AD5320_05 datasheet(16/20 Pages) AD

Part #	AD5320

Description	2.7 V to 5.5 V, 140 關A, Rail-to-Rail Output 12-Bit DAC in an SOT-23

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Manufacturer	AD [Analog Devices]

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AD5320

Rev. C | Page 16 of 20

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 AD5320 should

have separate analog and digital sections, each having its own

area of the board. If the AD5320 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 AD5320.

The power supply to the AD5320 should be bypassed with 10 μF

capacitors and 0.1 μF capacitors. The capacitors should be physi-

cally as close as possible to the device with the 0.1 μF capacitors

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

bead type. It is important that the 0.1 μF capacitors have low

effective series resistance (ESR) and effective series inductance

(ESI), such as common ceramic types of capacitors. The 0.1 μF

capacitors provide 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 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.

Similar Part No. - AD5320_05

Manufacturer	Part #	Datasheet	Description
Analog Devices	AD5320BRM	192Kb / 12P	2.7 V to 5.5 V, 140 uA, Rail-to-Rail Output 12-Bit DAC in a SOT-23 REV. B
	AD5320BRT	192Kb / 12P	2.7 V to 5.5 V, 140 uA, Rail-to-Rail Output 12-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

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Similar Description - AD5320_05

Manufacturer	Part #	Datasheet	Description
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	AD5300	221Kb / 13P	2.7 V to 5.5 V, 140 A, Rail-to-Rail Output 8-Bit DAC in a SOT-23 REV. D
	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
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