50
AT84AD001B
2153C–BDC–04/04
Using the AT84AD001B Dual 8-bit 1 Gsps ADC
Decoupling, Bypassing
and Grounding of Power
Supplies
The following figures show the recommended bypassing, decoupling and grounding
schemes for the dual 8-bit 1 Gsps ADC power supplies.
Figure 53. V
CCD
and V
CCA
Bypassing and Grounding Scheme
Figure 54. V
CCO
Bypassing and Grounding Scheme
Note: L and C values must be chosen in accordance with the operation frequency of the application.
Figure 55. Power Supplies Decoupling Scheme
Note: The bypassing capacitors (1 µF and 100 pF) should be placed as close as possible to the board connectors, whereas the
decoupling capacitors (100 pF and 10 nF) should be placed as close as possible to the device.
1µF
L
PC Board 3.3V
PC Board GND
VCCD
L
C
C
VCCA
100 pF
1µF
L
PC Board 2.25V
PC Board GND
VCCO
C
100 pF
VCCA
GNDA
VCCO
GNDO
GNDA
GNDD
GNDO
VCCD
VCCA
VCCO
100 pF
100 pF 10 nF
10 nF
100 pF
10 nF
