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AD587 Arkusz danych(PDF) 10 Page - Analog Devices

Numer części AD587
Szczegółowy opis  High Precision 10 V Reference
Download  12 Pages
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

AD587 Arkusz danych(HTML) 10 Page - Analog Devices

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AD587
Rev. H | Page 10 of 12
APPLICATIONS INFORMATION
USING THE AD587 WITH CONVERTERS
The AD587 is an ideal reference for a variety of 8-bit, 12-bit,
14-bit, and 16-bit ADCs and DACs. Several examples follow.
10 V Reference with Multiplying CMOS DACs or ADCs
The AD587 is ideal for applications with 10-bit and 12-bit
multiplying CMOS DACs. In the standard hookup, shown in
Figure 18, the AD587 is paired with the AD7545 12-bit multi-
plying DAC and the AD711 high speed BiFET op amp. The
amplifier DAC configuration produces a unipolar 0 V to −10 V
output range. Bipolar output applications and other operating
details can be found in the individual product data sheets.
AD587
GND
AD711
–15V
+15V
OUT1
DGND
DB11 TO DB0
C1
33pF
R2
+15V
AD7545
TRIM
+15V
+VIN
VOUT
0.1µF
VREF
VDD
RFB
AGND
0.1µF
0.1µF
VOUT
0V TO –10V
10kΩ
Figure 18. Low Power 12-Bit CMOS DAC Application
The AD587 can also be used as a precision reference for multi-
ple DACs. Figure 19 shows the AD587, the AD7628 dual DAC,
and the AD712 dual op amp hooked up for single-supply
operation to produce 0 V to −10 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 temperature
coefficients (TCs).
AD587
GND
AD712
+15V
OUT A
DGND
+15V
AGND
DAC A
DB0
DB7
OUT B
DAC B
18
RFB B
RFB A
AD7628
+VIN
VOUT
0.1µF
DATA
INPUTS
VREFA
VREFB
VOUTA =
0 TO –10V
VOUTB =
0 TO –10V
Figure 19. AD587 as a 10 V Reference for a CMOS Dual DAC
Precision Current Source
The design of the AD587 allows it to be easily configured as a cur-
rent source. By choosing the control resistor (RC) via the equation
shown in Figure 20, the user can vary the load current from the
quiescent current (2 mA typically) to approximately 10 mA.
2
6
4
GND
AD587
+VIN
+VIN
VOUT
IL =
+ IBIAS
10V
RC
RC
500Ω
MIN
Figure 20. Precision Current Source
Precision High Current Supply
For higher currents, the AD587 can easily be connected to a
power PNP or power Darlington PNP device. The circuits in
Figure 21 and Figure 22 can deliver up to 4 A 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.
AD587
2
6
4
2N6285
RC
VOUT
IL =
+ IBIAS
10V
RC
+VIN
0.1µF
+VIN
220Ω
GND
Figure 21. Precision High Current Source
AD587
2
6
4
2N6285
VOUT
+VIN
0.1µF
+VIN
220Ω
VOUT
+10V @ 4A
GND
Figure 22. Precision High Current Voltage Source


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