TDA5150 Datasheet, PDF (34/106 Pages) Infineon Technologies AG – On-chip, high resolution fractional-N synthesizer and Sigma-Delta modulator with ASK, FSK, GFSK options

TDA 5150
TDA 5150 Functional Description
• If SDIO = 1 when EN goes High, the output clock is selected as imposed by settings
of SFR CLKOUTCFG (0x06). This is the configurator register for Clock pre- and
afterscaler. Detailed description of the bit-fields is given in next Chapter 2.4.5.3
SFRs related to Crystal Oscillator and Clock Divide
If enabled, the CLKOUT starts toggling when the swing amplitude on crystal oscillator
output reaches a certain threshold.
If disabled, no clock signal is output on CLKOUT, but it delivers a rising edge pulse and
stays high, signalizing that the crystal oscillator output already reached a stable level
Note: If the CLKOUT line is used as system clock for a µC, keep in mind that in
Synchronous Transmission Mode the delivered frequency is not highly stable in
phase (it is affected by jitter), due to the fact that the related counters are
synchronized with each Transmit Command. The reasons for it and the
synchronization procedure itself are explained in Chapter 2.4.11.2 Synchronous
Transmission.
Data Sheet
34
V 1.0, July 2009