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LT1007AMH Datasheet(PDF) 9 Page - Linear Technology |
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LT1007AMH Datasheet(HTML) 9 Page - Linear Technology |
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9 / 16 page  9 LT1007/LT1037 sn100737 100737fbs APPLICATIONS INFORMATION General The LT1007/LT1037 series devices may be inserted directly into OP-07, OP-27, OP-37 and 5534 sockets with or without removal of external compensation or nulling components. In addition, the LT1007/LT1037 may be fitted to 741 sockets with the removal or modification of external nulling components. Offset Voltage Adjustment The input offset voltage of the LT1007/LT1037 and its drift with temperature, are permanently trimmed at wafer testing to a low level. However, if further adjustment of VOS is necessary, the use of a 10kΩ nulling 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 (Figure 1). The adjustment range with a 10k Ω pot is approximately ±2.5mV.Iflessadjustmentrangeisneeded,thesensitivity and resolution of the nulling can be improved by using a smaller pot in conjunction with fixed resistors. The ex- ample has an approximate null range of ±200µV (Figure 2). Offset Voltage and Drift Thermocouple effects, caused by temperature gradients across dissimilar metals at the contacts to the input terminals, can exceed the inherent drift of the amplifier unless proper care is exercised. Air currents should be minimized, package leads should be short, the two input leads should be close together and maintained at the same temperature. The circuit shown to measure offset voltage is also used as the burn-in configuration for the LT1007/LT1037, with the supply voltages increased to ±20V (Figure 3). Figure 2. Improved Sensitivity Adjustment 1007/37 F02 1k 4.7k OUTPUT 8 7 6 4 1 2 3 15V –15V LT1007 LT1037 4.7k 1007/37 F01 10k OUTPUT INPUT 8 7 6 4 1 2 3 15V –15V LT1007 LT1037 Figure 1. Standard Adjustment Unity-Gain Buffer Application (LT1007 Only) When RF ≤ 100Ω and the input is driven with a fast, large- signal pulse (>1V), the output waveform will look as shown in the pulsed operation diagram (Figure 4). During the fast feedthrough-like portion of the output, the input protection diodes effectively short the output to the input and a current, limited only by the output short-circuit protection, will be drawn by the signal generator. With RF ≥ 500Ω, the output is capable of handling the current requirements (IL ≤ 20mA at 10V) and the amplifier stays in its active mode and a smooth transition will occur. 1007/37 F04 LT1007 RF OUTPUT 2.8V/ µs Figure 4. Pulsed Operation 1007/37 F03 VOUT VOUT = 1000VOS *RESISTORS MUST HAVE LOW THERMOELECTRIC POTENTIAL 7 6 4 2 3 15V –15V LT1007 LT1037 50k* 100 Ω* 50k* Figure 3. Test Circuit for Offset Voltage and Offset Voltage Drift with Temperature |
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