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Rainbow-electronics MAX107 Manual de usuario Pagina 17

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capacitor, to filter power supply noise, in parallel with a
0.1µF capacitor. A combination of 0.01µF in parallel
with high quality 47pF ceramic chip capacitor located
very close to the MAX107 device filters high frequency
noise. A properly designed PC board (see MAX105EV
Kit data sheet) allows the user to connect all analog
supplies and all digital supplies together thereby
requiring only two separate power sources. Decoupling
AV
CC
, AV
CC
I, AV
CC
Q and AV
CC
R with ferrite-bead
suppressors prevents further crosstalk between the
individual analog supply pins
Thermal Management
The MAX107 is designed for a thermally enhanced 80-
pin TQFP package, providing greater design flexibility,
increased thermal efficiency and a low thermal junc-
MAX107
Dual, 6-Bit, 400Msps ADC with On-Chip,
Wideband Input Amplifier
______________________________________________________________________________________ 17
AV
CC
Q
AV
CC
AGNDR
AGND
AGNDI
AGNDQ
AV
CC
Q
AV
CC
AGND
AGNDQ
AGNDI
AGNDR
AV
CC
I
PC BOARD AV
CC
PC BOARD OV
CC
PC BOARD AGND FERRITE-BEAD
SUPPRESSORS
PC BOARD OGND
AV
CC
RAV
CC
R
AV
CC
I
OV
CC
Q
OV
CC
Q
OGNDQ
OGNDQ
OGNDI
OGNDI
OV
CC
I
OV
CC
I, OV
CC
Q
OV
CC
I
OV
CC
Q
OV
CC
Q
OGNDQ
OGNDQ
OGNDI
OGNDI
OV
CC
I
OV
CC
I
NOTE:
LOCATE ALL 47pF AND 10nF CAPACITORS, WHICH DECOUPLE AV
CC
I, AV
CC
Q, AV
CC
R, OV
CC
I, AND OV
CC
Q AS CLOSE
AS POSSIBLE TO THE CHIP. IT IS ALSO RECOMMENDED TO CONNECT ALL ANALOG GROUND CONNECTIONS TO A COMMON ANALOG
GROUND PLANE AND ALL DIGITAL GROUND CONNECTIONS TO ONE COMMON DIGITAL GROUND PLANE ON THE PC BOARD. A SIMILAR
TECHNIQUE CAN BE USED FOR ALL ANALOG AND DIGITAL POWER SUPPLIES.
AV
CC
= AV
CC
I = AV
CC
Q = AV
CC
R = +5V±5%
OV
CC
I = OV
CC
Q = +3.3V±10%
10nF
47pF
4 x 10nF
10nF
47pF
10µF
10nF
10µF
10nF
10nF
47pF
10nF
10nF
10nF
10nF
10nF
47pF
47pF
47pF
47pF
47pF
MAX107
Figure 9. MAX107 Decoupling, Bypassing and Grounding
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