TLV3702CDGKR

The TLV3702CDGKR (hereinafter also referred to as the TLV3702) is a high specification linear-comparator, specifically suited to low level detection applications. It belongs to the Linear-Comparator family, since it uses differential input and linear output characteristics to measure signals relative to a reference level. This article explains the application fields, features and principle of operation of the TLV3702.

Application Fields

The TLV3702 is designed to work in low-voltage applications and is ideal for many environments that require small form factor and low power consumption. Owing to its high accuracy, very low power consumption and small physical size, the TLV3702 suits applications such as industrial automation, automotive, and many other portable and mobile devices. Its comparatively low input voltages and wide range of supply voltages give it an added versatility for different types of applications.

It is designed for precision voltage comparison, the type of comparison often used in low-voltage applications; the comparison might involve multiple signals, starting from TTL logical level to Vcc voltage level. It is well suited for logic-level sensing, Vcc sensing, and thermal shutoff applications.

Features

The TLV3702 can operate on a wide range of supply voltage and its comparative features make the device stand out among its peers:

• Very low power consumption.
• Wide supply voltage range (1.8 to 6.0V)
• Low input bias current.
• Clamped input voltage range makes its easy to protect the i/p from ESD and/or transients.
• Wide operating range.
• High speed of response.
• Very high accuracy (2% error range).
• Very low offset voltage and offset current.

Principle of Operation

The TLV3702 is a dual comparator with each input having two differential voltage inputs and a reference voltage input. Two outputs are provided: one for each comparator. The output will switch low when the voltage on either of the input terminals exceed that of the reference voltage. The comparator is a modified Schmitt trigger configuration (Fig 1) and offers very high input impedance, low input bias current, and low offset current.

In operation, the TLV3702 has two input terminals (COM1 and COM2) and a reference voltage terminal (REF). In a simplified manner, the TLV3702 can be thought of as a differential amplifier, with one input being maintain at a constant voltage (that of the reference voltage) and the second input signal (COM1 or COM2) being fed-in to the signal port. If the signal port voltage exceeds the reference voltage, the input signal will cause a change in the output voltage (at the reference voltage) and the comparator will switch.

The TLV3702 also features a clock enable function, which enables the device to detect only data that is valid at the clock period. So, if the signal to be monitored changes outside of the clock period, the device won\'t switch state. This is an added safety feature and helps to extend the life of the device. Additionally, the device has hysteresis to give a sharper switching waveform and to reduce noise spikes.

Conclusion

The TLV3702 is a very versatile and reliable device, suitable for a wide range of low voltage precision detection, comparison and sensing applications. With its wide supply voltage range, low power consumption and accuracy of 2%, it is an excellent choice for many situations where size, cost and power are key considerations.