Onsemi NCV2903DR2G Dual Differential Comparator: Datasheet, Pinout, and Application Circuits
The onsemi NCV2903DR2G is a versatile and robust dual differential comparator designed for a wide range of automotive and industrial applications. This device integrates two independent precision comparators on a single monolithic chip, offering excellent performance for voltage monitoring, signal conditioning, and switching tasks in electrically noisy environments.
A primary strength of the NCV2903DR2G lies in its wide single-supply voltage range, from 2V to 36V, or a dual supply of ±1V to ±18V. This flexibility makes it suitable for both low-voltage microcontroller interfaces and higher voltage industrial systems. Furthermore, it features an extremely low supply current drain (0.4 mA per comparator typical), which is virtually independent of the supply voltage, making it ideal for battery-powered applications. Its common-mode input voltage range includes ground, allowing it to sense signals near the negative rail, a critical feature for single-supply operations.
Key Datasheet Specifications:
Supply Voltage Range: 2V to 36V (±1V to ±18V)
Low Supply Current: 0.4 mA per comparator (typical)
Input Offset Voltage: 2.0 mV (maximum)
Input Common-Mode Voltage Range: -0.3V to Vcc + 0.3V
Response Time: 1.3 μs (typical)
Output Type: Open-collector (allows for wired-OR connections and easy interface with various logic levels)
Operating Temperature Range: -40°C to +125°C (qualified for automotive applications)
Pinout Configuration (SOIC-8 Package):
The pinout for the 8-pin SOIC package is as follows:
1. Output 1: Output of Comparator 1
2. Inverting Input 1: Inverting Input of Comparator 1
3. Non-Inverting Input 1: Non-Inverting Input of Comparator 1
4. Vcc-: Ground
5. Non-Inverting Input 2: Non-Inverting Input of Comparator 2
6. Inverting Input 2: Inverting Input of Comparator 2
7. Output 2: Output of Comparator 2
8. Vcc+: Positive Supply Voltage
Application Circuits:
The open-collector output and wide supply range of the NCV2903DR2G enable its use in countless circuits.
1. Basic Voltage Comparator: The most straightforward application is comparing a sensor signal against a fixed reference voltage. The output switches from a high-impedance state (pulled high by an external resistor) to ground when the input signal crosses the threshold set at the other input.
2. Wired-OR Window Comparator: Two comparators can be configured to create a window comparator circuit. This circuit monitors whether an input voltage lies within a specific "window" defined by two reference voltages (a high and a low limit). The output provides a distinct logic state if the signal drifts outside this predefined window, perfect for under/over-voltage monitoring in power supplies.
3. Zero-Crossing Detector: By grounding one input and applying an AC signal to the other (through a current-limiting resistor), the comparator's output will toggle every time the AC waveform crosses zero volts. This is fundamental for timing circuits in dimmers and motor control systems.
4. Simple Analog-to-Digital Converter (ADC): Multiple comparators can be used in parallel with a resistor ladder network to create a flash ADC, providing a very high-speed conversion for a limited number of bits.
ICGOODFIND: The onsemi NCV2903DR2G stands out as an exceptionally reliable and flexible dual comparator. Its wide voltage range, low power consumption, and rugged design tailored for the automotive industry make it a superior choice for engineers designing systems that must perform reliably under harsh conditions. Whether for basic threshold detection or complex monitoring systems, this comparator delivers robust performance and design simplicity.
Keywords: Differential Comparator, Open-Collector Output, Wide Supply Voltage, Automotive Grade, Low Power Consumption.
