## ADR5041WBRTZ-R7: Technical Overview The **ADR5041WBRTZ-R7** is a precision shunt voltage reference manufactured by **Analog Devices**. It is designed specifically for high-accuracy applications where stability and space-saving are critical. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical characteristics of the component: | Parameter | Specification | | :--- | :--- | | **Output Voltage ($V_{out}$)** | 1.225 V | | **Initial Accuracy** | ±0.2% (Grade B) | | **Temperature Coefficient** | 75 ppm/°C | | **Operating Current Range** | 50 µA to 15 mA | | **Output Noise (0.1 Hz to 10 Hz)** | 30 µV p-p | | **Package Type** | SOT-23-3 | | **Automotive Qualified** | Yes (AEC-Q100) | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Functional Description #### Shunt Configuration Unlike series regulators, the ADR5041 operates as a **shunt reference** (similar to a Zener diode). It maintains a constant voltage across its terminals by varying the amount of current it shunts to ground. This makes it ideal for: * Floating applications. * Systems with widely varying supply voltages. #### Precision and Stability The device uses a proprietary curvature correction design to minimize the voltage drift over the automotive temperature range. It does not require an external output capacitor for stability, which saves PCB real estate, though it remains stable with capacitive loads. --- ### 3. Pin Configuration (SOT-23) | Pin No. | Mnemonic | Description | | :--- | :--- | :--- | | 1 | **V+** | Positive terminal of the shunt reference. | | 2 | **V-** | Negative terminal (Ground). | | 3 | **NC** | No Connect (Leave floating or tie to GND). | --- ### 4. Part Number Breakdown Understanding the suffix codes for this specific variant: * **ADR5041**: Base part number (1.225V output). * **W**: Automotive Grade (Qualified for AEC-Q100). * **B**: Accuracy Grade (±0.2% initial accuracy). * **RTZ**: Package code for SOT-23-3. * **R7**: Tape and Reel packaging (7-inch reel). --- ### 5. Application Circuit Example To use the ADR5041, a current-limiting resistor ($R_{S}$) must be placed between the input voltage ($V_{S}$) and the reference. ```text V_supply (In) | [ R_s ] <-- Current Limiting Resistor | +------> V_out (1.225V) | [ADR5041] | GND ``` The resistor value is calculated as: $$R_S = \frac{V_{supply\_min} - V_{out}}{I_{load\_max} + I_{ref\_min}}$$ --- ### 6. Common Applications * **Automotive Systems:** Battery monitoring and sensor signal conditioning. * **Data Converters:** Precise reference for 8-bit to 12-bit ADCs. * **Portable Equipment:** Due to the low minimum operating current (50 µA). * **Precision Current Sources:** Used as a stable voltage drop reference.