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MAX44251 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX44251 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 15 page ���������������������������������������������������������������� Maxim Integrated Products 11 MAX44251/MAX44252 20V, Ultra-Precision, Low-Noise Op Amps Error Budget Example When using the ICs as an ADC buffer in strain gauge application, the temperature drift should be taken into consideration to determine maximum input signal. A typical strain gauge has sensitivity specification of just 2mV/V at rated out load. This means that when the strain gauge load cell is powered with 10V, the full-scale output voltage is 20mV. In this application, both offset voltage and drift are critical parameters that directly affect the accuracy of measurement. Even though offset voltage could be calibrated out, its drift over temperature is still a problem. The ICs, with a typical offset drift of 5nV/°C, guarantee that the drift over a 10°C range is only 50nV. Setting this equal to 0.5 LSB in a 18-bit system yields a full-scale range of 13mV. With a single 10V supply, an acceptable closed-loop gain of 770V/V provides sufficient gain while maintaining headroom. Precision Low-Side Current Sensing The ICs’ autozero feature produces ultra-low offset voltage and drift, making them ideal for precision cur- rent-sensing applications. Figure 2 shows the ICs in a low-side current-sense configuration. This circuit pro- duces an accurate output voltage, VOUT equal to ILOAD x RSENSE x R2/R1. Figure 2. Low-Side Current Sensing Ordering Information +Denotes a lead(Pb)-free/RoHS-compliant package. *Future product—contact factory for availability. Chip Information PROCESS: BiCMOS Functional Diagrams PART TEMP RANGE PIN- PACKAGE TOP MARK MAX44251AKA+ -40NC to +125NC 8 SOT23 AERC MAX44251AUA+ -40NC to +125NC 8 FMAX — MAX44252ASD+* -40NC to +125NC 14 SOIC — VSUPPLY OUT ILOAD RSENSE R1 R2 MAX44251 MAX44252 5 6 7 10 9 8 INB- INB+ VSS 1 2 8 7 VDD OUTB INA- INA+ OUTA TOP VIEW 3 4 6 5 MAX44251 + IND+ VSS VDD INB+ 1 2 14 13 OUTD IND- INA- INA+ INB- OUTB OUTA 3 4 12 11 INC+ INC- OUTC MAX44252 + |
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