MPC92433 datasheet(17/20 Pages) FREESCALE

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Advanced Clock Drivers Devices

Freescale Semiconductor

MPC92433

Jitter Performance of the MPC92433

Figure 8 and Figure 9 illustrate the RMS jitter performance

of the MPC92433 across its specified VCO frequency range.

For some output dividers N, the cycle-to-cycle and period

jitter is a function of the VCO frequency and the output divider

N. The general trend is that as the output frequency

increases (higher VCO frequency and lower N-divider) the

MPC92433 output jitter decreases. Optimum jitter

performance can be achieved at higher VCO and output

frequencies.

For the output dividers of N=2, 4 and 6 the cycle-to-cycle

jitter does not depend on the VCO frequency. For the output

dividers of 2, 4 and 8 the period jitter does not depend on the

VCO frequency. The maximum cycle-to-cycle and period jitter

published in Table 6 (AC characteristics) correspond to the

jitter performance at the lowest VCO frequency limit. The

VCO frequency can be calculated using formula (2).

AC Test Reference and Output Termination

The MPC92433 LVPECL outputs are designed to drive

50 transmission lines and require a DC termination to

VTT =VCC –2 V. Figure 10 illustrates the AC test reference

for the MPC92433 as used in characterization and test of this

circuit. If a separate termination voltage (VTT) is not available,

applications may use alternative output termination methods

such as shown in Figure 11 and Figure 12.

The high-speed differential output signals of the

MPC92433 are incompatible to single-ended LVCMOS

signals. In order to use the synthesizer in LVCMOS clock

signal environments, the dual-channel translator device

MC100ES60T23 provides the necessary level conversion.

The MC100ES60T23 has been specifically designed to

interface with the MPC92433 and supports clock frequencies

up to 300 MHz.

Figure 8. MPC92433 Cycle-to-Cycle Jitter

Figure 9. MPC92433 Period Jitter

Figure 10. MPC92433 AC Test Reference

Z = 50

Ω

RT = 50 Ω

Z = 50

Ω

RT = 50 Ω

VTT

Z = 50

Ω

Pulse

Generator

Z = 50

Ω

fREF = 16 MHz

Synthesizer

DUT MPC92433

MPC92433 Datasheet(PDF) 17 Page - Freescale Semiconductor, Inc

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