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TDA7529 Fiches technique(PDF) 15 Page - STMicroelectronics |
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TDA7529 Fiches technique(HTML) 15 Page - STMicroelectronics |
15 / 60 page TDA7529 Function description 15/60 3.7 VCO The 3.7 GHz VCO has an internal switch that allows extending the oscillation frequency range. This is required by the fact that each of the two resulting VCO sub-bands (upper/lower) cannot individually cover the complete required frequency range versus temperature and process; for this reason a calibration procedure is needed to determine the process type (typical, slow, fast) and select the transition frequency between the two VCO sub-bands. To run the procedure the VCO range 2 must be selected, the synthesized frequency needs to be set to 4GHz; then if Vtuning > 2.6V then the process is 'slow', if Vtuning < 1.7V then is 'fast' and otherwise is 'typical'. The switching frequency as a function of the process is reported in the following table: 3.8 FREF The reference frequency for the PLL can be derived by a XTAL directly connected to the device or by means of an LVDS signal. In the latter case an external matching resistor must be used to obtain the desired input signal level. 3.9 A/D converter The front-end contains a 6 bit SAR A/D-converter for sensing several analog values of the tuner. The following analog sources can be switched to the ADC input by software command: ● FM RF AGC capacitor voltage ● AM RF AGC capacitor voltage ● IF AGC capacitor voltage (automatically connected to the FM or AM IF AGC filtering capacitor) ● PLL tuning voltage ● Temperature sensor ● GPIO 1 voltage ● GPIO 2 voltage ● ADC reference generated from VCC. The ADC can be clocked by an integrated RC-oscillator, in which case the oscillation frequency is programmable, or by the PLL reference frequency. Table 4. Switching frequency as a function of the process SLOW TYP FAST 3.635GHz 3.72GHz 3.794GHz |
Numéro de pièce similaire - TDA7529 |
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Description similaire - TDA7529 |
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