Rainbow Electronics MAX3679A - Manual (Page 5)

MAX3679A
+3.3V, Low-Jitter Crystal to LVPECL
Clock Generator
_______________________________________________________________________________________ 5
NOISE SPUR AMPLITUDE
vs. NOISE FREQUENCY
MAX3679A toc07
NOISE FREQUENCY (kHz)
SPUR AMPLITUDE (dBc)
1000 100
-80
-70
-60
-50
-40
-30
-20
-10
0
-90
10 10,000
f
C
= 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 CC = +3.3V, T A = +25°C, crystal frequency = 25MHz.)
SUPPLY CURRENT
vs. TEMPERATURE
MAX3679A toc01
AMBIENT TEMPERATURE ( °C)
SUPPLY CURRENT (mA)
60 35 10 -15
25
50
75
100
125
150
175
200
225
250
0
-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 50 Ω 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)
10,000 1000 1 10 100
-150
-140
-130
-120
-110
-100
-90
-80
-160
0.1 100,000
PHASE NOISE AT 125MHz
CLOCK FREQUENCY
MAX3679A toc05
OFFSET FREQUENCY (kHz)
NOISE POWER DENSITY (dBc/Hz)
10,000 1000 1 10 100
-150
-140
-130
-120
-110
-100
-90
-80
-160
0.1 100,000