AD9577BCPZ-R7 datasheet(43/44 Pages) AD

43 / 44 page

Data Sheet

AD9577

Rev. 0 | Page 43 of 44

VSCA

VSI2C

REFOUT

VSREFOUT

VSX

REFCLK

XT2

XT1

REFSEL

VSCB

OUT3P

VSFB

VSM

SSCG

VSFA

OUT1N

OUT1P

VSOB1A

OUT3N

VSOB3B

AD9577

22pF

220nF

DO NOT CONNECT OTHER TRACES

TO PIN 15, PIN 16, PIN 35, AND PIN 36.

CAPACITORS CD CONSIST OF

100nF IN PARALLEL WITH 10nF.

10kΩ

50Ω

127Ω

83Ω

127Ω

83Ω

127Ω

83Ω

127Ω

83Ω

127Ω

83Ω

127Ω

83Ω

50Ω

127Ω

83Ω

127Ω

83Ω

Figure 50. Typical LVPECL Application Circuit

POWER AND GROUNDING CONSIDERATIONS AND POWER SUPPLY REJECTION

Many applications seek high speed and performance under less

than ideal operating conditions. In these application circuits,

the implementation and construction of the PCB is as important

as the circuit design. Proper RF techniques must be used for

device selection, placement, and routing, as well as for power

supply bypassing and grounding to ensure optimum performance.

Each power supply pin should have independent decoupling and

connections to the power supply plane. It is recommended that the

device exposed paddle be directly connected to the ground plane

by a grid of at least nine vias. Care should be taken to ensure that

the output traces cannot couple onto the reference or crystal input

circuitry.

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