7
AV9110
AV9110 Quartz Crystal Selection
When an external quartz crystal will be used as a frequency
reference for the AV9110, attention needs to be given to
crystal selection if accurate reference frequency and output
frequency is desired. The AV9110 uses a Pierce oscillator
design which operates the quartz crystal in parallel-resonant
mode. It requires a quartz crystal cut for parallel-resonant
operation to ensure an accurate frequency of oscillation (a
less expensive series-reso-nant crystal can be used with the
device but it will oscillate approximately 0.1% too fast). The
AV9110-01 has internal crystal load capacitors which result
in a total crystal load capacitance of approximately
12pF±10%.The AV9110-02 does not have internal load
capacitors, but contributes about 3pFload capacitance to the
crystal.
Following is a list of recommended crystal devices for the
AV9110. They have been tested by the crystal manufacturer
to operate suitably with the AV91xx-series crystal oscillator
de-sign, having load capacitance characteristics that are
compatible with the AV9110-01.
Toyocom
Part Number
TN4-30374 ........ 14.318 MHz surface mount crystal
TN4-30375 ........ 20 MHz surface mount crystal
TN4-30376 ........ 14.318 MHz through-hole crystal
TN4-30377 ........ 20 MHz through-hole crystal
Epson
Part Number
MA-505 or ......... Surface mount crystal
MA-506
CA-301 .............. Through-hole crystal
Using AV9110-01 with a crystal Using AV9110-01 with an external clock
Using AV9110-02 with a crystal Using AV9110-02 with an external clock
Figure 2 - Clock Reference Combinations
