SM802128 查看數據表（PDF） - Micrel
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SM802128 Datasheet PDF : 12 Pages
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Micrel, Inc.
SM802128
AC Electrical Characteristics(4, 5)
VDD = VDDO1/2 = 3.3V ±5% or 2.5V ±5%
VDD = 3.3V ±5%, VDDO1/2 = 3.3V ±5% or 2.5V ±5%
TA = −40°C to +85°C. RL = 50Ω to VDDO − 2V
Symbol
FOUT1
FOUT2
FREF
TR/TF
ODC
TSKEW
TLOCK
Parameter
Output Frequency 1
Output Frequency 2
Reference Input Frequency
LVPECL Output Rise/Fall Time
Output Duty Cycle
Output-to-Output Skew
PLL Lock Time
Tjit(∅)
RMS Phase Jitter(7)
Spurious Noise Components
Condition
FSEL = 1
FSEL = 0
20% – 80%
Q1 – Q8 (6)
156.25MHz
Integration Range (1.875MHz – 20MHz)
Integration Range (12kHz – 20MHz)
312.5MHz
Integration Range (1.875MHz – 20MHz)
Integration Range (12kHz – 20MHz)
6.25MHz using 156.25MHz
12.5MHz using 312.5MHz
Min Typ
Max
156.25
312.5
25
80
175
350
48
50
52
45
20
110
250
110
250
-80
-85
Units
MHz
MHz
MHz
ps
%
ps
ms
fs
dBc
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. Defined as skew between outputs at the same supply voltage and with equal load conditions and same frequency; measured at the output
differential crossing points.
7. Measured using a 25MHz crystal as the input reference source. If using an external reference input, use a low phase noise source. With an
external reference, the phase noise will follow the input source phase noise up to about 1MHz offset frequency.
January 2012
6
hbwhelp@micrel.com or (408) 955-1690
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