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ADR525 Scheda tecnica(PDF) 10 Page - Analog Devices

Il numero della parte ADR525
Spiegazioni elettronici  High Precision Shunt Mode Voltage References
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
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ADR525 Scheda tecnica(HTML) 10 Page - Analog Devices

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ADR525/ADR530/ADR550
Rev. F | Page 10 of 12
Stacking the ADR525/ADR530/ADR550 for
User-Definable Outputs
Multiple ADR525/ADR530/ADR550 parts can be stacked to
allow the user to obtain a desired higher voltage. Figure 18 shows
three ADR550s configured to give 15 V. The bias resistor, RBIAS, is
chosen using Equation 3; note that the same bias current flows
through all the shunt references in series. Figure 19 shows three
ADR550s stacked to give −15 V. RBIAS is calculated in the same
manner as for Figure 18. Parts of different voltages can also be
added together. For example, an ADR525 and an ADR550 can
be added together to give an output of +7.5 V or −7.5 V, as
desired. Note, however, that the initial accuracy error is now the
sum of the errors of all the stacked parts, as are the temperature
coefficients and output voltage change vs. input current.
ADR550
+VDD
+15V
R
ADR550
ADR550
GND
Figure 18. +15 V Output with Stacked ADR550s
ADR550
ADR550
ADR550
GND
–15V
R
–VDD
Figure 19. −15 V Output with Stacked ADR550s
Adjustable Precision Voltage Source
The ADR525/ADR530/ADR550, combined with a precision low
input bias op amp, such as the AD8610, can be used to output a
precise adjustable voltage. Figure 20 illustrates the implementation
of this application using the ADR525/ADR530/ADR550. The
output of the op amp, VOUT, is determined by the gain of the circuit,
which is completely dependent on the resistors, R1 and R2.
VOUT = VREF (1 + R2/R1)
An additional capacitor, C1, in parallel with R2, can be added to
filter out high frequency noise. The value of C1 is dependent on
the value of R2.
ADR5xx
VS
GND
R
R1
R2
C1
(OPTIONAL)
VREF
AD8610
VOUT = VREF (1+R2/R1)
Figure 20. Adjustable Voltage Source


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