Electrical characteristics (continued) – Rainbow Electronics MAX3625В User Manual
Page 3
MAX3625B
Low-Jitter, Precision Clock
Generator with Three Outputs
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +3.6V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
CC
= +3.3V, T
A
= +25°C, unless other-
wise noted.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
REF_IN SPECIFICATIONS (Input DC- or AC-Coupled)
PLL enabled
24.8
27.0
Reference Clock Frequency
PLL bypassed
320
MHz
Input-Voltage High
V
IH
2.0
V
Input-Voltage Low
V
IL
0.8
V
Input High Current
I
IH
V
IN
= V
CC
240
μA
Input Low Current
I
IL
V
IN
= 0V
-240
μA
Reference Clock Duty Cycle
PLL enabled
30
70
%
Input Capacitance
2.5
pF
CLOCK OUTPUT AC SPECIFICATIONS
VCO Frequency Range
620
648
MHz
12kHz to 20MHz
0.36
1.0
Random Jitter (Note 5)
RJ
RMS
1.875MHz to 20MHz
0.14
ps
RMS
Spurs Induced by Power-Supply
Noise
(Notes 6, 7, 8)
-60
dBc
Deterministic Jitter Induced by
Power-Supply Noise
(Note 9)
5.6
ps
P-P
Nonharmonic and Subharmonic
Spurs
-70 dBc
Output Skew
Between any output pair
5
ps
f = 1kHz
-124
f = 10kHz
-127
f = 100kHz
-131
f = 1MHz
-145
Clock Output SSB Phase Noise
at 125MHz (Note 10)
f > 10MHz
-153
dBc/Hz
Note 1:
A series resistor of up to 10.5
Ω is allowed between V
CC
and V
CCA
for filtering supply noise when system power-supply
tolerance is V
CC
= 3.3V ±5%. See Figure 1.
Note 2:
LVPECL outputs guaranteed up to 320MHz.
Note 3:
All outputs enabled and unloaded.
Note 4:
Measured with a crystal (see Table 4) or an AC-coupled, 50% duty-cycle signal on REF_IN.
Note 5:
Measured with crystal source, see Table 4.
Note 6:
Measured using setup shown in Figure 1.
Note 7:
Measured with 40mV
P-P
, 100kHz sinusoidal signal on the supply.
Note 8:
Measured at 156.25MHz output.
Note 9:
Calculated based on measured spurs induced by power-supply noise (refer to Application Note 4461:
HFAN-04.5.5:
Characterizing Power-Supply Noise Rejection in PLL Clock Synthesizers).
Note 10: Measured with 25MHz crystal or 25MHz reference clock at REF_IN with a slew rate of 0.5V/ns or greater.