LMC6762 is an ultra -low -power dual comparator with a maximum power supply current of 10 Weian/comparator. It is designed in 2.7V to 15V. LMC6762 ensures that the specifications of 2.7V meet the needs of 3V digital systems. LMC6762 has two supply input -co -mode voltage range. This is a significant advantage in low -pressure applications. LMC6762 also has a push -pull output, allowing direct connection to logic devices without the need to pull the resistor. The static power consumption of 50μW/amplifier (@v+ 5V) makes LMC6762 very suitable for portable telephones and handheld electronic devices. Ultra -low power current has nothing to do with power supply voltage. Ensure that the operation and rail performance of the rails at 2.7V voltage make the device an ideal choice for battery power supply applications. For Mingqu version, see the LMC6772 data table about this device.

Features

(Unless otherwise explained, it is typical)

Low power consumption (maximum value): equal to 10 micro -safety/compressor

Wide range of power supply voltage: 2.7V to 15V

Rail -to -rail input covarurative voltage range

Rail output motion (within 100 MV range of the power supply,@v+ 2.7 volts,@v+ 2.7 volt, Iload 2.5 mia)

Short -circuit protection: 40 mAh

Display delay (@v+ 5V, 100 MV overspeed gear): 4 microseconds

Application

Application

]

Notebook computer

Mobile phone

Measurement system

Handheld electronic device

RC timer

Alarm and monitoring Circuit

window comparator, multi -vibrator

Absolutely maximum rated value (Note 1)

ESD tolerance (Note 2) 2KV

Differential input voltage (V+)+0.3V to (V-)-0.3 volts

Input/output pin voltage (V+)+0.3V to (V-)-0.3 volts

Power supply Voltage (V+-)-) 16 il

Input pin current ± 5 mAh

output pin current

(Note 7, 3) ± 30 mAh [ 123]

The current at the foot of the power supply pipe, LMC6762 40 mAh

Lead temperature

(welding, 10 seconds) 260 degrees Celsius

The storage temperature range is -65 ℃ ～+150 ℃

Jacking temperature (Note 4) 150 ℉

working rated value (Note 1)

Power supply voltage 2.7 ≤VS ≤ 15V

Concluding temperature range

LMC6762ai, LMC6762bi 40 ° C ≤TJ ≤+85 ° C

Thermal resistance (θja)

n components , 8 -pin molding 100 ℉ C/W

M components, 82 ℉ C/W

2.7V electrical characteristics of 82 ℉ ，

Guarantee all limits of TJ 25 ℃, V+ 2.7V, V- 0V, VCM V+/2. Black body restrictions are suitable for extreme temperatures.

AC electrical characteristics

Unless there are other regulations, it is guaranteed to guarantee TJ 25 ° C, V+ 5V, V- 0V, VCM VO V All limits+/2. Black body restrictions are suitable for extreme temperatures.

Note 1: Absolute maximum rated value indicates the limit that the device may be damaged. When the working rated value indicates that the device is in the state, the device tends to work normally, but it cannot guarantee specific performance. For guarantee specifications and test conditions, see electrical characteristics.

Note 2: Human model, 1.5 kΩ connects 100 PF.

Note 3: Applicable to the operation of single power and division. Under the condition of rising ambient temperature, continuous short -circuit operations may lead to more than 150 ° C by a maximum allowed. Long -term output current exceeding ± 30 mA can adversely affect reliability.

Note 4: The maximum power consumption is the functions of TJ (MAX), θJa, and TA. The maximum allowable power consumption at any ambient temperature is pd (TJ (MAX) – TA)/θ. All numbers are suitable for packaging directly welded to PC boards.

Note 5: Typical values represent the most likely parameter model.

Note 6: All limits are guaranteed by testing or statistical analysis.

Note 7: When V+greater than 12V, do not shorten the output to V+, otherwise reliability will be adversely affected.

Note 8: The average drift of the input offset voltage is calculated by removing the average drift of the accelerated operation life at an equivalent operation time. The input offset voltage average drift indicates the input offset voltage change under the worst input conditions.

Note 9: CL includes probes and fixture capacitors.

Note 10: Input the step -long measurement at 2V in the rise and fall. The delay of communication is also measured by 2V input.

Typical performance characteristics v+ 5V, single power supply, TA 25 ° C, unless there are other regulations

Program prompt

1.0Input co -mode voltage range

When the power supply voltage is 2.7V, 5V, and 15V, the LMC6762 has an input co -mode voltage range of more than two SUP PLIES. Like the case of the computing amplifier, the CMVR is used by the comparator in the co -mode of the device. 75 decibels (typical values) of co -model suppression ratio (sVOS/∏VCM) means the co -mode range of the entire device. The input voltage at the absolute maximum value V+ 5V exceeds any power rail 200 MV at room temperature.

The wide input voltage range means that the comparator can be used to sensing signals and power supplies near the ground. This is a very useful function to provide a monitoring circuit. The input voltage range exceeds SUP PLIES, 20 FA input current (typical values), and high input impedance to make LMC6762 an ideal choice for sensor applications. This LMC6762 can directly interface with the sensor without using an amplifier or bias circuit. In the circuit with a sensor, the output voltage from dozens of millival to hundreds of millival LMC6762 can compare the sensor signal with the appropriate small reference voltage. This reference voltage can be close to the ground or the positive electrode power rail.

2.0 low voltage operation

The comparator is a common device for analog signal and digital circuit interface. LMC6762 has been designed to run under 2.7V power supply, without SAC's disconnection performance to meet the requirements of 3V digital systems. When the power supply voltage is 2.7V, the co -mode voltage range is extended by 200 millivolves (guarantee) lower than the negative power supply. In addition to the inductive signal that can be closer to the right track, it is very useful for voltage applications when low -orbit.

When V+ 2.7V, the transmission delay was TPLH 4 μs and TPHL 4 microseconds, and the overspeed gear was 100 millivol to. Please refer to the performance curve to learn more about the more extensive characteristics.

3.0 penetrating current

The penetrating current is defined as a current surge, which is higher than the static power supply current and the negative power supply of the equipment. When the current is switched to the state of the equipment. At this moment, the switching current causes the power supply voltage to fail. Generally, the fault in the power supply line is compensated by the power container. When the switching current is the minimum, the value of the bypass container can be reduced considerable.

From Figure 3 and Figure 4, it can be seen that LMC6762 may be approximately 0.2 mAh (200 millival/1 kΩ). The transient duration measurement is 1 microsecond. The value required by the local bypass container can be calculated as follows:

If the local bypass capacitor must provide 100PC to prevent the minimum value of the local capacitor, the local degradation of VCC can be calculated. Assume that the maximum voltage that the system can withstand is 100 millivolves,

Δq C*(ΔV) → C (0.q/0.V) 100/100 millival 0.001 Fahrenheit

Therefore, LMC6762 low internal feed The current requires the lower value of the local bypass container. This is an important advantage in the application with unimportant accuracy, because the lower capacitance value can save the area and cost of accommodation. It is worth noting here that the voltage generated by the triangle transformation of the power supply will cause the threshold offset comparator. This threshold offset reduces the PSRR of the comparator. However, the PSRR value applies in this case is a transient PSRR, not a DC PSRR. Instant PSRR is significantly lower than DC PSRR. Generally speaking, reducing the power supply voltage is equal to or less than the lagging value comparator. For example, if the comparator has 50 MV stagnation, increase local bypass capacitors to 0.01 μF to reduce the voltage increase to 10 MV

4.0 output short circuit current

LMC6762 has a short circuit of 40 mAh. Protect. However, its design cannot withstand continuous short circuit, transient voltage or current peak, or short circuit to any voltage. The connection between the resistor and the output terminal should reduce the impact of shorts. Signals that send additional protection devices from the PC board, such as diode and barrier on the power rail.

5.0 lag

If the input signal is very noisy, the comparator output may go through the threshold several times when the input signal is repeatedly passed. This problem can be used as shown below.

The speed of the capacitor switch increased by the feedback resistance and provides more short -term lags. This can improve the noise resistance of the circuit.

6.0 SPICE macro model

SPICE macro model can be used for LMC6762. This model includes:

Input co -mode voltage range

Static and dynamic power supply current

Input speeding characteristics

and more listed in the macro model listed Featured disk. Contact the national semiconductor customers to reply to the SPICE model library disk with 1-800-272-9959 as the center.

Typical application (continued)

A single stable and multi -resonant has a stable state that can be retained indefinitely. It can trigger from the outside to another quasi -stability state. Therefore, a single -stable multi -resonant oscillator can be used to generate the pulse required. Set the required pulse width and R4 by adjusting the value of the C2. The resistance division of R1 and R2 can be used to determine the size of the input trigger pulse. When this is V1 LT; V2, LMC6762 will change. DBP D2 Pro provides a fast way to the capacitor C2, For the end of the pulse. The diode can also prevent input from underground drivers.

There are two stable states in the dual -stable multi -resonant. The reference voltage is set up by the sideline of R2 and R3. The pulse application to the setting terminal will switch the high output of the COM separator. The resistance division of the R1, R4 and R5 is unavailable to the reference voltage than the reference voltage. The pulse applied to the reset will now switch the output low.

R4 and R5 sidelines to establish reference voltage V1 at the non -inverted input terminal. By making the series resistance of R1 and R2 equal to R5, the comparator will switch when the vehicle recognition number 0. The diode D1 ensures that V3 is not lower than -0.7V. The signs of R2 and R3 stop V2 from starting from the ground. A small amount of lag is setting to ensure the fast output voltage conversion.

FIG. 9 shows the application waveform generator circuit of LMC6762 in the square. Set the total lag of the circuit through R1, R2 and R3. R4 and R5 charges the distribution path of capacitor C separately. Set up the ranges through R4 and D1. Therefore, the pulse width T1 is constant from R4 and C's RC time constant. Similarly, the path of the electric container is set by R5 and D2. Therefore, time T2 can be changed between the pulse by changing the R5, and the pulse width can be changed through R4. The output frequency can be changed by changing R4 and R5.

The circuit shown above provides the output signal from the time alignment from the scheduled time interval, and automatically reset the output when the input is returned to the ground. Consider the situation where the vehicle identification number is 0. The output of the comparator 4 is also on the ground. This means that the output of the comparator 1 and 2 is also on the ground. When the input signal is applied, the output of the comparator 4 is very high, and the charge of C increases through the index through R, as shown in the figure above. The output voltage of the comparator 1, 2, and 3 is switched to the high state when the VC1 is elevated to the reference voltage VA, VB, and VC. Provide a small number of lags to ensure fast switching and delay for a long time when choosing RC time constant.