Rainbow-electronics MAX3679A Bedienungsanleitung PDF herunterladen (Seite 5)

MAX3679A

+3.3V, Low-Jitter Crystal to LVPECL

Clock Generator

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NOISE SPUR AMPLITUDE

vs. NOISE FREQUENCY

MAX3679A toc07

NOISE FREQUENCY (kHz)

SPUR AMPLITUDE (dBc)

1000100

-80

-70

-60

-50

-40

-30

-20

-10

-90

10 10,000

= 156.25MHz

NOISE AMPLITUDE = 40mV

P-P

JITTER HISTOGRAM (312.5MHz OUTPUT,

40mV

P-P

SUPPLY NOISE AT 100kHz)

MAX3679A toc06

5ps/div

DJ = 5.0ps

P-P

Typical Operating Characteristics

(Typical values are at V

= +3.3V, T

= +25°C, crystal frequency = 25MHz.)

SUPPLY CURRENT

vs. TEMPERATURE

MAX3679A toc01

AMBIENT TEMPERATURE (°C)

SUPPLY CURRENT (mA)

603510-15

100

125

150

175

200

225

250

-40 85

ALL OUTPUTS ACTIVE AND TERMINATED

ALL OUTPUTS ACTIVE AND UNTERMINATED

DIFFERENTIAL OUTPUT WAVEFORM

AT 156.25MHz (LVPECL OUTPUT)

MAX3679A toc02

1ns/div

AMPLITUDE (200mV/div)

OUTPUT WAVEFORM AT 125MHz

(LVCMOS OUTPUT)

MAX3679A toc03

1ns/div

AMPLITUDE (50mV/div)

MEASURED USING 50Ω OSCILLOSCOPE INPUT

THROUGH NETWORK SHOWN IN FIGURE 1

PHASE NOISE AT 312.5MHz

CLOCK FREQUENCY

MAX3679A toc04

OFFSET FREQUENCY (kHz)

NOISE POWER DENSITY (dBc/Hz)

10,00010001 10 100

-150

-140

-130

-120

-110

-100

-90

-80

-160

0.1 100,000

PHASE NOISE AT 125MHz

CLOCK FREQUENCY

MAX3679A toc05