SI5325C-C-GM Datasheet, PDF(95/178 Page) Silicon Laboratories – ANY-FREQUENCY PRECISION CLOCKS

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SI5325C-C-GM Datasheet, PDF (95/178 Pages) Silicon Laboratories – ANY-FREQUENCY PRECISION CLOCKS

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Si53xx-RM

Si53xx

C

CML/

LVDS

Driver

100 ï

C

40 kï

40 kï

CKIN +

300 ï

CKIN _

Â± VICM

Figure 39. CML/LVDS Termination (1.8, 2.5, 3.3 V)

50 ï

50 ï

Driver

Receiver

Figure 40. Center Tap Bypassed Termination

Figure 40 is recommended over a single 100 ï resistor whenever greater reduction of common-mode noise is

desired. It can be used with any differential termination, either input or output.

CMOS Driver

VDD

R1

33 ohms

VDD

R2

Notes

VDD

VDD

Si53xx

R3

50

150 ohms

R2

VICM

See Table

C1 CKIN+ R5 40 kohm

R4

150 ohms

100 nF

CKINâ

C2

R6 40 kohm

100 nF

3.3 V

2.5 V

1.8 V

100 ohm

49.9 ohm

14.7 ohm

Locate R1 near CMOS driver

Locate other components near Si5317

Recalculate resistor values for other drive strengths

Additional Notes:

1. Attenuation circuit limits overshoot and undershoot.

2. Use only with ~50% duty cycle clock signals.

3. Assumes the CMOS output can drive 8 mA.

Figure 41. CMOS Termination (1.8, 2.5, 3.3 V)

Rev. 1.2

95

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