Crystal

C

1

C

2

XIN

XOUT

R

OPTIONAL

VDD

R

INT

Clock Generator:

VDD

XIN

XOUT

R

+ R = 50

INT

s

W

R = 100

1

W

C = 0.1 F

m

Z = 50

o

W

R = 100

2

W

CDCLVC1310

SCAS917B

– JULY 2011 – REVISED FEBRUARY 2012

www.ti.com

Figure 12. Crystal Reference Input

The input XIN can accept single-ended LVCMOS signals in two configurations. It is possible to overdrive the

oscillator stage or to use a pure LVCMOS input (see Table 1). If the oscillator stage is overdriven, the input must

be ac-coupled with a capacitor (see Figure 13). Otherwise, if the bypass mode is selected, a coupling capacitor

is not required.

NOTE

If overdrive or bypass mode is used, the device is functional, but the ac parameters may

not be met.

Figure 13. Single-Ended Crystal Input

Phase Noise Performance

The CDCLVC1310 provides ultralow phase-noise outputs (noise floor =

–170 dBc/Hz) if a crystal is attached to it.

room temperature.

14

Submit Documentation Feedback

Copyright

© 2011–2012, Texas Instruments Incorporated

Product Folder Link(s): CDCLVC1310