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MC33304 bảng dữ liệu(PDF) 6 Page - ON Semiconductor |
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MC33304 bảng dữ liệu(HTML) 6 Page - ON Semiconductor |
6 / 12 page MC33304 6 MOTOROLA ANALOG IC DEVICE DATA DEVICE DESCRIPTION The MC33304 will begin to function at power supply voltages as low as VS = ±0.8 V. The device has the ability to swing rail–to–rail on both the input and the output. Since the common mode input voltage range extends from VCC to VEE, it can be operated with either single or split voltage supplies. The MC33304 is guaranteed not to latch up or phase reverse over the entire common mode range. However, the output could go into phase reversal state if input voltage is set higher than +VCC or –VEE. When power is initially applied, the part may start to operate in the awakemode. This occurs because of bias currents being generated from the charging of the internal capacitors. When this occurs, the user will have to wait approximately 1.5 seconds before the device will switch back to the sleepmode. The amplifier is designed to switch from sleepmode to awakemode whenever the output current exceeds a preset current threshold (ITH) of approximately 200 µA. As a result, the output switching threshold voltage (VST) is controlled by the output loading resistance (RL). Large valued load resistors require a large output voltage to switch, but reduce unwanted transitions to the awakemode. Most of the transition time is consumed slewing in the sleepmode until VST is reached, therefore, small values of RL allow rapid transition to the awakemode. The output switching threshold voltage (VST) is higher for the larger values of RL, requiring the amplifier to slew longer in the slower sleepmode state before switching to the awakemode. Although typically 200 µA, ITH varies with supply voltage, temperature and the load resistance. Generally, any current loading on the ouput which causes a current greater than ITH to flow will switch the amplifier into the awakemode. This includes transition currents like those generated by charging load capacitances. In fact, the maximum capacitance that can be driven while attempting to remain in the sleepmode is approximately 300 pF. The awakemode to sleepmode transition time is controlled by an internal delay circuit, which is necessary to prevent the amplifier from going to sleep during every zero crossing of the output waveform. This delay circuit also eliminates the crossover distortion commonly found in micropower amplifiers. The MC33304 rail–to–rail sleepmode operational amplifier is unique in its ability to swing rail–to–rail on both the input and output using a bipolar design. This offers a low noise and wide common mode input voltage range. Since the common mode input voltage range extends from VCC to VEE, it can be operated with either single or split voltage supplies. Rail–to–rail performance is achieved at the input of the amplifiers by using parallel NPN–PNP differential input stages. When the inputs are within 800 mV of the negative rail, the PNP stage is on. When the inputs are more than 800 mV above VEE, the NPN stage is on. This switching of input pairs will cause a reversal of input bias currents. Also, slight differences in offset voltage may be noted between the NPN and PNP pairs. Cross–coupling techniques have been used to keep this change to a minimum. In addition to the rail–to–rail performance, the output stage is current boosted to provide enough output current to drive 600 Ω loads. Because of this high current capability, care should be taken not to exceed the 150 °C maximum junction temperature specification. |
Số phần tương tự - MC33304 |
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Mô tả tương tự - MC33304 |
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