SM802124 Datasheet, PDF (5/9 Pages) Micrel Semiconductor – ClockWorks™ DUAL 125MHz Ultra-Low Jitter, CMOS Frequency Synthesizer

Micrel, Inc.
SM802124
AC Electrical Characteristics^{(4, 5)}
V_DD = V_DDO = 3.3V±5% or 2.5V±5%
V_DD = 3.3V±5%, V_DDO = 2.5V±5%
T_A = 40°C to 85°C. R_L = 50Ω to V_DDO/2
Symbol
Parameter
F_OUT
Output Frequency
F_REF
T_R/T_F
ODC
Reference Input Frequency
LVCMOS Output Rise/Fall Time
Output Duty Cycle
T_LOCK
PLL Lock Time
20% – 80%
Condition
Min.
100
45
Typ.
125
15
300
50
Max.
500
55
20
Units
MHz
MHz
ps
%
ms
T_jit(∅)
RMS Phase Jitter⁽⁶⁾
Integration Range (1.875MHz – 20MHz)
85
fs
Integration Range (12kHz – 20MHz)
320
5MHz
-73
Spurious Noise Components
10MHz
20MHz
-82
dBc
-89
25MHz
-96
Notes:
1. Permanent device damage may occur if absolute maximum ratings are exceeded. This is a stress rating only and functional operation is not
implied at conditions other than those detailed in the operational sections of this data sheet. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability.
2. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings.
3. Package thermal resistance assumes exposed pad is soldered (or equivalent) to the devices most negative potential on the PCB.
4. The circuit is designed to meet the AC and DC specifications shown in the above table after thermal equilibrium has been established.
5. All phase-noise measurements were taken with an Agilent 5052B phase-noise system.
6. Ref_IN driven with a low-noise source ClockWorks SM802001 programmed for a 15MHz CMOS output. Phase noise will track the input phase noise
up to about 1MHz offset frequency.
September 2011
5
M9999-101311-B
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