AD5755-1_11 AD [Analog Devices], AD5755-1_11 Datasheet - Page 47

• Manufacturer Part Number: AD5755-1_11
• Description: Quad Channel, 16-Bit,Serial Input, 4 mA to 20 mA and Voltage Output DAC,Dynamic Power Control
• Manufacturer: AD [Analog Devices]

side of the board is dedicated to ground plane, whereas signal
traces are placed on the solder side.
DC-to-DC Converters
To achieve high efficiency, good regulation, and stability, a well-
designed printed circuit board layout is required.
Follow these guidelines when designing printed circuit boards
(see Figure 80):
•
•
•
•
•
•
Keep the low ESR input capacitor, C
PGND.
Keep the high current path from C
L
Keep the high current path from C
rectifier, D
possible.
Keep high current traces as short and as wide as possible.
The path from C
PGND should be able to handle a minimum of 1 A.
Place the compensation components as close as possible to
COMP
Avoid routing high impedance traces near any node
connected to SW
noise injection.
DCDC
, to SW
DCDC_x
DCDC
.
X
and PGND as short as possible.
, to the output capacitor, C
IN
x
or near the inductor to prevent radiated
through the inductor, L
IN
IN
IN
through the inductor,
through L
, close to AV
DCDC
DCDC
, as short as
, to SW
DCDC
CC
and the
and
X
and
Rev. A | Page 47 of 48
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 AD5755-1 makes it ideal for
isolated interfaces because the number of interface lines is kept
to a minimum. Figure 88 shows a 4-channel isolated interface to
the AD5755-1 using an ADuM1400. For more information,
visit www.analog.com.
*ADDITIONAL PINS OMITTED FOR CLARITY.
MICROCONTROLLER
SERIAL CLOCK
CONTROL OUT
SERIAL DATA
SYNC OUT
OUT
OUT
V
V
V
V
ADuM1400*
IA
IB
IC
ID
Figure 88. Isolated Interface
ENCODE
ENCODE
ENCODE
ENCODE
DECODE
DECODE
DECODE
DECODE
AD5755-1
V
V
V
V
OA
OB
OC
OD
TO SCLK
TO SDIN
TO SYNC
TO LDAC