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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ADA4522-4ARUZ-R7 датащи(PDF) 42 Page - Analog Devices |
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ADA4522-4ARUZ-R7 датащи(HTML) 42 Page - Analog Devices |
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42 / 48 page  Data Sheet ADA4522-1/ADA4522- 2/ADA4522-4 analog.com Rev I 42 of 48 Figure 88.Supply Current (ISY) per Dual Amplifier vs. Supply Voltage (VSY) (ADA4522-1/ADA4522-2/ADA4522-4 as a Comparator) Note that 10 kΩ resistors are used in series with the input of the op amp. If smaller resistor values are used, the supply current of the system increases much more. For more details on op amps as comparators, see the AN-849 Application Note , Using Op Amps as Comparators. Use of Large Source Resistance The ADA4522-1/ADA4522-2/ADA4522-4 are designed to work with low value source resistance. Note that the amplifier has an ultralow voltage noise density of 6 nV/√Hz. A 1 kΩ resistor contributes 4 nV/√Hz; therefore, placing a 1 kΩ resistor at the input increases total noise to 7.2 nV/√Hz. For this noise reason, it is recommended to avoid using large source resistance. Unity Gain Follower with Large Source Resistance When the ADA4522-1/ADA4522-2/ADA4522-4 are configured in a unity-gain follower configuration with a large source resistance and slow power supply ramp rate, the amplifier output may rail to the positive supply. Figure 89.Insert RF When Large RS is Use Workaround To avoid the amplifier output railing to the positive supply, implement one of the following actions (see Table 11 and Figure 89): Reduce the value of the source resistance (RS). Insert a feedback resistor (RF). 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0 6 12 18 24 30 4 10 16 22 28 2 8 14 20 26 VSY (V) ISY+ ISY– ADA4522-1/ ADA4522-2/ ADA4522-4 +VSY RF RS VOUT –VSY VIN |
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