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AD586KR データシート(PDF) 7 Page - Analog Devices

部品番号 AD586KR
部品情報  High Precision 5 V Reference
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
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AD586KR データシート(HTML) 7 Page - Analog Devices

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AD586
REV. C
–7–
NEGATIVE REFERENCE VOLTAGE FROM AN AD586
The AD586 can be used to provide a precision –5.000 V output
as shown in Figure 11. The VIN pin is tied to at least a +6 V
supply, the output pin is grounded, and the AD586 ground pin
is connected through a resistor, RS, to a –15 V supply. The –5 V
output is now taken from the ground pin (Pin 4) instead of
VOUT. It is essential to arrange the output load and the supply
resistor RS so that the net current through the AD586 is be-
tween 2.5 mA and 10.0 mA. The temperature characteristics
and long-term stability of the device will be essentially the same
as that of a unit used in the standard +5 V output configuration.
Figure 11. AD586 as a Negative 5 V Reference
USING THE AD586 WITH CONVERTERS
The AD586 is an ideal reference for a wide variety of 8-, 12-,
14- and 16-bit A/D and D/A converters. Several representative
examples follow.
5 V REFERENCE WITH MULTIPLYING CMOS D/A OR
A/D CONVERTERS
The AD586 is ideal for applications with 10- and 12-bit multi-
plying CMOS D/A converters. In the standard hookup, as
shown in Figure 12, the AD586 is paired with the AD7545
12-bit multiplying DAC and the AD711 high-speed BiFET Op
Amp. The amplifier DAC configuration produces a unipolar
0 V to –5 V output range. Bipolar output applications and other
operating details can be found on the individual product data
sheets.
Figure 12. Low-Power 12-Bit CMOS DAC Application
The AD586 can also be used as a precision reference for mul-
tiple DACs. Figure 13 shows the AD586, the AD7628 dual
DAC and the AD712 dual op amp hooked up for single supply
operation to produce 0 V to –5 V outputs. Because both DACs
are on the same die and share a common reference and output
op amps, the DAC outputs will exhibit similar gain TCs.
Figure 13. AD586 as a 5 V Reference for a CMOS
Dual DAC
STACKED PRECISION REFERENCES FOR
MULTIPLE VOLTAGES
Often, a design requires several reference voltages. Three
AD586s can be stacked, as shown in Figure 14, to produce
+5.000 V, +10.000 V, and +15.000 V outputs. This scheme
can be extended to any number of AD586s as long as the
maximum load current is not exceeded. This design pro-
vides the additional advantage of improved line regulation
on the +5.0 V output. Changes in VIN of +18 V to +50 V
produces an output change that is below the noise level of
the references.
Figure 14. Multiple AD586s Stacked for Precision 5 V,
10 V and 15 V Outputs


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