參數(shù)資料
型號(hào)： AD5734R
廠商： Analog Devices, Inc.
英文描述： Quad 12-Bit Serial Input Unipolar/Bipolar Voltage Output DAC
中文描述： 四路12位串行輸入單極性/雙極性電壓輸出DAC
文件頁(yè)數(shù)： 15/20頁(yè)
文件大小： 405K
代理商： AD5734R
AD5726
APPLICATIONS
POWER-UP SEQUENCE
To prevent CMOS latch-up conditions, powering AV
DD
, AV
SS
,
and GND prior to any reference voltages is recommended. The
ideal power-up sequence is GND, AV
SS
, AV
DD
, V
REFP
, V
REFN
, and
the digital inputs. Noncompliance with the power-up sequence
over an extended period can elevate the reference currents and
eventually damage the device. On the other hand, if the non-
compliant power-up sequence condition is as short as a few
milliseconds, the device can resume normal operation without
damage once AV
DD
/AV
SS
are powered up.
REFERENCE CONFIGURATION
Output voltage ranges can be configured as either unipolar or
bipolar, and within these choices, a wide variety of options
exists. The unipolar configuration can be either a positive (as
shown in Figure 23) or a negative voltage output. The bipolar
configuration can be either symmetrical (as shown in Figure 24)
or nonsymmetrical.
Rev. 0 | Page 15 of 20
ADR01
+15V
INPUT
OUTPUT
TRIM
10k
+10V OPERATION
+15V
AD5726
0.1μF
║
10μF
–15V
OP1177
AV
DD
AV
SS
V
REFP
0.2μF
V
REFN
+
0
Figure 23. Unipolar +10 V Operation
0.2μF
AD5726
+15V
+15V
–15V
AV
DD
V
REFP
V
REFN
AV
SS
BA100k
GAIN
100k
4
6
12
5
13
8
3
1
14
15
7
6.2
0.2μF
6.2
1μF
39k
AD688 FOR ±10V
AD588 FOR ±5V
±5 OR ±10V OPERATION
0.1μF
║
10μF
0
Figure 24. Symmetrical Bipolar Operation
Figure 24 (symmetrical bipolar operation) shows the AD5726
configured for ±10 V operation. See the
AD688
datasheet for a
full explanation of the reference operation.
Adjustments may not be necessary for many applications
because the AD688 is a very high accuracy reference. However,
if additional adjustments are required, adjust the AD5726 full-
scale first. Begin by loading the digital full-scale code (0xFFF).
Then, modify the gain adjust potentiometer to attain a DAC
output voltage of 9.9976 V. Next, alter the balance adjust to set
the midscale output voltage to 0.000 V.
The 0.2 μF bypass capacitors shown at their reference inputs in
Figure 24 should be used whenever ±10 V references are used.
Applications with single references or references to ±5 V may
not require the 0.2 μF bypassing. The 6.2 Ω resistor in series
with the output of the reference amplifier keeps the amplifier
from oscillating with the capacitive load. This has been found to
be large enough to stabilize this circuit. Larger resistor values
are acceptable if the drop across the resistor does not exceed a V
BE
.
Assuming a minimum V
BE
of 0.6 V and a maximum current of
2.75 mA, the resistor should be under 200 Ω for the loading of a
single AD5726.
Using two separate references is not recommended. Having two
references may cause different drifts with time and temperature,
whereas with a single reference, most drifts track.
Unipolar positive full-scale operation can usually be set by a
reference with the correct output voltage. This is preferable to
using a reference and dividing down to the required value. For a
10 V full-scale output, the circuit can be configured as shown in
Figure 25. In this configuration, the full-scale value is first set by
adjusting the 10 kΩ resistor for a full-scale output of 9.9976 V.
AD5726
0.2μF
0V TO –10V OPERATION
U2
+15V
–15V
–15V
U1
ADR01
TEMP
GND
+15V
+15V
OP1177
V–
V+
V
OUT
V
IN
TRIM
AV
DD
V
REFP
V
REFN
AV
SS
0.1μF
║
10μF
0
Figure 25. Unipolar 10 V Operation
Figure 25 shows the AD5726 configured for 10 V to 0 V opera-
tion. An
ADR01
and
OP1177
are configured to produce a 10 V
output that is connected directly to V
REFP
for the reference voltage.
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