Features

● Single power/dual power operation

-1.6V to 36V

- 0.8V to 18V

]

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The real single power operation; the input and output voltage range includes ground

● Low power current: maximum 80A

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High -output driver: 5mA minimum value

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Low offset voltage: maximum 0.5 ma

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High -open ring gain: 700 V/ mv min

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Excellence PSRR: 5.6 MV/V minimum value

● Industrial standards: ]●

以模具形式提供

一般说明

OP490是一款高性能微功率四路运算放大器，从1.6 V到36 V的单电源工作，或从- 0.8 V to the dual power of -18 V. The input voltage range includes negative, allowing OP490 to adjust the input signal downward in a single power operation. The output width of the OP490 also includes ground. When a single power supply runs, the ""zero -entry and zero"" operation can be achieved.

The static power supply current of each amplifier of the four -way OP490 is less than 20 mAh, but each amplifier can provide an output current of more than 5 mAh to the load. Within the military temperature range, the input offset voltage is lower than 0.5mV, and the offset drift is lower than 5mV/∞C. The gain exceeds 700,000, and the CMR is better than 100dB. The power suppression ratio below 5.6 MV/V can minimize the offset voltage in the battery power supply system.

The four -way OP490 combines the high performance of the four -way amplifier with the space saving and cost. The minimum voltage and current of the OP490 require it to become an ideal choice for battery and solar applications, such as portable instruments and remote sensors.

pin connection

Simplified schematic diagram

OP490 -Typical typical Performance features

Application information battery power supply application

OP490 can The minimum power supply voltage of 1.6V can also work under -0.8V's dual power supply, and only requires 60 mAh power current.In many battery power supply circuits, the OP490 can run continuously for hundreds of hours, and then the battery needs to be replaced, thereby reducing the time and operating costs of the device shutdown.

High -performance portable equipment and instruments often use lithium batteries, because compared with old original batteries, the shelter has a long shelf life, light weight, and high energy density. The nominal output voltage of most lithium batteries is 3V and is known for its flat discharge characteristics. OP490's low power supply current requirements, plus the flat discharge characteristics of lithium batteries, indicate that the OP490 can run within the entire service life of the battery. Figure 4 shows the typical discharge characteristics of the 1 AH lithium battery. The OP490 and each amplifier drive the output width to 100 kW in turn.

The output voltage range of the single power supply In the single power supply operation, the input and output range of OP490 include ground. This allows the real ""zero entry and zero"" operation. The output level provides active drop to about 0.8 volts from the ground. When this level is less than this level, the load resistance of up to 1 MW is required to lower the output to zero. In the area from the ground to 0.8 V, the voltage gain of OP490 is equal to the data table specifications. Keep the current source output capacity throughout the voltage range.

Input voltage protection

OP490 uses the PNP input level to protect the resistance with inverter and non -inverter input. The combination of high breakdown and protective resistance of PNP transistors provides a large number of input protection, allowing the input to exceed 20 V without damaging the amplifier without damaging the amplifier.

Micro -power voltage control oscillator

OP490 and cheap four -core CMOS switch combination to form a precision VCO in Figure 5. The circuit provides triangle and square wave output, and only 75 mAh is extracted from 5 volt power. A acts as the integral device; S1 switches the charging current symmetrically to generate positive and negative slopes. The integralor is B as the boundary, and B is used as a Schmidt trigger. The accurate lag is 1.67V. The output of A is a triangular wave, with the upper and lower levels of 3.33V and 1.67V, respectively. B's output is square wave, almost rail -to -track swinging. As shown in the figure, the operating frequency is given by the equal formula as follows:

But this is easy to change by changing C1. The circuit works well below Herz.

Micro -power consumption single power supply four -way voltage output 8 -bit DAC

The circuit in FIG The drain is only 140mA single -power four -voltage output DAC. DAC8408 is used for voltage switch mode, each DAC has an output resistance( #8482; 10 kw) Independent in the digital input code. The output amplifier acts as a buffer to avoid loading DAC. 100 KW resistors ensure that the OP490 output is lower than 0.8 V.

High-output amplifier

The amplifier shown in FIG. 7 can drive 25V P-P to 1kW load. The design of the amplifier is based on the bridge structure. A amplifies the input signal with the help of B and drives the load. The amplifier C is a unit gain inverter, which uses the D drive load. The gain of the high output amplifier (displayed component value) is 10, but it can be easily changed by changing R1 or R2.

Single -gain programmable single power amplifier

Four Road OP490 and DAC8408 Four Road 8 -bit CMOS DAC combination, creating a four -way programming gain with only 140 mAh in a static power supply. A amplifier. The digital code in DAC is easily set by the microprocessor. It determines the ratio between the fixed DAC feedback resistor and the resistance of the DAC trapezoid diagram. The DAC trapezoidal chart is presented to the feedback circuit of the computing amplifier. The gain of each amplifier is:

The 8 -bit of the decimal number is equal to the current number code. If the digital code in the DAC consists of all zero, the feedback loop will be opened, causing the calculator to output saturation. Place 10 mcwage resistors in a parallel position with the DAC feedback circuit to eliminate this problem, but the gain accuracy is small. 2.5V reference voltage makes the amplifier bias towards the center of the linear area, providing the maximum output swing.

The size of the shape

The size unit is inch and (mm).