Features

gain bandwidth multiplication: 5MHz typical value

conversion rate: 3V/μs typical value

The low power supply of each amplifier: maximum 0.55 MA

Input offset voltage: maximum 180 μV

Input offset voltage drift: maximum 3 μV/° C

Input offset current: maximum 20NA

Enter bias current: maximum 100NA

Open loop gain: 1500V/MV min (vs ± 15v)

Low input noise voltage: 16.5NV/√Hz

Low low Input noise current: 0.14Pa/√Hz

Large output driver current: 20mA min

Single power operation

Input voltage range includes ground

output is down below Plasizes on the ground when the sinking current

Wide power supply voltage range: 2.5V to 36V

The specifications are 3.3V, 5V and ± 15V

dual -in -8 -pin PDIP and other components [ 123]

The four cores in the narrow 16 -stitch SO package

Application

battery power supply system

Portable instrument

A source filter [ 123]

Optical diode amplifier

DAC current voltage amplifier

Instructions

LT #174; 1492/

LT1493

is double/four, low Power consumption and single -level accuracy amplifier, with 5MHz gain bandwidth products, 3V/μS conversion rate, static power supply current is only 450 μA each amplifier. When the maximum input offset voltage is only 180 μV

LT1492 /LT1493, it eliminates fine -tuning in most systems, and at the same time, it provides uncommon high -frequency performance to power the single power amplifier. LT1492/LT1493 will be more than 2.5V and less than 36V in any more than the total voltage, and it is specified as a single 3.3V, a single 5V and ± 15V power supply. Even if they are quiet and low at the minimum output drive of 20mA, they are suitable for driving low impedance loads. The input can be driven to the output damage or phase reversal beyond the supply. Low -run voltage and wide input output range make the LT1492/LT1493 amplifier is an ideal choice for battery power applications. For a single power application amplifier that requires faster accuracy, see 14MHz, 7V/μS LT1211/LT121228MHz, 12V/μS LT1213/LT1214 or 23MHz, 50V/μSLT1215/LT1216. Absolutely maximum rated value

Total power supply voltage (V+to V-) 36 volts

Input current ± 15 mAh

Output short circuit duration ( Note 1) Continuous

Work temperature range –40 ° C to 85 ° C

Standard temperature range (Note 2) ... 40 ° C to 85 ° C

Concluding temperature 150 degrees Celsius

Storage temperature range -65 ° C to 150 ° C

Lead temperature (welding, 10 seconds) 300 degrees Celsius

5V electrical characteristics

Vs 5V, 0V; VCM 0.5V, VOUT 0.5V, TA 25OC, unless there is another instructions

± 15V electrical characteristics

vs ± 15V, VCM 0V, VOUT 0V, 0 ° C ≤ TA ≤ 70 ° C, unless there is another instructions.

indicates the standard temperature range suitable for the entire operation.

Note 1: A radiator may be needed to keep the temperature output output indefinitely shorter than the absolute maximum value.

Note 2: LT1492/LT1493 design, characteristics and expectations to meet the temperature limit of these extensions, but not at -40 ° C and 85 ° C. Provide guarantee I -level parts. Consult the factory.

Note 3: This parameter is not 100%test.

Note 4: It is guaranteed by the correlation with vs 3.3V and vs ± 15V test.

Note 5: On the output width of ± 10V, the measurement rotation rate between ± 5V is on the ± 15V power supply.

Note 6: Most LT1492/LT1493 electrical characteristics change very small with power supply voltage. For the characteristics of not listed, see Table 5V 3.3V.

Note 7: It is guaranteed by the correlation with vs 5V and vs ± 15V test.

Note 8: It is guaranteed through the correlation with vs 3.3V test.

典型性能特征

[123 ] Application information

Power voltage

All 1492/1493 lamps are adjusted by 2.1V power supply. The amplifier will continue to work 1.6V, although the input co -mode range and phase difference are about to disappear. The minimum operating power supply voltage is guaranteed by the PSRR test to ensure that the input co -mode is equal to 500MV and the minimum power supply voltage of A.2.5V. LT1492/LT1493's positive power supply feet should be in an inch needle. When driving a heavy vehicle, it should be used by 4.7 μF capacitors. When using a split power supply, it is also suitable for the negative power supply foot.

Power loss

LT1492/LT1493 combines high -speed and large output small packaging vehicles. Because the supply voltage range is large, it may exceed the temperature under the maximum value. The maximum knot temperature (TJ) is calculated according to the ambient temperature

Temperature (TA) and power consumption (PD) as follows:

LT1492CN8: tj TA+(PD 130 ° C/W)

LT1492CS8: TJ TA+(PD 190 ° C/W)

LT1493CS: TJ TA+(PD 150 ° C/W)

The worst case is the greatest power consumption

When the output voltage is

power supply voltage (or maximum swing, if it is less than

1/2 power supply voltage). For each amplifier, PDMAX is:

pdmax (V+--v -) (ISMAX)+(V+/2) 2/RL

Example: LT1493 at 70 ° C, vs VS, vs ± 15V, RL 1K

pdmax (30V) (930 μA)+(7.5V) 2/1k 84.2MW

TJ maximum value 70 ° C+(4 (4 #8226; 84.2mW) (150 ° C/W) 121 ° C

Input

Generally, at room temperature, the input/LT1493 Can of LT1492 -) The function within 1.2V of the positive power supply of the amplifier is normal. However, the input bias current is shown in the characteristic curve. In terms of complete and precise performance, between 1.5V below 1.5V below the positive power supply should be restricted. When Renyi input exceeds 700mV below the ground (V-), the input current will increase the dramatic land. The current is limited to the internal 100 restrictions on the resistance of each input pin and the diode. The output will remain low (non-phase reversal) input 1.3V underground (V-). If the output does not absorb current, if the input does not exceed 8V below the ground in a 1K single power system.

LT1492 has no card/LT1493 input, so each input can force the voltage between the power supply. Most of the time in this range, the input current will remain at a constant value of about 50NA. When the input is close to the positive power supply 1.5V, the input current will gradually decrease to zero, Until the input is higher than the power supply, and then due to the diode mentioned earlier. If the reverse input is kept 200mv or more than the irreversible input, and the irreversible input is in the 300 millivolta (V-), the power current will increase by 1mA, and the irreversible input current will be increased to about 10 μA. Remember that the comparator application of the reverse input maintenance is higher than the ground (V -) and the input of no switching or approaching the ground (v)

output

LT1492/LT1493 output output The positive power supply of 0.65V will be carried out in the range of 3MV. See the typical performance curve voltage characteristics of the output saturation under the load conditions. The output of LT1492/LT1493 has a diode with reverse bias. If the output is forced to exceed the supply, unlimited current flows. If the current is temporary, it is limited to hundreds of milliamps, isn't it damaged?

Feedback component

Because the input current of LT1492/LT1493 is small, greater than 100NA, you can use high -value feedback to set the resistance of the gain. However, it must be noted that the electrode formed by the feedback resistor and input capacitance will not reduce the stability of the amplifier. For example, if a power supply, the use of two 62K resistors to set the non -ease gain to 2LT1492/LT1493 may oscillate. This is because the amplifier has a 50 ° phase habits at a 1MHz (6DB gain). The feedback resistance and 10PF input capacitance generate a magnetic pole at 500kHz at 500kHz. The solution is to simply reduce the resistance value or add feedback 10PF or larger capacitors.

Capacity load

LT1492/LT1493 Optimized supply operations for low -voltage and single power supply. The maximum capacity load VS load current typical performance curve shows the circuit performance of non -load resistance. When the output is a sinking current or a high power -driven load, the capacitance load processing capacity is reduced.

Comparison application

Sometimes it is desirable to use the computing amplifier as a tool. Operation LT1492/LT1493 or 5V power supply on a single 3.3V, the output is directly with most TTL interfaces and CMOS logic. The response time of LT1492/LT1493 is very strong input. These amplifiers are a stable computing amplifier and non -fast comparator of the unit gain. Therefore, the driver may oscillate due to the long transition time. The output can increase the function of the input direction of the input direction by increasing 20mv or more lag (positive feedback).