ML7406 Family LSIs Hardware Design Manual
FEXL7406DG-01
4
2.1.2. Notes on the crystal oscillator circuit configuration
Note the following when designing the crystal oscillator circuit.
1.
The capacitors value of C1 and C2 depends on the crystal oscillator specification.
2.
C1 and C2 should be placed as close as possible to the XIN (#5) and the XOUT (#6) pins to suppress
parasitic LCR and stabilize the oscillator.
3.
The 26 MHz reference clock should keep accuracy within ±20ppm under all condition including
temperature variations, power supply voltage variation and aging changes.
4.
Do not place the crystal oscillator circuit across other signal lines.
5.
Do not trace signal lines where large current flow around the crystal oscillator circuit.
6.
For the oscillator circuit capacitors, make sure the potential of the ground points is always equal to that
of the GND. Do not connect the capacitors to GNDs where large current flow.
7.
Do not take oscillation signals from the oscillator circuit.
8.
Oscillation frequency is changed by variation value of ESR (Equivalent Series Resistance) in crystal.
Oscillation frequency can be adjusted by [OSC_ADJ2] register (B0 0x63).