The **ADP7118ARDZ-2.5-R7** is a high-performance CMOS, low dropout (LDO) linear regulator. It is designed for applications requiring very low noise and high power supply rejection ratios (PSRR) to power sensitive analog and mixed-signal components. --- ## 1. Technical Specifications Below are the primary electrical characteristics of the device: | Parameter | Specification | | :--- | :--- | | **Input Voltage Range** | 2.7 V to 20 V | | **Output Voltage (Fixed)** | 2.5 V | | **Maximum Output Current** | 200 mA | | **Dropout Voltage** | 200 mV (typical at 200 mA) | | **Output Noise** | 11 μV rms (10 Hz to 100 kHz) | | **PSRR** | 88 dB (at 10 kHz), 50 dB (at 1 MHz) | | **Operating Temperature** | -40°C to +125°C | | **Package Type** | 8-Lead SOIC_N_EP (Exposed Pad) | --- ## 2. Key Electronic Features ### A. Low Noise and High PSRR The device is optimized for "clean" power. The high PSRR ensures that high-frequency noise from switching power supplies (DC-DC converters) is filtered out before reaching the load. This makes it ideal for powering ADCs, DACs, and precision amplifiers. ### B. Wide Input Voltage Range Unlike many LDOs that are limited to 5V or 6V, the ADP7118 can handle up to **20V**. This allows it to regulate down from standard 12V or 15V industrial rails directly. ### C. Precision Enable The device features a precision enable input. This allows the regulator to be turned on or off with specific logic levels, which is useful for sequencing power rails in complex systems. ### D. Stability with Small Capacitors The regulator is stable with small **2.2 μF ceramic output capacitors**, which saves PCB space and reduces costs compared to larger electrolytic or tantalum capacitors. --- ## 3. Part Number Breakdown Understanding the suffix codes for this specific part: | Code Segment | Meaning | | :--- | :--- | | **ADP7118** | Base Series Number | | **ARDZ** | Package: SOIC (R) with Exposed Pad (D), RoHS Compliant (Z) | | **2.5** | Fixed Output Voltage (2.5 Volts) | | **R7** | Packaging: 7-inch Reel (approx. 1,000 units) | --- ## 4. Typical Application Circuit A standard implementation requires only two external capacitors: ```text Input (2.7V - 20V) ----[ C_IN: 2.2uF ]----| VIN VOUT |----[ C_OUT: 2.2uF ]---- Output (2.5V) | EN | | GND | ``` ---