Features

Low power current: maximum 600 μA

OP07 type performance

offset voltage: maximum 20 μV

offset voltage drift: maximum 0.6 μV/° C

Extremely low -pressure current

25 ° C: maximum 100 PA

55 ° C to+125 ° C: maximum 250 PA

High -co -model suppression: minimum 114 db

Extended industrial temperature range: 40 ° C to+85 ° C

General description

] OP97 is a low -power alternative of industrial standard OP07 precision amplifiers. OP97 maintains the performance standards set by OP07, and at the same time, only 600 μA power current is used, less than 1/6 of OP07. The bias voltage is over 25 μV, and the temperature drift is lower than 0.6 μV/° C. Most circuits do not require external bias fine -tuning.

In several aspects, the OP07 specifications have been improved. It is worth noting that the partial pressure current is still less than 250 Pa within the entire military temperature range. OP97 is an ideal choice for precision long -term points or sampling maintenance circuits that must work at high temperatures.

Within a wider common mode or power supply voltage range, the co -mode suppression and power suppression of the OP97 have also been improved, at least 114 decibels. The excellent PSR, the specified power supply range is ± 2.25 V to ± 20 V, and the minimum power requirements of the OP97 make OP97 the first choice for portable and battery power supply instruments.

OP97 conforms to OP07 pin output, the zero potential difference meter is connected between pin 1 and pin 8, and the wiper is connected to V+. OP97 uses AD725, OP05, OP07, OP12, and PM1012 amplifier upgrade circuit design. It can replace the 741 amplifier without zero or zero circuit in the circuit.

引脚连接

典型性能特征[123 ]

Application information

OP97 is a low -power alternative to industrial standard precision operational amplifiers OP07. OP97 can be directly replaced with OP07, OP77, AD725, and PM1012 sockets with lower performance improvement and/or lower power consumption. If you do not use zero -regulating circuits, you can insert sockets that meet the 741 pin. Usually, the zero -position circuit used with the early generation amplifier becomes superfluous due to the extremely low offset voltage of the OP97, and it canRemove without damage to the performance of the circuit.

The extremely low bias current within the entire military temperature range makes OP97 attractive in the sample and maintaining the amplifier, the peak detector, and the number of amplifiers that must work within the wide temperature range. OP97 does not require a balanced input resistance. Even in the case of imbalance, high -source resistance will only reduce the offset voltage and TCVOS to a minimum.

The input pins of OP97 are protected by the backbone of the back to prevent a large differential voltage. Flow -limited resistors are not used to maintain low noise performance. If the differential voltage of the input terminal is expected to be higher than ± 1 V, a series resistor must be used to limit the current to a maximum of 10 mA. The co -mode voltage of the input terminal is not limited and may change within the entire range of the power supply voltage used.

OP97 is very small for the operation of the power rail, and it is stipulated that it runs when the power supply voltage is low to ± 2 V. Generally, the scope of the co -mode extends to the 1V range of any orbit. When using a 10kΩ load, the output usually fluctuates within the range of 1V.

Use the same circuit as OP07 to achieve zero -position. The potential meter between 5 kΩ and 100 kΩ is connected between the needle 1 and the pin 8 of the pin, and the water scratchr is connected to the positive electrode power supply. The range of fine -tuning is between 300 μV and 850 μV, depending on the internal fine -tuning of the device.

AC performance

The communication characteristics of OP97 are highly stable in the entire working temperature range. The unit gain small signal response is shown in Figure 30. The capacitance load on the output end is extremely tolerant. Even under the 1000 PF load, the OP97 shows an excellent response (see Figure 31). In large signal applications, if the amplifier is configured with the usual unit gain configuration, in the transient period, the input protection diode effectively connects the input terminal to the output end. The output enters the short -circuit current limit, and the current flows through the protection diode. By setting up feedback resistors between the output and the inverter input terminal, the large signal transient response is improved. Figure 32 shows the large signal response of OP97 under unit gain, and the feedback resistance is 10 kΩ. The unit gain follows the circuit as shown in Figure 33.

Calculating pins (pin 5) can be used to increase phase habits of OP97 or reduce gain bandwidth with gain greater than 10 o'clock.

Protection and shielding

In order to maintain the high input impedance of OP97, the layout and the layout of the circuit board and the layout of the circuit board and the Be careful in manufacturing. The surface of the board must be kept clean and no moisture. It is recommended to use the shelf coating to provide a moisture -proof layer. Even a clean PCB may have a leakage current of 100Pa between adjacent lines; therefore, the protection ring is used around the input end. The protective line runs under the voltage close to the input voltage, soThe leakage current is the smallest. In non -switching applications, the protection ring is connected to the co -mode voltage of the inverter input (pin 2). In reverse applications, both inputs remain on the ground, so the protection tracking should be grounded. Do protection marks on both sides of the circuit board.

High impedance circuit is easily affected by radio frequency pickups, line frequency buzzing and switching power radiation noise. It is usually necessary to close the sensitive simulation segment in the ground shield to prevent excessive picking noise. The twisted line helps to suppress the buzzing of the line frequency.

As an output amplifier for high -resolution CMOS DAC, OP97 is a good choice. Even within a wide range of temperature, its tightly adjusted bias voltage and minimum bias current will hardly cause linearity to degenerate.

FIG. 36 shows a multi -function monitor circuit, which can usually be sensing current between ± 15 V power. This makes it very suitable for sensing currents in applications such as the bridge driver, and the two -way current is related to the changes in the voltage of the Communist Party. OP97's 114DB CMRR enables the contribution of the amplifier to the co -mode error to ignore, leaving only errors caused by different resistance ratio. Ideally, R2/R4 u003d R3/R5.

The digital programmable gain amplifier shown in FIG. 38 has a 12 -bit gain resolution, and the 10 -bit gain linear range is 1024. The low bias current of OP97 maintains this linear, while C1 limits the noise voltage bandwidth and allows accurately measured to micro -level.

The low -frequency performance of many high -speed amplifiers is not ideal. The combined amplifier consists of high -precision, slow device (such as OP97) and faster devices (such as AD8610), so that the performance of high -frequency limit from DC to AD8610 is consistent, and the width of the gain band of AD8610 is 25MHz. The circuit shown in FIG. 39 realizes this. The AD8610 provides high -frequency release. OP97 operates low -frequency signals and provides offset correction. The offset voltage and drift of the circuit are controlled by OP97.

[1] noise of 10Hz noise on 10Hz noise The voltage density performed a sampling test. If there are requirements, 100%noise testing equipment can be provided.

[2] Sample test.

[3] It is guaranteed by CMR testing.

[4] Design guarantee.

[5] It is guaranteed by CMR testing.