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AD780ARZ Datasheet(PDF) 6 Page - Analog Devices |
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AD780ARZ Datasheet(HTML) 6 Page - Analog Devices |
6 / 12 page AD780 Data Sheet Rev. F | Page 6 of 12 APPLYING THE AD780 The AD780 can be used without any external components to achieve specified performance. If power is supplied to Pin 2 and Pin 4 is grounded, Pin 6 provides a 2.5 V or 3.0 V output depending on whether Pin 8 is left unconnected or grounded. A bypass capacitor of 1 µF (+VIN to GND) should be used if the load capacitance in the application is expected to be greater than 1 nF. The AD780 in 2.5 V mode typically draws 700 µA of Iq at 5 V. This increases by ~2 µA/V up to 36 V. NC TEMP +VIN RNULL VOUT TRIM GND O/P SELECT 2.5V – NC 3.0V – GND NC R POT 1 µF AD780 NC = NO CONNECT 1 7 6 5 8 4 2 3 Figure 5. Optional Fine-Trim Circuit Initial error can be nulled using a single 25 kΩ potentiometer connected between VOUT, TRIM, and GND. This is a coarse trim with an adjustment range of 4%, and is only included here for compatibility purposes with other references. A fine trim can be implemented by inserting a large value resistor (e.g., 1 MΩ to 5 MΩ) in series with the wiper of the potentiometer (see Figure 5). The trim range, expressed as a fraction of the output, is simply greater than or equal to 2.1 kΩ/RNULL for either the 2.5 V or 3.0 V mode. The external null resistor affects the overall temperature coefficient by a factor equal to the percentage of VOUT nulled. For example, a 1 mV (0.03%) shift in the output caused by the trim circuit, with a 100 ppm/°C null resistor, adds less than 0.06 ppm/°C to the output drift (0.03% × 200 ppm/°C, since the resistors internal to the AD780 also have temperature coefficients of less than 100 ppm/°C). NOISE PERFORMANCE The impressive noise performance of the AD780 can be further improved, if desired, by adding two capacitors: a load capacitor (C1) between the output and ground, and a compensation capacitor (C2) between the TEMP pin and ground. Suitable values are shown in Figure 6. 100 10 1 0.1 0.1 1 10 100 LOAD CAPACITOR, C1 ( µF) Figure 6. Compensation and Load Capacitor Combinations C1 and C2 also improve the settling performance of the AD780 when subjected to load transients. The improvement in noise performance is shown in Figure 7, Figure 8, Figure 9, and Figure 10. 0.1 TO 10Hz AMPLIFIER GAIN = 100 1s 100 µV 100 90 10 0% Figure 7. Standalone Noise Performance 10Hz TO 10kHz NO AMPLIFIER 10ms 20 µV 100 90 10 0% Figure 8. Standalone Noise Performance |
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