AD9557SLASHPCBZ datasheet(8/92 Pages) AD

8 / 92 page

AD9557

Data Sheet

Rev. A | Page 8 of 92

REFERENCE MONITORS

Table 8.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

REFERENCE MONITORS

Reference Monitor

Loss of Reference Detection Time

1.1

DPLL PFD

period

Nominal phase detector period = R/fREF 1

Frequency Out-of Range Limits

105

Δf/fREF

(ppm)

Programmable (lower bound is subject to quality

of the system clock (SYSCLK)); SYSCLK accuracy

must be better than the lower bound

Validation Timer

0.001

65.535

sec

Programmable in 1 ms increments

1 fREF is the frequency of the active reference; R is the frequency division factor determined by the R divider.

REFERENCE SWITCHOVER SPECIFICATIONS

Table 9.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

REFERENCE SWITCHOVER SPECIFICATIONS

Maximum Output Phase Perturbation

(Phase Build-Out Switchover)

Assumes a jitter-free reference; satisfies

Telcordia GR-1244-CORE requirements; select

high PM base loop filter bit (Register 0x070E, Bit 0)

is set to 1 for all active references

50 Hz DPLL Loop Bandwidth

Valid for automatic and manual reference

switching

Peak

±100

Steady State

±100

2 kHz DPLL Loop Bandwidth

Valid for automatic and manual reference

switching

Peak

±250

Steady State

±100

Time Required to Switch to a New Reference

Phase Build-Out Switchover

1.1

DPLL PFD

period

Calculated using the nominal phase detector

period (NPDP = R/fREF); the total time required is

equal to the time plus the reference validation

time and the time required to lock to the new

reference

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