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AD586LRZ-REEL1 Fiches technique(PDF) 11 Page - Analog Devices

No de pièce AD586LRZ-REEL1
Description  High Precision 5 V Reference
Download  16 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD586LRZ-REEL1 Fiches technique(HTML) 11 Page - Analog Devices

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AD586
Rev. G | Page 11 of 16
5 V REFERENCE WITH MULTIPLYING
CMOS DACs OR ADCs
The AD586 is ideal for applications with 10- and 12-bit
multiplying CMOS DACs. In the standard hookup, as shown
in Figure 20, 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 in the individual product data
sheets.
AD586
GND
VOUT
VIN
AD711K
0.1
µF
0.1
µF
–15V
0 V TO –5V
+15V
OUT 1
AGND
DGND
DB11 TO DB0
C1
33pF
R2
68
RFB
+15V
VDD
AD7545K
VREF
10k
VOUT
TRIM
+15V
20
18
19
6
5
4
2
3
1
2
7
4
6
3
2
Figure 20. Low Power 12-Bit CMOS DAC Application
The AD586 can also be used as a precision reference for multi-
ple DACs. Figure 21 shows the AD586, the AD7628 dual DAC,
and the AD712 dual op amp hooked up for single-supply opera-
tion 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.
AD586
GND
AD712
OUT A
DGND
AGND
DAC A
DB0
DB7
DATA
INPUTS
OUT B
DAC B
RFB B
RFB A
VREFA
VREFB
AD7628
VIN
VOUT A=
0TO–5V
VOUT B=
0TO–5V
VOUT
+15V
+15V
6
4
4
7
14
2
5
3
17
1
19
20
2
4
Figure 21. AD586 as a 5 V Reference for a CMOS
STACKED PRECISION REFERENCES FOR
MULTIPLE VOLTAGES
Often, a design requires several reference voltages. Three
AD586s can be stacked, as shown in Figure 22, to produce
5.000 V, 10.000 V, and 15.000 V outputs. This scheme can be
extended to any number of AD586s, provided the maximum
load current is not exceeded. This design provides the addi-
tional advantage of improved line regulation on the 5.0 V
output. Changes in VIN of 18 V to 50 V produce output changes
that are below the noise level of the references.
22V TO 46V
AD586
GND
VOUT
VIN
TRIM
10k
AD586
GND
VOUT
VIN
TRIM
AD586
GND
VOUT
VIN
TRIM
10k
10k
15V
10V
5V
2
4
5
6
2
4
5
6
2
4
5
6
Figure 22. Multiple AD586s Stacked for Precision 5 V, 10 V, and 15 V Outputs
PRECISION CURRENT SOURCE
The design of the AD586 allows it to be easily configured as a
current source. By choosing the control resistor RC in Figure 23,
the user can vary the load current from the quiescent current
(typically, 2 mA) to approximately 10 mA. The compliance volt-
age of this circuit varies from about 5 V to 21 V, depending on
the value of VIN.
AD586
GND
VOUT
VIN
5V
RC
IL =
+ IBIAS
+VIN
RC
(500
Ω MIN)
2
4
6
Figure 23. Precision Current Source
PRECISION HIGH CURRENT SUPPLY
For higher currents, the AD586 can easily be connected to a
power PNP or power Darlington PNP device. The circuit in
Figure 24 and Figure 25 can deliver up to 4 amps to the load.
The 0.1 µF capacitor is required only if the load has a significant
capacitive component. If the load is purely resistive, improved
high frequency supply rejection results can be obtained by
removing the capacitor.


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