CS4351
4.8
Grounding and Power Supply Arrangements
As with any high resolution converter, the CS4351 requires careful attention to power supply and ground-
ing arrangements if its potential performance is to be realized. Figure 4 shows the recommended power
arrangements, with VA_H, VA, VD, and VL connected to clean supplies. If the ground planes are split
between digital ground and analog ground, the GND pins of the CS4351 should be connected to the analog
ground plane.
All signals, especially clocks, should be kept away from the VBIAS and VQ pins in order to avoid unwant-
ed coupling into the DAC.
4.8.1
Capacitor Placement
Decoupling capacitors should be placed as close to the DAC as possible, with the low value ceram-
ic capacitor being the closest. To further minimize impedance, these capacitors should be located
on the same layer as the DAC. If desired, all supply pins may be connected to the same supply, but
a decoupling capacitor should still be placed on each supply pin.
Notes: All decoupling capacitors should be referenced to analog ground.
The CDB4351 evaluation board demonstrates the optimum layout and power supply arrangements.
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DS566PP2
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