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LT1112CN8 Datasheet(PDF) 10 Page - Linear Integrated Systems |
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LT1112CN8 Datasheet(HTML) 10 Page - Linear Integrated Systems |
10 / 16 page 10 LT1112/LT1114 111214fb Voltage Follower with Input Exceeding the Common Mode Range (VS = ±5V) INPUT: ±5.2V Sine Wave LT1112 Output OP-297 Output The LT1112 dual and LT1114 quad in the plastic and ceramic DIP packages are pin compatible to and directly replace such precision op amps as the OP-200, OP-297, AD706 duals and OP-400, OP-497, AD704 quads with improved price/performance. The LT1112 in the S8 surface mount package has the standard pin configuration, i.e., the same configuration as the plastic and ceramic DIP packages. The LT1114 quad is offered in the narrow 16-pin surface mount package. All competitors are in the wide 16-pin package which occupies 1.8 times the area of the narrow package. The wide package is also 1.8 times thicker than the narrow package. The inputs of the LT1112/1114 are protected with back-to- back diodes. In the voltage follower configuration, when the input is driven by a fast large-signal pulse (>1V), the input protection diodes effectively short the output to the input during slewing, and a current, limited only by the output short-circuit protection, will flow through the diodes. The use of a feedback resistor is recommended because this resistor keeps the current below the short-circuit limit, resulting in faster recovery and settling of the output. The input voltage of the LT1112/1114 should never ex- ceed the supply voltages by more than a diode drop. However, the example below shows that as the input voltage exceeds the common mode range, the LT1112’s output clips cleanly, without any glitches or phase rever- sal. The OP-297 exhibits phase reversal. The photos also illustrate that both the input and output ranges of the LT1112 are within 800mV of the supplies. The effect of input and output overdrive on the other amplifiers in the LT1112 or LT1114 packages is negligible, as each amplifier is biased independently. Advantages of Matched Dual and Quad Op Amps In many applications the performance of a system de- pends on the matching between two operational amplifiers rather than the individual characteristics of the two op amps. Two or three op amp instrumentation amplifiers, tracking voltage references and low drift active filters are some of the circuits requiring matching between two op amps. The well-known triple op amp configuration illustrates these concepts. Output offset is a function of the difference between the offsets of the two halves of the LT1112. This error cancellation principle holds for a considerable num- ber of input referred parameters in addition to offset voltage and its drift with temperature. Input bias current will be the average of the two noninverting input currents (IB+). The difference between these two currents (∆IB+) is the offset current of the instrumentation amplifier. Com- mon mode and power supply rejections will be dependent only on the match between the two amplifiers (assuming perfect resistor matching). APPLICATIO S I FOR ATIO |
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