Features

Compatible with LM111 series equipment

Guaranteed maximum 0.5mv input offset voltage

Guarantee maximum 25NA input bias current

Guarantee guarantee Maximum 3NA input offset current

Guarantee maximum 250ns response time

Guarantee minimum 200000 voltage gain

50mA output current source or exchange

± 30V differential input Voltage

fully stipulated that for a single 5V operation

Application

SAR A/D converter

Voltage-frequency converter

Precision RC oscillator

Peak detector

Motor speed control

pulse generator

relay/light drive

Explanation

LT #174; 1011 is a general comparator, and its input characteristics are significantly better than LM111. Although the pin is compatible with LM111, it provides four times more than the lower bias current, six times the lower bias voltage and five times high voltage gain. The offset voltage drifting, a previously unspecified parameter, ensured 15 μV/° C. In addition, the power supply current reduces twice the coefficient of non -loss speed. The LT1011 is double the speed driving conditions faster than LM111. It is also completely specified as the parameter and response time of the DC single runtime 5V power supply. These parameters improvement allows LT1011 to be used for high precision (≥12) systems without trimming. For example, in a 12 -bit A/D application, when using 2MA DAC, LT1011 is less than 0.5LSB. LT1011 retains the multi -functional characteristics of all LM111, including a single 3V to ± 18V power operation, and the output of floating transistors has a 50mA source/exchange capacity. It can drive the load of grounding, negative power or positive power, and specify a voltage of up to 50V between V-and the setting electrode output. The differential input voltage of the Gundam full power supply voltage is allowed, and even if there is a ± 18V power supply, the input is clamped on the power supply with a simple diode pliers.

Absolute maximum rated value (Note 1)

Power supply voltage (needle 8 to needle 4) 36 volts

output to negative electrode power supply (Pink 7 to needle 4)

LT1011ac, LT1011C 40 volt

LT1011AI, LT1011I 40 volt

LT1011AM, LT1011M (outdated) 50 volts

ground To the negative electrode power supply (Needle 1 to pin 4) 30 volts

Differential input voltage ± 36 volts

Voltage 5 ilcus at the voltage at the pins (pins 6 to pin 8)

Input voltage (Note 2) is equal to supply

output short -circuit duration for 10 seconds

Work temperature range (Note 3)

LT1011ac, LT1011C 0 ° C to 70 ° C [ 123]

LT1011AI, LT1011i – 40 ° C to 85 ° C

LT1011AM, LT1011M (outdated) -55 ° C to 125 ° C

Storage temperature range -65 ° C to 150 ° C

Lead temperature (welding, 10 seconds) 300 degrees Celsius

Electric characteristics

indicates the specifications suitable for the entire working temperature range, otherwise the specification is ta u003d 25 ° C. Unless V1 u003d 15V, V u003d 15V, V u003d 0 V.

indicates the guarantee parameters of all power supply voltage (including a single 5V power supply). See Note 5.

Electrical features

indicate the specification suitable for the entire working temperature range. Other wider specifications are TA u003d 25 ° C. Unless V1 u003d 15V, V u003d 15V, V u003d 0 V.

indicates the guarantee parameters of all power supply voltage (including a single 5V power supply). See Note 5.

Note 1: The absolute maximum rated value means that the life of the device may be affected.

Note 2: The input terminal can be clawed on the power supply with a diode so that the maximum input voltage can actually be put down by a diode voltage. See input protection in the application information section.

Note 3: TJMAX u003d 150 ° C.

Note 4: The output drops 1.5mA, vout u003d 0V.

Note 5: These specifications are suitable for a single 5V to ± 15V, the entire input voltage range, and high voltage and low voltage output status. The high state is IsinK ≥100 μA, VOUT ≥ (V+–1V) and low -state Isink ≤ 8MA, VOUT ≤ 0.8V. Therefore, the wrong band of the worst case of this specification, including the mode signal, voltage gain and output load.

Note 6: Drift is measured by maximum temperature difference and minimum temperature difference by dividing the deviation voltage difference.

Note 7: Use 100MV jump and 5mV to measure the response time speeding. The output load is a 500Ω resistor connected to 5V as the output voltage exceeding 1Measure when .4v.

Note 8: Do not shorten the frequency flash needle. It should be the shortest time to drive the shortest time under 3MA to 5mA. The current is as low as that of the speed, 500 μA will be selected LT1011A. When the external ""pass"" is selected outside, the leakage of more than 0.2 μA on the pink pins may cause offset voltage offset.

Note 9: See the chart ""Input offset voltage and common mode voltage""

Typical performance features

Application information

Prevent the oscillating problem

The oscillation problem in the comparator almost always exists from output, input or output and other sensitive sensitivity Comparison between pins. In the case of high gain, the bandwidth comparator design like LT1011 is designed for rapid switching for millivoltage signals. LT1011's gain bandwidth is greater than 10GHz. The oscillating problem often occurs at 1015mA in the LT1≈2000. This means that the attenuation of the output signal must be at least 2000: 1 when the 5MHz measured at the input terminal. If the source impedance is 1K , the effective bandard capacitance between the output and input must have a power resistance greater than (2000) (1K ) u003d 2m , or less than 0.02pf. The actual staggered capacitance between the input and output pins on the LT1011 is less than 0.002pf printing circuit. The additional mixture capacitors caused by the traces of the printing circuit must run directly from the input route to run the ground tracking from the input terminal directly from the input routing output tracking. Make sure that the oscillating operation includes:

1. Use 0.01μF to bypass the capacitor connected from No. 5 to the 5th foot with 0.01 μF. This eliminates the sensitivity from output to balanced sales, and its sensitivity is almost input.

2. Wet the negative electrode power supply (pin 4) ceramic capacitor with 0.1 μF to approach the comparator. If the 0.1 μF jar is connected to the separate power supply, it can also be used for the positive power supply (pin 8). When the load is pulled directly to the pin 8, use 2 μF solid 钽 bypass electric container.

3. Wet the capacitor to bypass any slow movement or DC input (≥0.01 μF) near the comparator to reduce the high frequency source impedance.

4. Keep the resistance source as low as possible. If you add a resistor to the input terminal to balance the source of the source for DC accuracy and use a capacitor. LT1011's low input bias current does not require any power supply. For example, 5K imbalances only cause 0.25mv DC offset.

5. Mastery use. This includes changing the output voltage of the comparator during the input output. StagnationThe comparator is forced to quickly move its linear area to eliminate the oscillating input conditions of the ""Drive"" comparator. Magnetic stagnation can be communication or DC. AC technology does not change the display offset voltage but requires the minimum input signal conversion rate. All DC stagnation work input conversion rates, but the offset voltage offset depends on the previous conditions of the input signal. The circuit shown in FIG. 1 is a very good circuit communication and the compromise between DC stagnation.

This circuit is particularly useful for general use comparison applications, because it does not force any signal to return to the input signal source directly. Instead, it uses balanced sales to provide a very fast, clean output switch, even if the low -frequency input signal is within the world. 0.003 μF capacitor pins 6 to pin 8 generate communication stagnation, because the voltage on the balance pipe foot moves slightly according to the output state. Both needles are moving 4 millivolves. If a pin (6) is bypass, the exchanges are created. The input and output are only a few push, but it is enough to reach the maximum speed that the comparator can reach. To prevent the input conversion value from too low, it also uses a small amount of DC magnetic stagnation. The sensitivity of this balanced sales of the current is about 0.5mV per Weian input reference balancing pin current. The 15 -meter resistor output to the pin 5 to generate 0.5mv DC lag. The combination of this communication and DC stasis creates a clean -free switch, and the input error is small. Figure 2 depicts the frequency of the relationship circuit of the input reference error and switching, as shown in the figure. Note that at low frequencies, errors are only DC electromagnetic stags, and at high frequency, an additional error is caused by AC stagnation. The high frequency error can be reduced by reducing CH, but the lower value may not be able to provide clean switching very low conversion input signals.

Input protection

The input of LT1011 is particularly suitable for the application of general destination comparators, because without damage to the comparator, it can tolerate larger differentials and/or co -mode voltage. One or two inputs can be higher than the negative power supply 40V and independent of the positive power supply. The supply will be executed when the input value is lower than the negative value. In this case, the input current must be limited to 1 millimeter. If a very large (fault) input voltage must be adjusted, the series resistors and clamp diode should be used (see Figure 3).

D1 to D4: 1N4148

If the result ≤1mA, it can be eliminated

Press

Fail current The power consumption

Application information

The input resistance should limit the fault current to the reasonable value (0.1ma to 20mA). The power consumption must consider the resistor for continuous failure, especially when the LT1011 power is turned off. The last note: The light load power supply can pass through the D1-D4 large fault current. R3 and R4 Limit the input current of LT1011 less than 1MA when the input signal is kept below V-. If R1 and R2 can be large enough to limit the failure, the fault current is less than 1mA.

Input conversion rate limit

The response time of the comparator is usually the measured step voltage of the measurement is 100mV and the overvoltage is 5mV to 10mV. Unfortunately, this does not simulate the situation of many real worlds. Under normal circumstances, Buquan is much larger and the speed can be greatly reduced. For LT1011, the step size is very important, because the conversion rate of internal nodes will limit the response time of the input steps greater than 1V. For example, under 5V steps, the response time from 150ns to 360ns. See more details of the ""response time and input"" curve. If the response time is critical and large input signal is recommended to install clamp diode on the input terminal. When the differential input voltage is low, the conversion rate limit will also affect performance, but both input must be transformed quickly. It is recommended that the maximum public multiple mode conversion rate is 10V/μs.

LT1011 can be frequently flashing from

. The output transistor is forced to close the state and provide ""Hi"" output at the collector (pin 7). The as low as 250 μA will lead to the selection, but the current current is 200NS to 300NS. The medium -frequency selection of the current has increased to 3mA, and the selection delay drops to 60 nan seconds. The voltage at the foot of the pipe tube is V+when the voltage of the pipeline is less than 150 millivolta, and it is lower than V+about 2 V. It lasts 3 mAh. Do not connect the flash needle. There must be current drive. Figure 4 shows a typical selection circuit. Note that there is no bypass power container 6 between the pin 5 and the speed of the selection of the passage, but for the slow and low oscillation problem, the comparative is more sensitive to the level input. The 1PF capacitor between the output end and the pin 5 will greatly reduce the fluctuation problem in frequent.

DC magnetic stagnation can also be output to the pin 5. See the step 5 under the ""prevent oscillation"". ""Sales (6) used for Chongye (6) is also one of the needles of the offset adjustment device. The current of inflow or flowing pin 6 must be kept very low ( lt; 0.2 μA) to prevent input offset voltage wheels. [123 123. ]

Output crystal tube

LT1011 output transistor is really floating without current flow or outflow of collectors or when the transistor is in a ""off"" state. This equivalent circuit is shown in Figure 5 in Figure 5 Show.

Application information

In the ""closure"" state, I1 is closed, Q1 and Q2 are turned off. The collector of the Q2 can be maintained now. Under any voltage V or no conductivity, including the voltage higher than the positive supply level./I is 40V emitting pole. Any voltage between V+and V -AS is as long as it is negative to the collector. In the ""ON"" state, I1 is connected to Q1 and Q2. The diode D1 and D2 prevent Q2 from increasing the speed, while limiting the driver current of Q1. This R1/R2 separator is set to set the saturation voltage of Q2 and provides a shutdown driver. The collector or launch pole pins can be kept in the voltage between V+and V-. This makes the remaining sales drive load. In a typical application, the transmitter is connected to the V+connected load or an independent positive electrode power supply connected to V+. When the transmitter is used as the output, the set electrode is usually connected to V+, load ground or V -. Note that the emission pole output and relative to the setting electrode output, so that the ""+"" and "" -"" input names must be reversed. When the collector is bundled, for V+, the voltage of the emission pole in the ""opening"" state is about 2V lower than V+(see the curve).

The input signal range

The co -mode input voltage range of the LT1011 is about 300mV above the negative power supply, which is below 1.5V positive supply, and is independent of the actual supply voltage (see typical performance characteristic curve). This is the output voltage range. When the co -modulus voltage is used to apply to an input, and a higher or lower signal to the remaining input. If an input is in the public area and one is outside, the output will be correct. If the input exceeds the opposite direction of the common modular range, the output is still correct. If both have inputs outside the same co -mode range, the output will not input the difference in input; for the temperature of 25 ° C and above, the output will be unconditionally kept high (the collector output). Temperature, output becomes unreasonable.