MUX isolation

Yx, if MUX selects active input signal

Yx, if MUX selects static input signal

Frequency [MHz]

f

carrier

Differential input

SE input

Output enable OE

Output Yx

t

3

t

4

or

X_INP

X_INN

X_INP

CDCLVC1310

www.ti.com

SCAS917E – JULY 2011 – REVISED JANUARY 2014

If the outputs are in the high-impedance state, pulling OE to HIGH forces all outputs LOW asynchronously (t3).

Within two clock cycles (maximum), the outputs start switching again (t4), after a falling edge of the input signal

(see Figure 17).

Figure 17. OE: Enable Outputs

If the outputs are in the high-impedance state and the input is static (no clock signal), OE works fully

asynchronously. A transition of OE from LOW to HIGH forces the outputs to LOW. A transition from HIGH to

LOW does not force to the high-impedance state again. Therefore, a state change requires a falling edge of the

input signal (see Figure 16).

MUX Isolation

The definition of MUX isolation is the difference in output amplitude (dB) between an active and a static input

signal.

Figure 18. Output Spectrum of an Active and a Static Input Signal

Copyright © 2011–2014, Texas Instruments Incorporated

Submit Documentation Feedback

17

Product Folder Links: CDCLVC1310