MPC9772 datasheet(7/16 Pages) MOTOROLA

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MPC9772

TIMING SOLUTIONS

MOTOROLA

tJIT(∅)

I/O Phase Jitter RMS (1

σ)12

÷4 feedback

÷6 feedback

÷8 feedback

÷10 feedback

÷12 feedback

÷16 feedback

÷20 feedback

÷24 feedback

÷32 feedback

÷40 feedback

(VCO=400 MHz)

PLL closed loop bandwidth13

÷4 feedback

÷6 feedback

÷8 feedback

÷10 feedback

÷12 feedback

÷16 feedback

÷20 feedback

÷24 feedback

÷32 feedback

÷40 feedback

1.20 –

3.50

0.70 –

2.50

0.50 –

1.80

0.45 –

1.20

0.30 –

1.00

0.25 –

0.70

0.20 –

0.55

0.17 –

0.40

0.12 –

0.30

0.11 –

0.28

MHz

tLOCK

Maximum PLL Lock Time

AC characteristics apply for parallel output termination of 50

Ω to V

TT.

In bypass mode, the MPC9772 divides the input reference clock.

The input reference frequency must match the VCO lock range divided by the total feedback divider ratio: fREF= fVCO ÷ (M ⋅ VCO_SEL).

The crystal frequency range must both meet the interface frequency range and VCO lock range divided by the feedback divider ratio:

fXTAL(min, max) = fVCO(min, max) ÷ (M ⋅ VCO_SEL) and 10 MHz ≤ fXTAL ≤ 25 MHz.

Calculation of reference duty cycle limits: DCREF,MIN = tPW,MIN ⋅ fREF ⋅ 100% and DCREF,MAX = 100% – DCREF, MIN.

The MPC9772 will operate with input rise/fall times up to 3.0 ns, but the A.C. characteristics, specifically t(∅), tPW,MIN, DC and fMAX can only be

guaranteed if tR, tF are within the specified range.

Static phase offset depends on the reference frequency. t(∅) [s] = t(∅) [°] ÷ (fREF ⋅ 360°).

Excluding QSYNC output. See application section for part-to-part skew calculation.

Output duty cycle is DC = (0.5

± 200 ps ⋅ f

OUT)

⋅ 100%. E.g. the DC range at fOUT = 100 MHz is 48%<DC<52%. T = output period.

10. Cycle jitter is valid for all outputs in the same divider configuration. See application section for more details.

11. Period jitter is valid for all outputs in the same divider configuration. See application section for more details.

12. I/O jitter is valid for a VCO frequency of 400 MHz. See application section for I/O jitter vs. VCO frequency.

13. –3 dB point of PLL transfer characteristics.

Table 10. AC Characteristics (VCC = 3.3V ± 5%, TA = –40° to +85°C)

1 2 (Continued)

Symbol

Characteristics

Min

Typ

Max

Unit

Condition

TA = 0°C

to +70°C

TA = –40°C

to +85°C

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