## Overview of the ADCMP351 The **ADCMP351** is a low-power, logic-output comparator with an integrated 0.6 V voltage reference. It is designed by Analog Devices and is commonly used for threshold detection, power supply monitoring, and battery-powered applications due to its minimal current consumption. --- ### Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Supply Voltage Range** | 2.25 V to 5.5 V | | **Integrated Reference** | 0.6 V (Fixed) | | **Quiescent Current** | 7 µA (Typical) | | **Output Type** | CMOS Push-Pull | | **Propagation Delay** | 5 µs (Typical) | | **Operating Temperature** | −40°C to +125°C | | **Package** | 4-lead SC70 | --- ### Core Electronic Characteristics #### 1. Integrated 0.6 V Reference The most significant feature of the ADCMP351 is its internal precision reference connected to the inverting input. This allows the device to act as a precision threshold detector without requiring an external voltage divider for the reference side. #### 2. Push-Pull Output Unlike open-drain comparators that require a pull-up resistor to function, the ADCMP351 features a **CMOS push-pull output stage**. This means: * It can source and sink current. * The output swings Rail-to-Rail (from GND to $V_{CC}$). * It reduces component count and PCB space. #### 3. Low Power Consumption Drawing only **7 µA**, it is ideal for "always-on" monitoring circuits in portable electronics where battery life is critical. --- ### Pin Configuration (SC70 Package) | Pin No. | Mnemonic | Description | | :--- | :--- | :--- | | 1 | **$V_{IN}$** | Non-inverting input of the comparator. | | 2 | **GND** | Ground reference. | | 3 | **OUT** | Logic output (High when $V_{IN} > 0.6V$). | | 4 | **$V_{CC}$** | Supply voltage input. | --- ### Typical Application Circuit To monitor a voltage higher than 0.6 V (e.g., a 3.3 V rail), a simple resistive divider is used at the $V_{IN}$ pin. ```text V_MONITOR ----[R1]----o----[R2]---- GND | [VIN Pin] ``` **Calculation Formula:** The output will trigger (go High) when: $$V_{MONITOR} \times \frac{R2}{R1+R2} > 0.6V$$ ---