26 Mhz Clock (Crystal, X500); Only For Training And Service Purposes - LG KP235 Service Manual

3.3 26 MHz Clock (Crystal, X500)

The 26 MHz clock (X500) consists of a TCXO (Crystal Oscillator) which oscillates at a frequency of 26 MHz. The
AD6548 requires only an external low cost crystal as the frequency reference. The circuitry to oscillate the crystal
and tune its frequency is fully integrated. The Oscillator is a balanced implementation requiring the crystal to be
connected across 2 pins. There is a programmable capacitor array included for coarse tuning of fixed offsets (e.g.
crystal manufacturing tolerance), and an integrated varactor for dynamic control. The oscillator is designed for use
with a 26MHz crystal. Dedicated control software ensures excellent frequency stability under all circumstances.
Copyright © 2008 LG Electronics. Inc. All right reserved.

Only for training and service purposes

X500
3 4
2 1
26MHz
TSX-3225_26MHZ
Figure 3.4 CRYSTAL CIRCUIT DIAGRAM
- 19 -
3. TECHNICAL BRIEF
LGE Internal Use Only