SPC56AP54X datasheet(74/104 Pages) STMICROELECTRONICS

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Electrical characteristics

SPC56xP54x, SPC56xP60x

74/104

Doc ID 18340 Rev 3

3.14

16 MHz RC oscillator electrical characteristics

3.15

Analog-to-Digital converter (ADC) electrical characteristics

The device provides a 10-bit Successive Approximation Register (SAR) Analog-to-Digital

Converter.

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

Self clocked mode frequency is the frequency that the PLL operates at when the reference frequency falls outside the fLOR

window.

fVCO self clock range is 20–150 MHz. fSCM represents fSYS after PLL output divider (ERFD) of 2 through 16 in enhanced

mode.

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

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 PLL circuitry via VDDPLL and VSSPLL and variation in crystal oscillator frequency increase the CJITTER

percentage for a given interval.

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

Values are obtained 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).

Short term jitter is measured on the clock rising edge at cycle n and cycle n+4.

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

PLL, load capacitors should not exceed these limits.

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

synthesizer control register (SYNCR).

12. This value is true when operating at frequencies above 60 MHz, otherwise fCS is 2% (above 64 MHz).

13. Modulation depth will be attenuated from depth setting when operating at modulation frequencies above 50 kHz.

Table 31.

16 MHz RC oscillator electrical characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fRC

RC oscillator frequency

TA = 25 °C

—

MHz



RCMVAR

Fast internal RC oscillator variation

over temperature and

supply with respect to f

RC at TA = 25 °C

in high-frequency configuration

—–6

—



RCMTRIM

Post Trim Accuracy: The variation of

the PTF(1) from the 16 MHz

TA = 25 °C

–1

—



RCMSTEP

Fast internal RC oscillator trimming

step

TA = 25 °C

—

1.6

—

PTF = Post Trimming Frequency: The frequency of the output clock after trimming at typical supply voltage and

temperature

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