**ADP7183ACPZN-R7: A Comprehensive Technical Overview of the -5V, 500 mA Ultralow Noise Linear Regulator**

In the realm of precision analog and RF systems, power supply integrity is paramount. Noise, ripple, and power supply rejection ratio (PSRR) are critical parameters that can make or degrade system performance. The **ADP7183ACPZN-R7** from Analog Devices stands as a premier solution for applications demanding clean, stable, and negative voltage rails. This article provides a detailed technical examination of this high-performance, ultralow-noise linear regulator.

The ADP7183 is a negative-voltage, low-dropout (LDO) linear regulator designed to deliver a fixed **-5V output from an input voltage range of -2.5 V to -6.5 V**. Its capability to supply up to **500 mA of continuous output current** makes it suitable for powering a wide array of sensitive components, including high-speed analog-to-digital converters (ADCs), digital-to-analog converters (DACs), RF transceivers, and precision op-amps.

The defining characteristic of the ADP7183 is its exceptional noise performance. It achieves an **ultralow output noise of just 1.8 μV√Hz at 10 kHz** and **3.3 μV√Hz at 100 Hz**. This remarkably low noise floor is crucial for minimizing phase noise in oscillators and clocking circuits and for preserving the dynamic range and signal-to-noise ratio (SNR) in data acquisition systems. This performance is maintained without requiring a separate noise-reduction bypass capacitor, simplifying the bill of materials (BOM).

Another standout feature is its outstanding **power supply rejection ratio (PSRR)**. The regulator boasts a PSRR of **70 dB at 10 kHz** and **50 dB at 100 kHz**, effectively attenuating ripple and noise originating from the preceding switching regulator or power source. This high PSRR ensures that the critical load is isolated from power supply disturbances, a vital requirement in mixed-signal environments.

The device offers a low dropout voltage of **190 mV at 500 mA load**, enhancing its efficiency and allowing it to operate effectively even as the input voltage approaches the output level. The initial output voltage accuracy is guaranteed to be within ±1.5%, ensuring precision from the start. Furthermore, the ADP7183 incorporates essential protection features such as **current limiting and thermal shutdown**, safeguarding both the regulator and the load under fault conditions.

Housed in a compact, space-saving **2 mm × 2 mm 8-lead LFCSP package**, the ADP7183ACPZN-R7 is engineered for high-density PCB designs. Its robust performance, combined with its small footprint, makes it an ideal choice for a diverse range of applications, including medical imaging equipment, test and measurement instruments, industrial automation systems, and telecommunications infrastructure.

**ICGOOODFIND:** The ADP7183ACPZN-R7 distinguishes itself as a top-tier negative voltage LDO regulator by delivering a potent combination of **ultralow noise, excellent PSRR, and a 500 mA output current** in a miniature package. It is an indispensable component for engineers tasked with designing high-performance systems where power quality is non-negotiable.

**Keywords: Ultralow Noise, Negative Voltage LDO, High PSRR, 500 mA, RF/Analog Power**