AD5304/AD5314/AD5324 Data Sheet
Rev. H | Page 20 of 24
POWER SUPPLY BYPASSING AND GROUNDING
In any circuit where accuracy is important, careful consideration of
the power supply and ground return layout helps to ensure the
rated performance. The printed circuit board on which the
AD5304/AD5314/AD5324 is mounted is designed so that the
analog and digital sections are separated and confined to certain
areas of the board. If the AD5304/AD5314/AD5324 are in a
system where multiple devices require an AGND-to-DGND
connection, the connection is made at one point only. The star
ground point is established as close as possible to the device. The
AD5304/AD5314/AD5324 has ample supply bypassing of 10 F in
parallel with 0.1 F on the supply located as close to the package as
possible, ideally right up against the device. The 10 F capacitors
are the tantalum bead type. The 0.1 F capacitor has low effective
series resistance (ESR) and effective series inductance (ESI), like
the common ceramic types that provide a low impedance path
to ground at high frequencies, to handle transient currents due
to internal logic switching.
The power supply lines of the AD5304/AD5314/AD5324 use as
large a trace as possible to provide low impedance paths and reduce
the effects of glitches on the power supply line. Fast switching
signals such as clocks are shielded with digital ground to avoid
radiating noise to other parts of the board, and are never run
near the reference inputs. Avoid crossover of digital and analog
signals. Traces on opposite sides of the board run at right angles
to each other. This reduces the effects of feedthrough through
the board. A microstrip technique is by far the best, but is not
always possible with a double-sided board. In this technique,
the component side of the board is dedicated to a ground plane
while signal traces are placed on the solder side.
Table 7. Overview of AD53xx Serial Devices
Part No. Resolution No. of DACs DNL Interface Settling Time (s) Package Pins
SINGLES
AD5300 8 1 ±0.25 SPI 4 SOT-23, MSOP 6, 8
AD5310 10 1 ±0.5 SPI 6 SOT-23, MSOP 6, 8
AD5320 12 1 ±1.0 SPI 8 SOT-23, MSOP 6, 8
AD5301 8 1 ±0.25 2-Wire 6 SOT-23, MSOP 6, 8
AD5311 10 1 ±0.5 2-Wire 7 SOT-23, MSOP 6, 8
AD5321 12 1 ±1.0 2-Wire 8 SOT-23, MSOP 6, 8
DUALS
AD5302 8 2 ±0.25 SPI 6 MSOP 8
AD5312 10 2 ±0.5 SPI 7 MSOP 8
AD5322 12 2 ±1.0 SPI 8 MSOP 8
AD5303 8 2 ±0.25 SPI 6 TSSOP 16
AD5313 10 2 ±0.5 SPI 7 TSSOP 16
AD5323 12 2 ±1.0 SPI 8 TSSOP 16
QUADS
AD5304 8 4 ±0.25 SPI 6 MSOP, LFCSP 10
AD5314 10 4 ±0.5 SPI 7 MSOP, LFCSP 10
AD5324 12 4 ±1.0 SPI 8 MSOP, LFCSP 10
AD5305 8 4 ±0.25 2-Wire 6 MSOP 10
AD5315 10 4 ±0.5 2-Wire 7 MSOP 10
AD5325 12 4 ±1.0 2-Wire 8 MSOP 10
AD5306 8 4 ±0.25 2-Wire 6 TSSOP 16
AD5316 10 4 ±0.5 2-Wire 7 TSSOP 16
AD5326 12 4 ±1.0 2-Wire 8 TSSOP 16
AD5307 8 4 ±0.25 SPI 6 TSSOP 16
AD5317 10 4 ±0.5 SPI 7 TSSOP 16
AD5327 12 4 ±1.0 SPI 8 TSSOP 16
OCTALS
AD5308 8 8 ±0.25 SPI 6 TSSOP 16
AD5318 10 8 ±0.5 SPI 7 TSSOP 16
AD5328 12 8 ±1.0 SPI 8 TSSOP 16
