## Overview of ADP7112ACBZ-1.8-R7 The **ADP7112ACBZ-1.8-R7** is a high-performance, low dropout (LDO) linear regulator manufactured by Analog Devices. It is designed to provide a stable 1.8V output from a wide input voltage range, specifically optimized for high-performance analog and mixed-signal circuits. --- ### Key Specifications | Feature | Specification | | :--- | :--- | | **Output Voltage** | Fixed 1.8V | | **Input Voltage Range** | 3.3V to 20V | | **Maximum Output Current** | 200 mA | | **Dropout Voltage** | 200 mV (typical at 200 mA load) | | **PSRR (Power Supply Rejection Ratio)** | 88 dB at 10 kHz; 50 dB at 1 MHz | | **Output Noise** | 11 µV rms (10 Hz to 100 kHz) | | **Package Type** | 6-ball WLCSP (Wafer Level Chip Scale Package) | | **Operating Temperature** | -40°C to +125°C | --- ### Technical Components and Features 1. **Low Noise Performance:** The device is engineered for ultra-low noise, making it ideal for powering sensitive components like ADCs, DACs, and precision amplifiers where power supply noise can degrade signal integrity. 2. **High PSRR:** Its high Power Supply Rejection Ratio (PSRR) allows it to effectively filter out high-frequency ripple from switching regulators located upstream in the power chain. 3. **Precision Enable Input:** The `EN` pin allows the device to be turned on or off. It has a precision threshold, enabling it to be used for sequencing or as a programmable UVLO (Under Voltage Lockout). 4. **Protection Circuitry:** * **Thermal Overload Protection:** Prevents damage from excessive heat. * **Short-Circuit Protection:** Limits current in the event of a fault. * **Reverse Current Protection:** Protects the internal pass transistor if the output voltage becomes higher than the input voltage. --- ### Typical Application Circuit To ensure stability, the ADP7112 requires minimal external components: ```text Input (3.3V - 20V) ----[ C_IN 2.2µF ]----| VIN VOUT |----[ C_OUT 2.2µF ]---- Output (1.8V) | EN | | GND | ``` * **Capacitors:** It is stable with small 2.2 µF ceramic output capacitors. Low ESR (Equivalent Series Resistance) is recommended for optimal performance. --- ### Applications * Regulation to noise-sensitive applications (ADC, DAC, RF). * Communications and infrastructure. * Medical and healthcare equipment. * Industrial and instrumentation.