The **ADP7158ARDZ-3.0-R7** is a high-performance, ultra-low noise, high Power Supply Rejection Ratio (PSRR) linear regulator (LDO) manufactured by Analog Devices. It is specifically designed to provide clean power to noise-sensitive precision analog circuits. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical characteristics of the device: | Parameter | Specification | | :--- | :--- | | **Output Voltage** | Fixed 3.0V | | **Input Voltage Range** | 2.3V to 5.5V | | **Maximum Output Current** | 2.0 A | | **RMS Noise (10 Hz to 100 kHz)** | 0.9 µV rms | | **PSRR (at 100 kHz)** | > 60 dB | | **Dropout Voltage (at 2A)** | 120 mV (Typical) | | **Package Type** | 8-Lead SOIC_N_EP (Exposed Pad) | --- ### 2. Core Features & Functional Blocks The internal architecture of the ADP7158 is engineered to suppress noise from the input supply while maintaining a very low internal noise floor. * **Ultra-Low Noise Architecture:** It utilizes a proprietary architecture that keeps the output noise independent of the output voltage. * **High Current Capability:** Unlike many low-noise LDOs that are limited to 500mA, this part supports up to **2 Amperes**, making it suitable for powering high-speed ADCs or RF power amplifiers. * **Precision Enable:** Allows the device to be turned on/off with logic-level signals, useful for power sequencing. * **Thermal Management:** The "ARDZ" suffix indicates an 8-lead SOIC package with an **Exposed Pad (EP)**. This metal pad must be soldered to the PCB ground plane to dissipate heat generated by the 2A current load. --- ### 3. Pin Configuration The 8-lead SOIC package utilizes the following pinout: | Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | **VOUT** | Regulated Output Voltage (3.0V). | | 2 | **VOUT** | Regulated Output Voltage (Internal redundant connection). | | 3 | **VIN** | Input Supply Voltage. | | 4 | **VIN** | Input Supply Voltage. | | 5 | **EN** | Enable Input. Drive high to turn on the regulator. | | 6 | **REF** | Reference Filter. Connect a capacitor to reduce noise. | | 7 | **REF_S** | Reference Sense. Connect to the REF pin. | | 8 | **GND** | Ground. | | EP | **PAD** | Exposed Pad. Must be connected to GND for thermal relief. | --- ### 4. Typical Applications Because of its combination of high current and ultra-low noise, it is frequently found in: 1. **Communication Infrastructure:** Powering phase-locked loops (PLLs) and Voltage Controlled Oscillators (VCOs). 2. **Medical Imaging:** Precision ultrasound and MRI signal processing. 3. **Data Acquisition:** High-resolution 16-bit to 24-bit Analog-to-Digital Converters (ADCs).