6
AV9110
Figure 1 - Serial Programming
AC Timing
Frequency Acquisition Time
Frequency acquisition (or “lock”) time is the time that it
takes to change from one frequency to another, and is a
function of the difference between the old and new
frequencies. The AV9 11 0 can typically lock to within 1% of
a new frequency in less than 200 microseconds. This is also
true with power-on.
Power-On Reset
Upon power-up the internal latches are preset to provide the
following output clock frequencies (14.318 MHz reference
assumed):
Device CLK output CLK/X output
AV9110-01 25.175 MHz 6.29 MHz
AV9110-02 25.175 MHz 12.59 MHz
These preset default frequencies can be changed with a custom
metal mask, as can other attributes.
The actual numbers of these output clock frequencies
(14.318MHz reference assumed) are:
Device CLK output CLK/X output
AV9110-01 25.255 MHz 6.31 MHz
AV9110-02 25.255 MHz 12.63 MHz
and these are within 0.32%.
Jitter
For high performance applications, the AV9110 offers ex-
tremely low jitter and excellent power supply rejection. The
one sigma jitter distribution is typically less than ±125ps.
For optimum performance, the device should be decoupled
with both a 2.2mF and a 0.1mF capacitor. Refer to
Recommended Board Layout diagram on page 8.
Output Enable
The AV9110 outputs can be disabled with either the OE pin
or through serial programming. Setting the OE pin low tristates
CLK and CLK/X. Alternatively, setting bits D19 and D20
low in the serial word will tristate the two outputs. Both the
OE pin and D19 or D20 must be high to enable an output.
Frequency Transition Glitches
The AV9110 starts changing frequency on the rising edge of
the 24th serial clock. If the programming of any output
divider is changed, the output clock may glitch before locking
to the new frequency in less than 200µs with no output
glitches (no partial clock cycles).
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