ICS843002AGLFT datasheet(10/16 Pages) ICST

Part #	ICS843002AGLFT

Description	FEMTOCLOCKS??CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER

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Manufacturer	ICST [Integrated Circuit Systems]

Direct Link	http://www.icst.com

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10 / 16 page

843002AG

www.icst.com/products/hiperclocks.html

REV. B MAY 6, 2005

10

Integrated

Circuit

Systems, Inc.

ICS843002

FEMTOCLOCKS™ CRYSTAL-TO-

3.3V LVPECL FREQUENCY SYNTHESIZER

LAYOUT GUIDELINE

Figure 4A shows a schematic example of the ICS843002. An

example of LVEPCL termination is shown in this schematic.

Additional LVPECL termination approaches are shown in the

LVPECL Termination Application Note. In this example, an 18 pF

FIGURE 4A. ICS843002 SCHEMATIC EXAMPLE

parallel resonant 26.5625MHz crystal is used. The C1=27pF

and C2=33pF are recommended for frequency accuracy. For

different board layout, the C1 and C2 may be slightly adjusted

for optimizing frequency accuracy.

FIGURE 4B. ICS843002 PC BOARD LAYOUT EXAMPLE

C1

27pF

VCC

VCCO

Zo = 50 Ohm

R6

50

C6

0.1u

C4

0.01u

X1

26.5625 MHz

VCC=3.3V

18pF

To Logic

Input

pins

C7

0.1u

Zo = 50 Ohm

RU1

1K

To Logic

Input

pins

C9

0.1u

Set Logic

Input to

'1'

VCCO=3.3V

VCC

R5

50

U1

ICS843002

VCC

VCCO

RD2

1K

VCCA

R4

50

C3

10uF

Zo = 50 Ohm

RD1

Not Install

R2

10

Set Logic

Input to

'0'

Zo = 50 Ohm

+

-

C8

0.1u

R7

50

Logic Control Input Examples

R9

50

C2

33pF

R8

50

+

-

RU2

Not Install

PC BOARD LAYOUT EXAMPLE

Figure 4B shows an example of ICS843002 P.C. board layout.

The crystal X1 footprint shown in this example allows installa-

tion of either surface mount HC49S or through-hole HC49 pack-

age.The footprints of other components in this example are listed

in the

Table 6. There should be at least one decoupling capacitor

per power pin. The decoupling capacitors should be located as

close as possible to the power pins. The layout assumes that

the board has clean analog power ground plane.

TABLE 6. FOOTPRINT TABLE

e

c

n

e

r

e

f

e

Re

z

i

S

2

C

,

1

C2

0

4

0

3

C5

0

8

0

8

C

,

7

C

,

6

C

,

5

C

,

4

C3

0

6

0

2

R3

0

6

0

s

e

z

i

s

t

n

e

n

o

p

m

o

c

s

t

s

il

,

6

e

l

b

a

T

:

E

T

O

N

.

e

l

p

m

a

x

e

t

u

o

y

a

l

s

i

h

t

n

i

n

w

o

h

s

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