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AD1582BRT-R2 View Datasheet(PDF) - Analog Devices

Part NameDescriptionManufacturer
AD1582BRT-R2 2.5 V to 5.0 V Micropower, Precision Series Mode Voltage References ADI
Analog Devices ADI
AD1582BRT-R2 Datasheet PDF : 16 Pages
First Prev 11 12 13 14 15 16
AD1582/AD1583/AD1584/AD1585
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.
VLOAD DC 5V
10k
2k
2 ؋ VOUT
10k
؋1
DUT
5F
؎2V 10k
؎100A
1F
Figure 8a. Output Impedance Test Circuit
100
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.
10V
1s
100
90
1F CAP
10
AD1585
AD1582
1
0.1
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
Figure 8b. Output Impedance vs. Frequency
10k
10V
10k
؎200mV
؋1
0.22F
5V ؎100mV
DUT
VOUT
0.22F
Figure 9a. Ripple Rejection Test Circuit
100
90
80
70
AD1582
60
50
AD1585
40
30
20
10
0
1
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
Figure 9b. Ripple Rejection vs. Frequency
REV. D
10
0%
Figure 10. 0.1 Hz to 10 Hz Voltage Noise
100V
100
90
10ms
10
0%
Figure 11. 10 Hz to 10 kHz Wideband Noise
–11–
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