The **ADR5045AKSZ-R2** is a high-precision shunt voltage reference manufactured by Analog Devices. It is designed for space-constrained applications requiring high stability and low power consumption. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical characteristics of the ADR5045AKSZ-R2: | Parameter | Specification | | :--- | :--- | | **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 (KS-3) | | **Operating Temperature** | -40°C to +125°C | | **Output Noise** | 240 µV p-p (0.1 Hz to 10 Hz) | --- ### 2. Functional Description As a **Shunt Voltage Reference**, this device operates similarly to a Zener diode but with significantly better performance. * **Regulation:** It maintains a constant 5.0V across its terminals by adjusting its internal resistance to shunt excess current to ground. * **No Output Capacitor Required:** Unlike many LDOs or series references, the ADR5045 is stable without an external output capacitor, saving PCB space. * **Minimum Current:** It requires at least 60 µA to maintain regulation, making it ideal for battery-powered or low-power sensors. --- ### 3. Pin Configuration (SC70-3) The device is housed in a tiny 3-pin surface-mount package. | Pin Number | Symbol | Function | | :--- | :--- | :--- | | 1 | **+** | Positive Terminal (Cathode) | | 2 | **-** | Negative Terminal (Anode) | | 3 | **NC** | No Connect (Should be left floating) | --- ### 4. Typical Application Circuit To use the ADR5045, an external resistor ($R_{bias}$) must be placed between the input supply ($V_{in}$) and the reference to limit the current. ```text V_in (Supply) | [R_bias] | +------- V_out (5.0V) | | [ADR5045] [Load] | | GND GND ``` **Formula for $R_{bias}$:** $$R_{bias} = \frac{V_{in} - V_{out}}{I_{load} + I_{quiescent}}$$ --- ### 5. Common Use Cases * **Precision Data Acquisition:** Providing a stable reference for 12-bit or 14-bit ADCs/DACs. * **Industrial Process Control:** Current loops (4-20mA) and instrumentation. * **Portable Equipment:** Battery monitoring due to the low 60 µA minimum operating current. * **Space-constrained PCB designs:** Using the ultra-small SC70 footprint.