SM802123 Datasheet, PDF (5/12 Pages) Micrel Semiconductor – ClockWorks™ 125MHz/25MHz Ultra-Low Jitter, LVCMOS Frequency Synthesizer

Micrel, Inc.
SM802123
REF_IN DC Electrical Characteristics⁽⁴⁾
V_DD = 3.3V ±5%, or 2.5V ±5%, T_A = −40°C to +85°C
Symbol Parameter
Condition
V_IH
Input High Voltage
V_IL
Input Low Voltage
I_IN
Input Current
V_IN = 0V to V_DD
Min.
1.1
−0.3
−5
Typ.
Max.
V_DD + 0.3
0.6
5
Units
V
V
μA
AC Electrical Characteristics^{(4, 5)}
V_DD = V_DDO1/2 = 3.3V ±5% or 2.5V ±5%
V_DD = 3.3V ±5%, V_DDO1/2 = 3.3V ±5% or 2.5V ±5%
T_A = −40°C to +85°C. R_L = 50Ω to V_DDO/2
Symbol Parameter
Condition
F_OUT
Output Frequency
Q1 – /Q8
Q9 – Q16
T_R/T_F
LVCMOS Output Rise/Fall
Time
20% – 80%, Fig. 2
ODC
Output Duty Cycle
T_LOCK
T_jit(∅)
PLL Lock Time
RMS Phase Jitter ⁽⁶⁾
(Output = 25MHz)
RMS Phase Jitter ⁽⁶⁾
(Output = 125MHz)
Integration Range:(12kHz – 5MHz)
5MHz limited by phase-noise system.
Integration Range:(12kHz – 20MHz)
Integration Range:(1.875MHz – 20MHz)
Spurious Noise Components 25MHz
Min
Typ
Max Units
25
MHz
125
100
200
500
ps
45
50
55
%
20
ms
315
fs
340
fs
115
fs
−64
dBc
Notes:
1. All phase-noise measurements were taken with an Agilent 5052B phase-noise system.
2. REF_IN driven with a low-noise source ClockWorks^TM SM802001 programmed for a 25MHz CMOS output. Phase noise will track the input phase
noise up to about 1MHz offset frequency.
January 2012
5
M9999-012312-A
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