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LMP2012MDE Datasheet(PDF) 9 Page - Texas Instruments |
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LMP2012MDE Datasheet(HTML) 9 Page - Texas Instruments |
9 / 13 page C4 0.01 PF 1N4733A (5.1V) D1 7 2 6 4 3 - + R1 R7, 3.9k R2 C2 3 2 6 7 4 LMP201X U1 LM6171 U2 - + R5, 1M (+2.5V) Output +15V R4 3.9k R3 20k C3 0.01 PF +15V -15V Input + - + - VOUT 5V R1 R2 R2 R1 10k, 0.1% 2k, 1% 2k, 1% 10k, 0.1% R3 20: LMP2012QML www.ti.com SNOSAU5H – MARCH 2007 – REVISED APRIL 2013 PRECISION STRAIN-GAUGE AMPLIFIER This Strain-Gauge amplifier (Figure 5) 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 resistors, or by trimming. Figure 5. 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 6 and Figure 7 could be used. These configurations utilize the excellent DC performance of the LMP2012 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 possible to achieve ±12V output swing with 300 MHz of overall GBW (AV = 100) while keeping the worst case output shift due to VOS less than 4 mV. The LMP2012 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 6, inverting operation) and tied to a small non-critical negative bias in another (Figure 7, non-inverting operation). Higher closed-loop gains are also possible with a corresponding reduction in realizable bandwidth. Table 2 shows some other closed loop gain possibilities along with the measured performance in each case. Figure 6. Copyright © 2007–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LMP2012QML |
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