TC9470FN

2002-02-27

4

Description of Block Operations

1. Crystal Oscillator Circuit and Timing Generator

The clock required for internal operations is generated by connecting a crystal and condensers as shown

in the diagram below.

The IC will also operate when a system clock is input from an external source through the XI pin (pin 15).

However, in this situation, due consideration must be given to the fact that waveform characteristics, such

as jitter and rising/falling characteristics of the system clock, significantly affect the DA converter’s noise

distortion and the S/N ratio.

The timing generator generates the clocks and process timing signals required for such functions as

digital filtering and de-emphasis filtering.

Figure 1 Crystal Oscillator Circuit Configuration (when in the 384 fs mode)

To internal circuit

GNDX

16.9344 MHz

XI

X’tal

MCK

Use a crystal with a low CI value and favorable start-up characteristics.