Rainbow-electronics MAX3679A Manual do Utilizador descarregar pdf (Página 10)

MAX3679A

+3.3V, Low-Jitter Crystal to LVPECL

Clock Generator

10 ______________________________________________________________________________________

MAX3679A

THIN QFN

(5mm

5mm)

TOP VIEW

DDO_A

BYPASS

RES1

QA_C

QB0

QB1

IN_SEL

QB0

REF_IN

X_IN

910

SELB1

12 13 14 15

3132 30 28 27 26

SELB0

QAC_OE

SELA1

SELA0

QA_OE

GND

CCO_A

QB1

GNDO_A

CCA

QB0_OE

QB1_OE

GND

RES0

X_OUT

CCO_B

*EP

*EXPOSED PAD CONNECTED TO GROUND.

Pin Configuration

Layout Considerations

The inputs and outputs are critical paths for the

MAX3679A, and care should be taken to minimize dis-

continuities on these transmission line. Here are some

suggestions for maximizing the MAX3679A’s perfor-

mance:

• An uninterrupted ground plane should be posi-

tioned beneath the clock I/Os.

• Ground pin vias should be placed close to the IC

and the input/output interfaces to allow a return

current path to the MAX3679A and the receive

devices.

• Supply decoupling capacitors should be placed

close to the MAX3679A supply pins.

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

transmission line impedance out of the MAX3679A.

• Use good high-frequency layout techniques and a

multilayer board with an uninterrupted ground

plane to minimize EMI and crosstalk.

Refer to the MAX3679A Evaluation Kit for more information.

Exposed-Pad Package

The exposed pad on the 32-pin TQFN package pro-

vides a very low inductance path for return current trav-

eling to the PCB ground plane. The pad is also

electrical ground on the MAX3679A and must be sol-

dered to the circuit board ground for proper electrical

performance.

Chip Information

TRANSISTOR COUNT: 10,780

PROCESS: BiCMOS

1 2 ... 5 6 7 8 9 10 11

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