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參數(shù)資料
| 型號： | V375C5E24BL2 |
| 廠商： | Vicor Corporation |
| 元件分類： | DC/DC變換器 |
| 英文描述： | FasTrak Micro E-Grade Family DC-DC Converter Module |
| 中文描述： | FasTrak車輛使用的微型電子級系列的DC - DC轉(zhuǎn)換器模塊 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大小： | 164K |
| 代理商： | V375C5E24BL2 |
AD5310
–11–
REV. A
Bipolar Operation Using the AD5310
The AD5310 has been designed for single-supply operation
but a bipolar output range is also possible using the circuit in
Figure 30. The circuit below will give 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:
V
O
=
V
DD
×
D
1024
×
R
1
+
R
2
R
1
–
V
DD
×
R
2
R
1
where
D
represents the input code in decimal (0–1023).
With
V
DD
= 5 V,
R
1 =
R
2 = 10 k
:
V
O
=
10
×
D
1024
–5
V
This is an output voltage range of
±
5 V with 000 Hex corre-
sponding to a –5 V output and 3FF Hex corresponding to a
+5 V output.
THREE-WIRE
SERIAL
INTERFACE
+5V
AD5310
10
m
F
0.1
m
F
V
DD
V
OUT
R1 = 10k
V
R2 = 10k
V
+5V
6
5V
–5V
AD820/
OP295
Figure 30. Bipolar Operation with the AD5310
Using AD5310 with an Opto-Isolated Interface
In process-control applications in industrial environments it
is often necessary to use an opto-isolated interface in order to
protect and isolate the controlling circuitry from any hazard-
ous common-mode voltages which may occur in the area
where the DAC is functioning. Opto-isolators provide isola-
tion in excess of 3 kV. Because the AD5310 uses a three-wire
serial logic interface, it only requires three opto-isolators to
provide the required isolation (see Figure 31). 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
AD5310.
V
DD
0.1
m
F
V
DD
10k
V
10k
V
V
DD
10k
V
+5V
REGULATOR
V
OUT
GND
DIN
SYNC
SCLK
POWER
10
m
F
V
DD
SYNC
SCLK
DATA
AD5310
Figure 31. AD5310 with an Opto-Isolated Interface
Power Supply Bypassing and Grounding
When accuracy is important in a circuit it is helpful to consider
carefully the power supply and ground return layout on the
board. The printed circuit board containing the AD5310 should
have separate analog and digital sections, each having their own
area of the board. If the AD5310 is in a system where other
devices require an AGND to DGND connection, the connec-
tion should be made at one point only. This ground point
should be as close as possible to the AD5310.
The power supply to the AD5310 should be bypassed with
10
μ
F and 0.1
μ
F capacitors. The capacitors should be physi-
cally as close as possible to the device with the 0.1
μ
F capacitor
ideally right up against the device. The 10
μ
F capacitors are the
tantalum bead type. It is important that the 0.1
μ
F capacitor has
low Effective Series Resistance (ESR) and Effective Series In-
ductance (ESI), e.g., common ceramic types of capacitors. This
0.1
μ
F capacitor provides a low impedance path to ground for
high frequencies caused by transient currents due to internal
logic switching.
The power supply line itself should have as large a trace as pos-
sible to provide a low impedance path and reduce glitch effects
on the supply line. Clocks and other fast switching digital signals
should be shielded from other parts of the board by digital
ground. Avoid crossover of digital and analog signals if possible.
When traces cross on opposite sides of the board ensure that
they run at right angles to each other to reduce feedthrough
effects through the board. The best board layout technique is
the microstrip technique where the component side of the board
is dedicated to the ground plane only and the signal traces are
placed on the solder side. However, this is not always possible
with a two-layer board.
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