Features

● Low offset: 5mv (maximum)

● Low IB: 10Pa (maximum)

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● High Bandwidth: 6.5MHz

● Rail input and output

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Single power supply: +2.3 V to+5.5V

● Torter: OPAX373

● Standardized the temperature as high as+125 ° C

● Micro-encapsulated: SOT23-5, SOT23-6, SOT23-8, and DFN-10

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● Battery power supply equipment

● Active filter

● Drive A/D Converter Instructions

OPA373 and OPA374 series operation amplifiers are low power consumption, low cost, with excellent bandwidth (6.5MHz) and conversion rate (5V/μs). The input range is extended to 200mV outside the orbit, and the output range is within the rail 25mv range. Speed/power ratio and small size make it an ideal choice for portable and battery power supply applications.

The OPA373 series includes closing mode. Under logical control, the amplifier can be switched from normal work to a standby current less than 1 μA.

OPA373 and OPA374 series operators are suitable for single power or dual power supply with+2.7V to+5.5V, and the working voltage is+2.3V to+5.5V. All types of operational amplifiers are suitable for 40 ° C to+125 ° C.

(1) As shown in the figure, SOT23-6's needle 1 is determined by adjusting the direction of the packaging mark.

(2) NC indicates that there is no internal connection.

Typical features

Unless otherwise explained, when TA u003d+25 ° C, RL u003d 10K connect to vs/2, and vout u003d vs/2.

Application OPA373 and OPA374 series operation amplifiers ofIt is suitable for extensive general applications. The rail input and output make it an ideal choice for the driver sampling modulus converter (ADC). Outstanding communication performance makes it very suitable for audio applications. AB -level output level can drive 100K load between any point between V+and ground. The input co -mode voltage range includes two orbits, allowing OPA373 and OPA374 series operations amplifiers to be used for almost any single power supply application, up to a power supply voltage of up to+5.5V. Especially during low -orbit operation, the dynamic input and output range of the track increased significantly. 0.01 μF ceramic capacitor should be used to bypass the power.

Working voltage

OPA373 and OPA374 operational amplifier in the power supply range of+2.7V to+5.5V (± 1.35V to ± 2.75V). However, the range of power voltage is+2.3V to+5.5V (± 1.15V to ± 2.75V). The power supply voltage higher than 7.0V (absolute maximum value) will permanently damage the amplifier. See the typical feature part of this data table with the parameters of the power supply voltage or temperature.

Common mode voltage range

The input co -mode voltage range of the OPA373 and OPA374 series exceeds 200mV of the power rail. This is achieved through a complementary input level and a N channel input differential parallel parallel parallel parallel parallel. The N-channel is effective for input voltage near the track, usually above the positive power supply (V+) -1.65V to 200MV, and the P-channel is to 200MV from the below the negative electrode power supply (V+ 1.65V) Enter open. There is a 500MV transition zone, usually (V+) -1.9V to (V+) -1.4V, and both pairs are open. The 500MV transition zone shown in Figure 1 can change ± 300mV with the process. Therefore, at the low-end, the range of the transition zone (both stages) is (V+)-2.2V to (V+)-1.7V, and high-end (V+) -1.6V to (V+)-1.1V. In the 500MV transition zone, PSRR, CMRR, offset voltage, offset drift and THD may be reduced compared with the operation outside the area.

Rail -to -rail input

Input the consensus range from (v ) 0.2V to (V ++ 0.2V To. For normal operations, the input should be limited to this range. The absolute maximum input voltage is a power supply of more than 500 millivoli. Although the input of the input co -mode but less than the maximum input voltage is invalid, it will not cause any damage to the calculator. Unlike other computing amplifiers, if the input current is limited, the input may exceed the power supply without a phase reversal.as shown in picture 2.

Under normal circumstances, the input bias current is about 500FA; however, the input voltage exceeds the power supply exceeds 500mV, which will cause excess current inflow or outflow input pins. If the current on the input pin is limited to 10 mAh, it can tolerate the instantaneous voltage of the power supply of 500 millivoltors. This is easy to implement with an input resistance; see Figure 3. (Many input signals inherent inherent currents are limited to less than 10mA, so there is no need to restrict the resistor.)

Rail output

AB output stage adoption use The co -source transistor realizes rail transition. For light resistance loads ( gt; 100k ), the output voltage can usually swing from the power rail to 18mv. Under the medium resistance load (5K to 50K ), the output can usually swing from the power rail to 100MV, and maintain a high opening of the ring. For more information, see the typical characteristic curve, output voltage swing and output current.

Capability load and stability

OPA373 series operational amplifier can drive various capacitance loads. However, in some cases, all operational amplifiers may become unstable. The configuration, gain, and load value of the operation amplifier are only a few factors to consider when determining the stability. The computing amplifier of the unit gain structure is most likely to be affected by the capacitance load. The capacitance load and the calculation amplifier output resistance and any additional load resistance react, and generate a pole in the small signal response to reduce the phase margin. The OPA373 series operational amplifier performs well under the configuration of the unit gain, and the pure capacitance load is as high as about 250pf. Increasing gain allows the amplifier to drive more capacitors. For more detailed information, see typical characteristic curves, small signal super adjustment and capacitance load.

A method of capacitive load driving in the improvement unit gain configuration is to connect a small (10 to 20 ) resistance at the output end, as shown in Figure 4. This greatly reduces the bell, while maintaining the DC performance of pure capacitance load. When the resistance load is connected with the capacitance load, the RS must be placed in the feedback loop, as shown in the figure to allow the feedback loop to compensate the signs produced by RS and RL.

In the configuration of the unit gain inverter, the phase margin can be reduced through the reaction between the capacitor and the gain setting of the amplifier input terminal, thereby reducing the capacitor load driver. The best performance can be obtained by using small value resistors. However, when a large value resistance cannot be avoided, a small (4PF to 6PF) capacitor CFB can be inserted in the feedback, as shown in Figure 5. This is significantly reduced by compensating the impact of the capacitor CIN (including the amplifier input capacitance and printing circuit board (PCP) parasitic capacitor).

For example, when the 100PF load in the configuration of the driving unit gain inverter configuration, the 6PF capacitor with 10K feedback resistor will be reduced from 57%from 57% To 12%, as shown in Figure 6.

Drive ADC

OPA373 and OPA374 series operational amplifiers are optimized to drive medium -speed ADC. OPA373 and OPA374 computing amplifiers buffer ADC input capacitors and the charge injection generated by this, and at the same time provide signal gain.

FIG. 7 shows OPA373 driving ADS7816 in the basic non -conversion configuration, as shown in Figure 7. ADS7816 is a 12-bit, micro-power sampling converter in the MSOP-8 package. When used with the low -power micro -packaging of OPA373, this combination is an ideal choice for limited space and low power consumption applications. In this configuration, the RC network of the ADC input terminal can be used to provide anti -mixture filtering. FIG. 8 shows OPA373 that drives ADS7816 in the voice belt filter data collection system. This small, low -cost solution provides necessary amplification and signal regulation to directly connect to the polar microphone interface. The circuit will work in the case of VS u003d 2.7 V to 5 V.

OPA373 is displayed in the reversal configuration described in FIG. 9. In this configuration, the filter can be completed by the capacitor on the feedback resistance.

Enable/close

OPA373 and OPA374 series operational amplifiers usually require a static current of 585μA. OPA373's enable/off function allows turning off the operation amplifier to reduce the current to less than 1 μA.

dfn package

The bottom of the package also has two sides called DF-73 packets. This lead -free, closer to the chip size packaging to maximize the space of the circuit board, and enhances thermal characteristics and electrical characteristics through a bare pad. DFN packaging volume is small, the wiring area is small, the heat performance is improved, the power performance is improved, and the pins are consistent with other commonly used packaging (such as So and MSOP). In addition, there is no external lead to eliminate the problem of bending.

DFN packaging can be easily installed using standard PCP assembly technology.

The exposed lead framework mold pad at the bottom of the component shall be connected to V . Layout Guide

The leading frame mold pad should be welded on the PCB hot pad. At the end of this data table, there is a mechanical data table that displays examples of layout. According to the requirements of the assembly process, the layout may be improvedEssence

The mechanical drawings at the end of this data list list the physical dimensions of packaging and pads.The five holes in the platform pattern are optional, which is used to connect the radiating pores of the leading frame of the lead frame and the PCB heat sink area.In temperature circulation, keys, encapsulation shear, and similar board tests, welded exposure pads have significantly improved board -level reliability.

Even in low -power applications, bare pads must be welded to PCB to provide structural integrity and long -term reliability.