TC9470FN Datasheet, PDF (4/19 Pages) Toshiba Semiconductor – Modulation DA Converter with Built-in 8-Times Oversampling Digital Filter/Dynamic Digital Bass Boost/Analog Filter

TC9470FN
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.
To internal circuit
GNDX
C_L
XI
X’tal
XO V_DX MCK
16.9344 MHz
C_{L CL = 10 to 33 pF}
Use a crystal with a low CI value and favorable start-up characteristics.
Figure 1 Crystal Oscillator Circuit Configuration (when in the 384 fs mode)
The timing generator generates the clocks and process timing signals required for such functions as
digital filtering and de-emphasis filtering.
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2002-02-27