Differential input

SE input

Output enable OE

Output Yx

t

3

t

4

or

X_INP

X_INN

X_INP

MUX isolation

Yx, if MUX selects active input signal

Yx, if MUX selects static input signal

Frequency [MHz]

f

carrier

CDCLVC1310

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SCAS917B

– JULY 2011 – REVISED FEBRUARY 2012

If the outputs are in the high-impedance state and OE is pulled to HIGH, all outputs are forced to 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 falling edge of the input signal is needed

(see Figure 16).

MUX Isolation

MUX isolation is defined as difference in output amplitude (dB) with an active or a static input signal.

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

Copyright

© 2011–2012, Texas Instruments Incorporated

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