Specifications

AMBE-3000™ Vocoder Chip Users Manual

Version 2.8, August, 2011

ardware Information

2.7.2 Crystal Oscillator

To use a crystal oscillator with the AMBE-3000™ Vocoder Chip, connect the crystal across X1/XCLKIN and X2 along with

one external capacitor from each of these pins to ground.

Figure 8 X1/XCLKIN and X2 with Crystal Oscillator

NOTE A: It is recommended that the resonator/crystal vendor characterize the operation

of their device with the chip. The resonator/crystal vendor has the equipment and

expertise to tune the tank circuit. The vendor can also advise regarding the proper tank

component values that will ensure start up and stability over the entire operating range.

The typical specifications for the external quartz crystal for a frequency of 30 MHz are listed below:

 Fundamental mode, parallel resonant

 CL (load capacitance) = 12 pF

 C

= C

= 24 pF

 Cshunt = 6 pF

 ESR range = 25 to 40 Ohms

(Subject to Change) Page 19

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