## ADCMP396 Overview The **ADCMP396** is a quad-channel, rail-to-rail input, low-power comparator manufactured by Analog Devices. It is designed specifically for general-purpose monitoring and voltage detection in battery-powered systems. ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Channels** | Quad (4 Independent Comparators) | | **Supply Voltage Range** | 2.3 V to 5.5 V | | **Current Consumption** | ~18.6 µA (typical) | | **Output Type** | Open-Drain | | **Input Range** | Rail-to-Rail | | **Propagation Delay** | 4.2 µs (typical) | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Functional Characteristics * **Ultra-Low Power:** Its low current draw (less than 20 µA for all four channels) makes it ideal for IoT devices and portable electronics where battery longevity is critical. * **Open-Drain Output:** The output requires an external pull-up resistor. This allows for "wired-AND" logic configurations and enables level shifting (e.g., the comparator runs at 3V but interfaces with a 5V microcontroller). * **Rail-to-Rail Inputs:** The input common-mode range spans the entire supply voltage, meaning it can accurately compare signals even if they are at the ground or the positive supply rail. * **Internal Protection:** It features internal glitch immunity and high ESD protection (up to 4 kV HBM). --- ### 3. Pin Configuration & Internal Logic The ADCMP396 is typically available in a 14-lead TSSOP package. ```text ADCMP396 (Top View) +-------U-------+ OUT1 | 1 14 | OUT4 OUT2 | 2 13 | OUT3 VCC | 3 12 | GND IN1- | 4 11 | IN4+ IN1+ | 5 10 | IN4- IN2- | 6 9 | IN3+ IN2+ | 7 8 | IN3- +---------------+ ``` --- ### 4. Typical Applications * **Battery Management Systems (BMS):** Monitoring individual cell voltages for over-voltage or under-voltage conditions. * **Threshold Detectors:** Converting analog sensor data into digital "High/Low" signals. * **Window Comparators:** By combining two channels, you can detect if a voltage is within a specific range. * **Oscillators:** Creating simple clock or PWM signals using external RC networks. --- ### 5. Implementation Example (Basic Comparator) To use the ADCMP396 to detect if a voltage $V_{in}$ exceeds 2.5V: ```python # Conceptual Logic: # Connect IN+ to your signal (Vin) # Connect IN- to a 2.5V reference voltage # Add a 10k Ohm Pull-up resistor from OUT to VCC if (IN+) > (IN-): Output = High-Z (Pulled High by resistor) else: Output = Low (GND) ```