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