The **ADP7142AUJZ-R7** is a high-performance, low dropout (LDO) linear regulator manufactured by Analog Devices. It is designed to provide ultra-low noise and high Power Supply Rejection Ratio (PSRR) for sensitive analog and mixed-signal circuits. --- ### ## Technical Specifications The following table summarizes the key electrical characteristics of the device: | Feature | Specification | | :--- | :--- | | **Input Voltage Range** | 2.7 V to 40 V | | **Maximum Output Current** | 200 mA | | **Output Voltage Options** | Fixed (1.2V to 5V) or Adjustable (1.2V to $V_{IN} - V_{DO}$) | | **Dropout Voltage** | 200 mV (typical at 200 mA load) | | **PSRR** | 60 dB at 10 kHz; 40 dB at 1 MHz | | **Low Noise** | 11 μV rms (10 Hz to 100 kHz) | | **Package Type** | 5-lead TSOT (Thin SOT-23) | | **Operating Temperature** | -40°C to +125°C | --- ### ### Key Components and Features 1. **Wide Input Voltage Range (Up to 40V):** Unlike standard LDOs that often cap at 5.5V or 12V, this part can handle high-voltage industrial rails, making it ideal for regulating 24V or 28V systems down to low-voltage logic. 2. **Ultra-Low Noise:** The 11 μV rms noise floor ensures that it does not interfere with sensitive components like Analog-to-Digital Converters (ADCs), Digital-to-Analog Converters (DACs), or high-precision amplifiers. 3. **High PSRR:** The high Power Supply Rejection Ratio means the chip is excellent at filtering out "ripple" or noise coming from an upstream switching power supply (DC-DC converter). 4. **Soft Start Capability:** It includes internal circuitry to control the output voltage ramp-up, which reduces inrush current during startup. --- ### ### Typical Application Circuit To use the adjustable version of the ADP7142, a simple resistor divider is required: ```python # Conceptual Pinout Connections # VIN -> Input Voltage (with 2.2uF Capacitor to GND) # GND -> System Ground # EN -> Enable Pin (High = On, Low = Off) # SENSE -> Feedback for Fixed / ADJ pin for Adjustable # VOUT -> Regulated Output (with 2.2uF Capacitor to GND) ``` --- ### ### Common Use Cases * **Industrial Automation:** Sensor power supplies and PLC modules. * **Medical Equipment:** Low-noise power for imaging and diagnostic tools. * **Precision Instrumentation:** Powering high-resolution data converters. * **Automotive:** Post-regulation for high-voltage battery rails.