AD9546SLASHPCBZ datasheet(9/205 Pages) AD

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Data Sheet

AD9546

Rev. 0 | Page 9 of 205

SYSTEM CLOCK INPUTS, XOA AND XOB

Table 5.

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

SYSTEM CLOCK MULTIPLIER

Output Frequency Range

2250

2415

MHz

The frequency range of the internal voltage controlled

oscillator (VCO) places limits on the choice of the system

clock input frequency

Phase Frequency Detector (PFD) Rate

300

MHz

SYSTEM CLOCK INPUT DIRECT PATH

The direct path requires ac coupling to the XOA and XOB

pins (see Figure 31). Do not enable the frequency doubler

when using the direct path

Input Frequency Range

300

MHz

Degraded phase noise performance typically occurs for

frequencies below 50 MHz appearing at the input of the

phase frequency detector of the system clock PLL; for

optimal phase noise performance, the recommendation is

to use the quartz crystal resonator path (instead of the

direct path), a crystal resonator with a resonant frequency

≥50 MHz, the frequency doubler enabled, and the device

configured to use the system clock Compensation Method 3

(see the System Clock Compensation section)

Input Duty Cycle

Self Biased Common-Mode Voltage

0.75

Internally generated

Input Voltage

For dc-coupled, single-ended operation

High

0.9

Low

0.5

Differential Input Voltage Sensitivity

250

mV p-p

Minimum voltage swing required (as measured with a

differential probe) across the XOA/XOB pins to ensure

switching between logic states; the instantaneous voltage on

either pin must not exceed 1.2 V; accommodate the single-

ended input by ac grounding the complementary input;

800 mV p-p recommended for optimal jitter performance

Slew Rate for Sinusoidal Input

Functional

V/µs

Required to provide a locked and stable system clock

Operational

>31

V/µs

Required for <1 dBc phase noise degradation

System Clock Input Divider

(J Divider) Frequency

100

MHz

Input Resistance

kΩ

SYSTEM CLOCK INPUT QUARTZ

CRYSTAL RESONATOR PATH

The crystal resonator path includes an optional frequency

doubler

Resonator Frequency Range

MHz

Fundamental mode, AT cut crystal

Crystal Motional Resistance

100

Ω

For crystal resonant frequency > 52 MHz, the motional

resistance must not exceed 50 Ω and the crystal load

capacitance (CL) must not exceed 8 pF

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