Rainbow-electronics MAX3622 Bedienungsanleitung PDF herunterladen (Seite 8)

Layout Considerations

The inputs and outputs are critical paths for the

MAX3622, and care should be taken to minimize dis-

continuities on these transmission lines. Here are some

suggestions for maximizing the MAX3622’s perfor-

mance:

• An uninterrupted ground plane should be posi-

tioned beneath the clock I/Os.

• Supply and ground pin vias should be placed

close to the IC and the input/output interfaces to

allow a return current path to the MAX3622 and the

receive devices.

• Supply decoupling capacitors should be placed

close to the MAX3622 supply pins.

• Maintain 100Ω differential (or 50Ω single-ended)

transmission line impedance out of the MAX3622.

• Use good high-frequency layout techniques and a

multilayer board with an uninterrupted ground

plane to minimize EMI and crosstalk.

Refer to the MAX3622 Evaluation Kit for more information.

MAX3622

Low-Jitter, Precision Clock Generator

with Two Outputs

8 _______________________________________________________________________________________

MAX3622

CCA

QAC_OE

QB_OE

QA_C

X_OUT

X_IN GNDO_AGND

CCO_B

DDO_A

10.5Ω

0.01μF

0.1μF

36Ω

= 50Ω

ASIC

125MHz

50Ω

= 50Ω

ASIC

50Ω

156.25MHz

- 2V)

10μF

0.1μF

25MHz

= 18pF)

33pF 27pF

0.01μF 0.1μF

+3.3V ±5%

Typical Application Circuit

1 2 3 4 5 6 7 8 9

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