TLV1702AIDGKR

TLV1702AIDGKR

Part Number: TLV1702AIDGKR

Manufacturer: Texas Instruments

Description: Analog Comparators Dual 2.2V to 36V microPwr Comparator

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TLV1702AIDGKR Description

The TLV170x line of devices has rail-to-rail inputs, a low quiescent current, a small propagation latency, and a wide operating voltage range. Additionally, the propagation delay is quite short. These products are the most versatile comparators available on the market right now because they incorporate all of these functions within a packing format that is incredibly compact and conforms to industry requirements. Because the output can be dragged to any voltage rail thanks to the open collector output, regardless of the voltage chosen on the TLV170x supply, It is possible to direct the output to any rail up to +36 V higher than the negative power supply.

These devices are available with a channel count ranging from one (TLV1701) to four (TLV1704) (TLV1704). Because of its low input offset voltage, low input bias currents, low supply current, and open-collector architecture, the TLV170x series is versatile enough for various applications. These could be as straightforward as the detection of a single voltage or as complicated as the operation of many relays at the same time. All equipment is designed to work properly in temperatures ranging from -40 degrees Celsius to +125 degrees Celsius, which can be encountered in factories.

Detailed Description

Comparators belonging to the TLV170x series have an input and output designed to work with rail-to-rail signals and can function with supply voltages of up to 36 V. When rail-to-rail input stages are utilized, it is possible to detect signals that are situated extremely close to the supply and the ground.

Because of the device’s open collector configuration, it is ideal for wired-OR topologies, making it applicable to applications such as a window comparator. These comparators are perfect for a wide variety of applications due to their low supply current of roughly 55 A per channel and their tiny, space-saving packaging. These features make them appropriate for applications ranging from portable to industrial.

Feature Description

● Comparator Inputs

The TLV170x are comparators that use a common-mode input range that extends across the entire width of the supply rails, and they take inputs from both of the supply rails. These comparators may be found in the TLV170 series. Even in the case that the input pins reach voltages higher than the supply voltage, the TLV170x is designed to prevent phase inversion from occurring.

Application Information

Comparators with the model number TLV170x use a common-mode input range that spans the whole width of the supply rails and accepts inputs from both sides. This range can be found on all TLV170x. In addition, one can use this option along the length of the supply rail without any problems. The TLV170 series includes several different comparators, and this particular model is just one of them. Even if the input pins are subjected to voltages higher than the supply voltage, the TLV170x is designed to prevent phase inversion from occurring. This is the case regardless of whether or not the supply voltage is present.

● Typical Application

Comparators are utilized in the process of distinguishing between two distinct signal levels. For instance, a comparator can tell the difference between a situation where the temperature is above normal and one where the temperature is normal. Multiple transitions are caused, however, when there is noise or signal change at the threshold being compared. This application example establishes higher and lower hysteresis thresholds to remove the many transitions brought on by noise.

● Detailed Design Procedure

Modify the comparator circuit to include hysteresis by making a minor adjustment. The repeated transitions caused by the preceding circuit are avoided by hysteresis by utilizing two distinct threshold voltages. If the input signal is to transition low, it must be higher than the upper threshold (VH) and lower than the lower threshold (VL) if it is to transition high.

The hysteresis level is determined by the resistor Rh. Pullup resistors are necessary for output stages that use open collectors (Rp). When the output of the comparator is in the logic high state, the pullup resistor causes a voltage divider to be formed at that point, which results in an error being produced. If Rh is greater than 100Rp, the severity of this issue will be reduced. When the output is at a high logic level, 5 V, Rh is connected in parallel with Rx (ignoring Rp).

The threshold voltage (VH) is increased to 2.7 V due to this design, which also forces more current into Ry. The input signal must be driven higher than VH, which equals 2.7 V. (0 V) for the output to change from high to low. Rh is connected in parallel with Ry when the output is in the logic low position (0 V). This setup brings the threshold voltage down to 2.3 V and reduces the amount of current that flows through Ry. For the output to change from logic low to logic high, the input signal has to be driven lower than VL, which is 2.3 V. (5 V).

Power Supply Recommendations

The TLV170x is specified for operation from 2.2 V to 36 V (±1.1 to ±18 V); many specifications apply from –40°C to +125°C.

Layout Guidelines

Input noise can severely affect comparators. Follow these principles for the best layout results:

  • Choose a PCB with a low-inductance ground plane that is solid and not damaged. The TLV170x benefits from proper grounding (ground plane use) to keep operating as designed.
  • An effective method for reducing supply noise is to install a decoupling capacitor (0.1-F ceramic, surface-mount capacitor) as close to VS as practicable.
  • For the same reason, it’s best to minimize the length of the leads connecting the inputs and output of the comparator. Separate the inputs from the result.
  • Eliminate the need for a socket and solder the component directly to the PCB.
  • Pay close attention to avoiding parasitic feedback for input signals that move slowly. A tiny capacitor (1000 pF or less) can be connected between the inputs to reduce oscillations in the transition zone. When the impedance is low, the propagation delay suffers because of this capacitor. The ground plane should be connected between the output and inputs on the top side.
  • To isolate the inputs from the outputs, connect the ground pin ground trace from under the device to the bypass capacitor.

Conclusion

This Texas Instruments TLV1702AIDGKR comparator circuit allows you to quickly and easily compare two input signals in your circuit. The output is a free-flowing collector. It requires a minimum of 1.1 V and a maximum of 18 V, with the most common ranges being 3 V, 5 V, 9 V, 12 V, and 15 V. This comparator may be used in temperatures ranging from -40 degrees Celsius to 125 degrees Celsius. In normal conditions, the PSRR is 96.48 dB. A single or dual source can power this apparatus. Each chip can handle two channels.

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