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AD7242 Datasheet(PDF) 11 Page - Analog Devices

Part No. AD7242
Description  LC2MOS Dual, Complete, 12-Bit/14-Bit Serial DACs
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD7242 Datasheet(HTML) 11 Page - Analog Devices

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AD7242/AD7244
REV. A
–11–
APPLYING THE AD7242/AD7244
Good printed circuit board layout is as important as the overall
circuit design itself in achieving high speed converter perfor-
mance. The AD7242 works on an LSB size of 1.465 mV, while
the AD7244 works on an LSB size of 366
µV. Therefore, the
designer must be conscious of minimizing noise in both the
converter itself and in the surrounding circuitry. Switching
mode power supplies are not recommended as the switching
spikes can feed through to the on-chip amplifier. Other causes
of concern are ground loops and digital feedthrough from
microprocessors. These are factors that influence any high
performance converter, and a proper PCB layout that minimizes
these effects is essential for best performance.
LAYOUT HINTS
Ensure that the layout for the printed circuit board has separated
digital and analog lines as much as possible. Take care not to
run any digital track alongside an analog signal track. Establish a
single point analog ground (star ground) separate from the logic
system ground. Place this star ground as close as possible to the
AD7242/AD7244. Connect all analog grounds to this star
ground and also connect the AD7242/AD7244 DGND pins to
this ground. Do not connect any other digital grounds to this
analog ground point.
Low impedance analog and digital power supply common
returns are essential to low noise operation of high performance
converters. Therefore, the foil width for these tracks should be
kept as wide as possible. The use of ground planes minimizes
impedance paths and also guards the analog circuitry from
digital noise.
NOISE
Keep the signal leads on the VOUTA and VOUTB signals and the
signal return leads to AGND as short as possible to minimize
noise coupling. In applications where this is not possible, use a
shielded cable between the DAC outputs and their destination.
Reduce the ground circuit impedance as much as possible since
any potential difference in grounds between the DAC and its
destination device appears as an error voltage in series with the
DAC output.


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