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LT1124AIS8 Datasheet(PDF) 8 Page - Linear Technology |
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LT1124AIS8 Datasheet(HTML) 8 Page - Linear Technology |
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8 / 16 page  8 LT1124/LT1125 S APPLICATI I FOR ATIO The LT1124 may be inserted directly into OP-270 sockets. The LT1125 plugs into OP-470 sockets. Of course, all standard dual and quad bipolar op amps can also be replaced by these devices. Matching Specifications In many applications the performance of a system de- pends on the matching between two op amps, rather than the individual characteristics of the two devices. The three op amp instrumentation amplifier configuration shown in this data sheet is an example. Matching characteristics are not 100% tested on the LT1124/LT1125. Some specifications are guaranteed by definition. For example, 70 µV maximum offset voltage implies that mis- match cannot be more than 140 µV. 112dB (= 2.5µV/V) CMRR means that worst case CMRR match is 106dB Table 1. Expected Match LT1124AC/AM LT1124C/M LT1125AC/AM LT1125C/M PARAMETER 50% YIELD 98% YIELD 50% YIELD 98% YIELD UNITS VOS Match, ∆VOS LT1124 20 110 30 130 µV LT1125 30 150 50 180 µV Temperature Coefficient Match 0.35 1.0 0.5 1.5 µV/°C Average Noninverting IB 618 7 25 nA Match of Noninverting IB 722 8 30 nA CMRR Match 126 115 123 112 dB PSRR Match 127 118 127 114 dB Figure 1. Test Circuit for Offset Voltage and Offset Voltage Drift with Temperature – + 100 Ω* 50k* 50k* 15V –15V VOUT VOUT = 1000VOS *RESISTORS MUST HAVE LOW THERMOELECTRIC POTENTIAL 1124/25 F01 (5 µV/V). However, Table 1 can be used to estimate the expected matching performance between the two sides of the LT1124, and between amplifiers A and D, and between amplifiers B and C of the LT1125. 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 in Figure 1 to measure offset voltage is also used as the burn-in configuration for the LT1124/ LT1125, with the supply voltages increased to ±16V. |
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