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LT1002CJ Datasheet(PDF) 9 Page - Linear Technology |
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LT1002CJ Datasheet(HTML) 9 Page - Linear Technology |
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9 / 16 page  9 LT1002 APPLICATIONS INFORMATION Test Circuit for Offset Voltage and its Drift with Temperature –15V +15V *50k * 100 Ω * 50k 3 (10) (11) 4 14 (7) 13 (6) VO 1002 TA05 VO = 1000 VOS *RESISTORS MUST HAVE LOW THERMOELECTRIC POTENTIAL. 12 (5) 1/2 LT1002 0.1Hz to 10Hz Noise Test Circuit The device under test should be warmed up for three minutes and shielded from air currents. Turn the device 180 ° to measure the noise of side B. – + 100k Ω 2k Ω 100k 4.3k 110k SCOPE × 1 RIN = 1MΩ 0.1 µF 4.7 µF 24.3k 10 Ω 1002 TA06 0.1 µF 22 µF VOLTAGE GAIN = 50,000 2.2 µF DEVICE UNDER TEST 1/2 LT1002 A 1/2 LT1002 B (Peak to Peak noise measured in 10 Sec interval) This circuit is also used as burn-in configuration for the LT1002, with supply voltages increased to ±20V. Unless proper care is exercised, thermocouple effects, caused by temperature gradients across dissimilar metals at the contacts to the input terminals, can exceed the inherent drift of the amplifier. Air currents should be minimized, package leads should be short, the two input leads should be as close together as possible and main- tained at the same temperature. Channel Separation This parameter is defined as the ratio of the change in input offset voltage of one amplifier to the change in output voltage of the other amplifier causing the offset change. At low frequencies the LT1002’s channel separation is an almost unmeasurable 148dB. As frequency increases, pin to pin capacitance of the package, between the output of one amplifier and the inputs of the other, becomes domi- nant. Since these pins are non-adjacent, the capacitance is only 0.02pF. To maintain the LT1002’s excellent channel separation at higher frequencies, the socket and PC board capacitances should be minimized. Power supplies The LT1002 is specified over a wide range of power supply voltages from ±3V to±18V. Operation with lower supplies is possible, down to ±1.2V (two Ni-Cad batteries). How- ever, with ±1.2V supplies, the device is stable only in closed loop gains of + 2 or higher (or inverting gain of one or higher). The V+ supply terminals are completely independent and may be powered by separate supplies if desired (this approach, however, would sacrifice the advantages of the power supply rejection ratio matching). The V– supply terminals are both connected to the common substrate and must be tied to the same voltage. Both V – pins should be used. |
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