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OP162GP Datasheet(PDF) 9 Page - Analog Devices |
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OP162GP Datasheet(HTML) 9 Page - Analog Devices |
9 / 16 page –9– REV. D OP162/OP262/OP462 VCC. It is important to avoid accidentally connecting the wiper to VEE, as this will damage the device. The recommended value for the potentiometer is 20 k W. 6 7 4 1 2 3 8 –5V 20k OP162 +5V VOS Figure 28. Schematic Showing Offset Adjustment Rail-to-Rail Output The OP162/OP262/OP462 has a wide output voltage range that extends to within 60 mV of each supply rail with a load current of 5 mA. Decreasing the load current will extend the output voltage range even closer to the supply rails. The common- mode input range extends from ground to within 1 V of the positive supply. It is recommended that there be some minimal amount of gain when a rail-to-rail output swing is desired. The minimum gain required is based on the supply voltage and can be found as: A V, min = VS VS –1 where VS is the positive supply voltage. With a single supply voltage of +5 V, the minimum gain to achieve rail-to-rail output should be 1.25. Output Short-Circuit Protection To achieve a wide bandwidth and high slew rate, the output of the OP162/OP262/OP462 is not short-circuit protected. Short- ing the output directly to ground or to a supply rail may destroy the device. The typical maximum safe output current is ±30 mA. Steps should be taken to ensure the output of the device will not be forced to source or sink more than 30 mA. In applications where some output current protection is needed, but not at the expense of reduced output voltage headroom, a low value resistor in series with the output can be used. This is shown in Figure 29. The resistor is connected within the feed- back loop of the amplifier so that if VOUT is shorted to ground and VIN swings up to +5 V, the output current will not exceed 30 mA. For single +5 V supply applications, resistors less than 169 W are not recommended. OPx62 VIN 169 VOUT +5V Figure 29. Output Short-Circuit Protection APPLICATIONS SECTION Functional Description The OPx62 family is fabricated using Analog Devices’ high speed complementary bipolar process, also called XFCB. The process includes trench isolating each transistor to lower para- sitic capacitances thereby allowing high speed performance. This high speed process has been implemented without trading off the excellent transistor matching and overall dc performance characteristic of Analog Devices’ complementary bipolar pro- cess. This makes the OPx62 family an excellent choice as an extremely fast and accurate low voltage op amp. Figure 27 shows a simplified equivalent schematic for the OP162. A PNP differential pair is used at the input of the device. The cross connecting of the emitters is used to lower the transcon- ductance of the input stage, which improves the slew rate of the device. Lowering the transconductance through cross connect- ing the emitters has another advantage in that it provides a lower noise factor than if emitter degeneration resistors were used. The input stage can function with the base voltages taken all the way to the negative power supply, or up to within 1 V of the positive power supply. VCC VEE +IN –IN VOUT Figure 27. Simplified Schematic Two complementary transistors in a common-emitter configura- tion are used for the output stage. This allows the output of the device to swing to within 50 mV of either supply rail at load currents less than 1 mA. As load current increases, the maxi- mum voltage swing of the output will decrease. This is due to the collector-to-emitter saturation voltages of the output transis- tors increasing. The gain of the output stage, and consequently the open-loop gain of the amplifier, is dependent on the load resistance connected at the output. And because the dominant pole frequency is inversely proportional to the open-loop gain, the unity-gain bandwidth of the device is not affected by the load resistance. This is typically the case in rail-to-rail output devices. Offset Adjustment Because the OP162/OP262/OP462 has such an exceptionally low typical offset voltage, adjustment to correct offset voltage may not be needed. However, the OP162 does have pinouts where a nulling resistor can be attached. Figure 28 shows how the OP162 offset voltage can be adjusted by connecting a poten- tiometer between Pins 1 and 8, and connecting the wiper to |
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