Overview
The LMV7239M7X-TI, produced by Texas Instruments, is an ultra low power, low voltage comparator designed for high-speed applications. This device operates over a full supply voltage range of 2.7 V to 5.5 V and features a propagation delay of 75 ns while consuming only 65 µA of supply current at 5 V. The LMV7239 is ideal for systems requiring low power and small size, making it suitable for portable and battery-powered systems, set top boxes, and high-speed differential line receivers.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage Range | 2.7 | 5.5 | V | |
| Propagation Delay | 75 | 96 | ns | |
| Supply Current | 52 | 65 | 100 | µA |
| Input Offset Voltage | -6 | ±0.8 | +6 | mV |
| Input Bias Current | 30 | 400 | 600 | nA |
| Common-Mode Rejection Ratio | 52 | 62 | 67 | dB |
| Power Supply Rejection Ratio | 65 | 85 | dB | |
| Input Common-Mode Voltage Range | V- - 0.2 | V+ + 0.2 | V | |
| Output Swing High (LMV7239 only) | V+ - 0.35 | V+ - 0.26 | V+ - 0.02 | V |
| Output Short Circuit Current (LMV7239 only) | 15 | 55 | mA |
Key Features
- Rail-to-Rail Input and Output: The LMV7239 has a greater than rail-to-rail common-mode voltage range, extending 200 mV below ground and 200 mV above supply voltage.
- Low Power Consumption: The device consumes only 65 µA of supply current at 5 V.
- High-Speed Operation: Features a propagation delay of 75 ns.
- Push-Pull Output Stage: The LMV7239 has a push-pull output stage, eliminating the need for an external pull-up resistor.
- Space-Saving Packages: Available in 5-pin SOT-23 and 5-pin SC70 packages.
- Internal Circuitry: The LMV7239's internal circuitry includes a complimentary PNP and NPN input stage for sensing common-mode voltage near V- and V+.
Applications
- Portable and Battery-Powered Systems: Ideal for devices that require low power consumption.
- Set Top Boxes: Suitable for high-speed signal processing in consumer electronics.
- High-Speed Differential Line Receivers: Used in applications requiring fast and accurate signal detection.
- Window Comparators: Useful in applications that need to detect signals within a specific voltage range.
- Zero-Crossing Detectors: Can be used to detect the zero-crossing point of AC signals.
- High-Speed Sampling Circuits: Suitable for high-speed data acquisition systems.
Q & A
- What is the supply voltage range of the LMV7239?
The LMV7239 operates over a supply voltage range of 2.7 V to 5.5 V.
- What is the propagation delay of the LMV7239?
The propagation delay of the LMV7239 is 75 ns.
- How much supply current does the LMV7239 consume at 5 V?
The LMV7239 consumes 65 µA of supply current at 5 V.
- What type of output stage does the LMV7239 have?
The LMV7239 has a push-pull output stage.
- What are the available packages for the LMV7239?
The LMV7239 is available in 5-pin SOT-23 and 5-pin SC70 packages.
- What is the common-mode voltage range of the LMV7239?
The input common-mode voltage range extends 200 mV below ground and 200 mV above supply voltage.
- How does the LMV7239 handle noise in the input signal?
The high gain of the LMV7239 eliminates oscillation issues when the differential input is near zero. However, hysteresis can be added to improve propagation delay with low overdrive.
- What are some typical applications of the LMV7239?
Typical applications include portable and battery-powered systems, set top boxes, high-speed differential line receivers, window comparators, and zero-crossing detectors.
- Can the LMV7239 be used in high-speed sampling circuits?
Yes, the LMV7239 is suitable for high-speed sampling circuits due to its fast propagation delay and low power consumption.
- How does the output stage of the LMV7239 differ from the LMV7235?
The LMV7239 has a push-pull output stage, whereas the LMV7235 has an open drain output that requires an external pull-up resistor.
