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LT1996IMS Datasheet(PDF) 8 Page - Linear Technology |
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LT1996IMS Datasheet(HTML) 8 Page - Linear Technology |
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8 / 24 page  LT1996 8 1996f Introduction The LT1996 may be the last op amp you ever have to stock. Because it provides you with several precision matched resistors, you can easily configure it into several different classical gain circuits without adding external compo- nents. The several pages of simple circuits in this data sheet demonstrate just how easy the LT1996 is to use. It can be configured into difference amplifiers, as well as into inverting and noninverting single ended amplifiers. The fact that the resistors and op amp are provided together in such a small package will often save you board space and reduce complexity for easy probing. The Op Amp The op amp internal to the LT1996 is a precision device with 15µV typical offset voltage and 3nA input bias cur- rent. The input offset current is extremely low, so match- ing the source resistance seen by the op amp inputs will provide for the best output accuracy. The op amp inputs are not rail-to-rail, but extend to within 1.2V of VCC and 1V of VEE. For many configurations though, the chip inputs will function rail-to-rail because of effective attenuation to the +input. The output is truly rail-to-rail, getting to within 40mV of the supply rails. The gain bandwidth product of the op amp is about 560kHz. In noise gains of 2 or more, it is stable into capacitive loads up to 500pF. In noise gains below 2, it is stable into capacitive loads up to 100pF. The Resistors The resistors internal to the LT1996 are very well matched SiChrome based elements protected with barrier metal. Although their absolute tolerance is fairly poor (±30%), their matching is to within 0.05%. This allows the chip to achieve a CMRR of 80dB, and gain errors within 0.05%. The resistor values are (450k/9), (450k/27), (450k/81) and 450k, connected to each of the inputs. The resistors have power limitations of 1watt for the 450k and (450k/81) resistors, 0.3watt for the (450k/27) resistors and 0.5watt for the (450k/9) resistors; however, in practice, power dissipation will be limited well below these values by the BLOCK DIAGRA LT1996 1996 BD 9 8 2 3 4 5 7 6 10 1 M9 M27 M81 P9 P27 P81 VCC VEE OUT REF 450k/81 450k/27 450k/27 450k/9 450k/9 450k 4pF 450k 450k/81 4pF + – OUT APPLICATIO S I FOR ATIO |
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