Features

Single/dual -power operation: 1.6 V to 36 V, ± 0.8V to ± 18V

Real single power operation; input and output voltage range includes ground

Low power current: maximum 20 A

High -output driver: 5MA minimum value

Low input offset voltage: maximum 150 V

High -open ring gain: 700 V/mv min

Excellence PSRR: 5.6 V/V maximum value

Standard 741 pin output, zero to v -

] OP90 is a high -performance, micro -power consumption amplifier, a single power supply from 1.6 V to 36 V or a dual power supply from ± 0.8 V to ± 18 V. The input voltage range includes the negative electrode guide, allowing the OP90 to adjust the input signal downward in the single power operation. The output amplitude of the OP90 also includes a ground. When a single power supply runs, the ""zero -entry and zero"" operation can be achieved.

The static power supply current of the OP90 is less than 20μA, and it can provide output current of more than 5 mA to the load. The input offset voltage is less than 150 μV and does not need to be zero. The gain exceeds 700,000, and the co -model suppression is better than 100dB. In the battery power supply system, the power suppression of less than 5.6 μV/V will minimize the bias voltage.

The low -loss voltage and high gain provided by OP90 brings accurate performance for micro -power applications. The minimum voltage and current of OP90 requires suitable battery and solar applications, such as portable instruments, remote sensors and satellites.

pin connection

OP90 -typical performance features

Application information

Battery power application

OP90 can work under the minimum power supply voltage of 1.6V, or work under dual power conditions of ± 0.8V, and only requires 14Pa power supply Current. In many circuits from batteries, OP90 can run continuously for thousands of hours before the battery needs to be replaced, thereby reducing the time and operating costs of equipment 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. OP90's low power voltage requirements, plus the flat discharge characteristics of lithium batteries, indicate that the OP90 can run within the entire service life of the battery. Figure 1 shows a 1AH lithium battery that is powered by OP90The typical discharge characteristics, and the OP90 in turn drives the output swing to 100k load.

Input voltage protection

OP90 uses the PNP input stage, protecting resistance, inverter and non -inverse input series connect Essence The combination of high breakdown and protective resistance of PNP transistors provides a large number of input protection, so that the input can obtain a voltage of 20 V outside any of the power supply without damaging the amplifier.

Disposal zero The offset zero circuit in FIG. 4 provides a 6 millivol to offset adjustment range. As shown in Figure 5, the 100 k the resistor and the shift zero potentiometer are connected in series, which can be reduced to 400 μV. Essence Shimply zero will not affect TCVOS performance.

Test circuit

The output voltage range of the single power supply

In the operating Ground. This allows the real ""zero -entry and zero"" operating room output stage to provide actively pulling down to about 0.8 volt of the ground. When this level is below this level, the load resistance of up to 1 m can lower the output to zero.

In the range from ground to 0.8 V, the voltage gain of the OP90 is equal to the data table specifications. The output current source is maintained within the entire voltage range including ground.

Application

Battery power supply reference voltage

The circuit in FIG. 6 is a battery -powered benchmark voltage, which consumes only 17 μA power current. At this level, two AA cells can provide energy for this reference within 18 months. When the output voltage is 1.23 V@25 ° C, the benchmark drift is only 5.5 μV/° C within the industrial temperature range. The load adjustment is 85 μV/mA, and the line adjustment is 120 μV/V.

The design of the benchmark source is based on gap technology. The zooms of resistance R1 and R2 will generate different currents in Q1 and Q2. The resulting VBE loss generates the temperature ratio voltage on the R3, and then generates a larger temperature ratio voltage between R4 and R5. This voltage appears on the output of the VBE of Q1, and the temperature coefficient of Q1 is the opposite. Adjust the output to 1.23 V at 25 ° C, which can generate minimum temperature drift. The band gap benchmark can have a startup problem. In the case of R1 and R2, there is no current, OP90 exceeds the positive input range limit and has an unfarished output state. Taking the pin 5 (offset adjustment pin) to the ground, forcing high output under these conditions to ensure reliable startup without significantly reduced the offset drift of the OP90.

Single transport full -wave rectifier FIG. 7 shows a full -wave rectifier circuit that can provide absolute input signals with up to ± 2.5 V Value, even power supply from a single 5 V power supply. For negative input, the amplifier acts as a unit gain reverse phase. The positive signal forced the calculation amplifier to output ground. 1N914 diode reverse bias, the signal reaches the output end through R1 and R2. Because the asymmetry of input impedance depends on the output impedance. For constant load impedance, it can be corrected by reducing R2. The second OP90 can buffer change or heavy load. Figure 8 shows the output of a full-wave rectifier with 4VP-P and 10Hz input signal.

2 Line 4MAh to 20mAh current transmitter

The current transmitter in FIG. In the output of 20 mia, the output voltage and the input voltage are linearly proportional. The linearity of the transmitter exceeds 0.004%, and the line suppression is 0.0005%/Volt.

The bias of the current transmitter is provided by Ref-02EZ. OP90EZ adjusts the output current to meet the sum of the current of non -switching nodes:

For the value shown in Figure 9,

The output full label is 20 mAh, and the input is 100 millivol. The adjustment of R2 will provide fine -tuning, and the adjustment of R1 will provide a fine -tuning gain. These fine -tuning do not interact, because the non -conversion input of the OP90 is located on the virtual ground. Schottky diode, D1, prevent input voltage peaks from lowering the non -reversal input of more than 300 millivol to invert input. If there is no diode, this peak will cause the phase reversal of the OP90 and may cause the transmitter to lock it. The softness of this circuit has from 10 to 40 volts. The voltage reference output can provide a sensor of up to 2 mA.

Micro -power voltage control oscillator

Two OP90 and a cheap four -yuan CMOS switch combination to form the precision VCO shown in Figure 10. The circuit provides triangle and square wave output, and only extracts 50μA current from a 5V power supply. A1 acts as the integror; S1 switches the charging current symmetrically to generate positive and negative slopes. The integral device is based on A2, and A2 is used as a Schmidt trigger. The accurate lag is 1.67V, which is set by resistance R5, R6 and R7 and related CMOS switches. The output of A1 is a triangular wave with the upper and lower levels of 3.33V and 1.67V, respectively. The output of A2 is a square wave, which is almost rail -to -track. 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 is in hundreds of HertzGood work.

Micro -power single -power instrumentation amplifier

The simple instrument amplifier in FIG. 11 provides a co -mode suppression of more than 110 decibels, and only absorbs 15μA power current. Feedback to fine -tuning the tube, not input. This enables a single amplifier to provide a differential conversion and excellent co -model suppression capabilities. The distortion of the instrument amplifier is the distortion of the differential pairs, so the circuit is limited to high -gain applications. In the output range of 2.5V, when the gain is 500 to 1,000, the non -linearity is less than 0.1%. The resistor R3 and R4 set the voltage gain, and generate a 1000 gain under the display value. The gain temperature of the instrument amplifier is only 50 ppm/° C.

The offset voltage is less than 150 μV and the drift is less than 2 μV/° C. The input and output voltage range of OP90 includes negative, allowing the instrument amplifier to provide real ""zero input and zero output"" operation.

Single power current monitor

The current monitoring basically includes the voltage drop on the amplifier resistance, the resistance and the measured current into a series. The difficulty is that only a small voltage drop can tolerate, while the low -precision computing amplifier greatly limits the overall resolution. The resolution of the single power current monitor in FIG. 12 is 10 μA, which can monitor the current of 30 mA. This range can be adjusted by changing the current detection resistor R1. When the total current of the system is measured, the power current of the current monitor may be required in the final result, which by bypass the current to detect the resistor by bypass the current.

By adjusting the offset and fine -tuning potential meter R2, the current can be measured and calibrated (together with the remaining offset). This will produce a intentional offset related to temperature. However, the power supply current of the OP90 is also proportional to the temperature. These two effects are often rail currents in R4 and R5, and they also bypass R1, which can be explained by fine -tuning gain.

The size of the shape

The size unit is inch and (mm).