = 2500 Ohms (2.5kΩ) ```