AD9544SLASHPCBZ datasheet(10/62 Pages) AD

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AD9544

Data Sheet

Rev. 0 | Page 10 of 62

TIME DURATION OF DIGITAL FUNCTIONS

Table 9.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

TIME DURATION OF DIGITAL

FUNCTIONS

EEPROM to Register Download

Time

Using the Typical Configuration from Table 3

Power-On Reset (POR)

Time from power supplies > 80% to release of internal reset

Mx Pin to RESETB Rising Edge

Setup Time

Mx refers to Pin M0 through Pin M6

Mx Pin to RESETB Rising Edge

Hold Time

Multiple Mx Pin Timing Skew

Applies only to multibit Mx pin functions

RESETB Falling Edge to Mx Pin

High-Z Time

TIME FROM START OF DPLL

ACTIVATION TO ACTIVE PHASE

DETECTOR OUTPUT

Untagged Operation

tPFD

tPFD is the nominal phase detector period given by R/fREF, where R is the

frequency division factor determined by the R divider, and fREF is the

frequency of the active reference

Tagged Operation

Tag

period

Tag period = (tag ratio/fTAG), where fTAG is either fREF (for tagged reference

mode) or fFEEDBACK (for all other tagged modes); the tag ratio corresponds to

the selection of fTAG

DIGITAL PLL (DPLL0, DPLL1) SPECIFICATIONS

Table 10.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

DIGITAL PLL

Digital Phase Detector (DPD)

Input Frequency Range

2 × 105

Loop Filter

Profile 0

Bandwidth

0.0001

1850

Programmable design parameter; (fPFD/bandwidth) ≥ 20

Phase Margin

Degrees

Closed-Loop Peaking

1.1

Profile 1

Bandwidth

0.0001

305

Programmable design parameter; (fPFD/bandwidth) ≥ 20

Phase Margin

88.5

Degrees

Closed-Loop Peaking

0.1

In accordance with Telcordia GR-253-CORE jitter transfer

specifications

DIGITAL PLL NCO Division Ratio

These specifications cover limitations on the DPLLx frequency

tuning word (FTW0); the AD9544 evaluation software frequency

planning wizard sets these values automatically for the user, and

the AD9544 evaluation software is available for download from

the AD9544 product page; NCO division = 248/FTW0, which takes

the form INT.FRAC, where INT is the integer portion, and FRAC is

the fractional portion

NCO Integer

This is the integer portion of NCO division ratio

NCO Fraction

0.05

0.95

This is the fractional portion of NCO division ratio

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