OPA363, OPA236...

  • 2022-09-16 16:00:09

OPA363, OPA2363, OPA364, OPA2364, OPA4364 is 1.8V, 7MHz, 90dB CMRR, single power supply, rail -to -rail I/O computing amplifier

Features

1.8V operation

micro packaging

bandwidth: 7MHz

# 8226; cmrr: 90db (typical)

conversion rate: 5V/μs

Low offset: 500 μV (maximum)

# 8226; Static current: 750 μA/channel (maximum)

shutdown mode: lt; 1μA/channel

signal adjustment

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Data Collection

Process control

Active filter

Test equipment [123 123 ]

Instructions

OPA363

and OPA364 series are high -performance CMOS operational amplifiers, which are optimized for extremely low voltage and single power operations. These micro, low -cost amplifiers are designed for single power supply at 1.8V (± 0.9V) to 5.5V (± 2.75V). Applications include sensor amplification and signal regulation of battery power supply systems. OPA363 and OPA364 series provide excellent CMRR without crossing the traditional free input stage. This allows good performance when driving the modulus converter, and does not reduce the differential lineivity and THD. The input co -modular range includes positive and negative power. The output voltage swing is within 10mv range of the rail.

The OPA363 series includes the shutdown mode. In the lower logical control, the amplifier can be switched from normal work to a spare current less than 1 μA.

A single version includes miniature SOT23-5 (SOT23-6 for shutdown) and SO-8. The dual versions are MSOP-8, MSOP-10, UQFN-16. And SO-8 package. Four yuan packaging is TSSOP-14 and SO-14 packaging. All models work at a temperature of -40 ° C to+125 ° C.

Typical features

TA +25 ° C, RL 10K Connect to vs/2, vout vs/2, vcm vs/2, unless there is another instructions for another explanation Essence

Application information OPA363 and OPA364 series operation amplifiers are rail pairs Rail transport is calculated, with excellent CMRR. Low noise, low offset and low -band width with as low as ± 0.9V. OPA363 has an additional tube foot for closing/enable function. These people do not show phase reversal, and unified gains are stable. OPA363 and OPA364 series are stipulated within the industrial temperature range of -40 ° C to+125 ° C, which can provide precise performance for various applications.

Rail -to -rail input

OPA363 and OPA364 have good rail pairing characteristics, and the power supply voltage is low to ± 0.9V. The input co -mode voltage range of the OPA363 and OPA364 series exceeds 100mV of the power rail. The unique input topology of OPA363 and OPA364 eliminates the typical input offset transition zone of RailTo-RAIL complementary computing amplifiers, allowing OPA363 and OPA364 to provide excellent co-mode performance throughout the scope of co-mode input, as shown in Figure 21. This feature can prevent the difference in linear errors and THD degradation of driving A/D converters. Figure 22 shows the simplified schematic diagram of OPA363 and OPA364.

Working voltage

OPA363 and OPA364 series operation amplifiers parameters are completely specified between+1.8V to+5.5V. A single 0.1 μF bypass electrical container should be placed on the power pins and closer to the component as much as possible. The power supply voltage higher than 5.5V (absolute maximum value) may cause permanent damage to the amplifier. Many specifications are suitable for -40 ° C to+125 ° C. The typical feature shows the parameters that significantly changes with the working voltage or temperature.

Enable function

The shutdown (enabled) function of OPA363 is based on the negative power voltage of the operation amplifier. Logic levels are highly enabled by operational amplifier. Effective logic high voltage is defined as a 75%voltage of 75%of the positive power supply for enabled pins. Effective logic high signals can be up to 5.5V negative power supply, independent of the positive power supply voltage. The effective logic is defined as lower than 0.8V above the negative power pins. If you use a dual power supply or split power supply, you should pay attention to ensure that the logic input signal is correctly referred to the negative power supply voltage. The pin should be connected to an effective high or low voltage or driver, not the left.

Logic input is high impedance CMOS input. Dual operational amplifier provides separate logic input. For the application of battery power supply, this function can be used to significantly reduce the average current and extend the battery life. The enable time is 20 μs; the disabled time is 1 μs. When disabled, the output is high impedance. This allows OPA363 to run as a door control amplifier, or repeats its output on the public simulation output bus.

Capacity load

OPA363 and OPA364 series operational amplifiers can drive various capacitance loads. However, under certain conditions, all operationsThe amplifier 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 output resistance of the capacitance load and the calculation amplifier reacts, which generates poles in the small signal response, thereby reducing the phase margin.

In terms of unit gain, OPA363 and OPA364 series operations amplifiers perform well, and the pure capacitor load is as high as about 1000PF. ESR (equivalent series resistance) of load capacitors is enough to allow OPA363 and OPA364 to directly drive very large capacitance loads ( gt; 1 μF). Increasing gain and enhancement of the capacity of the amplifier driver more capacitance; see Figure 13.

In the unit gain configuration, a method of improving the capacitor load drive is to connect a resistor from 10Ω to 20Ω at the output end, as shown in Figure 23. This greatly reduces the bell when the large capacitor load is loaded. However, if there is a resistor load in parallel to the capacitor load, it will generate a divisioner, introduce DC errors at the output end, and slightly reduce the output swing. This error may be irrelevant. For example, when RL 10kΩ, RS 20Ω, the output error is only 0.2%.

Input and ESD protection

All OPA363 and OPA364 pins are used in internal ESD protection diode for static protection. As described by absolute maximum rated values, as shown in Figure 24, if the external current is limited to 10mA, these diode will provide drive protection.

Realizing the negative output swing of the op amp

Some applications require accurate output voltage from 0V to the positive standard voltage. A good single power op amp can swing within a few millivolves from the single power site, but when the output is driven to 0V, the output level of the amplifier will prevent the output from reaching the negative power rail of the amplifier.

Opa363 or OPA364 output can swing to the ground on one power, or slightly lower than the ground. To do this, you need to use another resistance and a negative power supply than an operator. A drop -down resistor can be connected between the output end and the additional negative power supply, and the output end is pulled below the output value, as shown in Figure 25.

This technology does not apply to all operational amplifiers. If the output level is maintained about 500 μA, the output stage of OPA363 and OPA364 allows the output voltage to lower the output voltage of most computing amplifiers. In order to calculate the appropriate load resistance and negative power, RL --V/500μA. OPA363 and OPA364 have good performance under the conditions, and maintain good accuracy within the range of 0V and -10mv. Restrictions and nonlinear occurring below -10mv, if you loseWhen the driver is driven again to 10mV, linear returns.

Cushion reference voltage

Many single power supply applications require intermediate power reference voltage. OPA363 and OPA364 have excellent capacitor load driving capabilities, which can be configured to provide 0.9V reference voltage, as shown in Figure 26. For proper load precautions, see the capacitance load section.

Directly drive ADS8324 and MSP430

OPA363 and OPA364 series operational amplifiers optimized for driving medium -speed (100kHz) sampling A/D converter. However, they also provide excellent performance for high -speed inverters. OPA363 and OPA364 -free input level direct -drive A/D converters will not reduce different lineivity and THD. They provide an effective method to buffer the input capacitance of the A/D converter and the injecting the charge generated, and at the same time provide a signal gain. Figure 27 and 28 show OPA363 and OPA364 configured configured to drive the ADS8324 and 12 -bit A/D converters on the MSP430.

Audio applications

OPA363 and OPA364 operational amplifier series have a linear bias voltage throughout the entire input co -mode range. Combined with low noise, this feature makes OPA363 and OPA364 suitable for audio applications. Single power supply 1.8V operation allows OPA2363

and OPA2364 to become the best candidates for double -dimensional sound headset drivers and microphone front placeders in portable stereo devices, see Figure 29 and Figure 30.

Active filter

Low harmonic distortion and noise specifications, coupled with high gain and conversion rate, making OPA363 and OPA364 the most active filtering most Good candidate. FIG. 31 shows OPA2363 configured with low distortion, third -order GIC (general guide resistance converter) filter. FIG. 32 shows the implementation of Sallen-Key, triode, and low-pass Bessel filter.