## Technical Overview: ADR5045BKSZ-R2 The **ADR5045BKSZ-R2** is a high-precision, shunt-mode voltage reference manufactured by **Analog Devices**. It is designed for space-constrained applications that require high stability and low power consumption. ### 1. Key Technical Specifications | Parameter | Value / Description | | :--- | :--- | | **Output Voltage ($V_{out}$)** | 5.0 V | | **Initial Accuracy** | ±0.1% (5 mV) | | **Temperature Coefficient** | 75 ppm/°C | | **Operating Current Range** | 60 µA to 15 mA | | **Package Type** | SC70-3 (Small Outline Transistor) | | **Operating Temperature** | -40°C to +125°C | | **Output Noise** | 240 µV p-p (0.1 Hz to 10 Hz) | --- ### 2. Functional Characteristics The ADR5045 belongs to the **ADR504x family** of precision shunt references. Unlike series references, shunt references operate similarly to a Zener diode, maintaining a constant voltage by "shunting" excess current to ground. * **No Output Capacitor Required:** This device is stable without an external output capacitor, which saves PCB space and reduces costs. * **Low Power Consumption:** With a minimum operating current of only 60 µA, it is ideal for battery-powered handheld devices. * **Small Footprint:** The SC70 package is approximately 50% smaller than the standard SOT-23 package. --- ### 3. Pin Configuration (SC70-3) | Pin No. | Name | Description | | :--- | :--- | :--- | | 1 | **$V_{out}$** | Output Voltage / Cathode Connection | | 2 | **NC** | No Connect (Should be left floating or grounded) | | 3 | **GND** | Ground / Anode Connection | --- ### 4. Typical Application Circuit To use the ADR5045, you must place a current-limiting resistor ($R_{set}$) between the input voltage source and the $V_{out}$ pin. ```text Input (Vin) ----[ Rset ]----+---- Output (5.0V) | [ADR5045] | Ground ``` **Formula for $R_{set}$:** $$R_{set} = \frac{V_{in} - V_{out}}{I_{load} + I_{q}}$$ *(Where $I_{q}$ is the operating current of the ADR5045, typically > 60 µA).* --- ### 5. Common Use Cases 1. **Precision Data Acquisition:** Providing a stable reference for 12-bit or 16-bit ADCs. 2. **Portable Instrumentation:** Due to the ultra-low 60 µA minimum current requirement. 3. **Industrial Process Control:** Reliable operation in harsh temperature environments (-40°C to +125°C). 4. **Power Supply Monitoring:** Used as a reference for voltage supervisors.