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LMP2014MT Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LMP2014MT Datasheet(HTML) 11 Page - National Semiconductor (TI) |
11 / 16 page Application Information (Continued) INPUT CURRENTS The LMP201X’s input currents are different than standard bipolar or CMOS input currents in that it appears as a current flowing in one input and out the other. Under most operating conditions, these currents are in the picoamp level and will have little or no effect in most circuits. These currents tend to increase slightly when the common-mode voltage is near the minus supply. (See the typical curves.) At high temperatures such as 85˚C, the input currents become larger, 0.5 nA typical, and are both positive except when the V CM is near V −. If operation is expected at low common-mode voltages and high temperature, do not add resistance in series with the inputs to balance the impedances. Doing this can cause an increase in offset voltage. A small resistance such as 1 k Ω can provide some protection against very large transients or overloads, and will not increase the offset significantly. PRECISION STRAIN-GAUGE AMPLIFIER This Strain-Gauge amplifier (Figure 4) provides high gain (1006 or ~60 dB) with very low offset and drift. Using the resistors’ tolerances as shown, the worst case CMRR will be greater than 108 dB. The CMRR is directly related to the resistor mismatch. The rejection of common-mode error, at the output, is independent of the differential gain, which is set by R3. The CMRR is further improved, if the resistor ratio matching is improved, by specifying tighter-tolerance resis- tors, or by trimming. Extending Supply Voltages and Output Swing by Using a Composite Amplifier Configuration: In cases where substantially higher output swing is required with higher supply voltages, arrangements like the ones shown in Figure 5 and Figure 6 could be used. These configurations utilize the excellent DC performance of the LMP201X while at the same time allow the superior voltage and frequency capabilities of the LM6171 to set the dynamic performance of the overall amplifier. For example, it is pos- sible to achieve ±12V output swing with 300 MHz of overall GBW (A V = 100) while keeping the worst case output shift due to V OS less than 4 mV. The LMP201X output voltage is kept at about mid-point of its overall supply voltage, and its input common mode voltage range allows the V- terminal to be grounded in one case (Figure 5, inverting operation) and tied to a small non-critical negative bias in another (Figure 6, non-inverting operation). Higher closed-loop gains are also possible with a corresponding reduction in realizable band- width. Table 1 shows some other closed loop gain possibili- ties along with the measured performance in each case. 20071517 FIGURE 2. 20071504 FIGURE 3. 20071518 FIGURE 4. www.national.com 11 |
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