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參數(shù)資料
| 型號： | AD5066BRUZ-1 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | Fully Accurate 16-Bit UnBuffered VOUT DAC SPI Interface 2.7 V to 5.5 V in a TSSOP |
| 中文描述： | QUAD, SERIAL INPUT LOADING, 14 us SETTLING TIME, 16-BIT DAC, PDSO16 |
| 封裝： | LEAD FREE, MO-153AB, TSSOP-16 |
| 文件頁數(shù)： | 19/20頁 |
| 文件大?。?/td> | 309K |
| 代理商： | AD5066BRUZ-1 |
Preliminary Technical Data
AD5066
APPLICATIONS
USING A REFERENCE AS A POWER SUPPLY FOR
THE AD5066
Because the supply current required by the AD5066 is extremely
low, an alternative option is to use a voltage reference to supply
the required voltage to the parts (see Figure 14). This is
especially useful if the power supply is quite noisy or if the
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 AD5066. If the low dropout
REF195
is used, it
must supply 500 μA of current to the AD5066, 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
Rev. PrB | Page 19 of 20
500 μA + (5 V/5 kΩ) = 1.5 mA
The load regulation of the REF195 is typically 2 ppm/mA,
which results in a 3 ppm (15 μV) error for the 1.5 mA current
drawn from it. This corresponds to a 0.196 LSB error.
AD5066
THREE-WIRE
SERIAL
INTERFACE
SYNC
SCLK
DIN
15V
5V
V
OUT
= 0V TO 5V
V
DD
REF195
0
Figure 14. REF195 as Power Supply to the AD5025/45/65
BIPOLAR OPERATION USING THE AD5066
The AD5066 has been designed for single-supply operation,
but a bipolar output range is also possible using the circuit in
Figure 15. The circuit gives an output voltage range of ±5 V.
Rail-to-rail operation at the amplifier output is achievable using
an
AD820
or an
OP295
as the output amplifier.
The output voltage for any input code can be calculated as
follows:
×
+
R1
×
×
=
R1
R2
V
R2
R1
D
536
,
V
V
DD
DD
O
65
where
D
represents the input code in decimal (0 to 65,535).
With
V
DD
= 5 V,
R1
=
R2
= 10 kΩ,
V
5
536
,
65
10
×
=
D
V
O
This is an output voltage range of ±5 V, with 0x0000 corre-
sponding to a 5 V output, and 0xFFFF corresponding to a
+5 V output.
THREE-WIRE
SERIAL
INTERFACE
R2 = 10k
+5V
–5V
AD820/
OP295
+5V
AD5066
V
DD
V
OUT
R1 = 10k
±5V
0.1μF
10μF
0
Figure 15. Bipolar Operation with the AD5066
USING THE AD5066 WITH A
GALVANICALLY ISOLATED INTERFACE
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.
i
Coupler provides isolation in excess
of 2.5 kV. The AD5066 uses a 3-wire serial logic interface, so the
ADuM1300 three-channel digital isolator provides the required
isolation (see Figure 16). The power supply to the part 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 AD5066.
0.1μF
5V
REGULATOR
GND
DIN
SYNC
SCLK
POWER
10μF
SDI
SCLK
DATA
AD5066
V
OUT
V
OB
V
OA
V
OC
V
DD
V
IC
V
IB
V
IA
ADuM1300
0
Figure 16. AD5025/45/65 with a Galvanically Isolated Interface
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| AD5066BRUZ-1REEL7 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Fully Accurate 16-Bit UnBuffered VOUT DAC SPI Interface 2.7 V to 5.5 V in a TSSOP |
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