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AD7242 Datasheet(PDF) 11 Page - Analog Devices |
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AD7242 Datasheet(HTML) 11 Page - Analog Devices |
11 / 12 page 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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