LMX1511TMX National Semiconductor, LMX1511TMX Datasheet - Page 18

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LMX1511TMX

Manufacturer Part Number
LMX1511TMX
Description
IC FREQ SYNTHESZR 1.1GHZ 20TSSOP
Manufacturer
National Semiconductor
Series
PLLatinum™r
Type
PLL Frequency Synthesizerr
Datasheet

Specifications of LMX1511TMX

Pll
Yes
Input
CMOS, TTL
Output
Clock
Number Of Circuits
1
Ratio - Input:output
2:1
Differential - Input:output
Yes/No
Frequency - Max
1.1GHz
Divider/multiplier
Yes/No
Voltage - Supply
2.7 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
20-TSSOP
Frequency-max
1.1GHz
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
*LMX1511TMX

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Application Information
The reference spurious level is
filter attenuation and the low spurious noise level of the
LMX1511
The phase noise level at 150 Hz offset is
FIGURE 7 PLL Phase Noise
FIGURE 5 PLL Reference Spurs
k
b
66 dBc due to the loop
150 Hz Offset
(Continued)
b
75 5 dBc Hz
TL W 12340– 43
TL W 12340– 44
18
ure 8 shows the switching waveforms for a frequency jump
The phase noise level at 3 kHz offset is
Of concern in any PLL loop filter design is the time it takes
to lock in to a new frequency when switching channels Fig-
of 857 MHz– 915 MHz By narrowing the frequency span of
the HP53310A Modulation Domain Analyzer enables evalu-
ation of the frequency lock time to within
time is seen to be
FIGURE 6 PLL Phase Noise 3 5 kHz Offset
FIGURE 8 Frequency Jump Lock Time
k
1 6 ms for a frequency jump of 58 MHz
b
g
65 dBc Hz
1 kHz The lock
TL W 12340 – 45
TL W 12340 – 42

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