Rainbow Electronics AT84AD004 - Manual (Page 48)

48
AT84AD004
5390A–BDC–06/04
Using the AT84AD004 Dual 8-bit 500 Msps ADC
Decoupling, Bypassing
and Grounding of Power
Supplies The following figures show the recommended bypassing, decoupling and grounding
schemes for the dual 8-bit 500 Msps ADC power supplies.
Figure 48. V
CCD
and V
CCA
Bypassing and Grounding Scheme
Figure 49. V
CCO
Bypassing and Grounding Scheme
Note: L and C values must be chosen in accordance with the operating frequency of the application.
Figure 50. 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.
1
µ
F
L
PC Board 3.3V
PC Board GND
VCCD
L
C C
VCCA 100 pF
1
µ
F
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