PLL502-02

Low Phase Noise VCXO (24MHz to 50MHz)

47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991 www.phaselink.com Rev 12/14/05 Page 3

3. AC Electrical Specifications

PARAMETERS

SYMBOL

CONDITIONS

MIN.

TYP.

MAX.

UNITS

Input Crystal Frequency

12

25

MHz

Output Clock Rise/Fall Time

(Standard Drive)

0.3V ~ 3.0V with 15 pF load

2.4

Output Clock Rise/Fall Time

(High Drive)

0.3V ~ 3.0V with 15 pF load

1.2

ns

Output Clock Duty Cycle

45

50

55

%

4. Voltage Control Crystal Oscillator

PARAMETERS

SYMBOL

CONDITIONS

MIN.

TYP.

MAX.

UNITS

VCXO Stabilization Time *

From power valid

10

ms

VCXO Tuning Range

0V

≤ VCON ≤ 3.3V

500

ppm

CLK output pullability

VCON=1.65V,

±1.65V

±200

ppm

VCXO Tuning Characteristic

165

ppm/V

Pull range linearity

10

%

VCON pin input impedance

2000

k

Ω

VCON modulation BW

0V

≤ VCON ≤ 3.3V, -3dB

25

kHz

Note: Parameters denoted with an asterisk (*) represent nominal characterization data and are not production tested to any specific limits.

5. Jitter and Phase Noise Specification

PARAMETERS

CONDITIONS

MIN.

TYP.

MAX.

UNITS

RMS Period Jitter

(1 sigma – 1000 samples)

at 44MHz, with capacitive decoup-

ling between VDD and GND.

3

ps

Phase Noise relative to carrier

44MHz @100Hz offset

-100

dBc/Hz

Phase Noise relative to carrier

44MHz @1kHz offset

-123

dBc/Hz

Phase Noise relative to carrier

44MHz @10kHz offset

-130

dBc/Hz

Phase Noise relative to carrier

44MHz @100kHz offset

-125

dBc/Hz

Phase Noise relative to carrier

44MHz @1MHz offset

-125

dBc/Hz

6. Crystal Specifications

PARAMETERS

SYMBOL

MIN.

TYP.

MAX.

UNITS

Crystal Resonator Frequency

12

25

MHz

Crystal Loading Capacitance Rating

9.5

pF

C0/C1

250

-

ESR

30

Ω

Note: Crystal Loading rating: 9.5pF is the loading the crystal sees from the VCXO chip at VCON = 1.65V. It is assumed that the crystal will be at

nominal frequency at this load. If the crystal requires more load to be at nominal frequency, the additional load must be added externally.

This however may reduce the pull range.