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LT1113ACN8 Datasheet(PDF) 11 Page - Linear Technology |
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LT1113ACN8 Datasheet(HTML) 11 Page - Linear Technology |
11 / 16 page 11 LT1113 S APPLICATI I FOR ATIO resistor (RB) will reduce the IR errors due to IB by an order of magnitude. A further reduction of IR errors can be achieved by using a DC servo circuit shown in the applica- tions section of this data sheet. The DC servo has the advantage of reducing a wide range of IR errors to the millivolt level over a wide temperature variation. The preservation of dynamic range is especially important when reduced supplies are used, since input bias currents can exceed the nanoamp level for die temperatures over 85 °C. To take full advantage of a wide input common mode range, the LT1113 was designed to eliminate phase rever- sal. Referring to the photographs shown in Figure 3, the LT1113 is shown operating in the follower mode (AV = +1) at ±5V supplies with the input swinging ±5.2V. The output of the LT1113 clips cleanly and recovers with no phase reversal, unlike the competition as shown by the last photograph. This has the benefit of preventing lock-up in servo systems and minimizing distortion components. The effect of input and output overdrive on one amplifier has no effect on the other, as each amplifier is biased independently. Advantages of Matched Dual Op Amps In many applications the performance of a system depends on the matching between two operational ampli- fiers 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 in Figure 4 illustrates these concepts. Output offset is a function of the difference between the two halves of the LT1113. This error cancellation principle holds for a considerable number of input referred parameters in addition to offset voltage and bias current. 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. Common mode and power supply rejections will be dependent only on the match between the two amplifiers (assuming perfect resistor matching). INPUT: ±5.2V Sine Wave LT1113 Output OPA2111 Output Figure 3. Voltage Follower with Input Exceeding the Common-Mode Range ( VS = ±5V) |
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