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LT1002MJ Datasheet(PDF) 8 Page - Linear Technology |
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LT1002MJ Datasheet(HTML) 8 Page - Linear Technology |
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8 / 16 page  8 LT1002 TYPICAL PERFORMANCE CHARACTERISTICS LOAD RESISTANCE ( Ω) 100 300 16 12 8 4 0 1000 3k 10k 1002 G28 VS = ±15V TA = 25°C POSITIVE SWING NEGATIVE SWING TIME FROM OUTPUT SHORT (MINUTES) 0 2 50 40 30 20 10 –10 –20 –30 –40 –50 1002 G29 13 4 –55 °C –55 °C 25 °C 25 °C 125 °C 125 °C VS = ±15V Output Short Circuit Current vs Time Output Swing vs. Load Resistance APPLICATIONS INFORMATION The LT1002 dual amplifier may be inserted directly into OP-10, OP207, OP227 sockets with or without removal of external nulling potentiometers. Offset Voltage Adjustment The input offset voltage of the LT1002, and its drift with temperature, are permanently trimmed at wafer testing to a low level. However, if further adjustment of VOS is necessary, nulling with a 10k or 20k potentiometer will not degrade drift with temperature. Trimming to a value other than zero creates a drift of (VOS/ 300) µV/°C, e.g. if VOS is adjusted to 300µV, the change in drift will be 1 µV/°C. The adjustment range with a 10k or 20k pot is approximately ±2.5mV. If less adjustment range is needed, the sensitivity and resolution of the nulling can be improved by using a smaller pot in conjunc- tion with fixed resistors. The example has an approximate null range of ±100µV. In matching applications, both amplifiers can be trimmed to zero, or the offset of one amplifier can be trimmed to match the offset of the other. Offset adjustment, however, slightly degrades the gain, common-mode and power- supply rejection match between the two op amps. Fortu- nately, the guaranteed offset voltage match of the LT1002 is very low, in most applications offset adjustment will be unnecessary. Improved Sensitivity Adjustment Standard Adjustment –15V 1/2 LT1002 +15V 3 (10) (11) 4 (9) (8) 13 (6) 14 (7) OUTPUT INPUT 1002 TA03 12 (5) 2 10k or 20k 1 –15V 1 /2 LT1002 +15V 3 (10) (11) 4 (9) (8) 13 (6) 14 OUTPUT INPUT 1002 TA04 12 (5) 2 1k 7.5k 7.5k 1 (7) |
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