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AD5025BRUZ-REEL7 Fiches technique(PDF) 31 Page - Analog Devices

No de pièce AD5025BRUZ-REEL7
Description  Fully Accurate 12-/14-/16-Bit VOUT DAC SPI Interface 2.7 V to 5.5 V in a TSSOP
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD5025BRUZ-REEL7 Fiches technique(HTML) 31 Page - Analog Devices

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Preliminary Technical Data
AD5025/45/65
APPLICATIONS
USING A REFERENCE AS A POWER SUPPLY FOR
This is an output voltage range of ±5 V, with 0x0000 corre-
THE AD5025/45/65
sponding to a −5 V output, and 0xFFFF corresponding to a
Because the supply current required by the AD5025/45/65 is
+5 V output.
extremely low, an alternative option is to use a voltage reference
R2 = 10kΩ
+5V
–5V
AD820/
OP295
AD5025/45/65
VDD
VOUT
R1 = 10kΩ
±5V
0.1µF
10µF
to supply the required voltage to the parts (see Figure 52). This is
especially useful if the power supply is quite noisy or if the
+5V
system supply voltages are at some value other than 5 V or 3 V,
for example, 15 V. The voltage reference outputs a steady supply
voltage for the AD5025, AD5045 and AD5065. If the low
dropout REF195 is used, it must supply 500 μA of current to the
AD5025/ AD5045 / AD5065, with no load on the output of the
DAC. When the DAC output is loaded, the REF195 also needs
to supply the current to the load. The total current required
(with a 5 kΩ load on the DAC output) is
THREE-WIRE
SERIAL
INTERFACE
500 μA + (5 V/5 kΩ) = 1.5 mA
Figure 53. Bipolar Operation with the AD5025/45/65
The load regulation of the REF195 is typically 2 ppm/mA,
USING THE AD5025/45/65 WITH A
which results in a 3 ppm (15 μV) error for the 1.5 mA current
GALVANICALLY ISOLATED INTERFACE
drawn from it. This corresponds to a 0.196 LSB error.
In process control applications in industrial environments,
it is often necessary to use a galvanically isolated interface to
protect and isolate the controlling circuitry from any hazardous
common-mode voltages that can occur in the area where
the DAC is functioning. iCoupler® provides isolation in excess
of 2.5 kV. The AD5025/45/65 uses a 3-wire serial logic interface,
so the ADuM1300 three-channel digital isolator provides the
required isolation (see Figure 54). The power supply to the part
AD5065/
AD5045/
AD5025
THREE-WIRE
SERIAL
INTERFACE
SYNC
SCLK
DIN
15V
5V
VOUT =0VTO 5V
VDD
REF195
also needs to be isolated, which is done by using a transformer.
On the DAC side of the transformer, a 5 V regulator provides
the 5 V supply required for the AD5025/45/65.
Figure 52. REF195 as Power Supply to the AD5025/45/65
BIPOLAR OPERATION USING THE AD5025/45/65
The AD5025/45/65 has been designed for single-supply
operation, but a bipolar output range is also possible using the
circuit in Figure 53. The circuit gives an output voltage range of
±5 V. Rail-to-rail operation at the amplifier output is achievable
0.1µF
5V
REGULATOR
GND
DIN
SYNC
SCLK
POWER
10µF
AD5025/45/65
VOUT
VOB
VOA
VOC
VDD
VIC
VIB
VIA
ADuM1300
using an AD820 or an OP295 as the output amplifier.
SCLK
The output voltage for any input code can be calculated as
follows:
SDI
V
DD
D
R1 + R2
R2
V
O
V
DD
×
×
×
=
where D represents the input code in decimal (0 to 65,535).
With VDD = 5 V, R1 = R2 = 10 kΩ,
65,536
R1
R1
DATA
Figure 54. AD5025/45/65 with a Galvanically Isolated Interface
=
10 × D
V
O
− 5 V
65,536
Rev. PrB | Page 31 of 3
3


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