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LMX2531LQ1312E

Evaluation Board Operating Instructions

National Semiconductor Corporation

Timing Devices Business Group

10333 North Meridian

Suite 400

Indianapolis, IN 46290

LMX2531LQ1312EFPEB Rev 4.02.2008

Содержание LMX2531LQ1312E

Страница 1: ...2531LQ1312E Evaluation Board Operating Instructions National Semiconductor Corporation Timing Devices Business Group 10333 North Meridian Suite 400 Indianapolis IN 46290 LMX2531LQ1312EFPEB Rev 4 02 20...

Страница 2: ...DIVIDE BY 2 DISABLED 6 FREE RUNNING VCO NOISE INTERNAL DIVIDE BY 2 ENABLED 7 FRACTIONAL SPURS INTERNAL DIVIDE BY 2 DISABLED 8 FRACTIONAL SPURS INTERNAL DIVIDE BY 2 ENABLED 9 INTEGER SPURS INTERNAL DIV...

Страница 3: ...s tend to be very noisy and should be used with caution If a signal generator is used the signal generator phase noise contribution can be reduced by setting the signal to 80 MHz and dividing this dow...

Страница 4: ...or If a signal generator is used the RF should be set to ON If using the lower frequency band DIV2 1 understand that the VCO frequency in CodeLoader should be twice the frequency at the Fout pin Ensur...

Страница 5: ...3 1 2 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 1314 MHz Internal Divide by 2 Disabled DIV2 0 Output Frequency 657 MHz Internal Divide by...

Страница 6: ...e EN_PLL EN_PLLLDO1 and EN_PLLLDO2 bits The equipment needs to be able to track the VCO phase noise to measure in this way and one can not let the VCO drift too far off in frequency If this kind of eq...

Страница 7: ...o lock the PLL to the proper frequency then disable the EN_PLL EN_PLLLDO1 and EN_PLLLDO2 bits The equipment needs to be able to track the VCO phase noise to measure in this way and one can not let the...

Страница 8: ...pur at 250 kHz offset at a worst case frequency of 1270 25 MHz is 74 4 dBc Worst case channels occur at exactly one channel spacing above or below a multiple of the crystal frequency Fractional Spur a...

Страница 9: ...c Since this mode uses the divide by 2 mode the channel spacing here is actually 125 kHz If there was a fractional spur at 125 kHz it could be eliminated by doubling the channel spacing before the div...

Страница 10: ...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 1268 MHz is 92 8 dBc Spur at 10 MHz offset for a frequency of 1314 MHz is below the spectrum anal...

Страница 11: ...rs Internal Divide by 2 Enabled Spur at 10 MHz offset for a frequency of 634 MHz is below the spectrum analyzer noise floor Spur at 10 MHz offset for a frequency of 657 MHz is below the spectrum analy...

Страница 12: ...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 The CodeLoader program is designed to work with many devices When CodeLoader is first started it is necessary t...

Страница 13: ...enu This restores bit settings and frequencies but not the Port Setup information The default reference oscillator used for these instructions was 10 MHz but there is an alternate mode for a 61 44 MHz...

Страница 14: ...bit to view more information about what this does When the DIV2 bit is enabled the frequency from the part will be half of that shown on the PLL VCO tab The frequency on the PLL VCO tab does not refl...

Страница 15: ...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 trl L R5 INIT1 and R5 INIT 2 are just the...

Страница 16: ...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...

Страница 17: ...10 uWIRE R10 C6 R2pLF C16 FRAME Fout Vcc R21 R19 R20 C1 R2 C12 C2 VccVCO VccDIG VccPLL VccBUF R3 C3 C17 R4 C9 C4 R5 C5 OSCin VccVCO VccPLL VccBUF C13 C18 C20 R7 R23 R22 Ftest LD C15 C22 R1 R9 TRIGGE...

Страница 18: ...9 2 Panasonic P 22AHCT ND 603 10 0 1W Thick Film 0 22 R22 R23 10 2 Vishay CRCW06033R3JRT1 603 0 1W Thick Film 3 3 R1 R18 5 11 4 Vishay CRCW0603100JRT1 603 5 0 1W Thick Film 10 R2 R3 R4 R5 12 1 Vishay...

Страница 19: ...L M X 2 5 3 1 L Q 1 3 1 2 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...

Страница 20: ...L M X 2 5 3 1 L Q 1 3 1 2 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 Groun 5 Mils Down FR4 d Plane 1 20...

Страница 21: ...L M X 2 5 3 1 L Q 1 3 1 2 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...

Страница 22: ...L M X 2 5 3 1 L Q 1 3 1 2 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...

Страница 23: ...L M X 2 5 3 1 L Q 1 3 1 2 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...

Страница 24: ...or use in safety critical applications such as life support where a failure of the TI product would reasonably be expected to cause severe personal injury or death unless officers of the parties have...