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參數(shù)資料
| 型號： | AD5732R |
| 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 |
| 文件頁數(shù)： | 16/20頁 |
| 文件大?。?/td> | 405K |
| 代理商： | AD5732R |
AD5726
Single +5 V Supply Operation
For operation with a 5 V supply, the reference voltage should be
set between 1.0 V and 2.5 V for optimum linearity. Figure 26
shows an
AD780
used to supply a 2.5 V reference voltage. The
headroom of the reference and DAC are both sufficient to support
a 5 V supply with ±5 V tolerance. AV
DD
and V
L
should be
connected to the same supply. Separate bypassing to each pin
should be used.
Rev. 0 | Page 16 of 20
5V
10μF
0.01μF
INPUT
OUTPUT
GND
TRIM
0.2μF
AD780
AD5726
AV
DD
AV
SS
V
REFP
V
REFN
0V TO 2.5V OPERATION
SINGLE 5V SUPPLY
10k
0.1μF
║
10μF
0
Figure 26. 5 V Single-Supply Operation
POWER SUPPLY BYPASSING AND GROUNDING
In any circuit where accuracy is important, careful consideration
to the power supply and ground return layout helps to ensure
the rated performance. The AD5726 has a single ground pin
that is internally connected to the digital section as the logic
reference level. The user’s first instinct may be to connect this
pin to the digital ground; however, in large systems, the digital
ground is often noisy because of the switching currents of other
digital circuitry. Any noise introduced at the ground pin could
couple into the analog output. Thus, to avoid error-causing
digital noise in the sensitive analog circuitry, the ground pin
should be connected to the system analog ground.
The ground path (circuit board trace) should be as wide as
possible to reduce any effects of parasitic inductance and ohmic
drops. A ground plane is recommended if possible. The noise
immunity of the on-board digital circuitry, typically in the
hundreds of millivolts, is well able to reject the common-mode
noise typically seen between system analog and digital grounds.
Finally, the analog and digital ground should be connected to
each other at a single point in the system to provide a common
reference. This is preferably done at the power supply
Good grounding practice is essential to maintain analog perform-
ance in the surrounding analog support circuitry as well. With
two reference inputs and four analog outputs capable of moderate
bandwidth and output current, there is a significant potential
for ground loops. Again, a ground plane is recommended as
the most effective solution to minimize errors due to noise and
ground offsets.
The AD5726 should have ample supply bypassing located as
close to the package as possible. Recommended capacitor values
are 10 μF in parallel with 0.1 μF. The 0.1 μF capacitor should
have low effective series resistance (ESR) and effective series
inductance (ESI), such as the common ceramic types, which
provide a low impedance path to ground at high frequencies to
handle transient currents due to internal logic switching.
GALVANICALLY ISOLATED INTERFACE
In many process control applications, it is necessary to provide
an isolation barrier between the controller and the unit being
controlled to protect and isolate the controlling circuitry from any
hazardous common-mode voltages that may occur. Isocouplers
provide voltage isolation in excess of 2.5 kV. The serial loading
structure of the AD5726 makes it ideal for isolated interfaces
because the number of interface lines is kept to a minimum.
Figure 27 shows a 4-channel isolated interface connected to the
AD5726 using an
ADuM1400
.
ENCODE
DECODE
ENCODE
DECODE
ENCODE
DECODE
ENCODE
DECODE
V
IA
V
IB
V
IC
V
ID
V
OA
V
OB
V
OC
V
OD
TO SCLK
TO SDIN
TO CS
TO LDAC
ADuM1400*
SERIAL CLOCK OUT
SERIAL DATA OUT
SYNC OUT
CONTROL OUT
MICROCONTROLLER
*ADDITIONAL PINS OMITTED FOR CLARITY.
0
Figure 27. Isolated Interface
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