TDA7479DTR Datasheet, PDF (8/12 Pages) STMicroelectronics – Single chip RDS demodulator + filter

Oscillator controls (FSEL, OSEL)
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Oscillator controls (FSEL, OSEL)
TDA7479
Three different crystal frequencies can be used. The adoption of the internal clock divider to
the external crystal is achieved via the input pin FSEL. See the following table for reference:
Table 6. Crystal frequencies
Crystal
FSEL (pin configuration)
4.332MHz
8.664MHz
17.328MHz
connected to GND or open connected to Vs external resistor of 100K to Vs
A special mode is introduced to reduce EMI. With pin OSEL connected to GND the internal
oscillator is switched off and an external sinusoidal frequency could be applied on OSCIN.
The peak to peak voltage of this signal can be reduced down to 60mV.
In this mode the frequency selection via FSEL is still active.
Suggested values of C1 and C2 are shown in the following table:
Table 7. C1 and C2 value
Crystal
4.332MHz
8.664MHz
17.328MHz
C1
27pF
27pF
27pF
C2
47pF
-
-
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