### Overview of ADP7112ACBZ-1.2-R7 The **ADP7112ACBZ-1.2-R7** is a high-performance, low dropout (LDO) linear regulator produced by Analog Devices. It is specifically designed to operate from high input voltages (up to 20V) while providing high output accuracy and very low noise. --- ### Technical Specifications | Parameter | Specification | | :--- | :--- | | **Input Voltage Range** | 3.3 V to 20 V | | **Output Voltage (Fixed)** | 1.2 V | | **Maximum Output Current** | 200 mA | | **Dropout Voltage** | 200 mV (typical at 200 mA load) | | **Quiescent Current ($I_Q$)** | 50 $\mu$A (typical at no load) | | **PSRR (Power Supply Rejection Ratio)** | >60 dB at 10 kHz; 40 dB at 1 MHz | | **Noise** | 11 $\mu$V rms (10 Hz to 100 kHz) | | **Package Type** | 6-ball WLCSP (Wafer Level Chip Scale Package) | --- ### Key Features * **Low Noise Performance:** Ideal for noise-sensitive analog circuits, such as high-speed ADCs or RF components. * **High PSRR:** Effectively filters out ripples from switching power supplies, ensuring a clean DC output. * **Precision Accuracy:** Offers ±0.8% accuracy over line, load, and temperature variations. * **Small Form Factor:** The WLCSP package makes it suitable for space-constrained applications like smartphones or wearable tech. * **Protection Circuitry:** Includes internal thermal overload protection and short-circuit current limiting. --- ### Pin Configuration & Functionality | Pin Ball | Mnemonic | Description | | :--- | :--- | :--- | | **A1** | VIN | Regulator Input Supply. | | **A2** | VOUT | Regulated Output Voltage (1.2V). | | **B1** | EN | Enable Input. Drive high to turn on the regulator. | | **B2** | GND | Ground. | | **C1, C2** | NC/Reserved | No internal connection or used for thermal stability. | --- ### Typical Application Circuit To ensure stability and performance, external capacitors are required. ```markdown VIN ----[ 2.2µF Cap ]----( VIN Pin ) ( VOUT Pin )----[ 2.2µF Cap ]---- VOUT (1.2V) ( EN Pin ) <--- Logic Control ( GND Pin ) ---- Ground ``` * **Input Capacitor:** A 2.2 $\mu$F ceramic capacitor is recommended to improve transient response. * **Output Capacitor:** A 2.2 $\mu$F ceramic capacitor (ESR < 0.3 $\Omega$) is required for stability. --- ### Target Applications 1. **ADC/DAC Powering:** Providing clean rails for precision converters. 2. **RF/Wireless:** Powering low-noise amplifiers (LNAs) and oscillators. 3. **Medical Imaging:** Used in portable ultrasound or scanning equipment. 4. **Industrial:** High-voltage sensors and instrumentation.