전자부품 데이터시트 검색엔진 |
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AD588AQ 데이터시트(PDF) 6 Page - Analog Devices |
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AD588AQ 데이터시트(HTML) 6 Page - Analog Devices |
6 / 12 page REV. D –6– AD588 R3 RB R1 R2 R4 R5 R6 –VS +VS A1 A4 AD588 A3 A2 SYSTEM GROUND +15V –10V –15V SYSTEM GROUND 0.1 F 0.1 F NOISE REDUCTION –5V 0.1 F 0.1 F Figure 2c. –10 V Output Trimming the AD588 introduces no additional errors over temperature, so precision potentiometers are not required. For single-output voltage ranges, or in cases when BALANCE ADJUST is not required, Pin 12 should be connected to Pin 11. If GAIN ADJUST is not required, Pin 5 should be left floating. NOISE PERFORMANCE AND REDUCTION The noise generated by the AD588 is typically less than 6 µV p-p over the 0.1 Hz to 10 Hz band. Noise in a 1 MHz bandwidth is approximately 600 µV p-p. The dominant source of this noise is the buried Zener, which contributes approximately 100 nV/ √Hz. In comparison, the op amp’s contribution is negligible. Figure 3 shows the 0.1 Hz to 10 Hz noise of a typical AD588. Figure 3. 0.1 Hz to 10 Hz Noise (0.1 Hz to 10 Hz BPF with Gain of 1000 Applied) If further noise reduction is desired, an optional capacitor, CN, may be added between the NOISE REDUCTION pin and ground, as shown in Figure 2b. This will form a low-pass filter with the 4 k Ω R B on the output of the Zener cell. A 1 µF capacitor will have a 3 dB point at 40 Hz and will reduce the high frequency (to 1 MHz) noise to about 200 µV p-p. Figure 4 shows the 1 MHz noise of a typical AD588 both with and without a 1 µF capacitor. Note that a second capacitor is needed in order to implement the NOISE REDUCTION feature when using the AD588 in the –10 V mode (Figure 2c.). The NOISE REDUCTION capaci- tor is limited to 0.1 µF maximum in this mode. Figure 4. Effect of 1 µF Noise Reduction Capacitor on Broadband Noise TURN-ON TIME Upon application of power (cold start), the time required for the output voltage to reach its final value within a specified error band is the turn-on settling time. Two components normally associated with this are: time for active circuits to settle and time for thermal gradients on the chip to stabilize. Figures 5a and 5b show the turn-on characteristics of the AD588. It shows the settling to be about 600 µs. Note the absence of any thermal tails when the horizontal scale is expanded to 2 ms/cm in Figure 5b. Figure 5a. Electrical Turn-On Figure 5b. Extended Time Scale Turn-On Output turn-on time is modified when an external noise reduc- tion capacitor is used. When present, this capacitor presents an |
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