## Overview of the CMP04FP The **CMP04FP** is a low-power, high-precision **quad voltage comparator** manufactured by Analog Devices. It is designed to operate from a single power supply and is widely used in applications where low power consumption and high accuracy are critical. --- ### Key Specifications and Features | Parameter | Specification | |:---|:---| | **Number of Comparators** | 4 (Quad) | | **Supply Voltage (Single)** | +3.3V to +36V | | **Supply Voltage (Dual)** | ±1.65V to ±18V | | **Supply Current** | 2 mA (Max for all 4 comparators) | | **Input Offset Voltage** | 1 mV (Max) | | **Response Time** | 1.3 μs | | **Output Type** | Open Collector (Requires pull-up resistor) | | **Package Type** | 14-pin PDIP (Plastic Dual In-line Package) | --- ### Functional Internal Parts The CMP04FP consists of four independent voltage comparators housed in a single package. Below are the core internal characteristics: 1. **Input Stage**: Features high-gain differential inputs. It has a very low input offset voltage, which ensures that the device can distinguish between very small differences in input signals. 2. **Gain Stage**: Provides the necessary amplification to convert a small input differential into a logic-level swing. 3. **Output Stage (Open Collector)**: The outputs are NPN transistors with open collectors. * **Benefit**: This allows the output to be "OR-ed" with other outputs. * **Requirement**: You must use an external **pull-up resistor** to define the "High" logic level voltage, which can be different from the V+ supply of the comparator itself. --- ### Pin Configuration (14-Pin PDIP) The pinout follows the industry standard for quad comparators: | Pin Number | Function | Description | |:---:|:---|:---| | 1 | **OUT 2** | Output of comparator 2 | | 2 | **OUT 1** | Output of comparator 1 | | 3 | **V+** | Positive Power Supply | | 4 | **IN- 1** | Inverting input of comparator 1 | | 5 | **IN+ 1** | Non-inverting input of comparator 1 | | 6 | **IN- 2** | Inverting input of comparator 2 | | 7 | **IN+ 2** | Non-inverting input of comparator 2 | | 8 | **IN- 3** | Inverting input of comparator 3 | | 9 | **IN+ 3** | Non-inverting input of comparator 3 | | 10 | **IN- 4** | Inverting input of comparator 4 | | 11 | **IN+ 4** | Non-inverting input of comparator 4 | | 12 | **GND / V-** | Ground or Negative Supply | | 13 | **OUT 4** | Output of comparator 4 | | 14 | **OUT 3** | Output of comparator 3 | --- ### Common Applications * **Battery Monitors**: Due to low power consumption. * **Threshold Detectors**: Comparing a sensor voltage against a reference. * **Zero-Crossing Detectors**: Identifying when an AC signal crosses 0V. * **Oscillators**: Used in square wave generation circuits. * **Window Comparators**: Checking if a signal stays within a specific voltage range. ---