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LMC2001AIMX Datasheet(PDF) 7 Page - National Semiconductor (TI) |
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LMC2001AIMX Datasheet(HTML) 7 Page - National Semiconductor (TI) |
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7 / 11 page  Application Notes (Continued) This Strain-Gauge ( Figure 4) amplifier provides high gain (1006 or 60 dB) with very low offset and drift. Using the resis- tors tolerance as shown, the worst case CMRR will be greater than 90 dB. The common-mode gain is directly re- lated to the resistor mismatch and is independent of the dif- ferential gain that is set by R3. The worst case common- mode gain is −54 dB. This gain becomes even lower, improving CMRR, if the resistor ratio matching is improved. 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 (pin numbers shown are for SO-8 package). These configurations utilize the excellent DC performance of the LMC2001 while at the same time allow the superior voltage and frequency capabili- ties of the LM6171 to set the dynamic performance of the overall amplifier. For example, it is possible to achieve ±12V output swing with 300MHz of overall GBW (Av=100) while keeping the worst case output shift due to Vos less than 4mV. The LMC2001 output voltage is kept at about mid-point of it’s overall supply voltage and it’s 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 op- eration). Higher closed loop gains are also possible with a corresponding reduction in realizable bandwidth. Table 1 shows some other closed loop gain possibilities along with the measured performance in each case Application Circuits DS100058-A1 FIGURE 2. DS100058-A0 FIGURE 3. DS100058-21 FIGURE 4. Single Supply Strain- Gauge Amplifier DS100058-30 FIGURE 5. Inverting Composite Amplifier www.national.com 7 |
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