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AD1585BRT-REEL7 bảng dữ liệu(PDF) 11 Page - Analog Devices

tên linh kiện AD1585BRT-REEL7
Giải thích chi tiết về linh kiện  2.5 V to 5.0 V Micropower, Precision Series Mode Voltage References
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AD1585BRT-REEL7 bảng dữ liệu(HTML) 11 Page - Analog Devices

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AD1582/AD1583/AD1584/AD1585
–11–
REV. D
AC PERFORMANCE
To apply the AD1582/AD1583/AD1584/AD1585 family of
references, it is important to understand the effects of dynamic
output impedance and power supply rejection. In Figure 8a, a
voltage divider is formed by the AD1582’s output impedance and
by the external source impedance. Figure 8b shows the effect of
varying the load capacitor on the reference output. Power supply
rejection ratio (PSRR) should be determined when characterizing
the ac performance of a series voltage reference. Figure 9a shows a
test circuit used to measure PSRR, and Figure 9b demonstrates
the AD1582’s ability to attenuate line voltage ripple.
2
VOUT
10k
10k
2V
100 A
10k
2k
VLOAD DC
5V
5 F
1 F
DUT
1
Figure 8a. Output Impedance Test Circuit
100
1
0.1
10
FREQUENCY (Hz)
10
100
1k
10k
100k
1M
1 F CAP
AD1585
AD1582
Figure 8b. Output Impedance vs. Frequency
5V
100mV
0.22 F
DUT
0.22 F
VOUT
10V
10k
10k
200mV
1
Figure 9a. Ripple Rejection Test Circuit
FREQUENCY (Hz)
100
90
0
11M
10
100
1k
10k
100k
50
20
80
70
60
40
30
10
AD1582
AD1585
Figure 9b. Ripple Rejection vs. Frequency
NOISE PERFORMANCE AND REDUCTION
The noise generated by the AD1582 is typically less than
70
µV p-p over the 0.1 Hz to 10 Hz frequency band. Figure 10
shows the 0.1 Hz to 10 Hz noise of a typical AD1582. The noise
measurement is made with a high gain band-pass filter. Noise in
a 10 Hz to 10 kHz region is approximately 50
µV rms. Figure 11
shows the broadband noise of a typical AD1582. If further noise
reduction is desired, a 1-pole low-pass filter may be added
between the output pin and the ground. A time constant of 0.2 ms
has a –3 dB point at roughly 800 Hz, and reduces the high
frequency noise to about 16
µV rms. It should be noted,
however, that while additional filtering on the output may improve
the noise performance of the AD1582/AD1583/AD1584/AD1585
family, the added output impedance could degrade the ac
performance of the references.
100
90
10
0%
10 V
1s
Figure 10. 0.1 Hz to 10 Hz Voltage Noise
10
0%
100
90
10ms
100 V
Figure 11. 10 Hz to 10 kHz Wideband Noise


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