AD5662_15 datasheet(20/24 Pages) AD

Part #	AD5662

Description	2.7 V to 5.5 V, 250 A, Rail-to-Rail Output 16-Bit nanoDACT in a SOT-23

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AD5662

Rev. A | Page 20 of 24

USING AD5662 WITH A

GALVANICALLY ISOLATED INTERFACE

In process-control applications in industrial environments, it is

often necessary to use a galvanically isolated interface to protect

and isolate the controlling circuitry from any hazardous

common-mode voltages that might occur in the area where the

DAC is functioning. Isocouplers provide isolation in excess of

3 kV. The AD5662 uses a 3-wire serial logic interface, so the

ADuM130x 3-channel digital isolator provides the required

isolation (see Figure 44). The power supply to the part also

needs to be isolated, which 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 AD5662.

0.1

μF

+5V

REGULATOR

GND

DIN

SYNC

SCLK

POWER

10

μF

SDI

SCLK

DATA

AD5662

VOUT

VOB

VOC

VDD

V1C

V1B

V1A

ADMu103x

Figure 44. AD5662 with a Galvanically Isolated Interface

POWER SUPPLY BYPASSING AND GROUNDING

When accuracy is important in a circuit, it is helpful to carefully

consider the power supply and ground return layout on the

board. The printed circuit board containing the AD5662 should

have separate analog and digital sections, each having its own

area of the board. If the AD5662 is in a system where other

devices require an AGND-to-DGND connection, the connection

should be made at one point only. This ground point should be

as close as possible to the AD5662.

The power supply to the AD5662 should be bypassed with 10 μF

and 0.1 μF capacitors. The capacitors should be located as close

as possible to the device, with the 0.1 μF capacitor ideally right

up against the device. The 10 μF capacitors are the tantalum

bead type. It is important that the 0.1 μF capacitor has low

effective series resistance (ESR) and effective series inductance

(ESI), for example, common ceramic types of capacitors. This

0.1 μF 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

possible to provide a low impedance path and to 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 2-layer board.

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Similar Description - AD5662_15

Manufacturer	Part #	Datasheet	Description
Analog Devices	AD5662	357Kb / 20P	2.7 V to 5.5 V, 250 uA, Rail-to-Rail Output 16-Bit DAC D/A in a SOT-23 Rev. PrA
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	AD5310	578Kb / 16P	2.7 V to 5.5 V, 140 A, Rail-to-Rail Voltage Output 10-Bit DAC in a SOT-23 REV. B
	AD5320	410Kb / 20P	2.7 V to 5.5 V, 140 A, Rail-to-Rail Output 12-Bit DAC in an SOT-23 REV. C
	AD5300BRMZ-REEL7	221Kb / 13P	2.7 V to 5.5 V, 140 muA, Rail-to-Rail Output 8-Bit DAC in a SOT-23 REV. D
	AD5320	192Kb / 12P	2.7 V to 5.5 V, 140 uA, Rail-to-Rail Output 12-Bit DAC in a SOT-23 REV. B
	AD5310BRMZ-REEL7	578Kb / 16P	2.7 V to 5.5 V, 140 muA, Rail-to-Rail Voltage Output 10-Bit DAC in a SOT-23 REV. B
	AD5320	410Kb / 20P	2.7 V to 5.5 V, 140 關A, Rail-to-Rail Output 12-Bit DAC in an SOT-23 REV. C
	AD5310	164Kb / 12P	2.7 V to 5.5 V, 140 uA, Rail-to-Rail Voltage Output 10-Bit DAC in a SOT-23 REV. A

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