Preliminary

PLL502-27

Low Phase Noise VCXO (24MHz to 50MHz)

47745 Fremont Blvd., Fremont, California 94538 TEL (510) 492-0990 FAX (510) 492-0991

Rev 2/25/03 Page 3

2. AC Electrical Specifications

PARAMETERS

SYMBOL

CONDITIONS

MIN.

TYP.

MAX.

UNITS

Input Crystal Frequency

12

25

MHz

0.8V ~ 2.0V with 10 pF load

1.15

Output Clock Rise/Fall Time

(Low Drive)

0.3V ~ 3.0V with 15 pF load

3.7

0.8V ~ 2.0V with 10 pF load

0.5

Output Clock Rise/Fall Time

(High Drive)

0.3V ~ 3.0V with 15 pF load

1.5

ns

Output Clock Duty Cycle

Measured @ 1.4V

45

50

55

%

Short Circuit Current

±50

mA

3. Voltage Control Crystal Oscillator

PARAMETERS

SYMBOL

CONDITIONS

MIN.

TYP.

MAX.

UNITS

VCXO Stabilization Time *

From power valid

10

ms

VCXO Tuning Range

500

ppm

CLK output pullability

0V

≤ VIN ≤ 3.3V

±250

ppm

VCXO Tuning Characteristic

165

ppm/V

Pull range linearity

10

%

VCON pin input impedance

2000

k

Ω

VCON modulation BW

0V

≤ VIN ≤ 3.3V, -3dB

25

kHz

Note:

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

4. Jitter and Phase Noise specification

PARAMETERS

CONDITIONS

MIN.

TYP.

MAX.

UNITS

RMS Period Jitter

(1 sigma – 1000 samples)

at 44MHz, with capacitive

decoupling between VDD

and GND.

10

ps

Phase Noise relative to carrier

44MHz @100Hz offset

-80

dBc/Hz

Phase Noise relative to carrier

44MHz @1kHz offset

-110

dBc/Hz

Phase Noise relative to carrier

44MHz @10kHz offset

-130

dBc/Hz

Phase Noise relative to carrier

44MHz @100kHz offset

-123

dBc/Hz

Phase Noise relative to carrier

44MHz @1MHz offset

-124

dBc/Hz