參數(shù)資料
型號: LMX2542LQX2121
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: XO, clock
英文描述: PLLatinum Cellular and GPS Frequency Synthesizer System with Integrated VCO
中文描述: PLL FREQUENCY SYNTHESIZER, QCC28
封裝: 5 X 5 MM, 0.75 MM HEIGHT, LLP-28
文件頁數(shù): 17/22頁
文件大?。?/td> 253K
代理商: LMX2542LQX2121
2.0 Programming Description
(Continued)
2.2.3 RF_B[3:0] - RF Synthesizer Programmable Binary Counter (B Counter) (R0[16:19])
The RF_B control word is used to setup the RF synthesizer’s B counter. The B counter is a 4-bit programmable binary counter
used in the programmable feedback divider. The RF_B control word can be programmed to values ranging from 2 to 15. Divide
ratios less than 2 are prohibited.
Divide Ratio
RF_B[3:0]
3
0
0
1
2
0
0
1
1
1
1
1
0
0
1
1
2
3
15
2.2.4 RF_LD - RF Synthesizer System Lock Detect (R0[21])
The RF_LD bit is used to indicate the lock status of the RF synthesizer system.
Control Bit
Register Location
Description
Function
0
1
RF_LD
R0[21]
RF Synthesizer
System Lock Detect
Hard Zero
(GND)
Lock Detect
2.2.5 SPI_DEF - Serial Port Interface Default Register Selection (R0[23])
The SPI_DEF bit selects between using the default IF counter values and user programmable values.
Control Bit
Register Location
Description
Function
0
1
SPI_DEF
R0[23]
Serial Port Interface
Default Register
Selection
Default Counter
Values OFF.
Program Registers
R0 through R6
Default Counter
Values ON.
Program Registers
R0 through R2
L
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