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National Semiconductor LMX2531LQ1226E Operating Instructions Manual

Summary of LMX2531LQ1226E

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    Lmx2531lq1226e evaluation board operating instructions national semiconductor corporation timing devices business group 10333 north meridian suite 400 indianapolis, in 46290 lmx2531lq1226efpeb rev 3.31.2008.

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    L m x 2 5 3 1 l q 1 2 2 6 e e v a l u a t i o n b o a r d o p e r a t i n g i n s t r u c t i o n s table of contents t able of c ontents ...................................................................................................................... 2 l oop f ilter ..............................

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    L m x 2 5 3 1 l q 1 2 2 6 e e v a l u a t i o n b o a r d o p e r a t i n g i n s t r u c t i o n s loop filter loop bandwidth 8.0 khz k φ 1440 ua (16x) phase margin 61.3 deg fcomp 10 mhz crystal frequency 10 mhz output frequency 1184 – 1268 mhz (div2=0) 592 - 634 mhz (div2=1) supply voltage 3.0 vol...

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    L m x 2 5 3 1 l q 1 2 2 6 e e v a l u a t i o n b o a r d o p e r a t i n g i n s t r u c t i o n s troubleshooting problem corrective actions softw ar e do es no t co mmu nica te with th e ev alua tio n boa rds all modes • ensure a valid signal is presented to the oscin connector. If a signal gener...

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    L m x 2 5 3 1 l q 1 2 2 6 e e v a l u a t i o n b o a r d o p e r a t i n g i n s t r u c t i o n s phase noise output frequency = 1226 m h z internal di vide by 2 disabled (div2=0) output frequency = 613 mhz internal di vide by 2 enabled (div2=1) 5.

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    L m x 2 5 3 1 l q 1 2 2 6 e e v a l u a t i o n b o a r d o p e r a t i n g i n s t r u c t i o n s free-running vco phase noise (internal divide by 2 disabled) fout = 118 4 mhz fout = 122 6 mhz fout = 126 8 mhz the plots to the left show the true phase noise capability of the vco. In order to take ...

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    L m x 2 5 3 1 l q 1 2 2 6 e e v a l u a t i o n b o a r d o p e r a t i n g i n s t r u c t i o n s free-running vco phase noise (internal divide by 2 enabled) fout = 592 mhz (1184 mhz/2 ) fout = 613 mhz (1226 mhz/2 ) fout = 634 mhz (1268 mhz/2 ) the plots to the left show the true phase noise capab...

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    L m x 2 5 3 1 l q 1 2 2 6 e e v a l u a t i o n b o a r d o p e r a t i n g i n s t r u c t i o n s fractional spurs (internal divide by 2 disabled) fractional spur at 250 khz offset at a worst case frequency of 1190.25 mhz is –75.7 dbc. Worst case channels occur at exactly one channel spacing above...

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    L m x 2 5 3 1 l q 1 2 2 6 e e v a l u a t i o n b o a r d o p e r a t i n g i n s t r u c t i o n s fractional spurs (internal divide by 2 enabled) spur at 250 khz offset at a frequency of 595.125 mhz is –80.4 dbc. Since this mode uses the divide by 2 mode, the channel spacing here is actually 125 k...

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    L m x 2 5 3 1 l q 1 2 2 6 e e v a l u a t i o n b o a r d o p e r a t i n g i n s t r u c t i o n s integer spurs (internal divide by 2 disabled) spur at 10 mhz offset for a frequency of 1184 mhz is below the spectrum analyzer noise floor. Spur at 10 mhz offset for a frequency of 1226 mhz is -89.7 d...

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    L m x 2 5 3 1 l q 1 2 2 6 e e v a l u a t i o n b o a r d o p e r a t i n g i n s t r u c t i o n s integer spurs (internal divide by 2 enabled) spur at 10 mhz offset for a frequency of 592 mhz is below the spectrum analyzer noise floor. Spur at 10 mhz offset for a frequency of 613 mhz is better tha...

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    L m x 2 5 3 1 l q 1 2 2 6 e e v a l u a t i o n b o a r d o p e r a t i n g i n s t r u c t i o n s codeloader settings codeloader runs many devices. When codeloader is first started, it is necessary to select the correct device. 12.

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    L m x 2 5 3 1 l q 1 2 2 6 e e v a l u a t i o n b o a r d o p e r a t i n g i n s t r u c t i o n s there can be different modes defined for a particular part. A mode can be recalled easily from the menu. This restores bit settings and frequencies, but not the port setup information. For the codeloa...

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    L m x 2 5 3 1 l q 1 2 2 6 e e v a l u a t i o n b o a r d o p e r a t i n g i n s t r u c t i o n s the bits/pins tab displays many of the bits used to program the part. Right mouse click any bit to view more information about what this does. When the div2 bit is enabled, the frequency from the part...

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    L m x 2 5 3 1 l q 1 2 2 6 e e v a l u a t i o n b o a r d o p e r a t i n g i n s t r u c t i o n s the registers tab shows the literal bits that are being sent to the part. These are the registers every time the pll is loaded by using the menu command or ctrl+l. R5 (init1) and r5 (init 2) are just ...

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    L m x 2 5 3 1 l q 1 2 2 6 e e v a l u a t i o n b o a r d o p e r a t i n g i n s t r u c t i o n s the port setup tells codeloader what information goes where. If this is wrong, the part will not program. Although lpt1 is usually correct, codeloader does not automatically detect the correct port. O...

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    L m x 2 5 3 1 l q 1 2 2 6 e e v a l u a t i o n b o a r d o p e r a t i n g i n s t r u c t i o n s schematic 1 2 3 4 5 6 a b c d 6 5 4 3 2 1 d c b a title number revision size b date: 6-jan-2006 sheet of file: c:\documentum\checkout\lmx2531lqebpcb.Ddb.Ddb drawn by: r6 r16 r15 r13 r12 r11 r 2_l f r8...

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    L m x 2 5 3 1 l q 1 2 2 6 e e v a l u a t i o n b o a r d o p e r a t i n g i n s t r u c t i o n s bill of materials bill of materials lmx2531_lf revision 3.28.2008 item qty manufacturer part # size tol voltage material value designators c1_lf, c2plf, c2, c3, c4, c5, c9, c11, c14, c17, c18, c19, c2...

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    L m x 2 5 3 1 l q 1 2 2 6 e e v a l u a t i o n b o a r d o p e r a t i n g i n s t r u c t i o n s top layer 19.

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    L m x 2 5 3 1 l q 1 2 2 6 e e v a l u a t i o n b o a r d o p e r a t i n g i n s t r u c t i o n s mid layer 1 "ground plane" (15 mils down fr4) 20

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    L m x 2 5 3 1 l q 1 2 2 6 e e v a l u a t i o n b o a r d o p e r a t i n g i n s t r u c t i o n s mid layer 2 "power" 21.

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    L m x 2 5 3 1 l q 1 2 2 6 e e v a l u a t i o n b o a r d o p e r a t i n g i n s t r u c t i o n s bottom layer "signal" note: total board thickness = 61 mils 22.

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    L m x 2 5 3 1 l q 1 2 2 6 e e v a l u a t i o n b o a r d o p e r a t i n g i n s t r u c t i o n s top build diagram 23.

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    Important notice texas instruments incorporated and its subsidiaries (ti) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the...