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AD780BR датащи(PDF) 5 Page - Analog Devices |
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AD780BR датащи(HTML) 5 Page - Analog Devices |
5 / 10 page AD780 REV. B –5– NOISE PERFORMANCE The impressive noise performance of the AD780 can be further improved if desired by the addition of two capacitors: a load ca- pacitor C1 between the output and ground, and a compensation capacitor C2 between the TEMP pin and ground. Suitable val- ues are shown in Figure 3. 100 1 0.1 0.1 1 100 10 10 LOAD CAPACITOR, C1 – F Figure 3. 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 Figures 4, 5 and 6 following. 10 90 100 0% 100 V1s 0.1 TO 10Hz AMPLIFIER GAIN = 100 10 90 100 0% 20 V 10ms 10Hz TO 10kHz NO AMPLIFIER Figure 4. Stand-Alone Noise Performance NC TEMP +VIN VOUT TRIM GND O/P SELECT 2.5V – NC 3.0V – GND NC AD780 NC = NO CONNECT C2 1 F C1 Figure 5. Noise Reduction Circuit NOISE COMPARISON The wideband noise performance of the AD780 can also be ex- pressed in ppm. The typical performance with C1, C2 is 0.6 ppm and without external capacitors is 1.2 ppm. This performance is respectively 7 and 3 lower than the specified performance of the LT1019. 10 90 100 0% 20 V 10ms 10Hz TO 10kHz NO AMPLIFIER Figure 6. Reduced Noise Performance with C1 = 100 µF, C2 = 100 nF TEMPERATURE PERFORMANCE The AD780 provides superior performance over temperature by means of a combination of patented circuit design techniques, precision thin film resistors and drift trimming. Temperature performance is specified in terms of ppm/ °C, but because of nonlinearity in the temperature characteristic, the Box-Test method is used to test and specify the part. The nonlinearity takes the form of the characteristic S-shaped curve shown in Figure 7. The Box-Test method forms a rectangular box around this curve, enclosing the maximum and minimum output volt- ages over the specified temperature range. The specified drift is equal to the slope of the diagonal of this box. 2.0 –0.8 140 0.4 –0.4 –40 0 –60 1.6 0.8 1.2 120 100 80 60 40 20 0 –20 TEMPERATURE – C Figure 7. Typical AD780BN Temperature Drift |
Аналогичный номер детали - AD780BR |
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Аналогичное описание - AD780BR |
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