## Detailed Technical Analysis: ADR5045BRTZ-R2 The **ADR5045BRTZ-R2** is a high-precision shunt mode voltage reference manufactured by **Analog Devices**. It is designed specifically for space-constrained applications requiring high stability and low power consumption. --- ### 1. General Specifications | Feature | Description | | :--- | :--- | | **Output Voltage** | 5.0 V | | **Reference Type** | Shunt (Two-terminal Zener-style) | | **Initial Accuracy** | ±0.1% (High Precision) | | **Temperature Coefficient** | 75 ppm/°C | | **Operating Current Range** | 50 µA to 15 mA | | **Package Type** | SOT-23-3 | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Key Electronic Characteristics #### A. Shunt Configuration Unlike series references, the ADR5045 operates like a Zener diode. It maintains a constant 5.0V across its terminals by adjusting its internal resistance. This makes it ideal for: * **Negative Voltage References:** Can easily be configured for negative rails. * **Wide Input Range:** Since it is current-driven, it can handle high input voltages as long as an appropriate external resistor is used. #### B. Low Power Consumption With a minimum operating current of only **50 µA**, this part is highly efficient for battery-powered handheld devices. It does not require an external output capacitor for stability, saving additional PCB space. #### C. Thermal Stability The "B" grade (ADR5045B) indicates the higher precision tier, offering better temperature drift performance (75 ppm/°C) compared to the standard "A" grade. --- ### 3. Application Circuit Example To use the ADR5045, an external resistor ($R_{bias}$) is required to set the operating current. ```python # Formula for selecting the bias resistor: # Rbias = (Vin_min - Vout) / (I_load_max + I_shunt_min) Vin_min = 12.0 # Minimum Input Voltage Vout = 5.0 # Reference Voltage I_shunt_min = 0.0001 # 100uA for safety margin # Resulting Rbias calculation would go here. ``` --- ### 4. Common Applications * **Precision Data Acquisition:** Used as a reference for 12-bit and 16-bit ADCs/DACs. * **Industrial Process Control:** Current loop monitoring (4-20mA). * **Portable Instrumentation:** Battery monitors and handheld multimeters. * **Power Supplies:** Error amplifier reference in switching regulators. ---