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参数资料
| 型号： | AD5322BRM |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | DAC |
| 英文描述： | 12-bit, 210MSPS ADC with DDR LVDS/CMOS outputs 48-VQFN -40 to 85 |
| 中文描述： | SERIAL INPUT LOADING, 8 us SETTLING TIME, 12-BIT DAC, PDSO10 |
| 封装： | MO-187BA, MSOP-10 |
| 文件页数： | 14/16页 |
| 文件大小： | 207K |
| 代理商： | AD5322BRM |
REV. 0
AD5302/AD5312/AD5322
–14–
1
m
F
V
REF
A
V
REF
B
AD5302/AD5312/
AD5322
SCLK
DIN
SYNC
V
DD
GND
V
OUT
A
V
OUT
B
+6V TO +16V
SERIAL
INTERFACE
V
OUT
V
IN
GND
REF195
0.1
m
F
10
m
F
Figure 37. Using an REF195 as Power and Reference to
the AD5302/AD5312/AD5322
Bipolar Operation Using the AD5302/AD5312/AD5322
The AD5302/AD5312/AD5322 has been designed for single
supply operation, but bipolar operation is also achievable using
the circuit shown in Figure 38. The circuit shown has been config-
ured to achieve an output voltage range of –5V < V
OUT
< +5 V.
Rail-to-rail operation at the amplifier output is achievable using
an AD820 or OP295 as the output amplifier.
1
m
F
V
REF
A/B
AD5302/AD5312/
AD5322
SCLK
DIN
SYNC
GND
V
DD
V
OUT
A/B
0.1
m
F
10
m
F
V
DD
= +5V
V
OUT
V
IN
GND
REF
195
SERIAL
INTERFACE
AD820/
OP295
6
5V
+5V
–5V
R1
10k
V
R2
10k
V
+6V TO +16V
Figure 38. Bipolar Operation Using the AD5302/AD5312/
AD5322
The output voltage for any input code can be calculated as
follows:
V
OUT
= [(
V
REF
×
D
/2
N
)
×
(
R
1+
R
2)/
R
1 –
V
REF
×
(
R
2/
R
1)]
where
D
is the decimal equivalent of the code loaded to the DAC
N
is the DAC resolution
V
REF
is the reference voltage input.
with
V
REF
= 5
V
R
1 =
R
2 = 10
k
and
V
DD
= 5
V
V
OUT
= (10
×
D
/2
N
) – 5
V
Opto-Isolated Interface for Process Control Applications
The AD5302/AD5312/AD5322 has a versatile 3-wire serial
interface, making it ideal for generating accurate voltages in
process control and industrial applications. Due to noise, safety
requirements or distance, it may be necessary to isolate the
AD5302/AD5312/AD5322 from the controller. This can easily
be achieved by using opto-isolators, which will provide isolation
in excess of 3 kV. The serial loading structure of the AD5302/
AD5312/AD5322 makes it ideally suited for use in opto-isolated
applications. Figure 39 shows an opto-isolated interface to the
AD5302/AD5312/AD5322 where DIN, SCLK and
SYNC
are
driven from opto-couplers. The power supply to the part also
needs to be isolated. This 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 AD5302/AD5312/AD5322.
V
DD
SCLK
10k
V
AD5302/AD5312/
AD5322
V
REF
A
DIN
SYNC
V
DD
GND
V
OUT
A
0.1
m
F
10
m
F
V
REF
B
V
OUT
B
SCLK
+5V
REGULATOR
POWER
V
DD
SYNC
10k
V
V
DD
DIN
10k
V
Figure 39. AD5302/AD5312/AD5322 in an Opto-Isolated
Interface
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