Features

High Bandwidth: 150MHz

set 16 -bit in 150ns [

123]

Low noise: 3NV/√Hz

Low distortion: 0.003% #8226;

Low power: 5.5V at 9.5ma (typical value)

Close to 5 μA units stable

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excellent output motion: (V+ 100MV to (v )+100mv

Single power supply: +2.7V to+5.5V

Small packaging: MSOP and SOT23

Application [[[[[[[

; 123] 16 -bit ADC input drive

Low noise front placement large

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Active filtering

Explanation

OPA300 and OPA301 series high -speed voltage feedback CMOS operational amplifiers are designed for 16 -bit resolution systems. OPA300 /OPA301 series has a stable unit gain and good stability and harmonious wave distortion specifications. Low -power consumption applications benefit from low static currents. OPA300 and OPA2300 have digital shutdown (enabled) functions, providing additional energy saving during free. OPA300/OPA301 The series is optimized for the operation of the single power supply, and provides an excellent output swing and a good co -mode range.

OPA300 and OPA301 series computing amplifiers have a unit gain bandwidth of 150MHz, low 3nv/√Hz voltage noise, 30ns 30ns 0.1%stable. From 2.7V (± 1.35V) to 5.5V (± 2.75V) single power operation and the available shutdown function of reducing the power current to 5μA is very useful for portable low power consumption. OPA300 and OPA301 have SOs SO -8 and SOT-23 package .OPA2300 can be used for MSOP-10, OPA2301 can be used for SO-8 and MSOP-8. All models are specified in 40 ° C to+125 ° CWithin the industrial temperature range.

Typical application

Packaging/ordering information

(1), the latest packaging related to packaging For order information, see the packaging options at the end of this document.

Typical features

Unless otherwise explained, all technical specifications are connected to VS/2 when all technical specifications are in TA u003d 25 ° C, vs u003d 5V, RL u003d 150

Application information [123 ] OPA300 and OPA301 series single -power CMOS operational amplifier design is used to interface with 16 -bit module converter (ADC) with high -speed 16 -bit modulus. This series has a width of 150MHz bandwidth, fast 150ns stabilizing to 16-bit, and high open ring gains. It provides excellent performance in small SO-8 and small SOT23 packages.

Operation theory

OPA300 and OPA301 series operations amplifiers use typical two -stage topological structures, as shown in Figure 1. Differential input has a deviation to maximize the conversion rate, without damage to stability or bandwidth. Folding the Communist source code from the input pair and providing a differential signal to the AB output level. Class AB output level allows rail pairing output swing, with high impedance loads ( gt; 2K ), and usually 100 millivolves from the power rail. When the load is 10 it can realize the useful output swing, and still maintain a high open -loop gain. See the relationship between typical output voltage swing and output current.

Working voltage

OPA300/OPA301 series operational amplifier parameters are completely specified between+2.7V to+5.5V. 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.

PCB layout

Like most high -speed computing amplifiers, the circuit board layout needs to pay special attention to maximize the exchange and DC performance. The use of ground layers, short -drawing lengths, and high -quality bypass containers will minimize leaks that may damage signal quality to the greatest extent. The potential of the protective ring is as close to the input pin as much as possible, which helps to minimize the leakage of the circuit board.

Input and ESD Protection

All OPA300/OPA30The pins of the 1 series of computing amplifiers are protected by internal ESD protection diode for static protection, as shown in Figure 2. As described by absolute maximum rated values, if the external current is limited to 10mA, these diode will provide drive protection. Any input current exceeding the absolute maximum rated value, or running for a long time under the maximum rated value, will shorten the life of the amplifier.

Enable function

The shutdown function of OPA300 and OPA2300 is based on the negative power supply voltage of the computing amplifier. Logic levels are highly enabled by operational amplifier. Effective logic high levels are defined at 2.5V higher than the negative power supply that enables the pins. Low effective logic is defined as above the negative power pin lt; 0.8V. 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. If the pin is not connected to a valid high or low voltage, the internal circuit will pull the node to make the components work.

Logic input is high impedance CMOS input. For the application of battery power supply, this function can be used to greatly reduce the average current and extend the battery life. The enable time is 10 μs; the disable time is 1 μs. When disabled, the output assumes a high impedance state. This allows OPA300 to work as a door control amplifier, or repeat it on a public simulation output bus.

Drive capacitance load

When using a high -speed computing amplifier, considering the impact of capacitor load on the stability of the amplifier is very important. The capacitance load will interact with the output impedance of the computing amplifier, and depends on the capacitor value, which may significantly reduce the gain bandwidth and the introduction of the peak. In order to reduce the impact of the capacitance load and allow additional capacitance load drivers, a series resistance is placed between the output and the load. This will reduce bandwidth, but allows stable operation under the capacitor load. Figure 3 illustrates the recommended relationship between resistance and capacitance.

The amplifier configured in the unit gain is most likely to be affected by the problem of stability. The typical features of the OPA300/OPA301 series, that is, frequency response and capacitance load, describe the relationship between capacitance load and stability. In terms of unit gain, the OPA300/OPA301 series can drive a small amount of capacitor load without affecting stability. The board -level parasitic capacitance usually falls in the extension of Pipchora or larger. It should minimize it through a good circuit board layout practice to avoid damage to the stability of OPA300/OPA301.

Drive 16 -bit ADC

OPA300/OPA301 series with excellent THD+noise, even at the frequency greater than 1MHz, the 16 -bit stable time is 150ns. Figure 4 shows an overall single power solution for high -speed data collectioncase.OPA300/OPA301 directly drives ADS8401, a 16 -bit data converter of 1.25 mega sampling (MSPS) per second.The inverter gain of OPA300/OPA301 is 1, and the single power supply is 5V.Table 1 summarizes the performance results of OPA300/OPA301.