LMX1501 datasheet(18/22 Pages) NSC

Il numero della parte	LMX1501

Spiegazioni elettronici	PLLatinumTM 1.1 GHz Frequency Synthesizer for RF Personal Communications

PDF	22 Pages

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Produttore elettronici	NSC [National Semiconductor (TI)]

Homepage	http://www.national.com

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18 / 22 page

Application Information (Continued)

TLW12340 – 43

FIGURE 5 PLL Reference Spurs

The reference spurious level is k b66 dBc due to the loop

filter attenuation and the low spurious noise level of the

LMX1511

TLW12340 – 45

FIGURE 6 PLL Phase Noise 35 kHz Offset

The phase noise level at 3 kHz offset is b65 dBcHz

TLW12340 – 44

FIGURE 7 PLL Phase Noise

150 Hz Offset

The phase noise level at 150 Hz offset is b755 dBcHz

TLW12340 – 42

FIGURE 8 Frequency Jump Lock Time

Of concern in any PLL loop filter design is the time it takes

to lock in to a new frequency when switching channels

Fig-

ure 8 shows the switching waveforms for a frequency jump

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 g1 kHz The lock

time is seen to be k 16 ms for a frequency jump of 58 MHz

LMX1501 Scheda tecnica(PDF) 18 Page - National Semiconductor (TI)