Electronic Components Datasheet Search

Delete All
ON OFF
 ALLDATASHEET.COM Part #DescriptionMarking X

## LMX2306 Datasheet(PDF) 16 Page - National Semiconductor (TI)

 [Old version datasheet] Texas Instruments acquired National semiconductor.
 Part # LMX2306 Description PLLatinum??Low Power Frequency Synthesizer for RF Personal Communications Download 19 Pages Scroll/Zoom 100% Manufacturer NSC [National Semiconductor (TI)] Direct Link http://www.national.com Logo

## LMX2306 Datasheet(HTML) 16 Page - National Semiconductor (TI)

 16 / 19 page1.7 Application Information (Continued)1.7.6 N COUNTERThe calculated value of N, and the value of P are now used to determine the values of A and B where A and B are both integervalues:N=P * B+ Awhere B is the divisor and A is the remainder. Therefore:B = div (N/P)andA = N−(B * P)For this example, B and A are calculated as follows:B = div (4750/32) = 148 = 0000010010100andA = 4750 − (148 * 32)=14=01110To load the N counter with these values, the programming bit stream would be as follows. The first bit, the GO bit, (MSB) N[19]is used for FastLock operation and will be discussed in the F Latch section. The next 13 bits, (N[18]–N[6]) shifted in, are the Bcounter value, 0000010010100b *. Bits N[5]–N[1] are the A counter and are 01110b in this example. The final two bits (the controlbits) are 1,0 identifying the N counter. In programming the N counter, the value of B must be greater than or equal to A, and thevalue of B must be greater than or equal to 3.Note: *In programming the counter, data is shifted in MSB first.1.7.7 R COUNTERProgramming the R counter is done by shifting in the binary value of R calculated previously (50d = 110010b). The first bit shiftedin is R[19] the LD precision bit. The next 4 bits (R[18]–R[15]) shifted in, are used for testing and should always be loaded withzeros. The R[14]–R[1] bits are used to program the reference divider ratio and should be 00000000110010b for this example. Thefinal two bits, C[1] and C[2] denote the R counter and should be 0, 0. The resulting bit stream looks as follows:1.7.8 F LATCHTo program the device for any of the FastLock modes, C[1] = 0 and C[2] = 1 which direct data to the F latch. The Section 1.3FUNCTION AND INITIALIZATION LATCH section discusses the 4 modes of FastLock operation. The user must first determinewhich FastLock mode will be used. When using any of the FastLock modes, the programmer needs to experimentally determinethe length of time to stay in high gain mode. This is done by looking at the transient response and determining the time at whichthe device has settled to within the appropriate frequency tolerance. FastLock mode should be terminated just prior to “lock” toplace the switching phase glitch within the transient settling time. The counter reset mode (F[1] bit) holds both the N and Rcounters at load point when F[1] = HIGH. Upon setting F[1] = LOW, the N and R counters will resume counting in close phasealignment. Other functions of the F latch such as FoLD output control, Phase detector polarity, and charge pump TRI-STATE aredefined in the 1.3 FUNCTION AND INITIALIZATION LATCH section also.DS100127-14DS100127-16www.national.com16

## Similar Part No. - LMX2306

 Manufacturer Part # Datasheet Description National Semiconductor ... LMX2306 338Kb / 19P PLLatinum??Low Power Frequency Synthesizer for RF Personal Communications Texas Instruments LMX2306 548Kb / 19P [Old version datasheet]   PLLatinum??Low Power Frequency Synthesizer for RF Personal Communications LMX2306 550 MHz, LMX2316 1.2 GHz, LMX2326 2.8 GHz National Semiconductor ... LMX2306 338Kb / 19P PLLatinum??Low Power Frequency Synthesizer for RF Personal Communications
More results

## Similar Description - LMX2306

 Manufacturer Part # Datasheet Description Texas Instruments LMX2326TM 548Kb / 19P [Old version datasheet]   PLLatinum Low Power Frequency Synthesizer for RF Personal Communications National Semiconductor ... LMX2306 338Kb / 19P PLLatinum??Low Power Frequency Synthesizer for RF Personal Communications LMX2346 606Kb / 27P PLLatinum??Frequency Synthesizer for RF Personal Communications Texas Instruments LMX2335 437Kb / 19P [Old version datasheet]   PLLatinum Dual Frequency Synthesizer for RF Personal Communications National Semiconductor ... LMX2335L 542Kb / 22P PLLatinum??Low Power Dual Frequency Synthesizer for RF Personal Communications LMX2330L 496Kb / 21P PLLatinum??Low Power Dual Frequency Synthesizer for RF Personal Communications LMX2323 185Kb / 12P PLLatinum 2.0 GHz Frequency Synthesizer for RF Personal Communications LMX2330A 392Kb / 17P PLLatinum??Dual Frequency Synthesizer for RF Personal Communications LMX2332U 3Mb / 42P PLLatinum Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications LMX2335U 3Mb / 48P PLLatinum Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications
More results