ADS7945 Datasheet, PDF (42/49 Pages) Texas Instruments – 14-Bit, 2 MSPS, Dual-Channel, Differential/Single-Ended, Ultralow-Power Analog-to-Digital Converters

ADS7945
ADS7946
SBAS539B – JUNE 2011 – REVISED SEPTEMBER 2011
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A common ground plane for both analog and digital often enables better results. Typically, the second PCB layer
is the ground plane. The ADC ground pins are returned to the ground plane through multiple vias (PTH). It is a
good practice to place analog components on one side and digital components on other side of the ADC (or
ADCs). All signals must be routed, assuming there is a split ground plane for analog and digital. Furthermore, it
is better to split the ground initially during layout. Route all analog and digital traces so that the traces see the
respective ground all along the second layer. Then short both grounds to form a common ground plane.
Figure 93 shows a typical layout around the ADC.
Figure 93. Recommended ADS7946 ADC Layout
(Only top layer is shown; second layer is common ground for analog and digital)
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