The **ADP7142ACPZN3.3-R7** is a high-performance, low dropout (LDO) linear regulator manufactured by Analog Devices. It is specifically designed to provide a very clean and stable 3.3V output for sensitive analog and mixed-signal circuits. --- ### ## Key Technical Specifications The following table outlines the primary electrical characteristics of the ADP7142ACPZN3.3-R7: | Parameter | Specification | | :--- | :--- | | **Output Voltage (Fixed)** | 3.3 V | | **Input Voltage Range** | 2.7 V to 40 V | | **Maximum Output Current** | 200 mA | | **Dropout Voltage** | 200 mV (typical at 200 mA) | | **PSRR (Power Supply Rejection Ratio)** | 80 dB at 1 kHz; 60 dB at 100 kHz | | **Low Noise** | 11 µV rms (10 Hz to 100 kHz) | | **Package Type** | 6-lead LFCSP (2mm x 2mm) | | **Operating Temperature** | -40°C to +125°C | --- ### ## Core Features and Components 1. **High Input Voltage Range:** Unlike standard 5V or 12V LDOs, this part can handle up to **40V** at the input. This makes it ideal for industrial systems where high-voltage rails are common. 2. **Ultra-Low Noise:** The internal circuitry is optimized to produce minimal thermal noise. This is critical for powering high-resolution Analog-to-Digital Converters (ADCs) or Radio Frequency (RF) components. 3. **High PSRR:** It is highly effective at filtering out ripples/noise from the input power supply, ensuring that the 3.3V output remains steady even if the input source is "dirty." 4. **Precision Enable (EN):** Includes an enable pin that allows the chip to be shut down via a logic signal to save power (quiescent current drops to less than 1 µA in shutdown). 5. **Soft Start Capability:** Reduces inrush current during startup, preventing sudden voltage dips on the input rail. --- ### ## Typical Application Circuit To operate this LDO, only a few external capacitors are required to ensure stability and noise filtering. ```mermaid graph LR Vin[Input Voltage] --> C1[1uF Ceramic Cap] C1 --> LDO[ADP7142] LDO --> C2[2.2uF Ceramic Cap] C2 --> Vout[3.3V Clean Output] ``` ### ## Part Number Breakdown * **ADP7142:** The base model family. * **ACPZ:** Denotes the lead-free (RoHS compliant) LFCSP package. * **N3.3:** Indicates the fixed **3.3V** output version. * **R7:** Refers to the packaging format (7-inch Tape and Reel, typically 1500 units). ---