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AD780BNZ 数据表(PDF) 7 Page - Analog Devices |
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AD780BNZ 数据表(HTML) 7 Page - Analog Devices |
7 / 12 page Data Sheet AD780 Rev. F | Page 7 of 12 NC TEMP +VIN VOUT TRIM GND O/P SELECT 2.5V – NC 3.0V – GND NC 1 F AD780 NC = NO CONNECT 1 7 6 5 8 4 2 3 C2 C1 Figure 9. Noise Reduction Circuit NOISE COMPARISON The wideband noise performance of the AD780 can also be expressed in ppm. The typical performance with C1 and C2 is 0.6 ppm; without external capacitors, typical performance is 1.2 ppm. This performance is, respectively, 7× and 3× lower than the specified performance of the LT1019. 10Hz TO 10kHz NO AMPLIFIER 10ms 20 V 100 90 10 0% Figure 10. 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; 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 11. The box test method forms a rectangular box around this curve, enclosing the maximum and minimum output voltages over the specified temperature range. The specified drift is equal to the slope of the diagonal of this box. 2.0 –0.8 –0.4 0 0.4 0.8 1.2 1.6 –60 –40 –20 0 20 40 60 80 100 120 140 TEMPERATURE ( C) Figure 11. Typical AD780BN Temperature Drift TEMPERATURE OUTPUT PIN The AD780 provides a TEMP output (Pin 3) that varies linearly with temperature. This output can be used to monitor changes in system ambient temperature, and to initiate calibration of the system, if desired. The voltage VTEMP is 560 mV at 25°C, and the temperature coefficient is approximately 2 mV/°C. Figure 12 shows the typical VTEMP characteristic curve over temperature taken at the output of the op amp with a noninverting gain of 5. 4.25 4.00 3.75 3.50 3.25 3.00 2.75 2.50 2.25 2.00 –75 –50 –25 0 25 50 75 100 125 150 TEMPERATURE ( C) CIRCUIT CALIBRATED AT 25 C REFER TO FIGURE 13 10mV PER C Figure 12. Temperature Pin Transfer Characteristic Since the TEMP voltage is acquired from the band gap core circuit, current pulled from this pin has a significant effect on VOUT. Care must be taken to buffer the TEMP output with a suitable op amp, e.g., an OP07, AD820, or AD711 (all of which would result in less than a 100 μV change in VOUT). The relationship between ITEMP and VOUT is ΔVOUT = 5.8 mV/μA ITEMP (2.5 V Range) or ΔVOUT = 6.9 mV/μA ITEMP (3.0 V Range) |
类似零件编号 - AD780BNZ |
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类似说明 - AD780BNZ |
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