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AD707AR датащи(PDF) 6 Page - Analog Devices |
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AD707AR датащи(HTML) 6 Page - Analog Devices |
6 / 8 page AD707 REV. B –6– OPERATION WITH A GAIN OF 100 Demonstrating the outstanding dc precision of the AD707 in practical applications, Table I shows an error budget calculation for the gain of –100 configuration shown in Figure 21. Table I. Error Budget Maximum Error Contribution Av = 100 (C Grade) Error Source (Full Scale: VOUT = 10 V, VIN = 100 mV) VOS 15 µV/100 mV = 150 ppm IOS (100 Ω)(1 nA)/100 mV = 1 ppm Gain (2 k Ω Load) (100 V/8 × 106)100 mV = 13 ppm Noise 0.35 µV/100 mV = 4 ppm VOS Drift (0.1 V/ °C)/100 mV = 1 ppm/ °C = 168 ppm +1 ppm/ °C Total Unadjusted Error @ +25 °C = 168 ppm > 12 Bits @ –55 °C to +125°C = 268 ppm > 11 Bits With Offset Calibrated Out @ +25 °C = 17 ppm > 15 Bits @ –55 °C to +125°C = 117 ppm > 13 Bits 6 2 3 +VS AD707 0.1µF –VS 4 99 Ω VOUT 0.1µF 7 VIN 10k Ω 100 Ω Figure 21. Gain of –100 Configuration Although the initial offset voltage of the AD707 is very low, it is nonetheless the major contributor to system error. In cases requiring additional accuracy, the circuit shown in Figure 19 can be used to null out the initial offset voltage. This method will also cancel the effects of input offset current error. With the offsets nulled, the AD707C will add less than 17 ppm of error. This error budget assumes no error in the resistor ratio and no errors from power supply variation (the 120 dB minimum PSRR of the AD707C makes this a good assumption). The external resistors can cause gain error from mismatch and drift over temperature. OFFSET NULLING The input offset voltage of the AD707 is the lowest available in a bipolar op amp, but if additional nulling is required, the circuit shown in Figure 19 offers a null range of 200 µV. For wider null capability, omit R1 and substitute a 20 k Ω potenti- ometer for R2. 6 2 3 8 R2 2k Ω 1 R1 10k Ω 0.1µF +VS 7 AD707 0.1µF –VS 4 OFFSET ADJUST Figure 19. External Offset Nulling and Power Supply Bypassing GAIN LINEARITY INTO A 1 k Ω LOAD The gain and gain linearity of the AD707 are the highest available among monolithic bipolar amplifiers. Unlike other dc precision amplifiers, the AD707 shows no degradation in gain or gain linearity when driving loads in excess of 1 k Ω over a ±10 V output swing. This means high gain accuracy is assured over the output range. Figure 20 shows the gain of the AD707, OP07, and the OP77 amplifiers when driving a 1 k Ω load. The AD707 will drive 10 mA of output current with no signifi- cant effect on its gain or linearity. OUTPUT VOLTAGE – V –15 15 –10 –5 0 5 10 AD707 OP07 OP77 @ +25 °C RLOAD = 1kΩ Figure 20. Gain Linearity of the AD707 vs. Other DC Precision Op Amps |
Аналогичный номер детали - AD707AR |
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Аналогичное описание - AD707AR |
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