AD9547SLASHPCBZ datasheet(8/104 Pages) AD

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AD9547

Rev. 0 | Page 8 of 104

REFERENCE SWITCHOVER SPECIFICATIONS

Table 10.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

MAXIMUM OUTPUT PHASE

PERTURBATION (PHASE BUILD-OUT

SWITCHOVER)

200

Assumes a jitter-free reference; satisfies

Telcordia GR-1244-CORE requirements

MAXIMUM TIME/TIME SLOPE

(HITLESS SWITCHOVER)

315

65,535

ns/sec

Minimum/maximum values are program-

mable upper bounds; a minimum value

ensures <10% error; satisfies Telcordia

GR-1244-CORE requirements

TIME REQUIRED TO SWITCH TO A NEW

REFERENCE

Hitless Switchover

NPDP

NPDP = nominal phase detector period

(NPDP = fREF/R)1

Phase Build-Out Switchover

NPDP

NPDP = nominal phase detector period

(NPDP = fREF/R)1

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

DISTRIBUTION CLOCK OUTPUTS (OUT0, OUT1)

Table 11.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

LVPECL MODE

Using internal current setting resistor

(nominal 3.12 kΩ)

Maximum Output Frequency

725

MHz

Rise/Fall Time1 (20% to 80%)

180

315

100 Ω termination across output pins

Duty Cycle

Differential Output Voltage Swing

630

770

910

Magnitude of voltage across pins; output

driver static

Common-Mode Output Voltage

AVDD3 − 1.5

AVDD3 − 1.3

AVDD3 − 1.05

Output driver static

LVDS MODE

Using internal current setting resistor

(nominal 3.12 kΩ)

Maximum Output Frequency

725

MHz

Rise/Fall Time1 (20% to 80%)

200

350

100 Ω termination across the output pins

Duty Cycle

Differential Output Voltage Swing

Balanced (VOD)

247

454

Voltage swing between output pins;

output driver static

Unbalanced (ΔVOD)

Absolute difference between voltage

swing of normal pin and inverted pin;

output driver static

Offset Voltage

Common Mode (VOS)

1.125

1.375

Output driver static

Common-Mode Difference (ΔVOS)

Voltage difference between pins; output

driver static

Short-Circuit Output Current

Output driver static

CMOS MODE

Weak drive option not supported for

operating the CMOS drivers using a 1.8 V

supply

Maximum Output Frequency

3.3 V Supply

10 pF load

Strong Drive Strength Setting

250

MHz

Weak Drive Strength Setting

MHz

1.8 V Supply

150

MHz

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