SPC56EL54X datasheet(119/165 Pages) STMICROELECTRONICS

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SPC56ELx, SPC564Lx

Electrical characteristics

164

3.15

16 MHz RC oscillator electrical characteristics

3.16

ADC electrical characteristics

The device provides a 12-bit Successive Approximation Register (SAR) Analog-to-Digital

Converter.

2. With FM; the value does not include a possible +2% modulation

3. “Loss of Reference Frequency” window is the reference frequency range outside of which the FMPLL is in self clocked

mode.

4. Self clocked mode frequency is the frequency that the FMPLL operates at when the reference frequency falls outside the

fLOR window.

5. fVCO is the frequency at the output of the VCO; its range is 256–512 MHz.

fSCM is the self-clocked mode frequency (free running frequency); its range is 20–150 MHz.

fSYS = fVCOODF

6. This value is determined by the crystal manufacturer and board design. For 4 MHz to 20 MHz crystals specified for this

FMPLL, load capacitors should not exceed these limits.

7. This specification applies to the period required for the FMPLL to relock after changing the MFD frequency control bits in

the synthesizer control register (SYNCR).

8. This value is determined by the crystal manufacturer and board design.

9. Jitter is the average deviation from the programmed frequency measured over the specified interval at maximum fSYS.

Measurements are made with the device powered by filtered supplies and clocked by a stable external clock signal. Noise

injected into the FMPLL circuitry via VDDPLL and VSSPLL and variation in crystal oscillator frequency increase the CJITTER

percentage for a given interval.

10. Proper PC board layout procedures must be followed to achieve specifications.

11. Values are with frequency modulation disabled. If frequency modulation is enabled, jitter is the sum of CJITTER and either

fCS or fDS (depending on whether center spread or down spread modulation is enabled).

12. Modulation depth is attenuated from depth setting when operating at modulation frequencies above 50 kHz.

Table 26. 16 MHz RC oscillator electrical characteristics

Symbol

Parameter

Conditions

Value

Unit

Min

Typ

Max

fRC

P RC oscillator frequency

TA = 25 °C

—

MHz



RCMVAR

Fast internal RC oscillator variation over

temperature and supply with respect to fRC at

TA = 25 °C in high-frequency configuration

—

6—

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