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LMX2430 bảng dữ liệu(PDF) 45 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
tên linh kiện LMX2430
Giải thích chi tiết về linh kiện  PLLatinum Dual High Frequency Synthesizer for RF Personal Communications
PDF  49 Pages
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
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LMX2430 bảng dữ liệu(HTML) 45 Page - National Semiconductor (TI)

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2.0 Programming Description (Continued)
2.8.2 IF_B[13:0] - IF Synthesizer Programmable Binary Counter (B Counter) (R4[20:7])
The IF_B control word is used to setup the IF synthesizer’s B counter. The B counter is a 14-bit programmable binary counter
used in the programmable feedback divider. The IF_B control word can be programmed to values ranging from 3 to 16383. Divide
ratios less than 3 are prohibited.
Divide
Ratio
IF_B[13:0]
13
12
11
10
987654321
0
3
0000000000001
1
4
0000000000010
0
•
•••••••••••••
•
16383
1111111111111
1
2.8.3 IF_P - IF Synthesizer Prescaler Select (R4[22])
The LMX243x IF synthesizer utilizes a selectable dual modulus prescaler. An 8/9 or a 16/17 prescale ratio can be selected.
Control Bit
Register Location
Description
Function
01
IF_P
R4[22]
IF Prescaler Select
8/9 Prescaler
Selected
16/17 Prescaler
Selected
2.8.4 IF_PD - IF Synthesizer Powerdown (R4[23])
The IF_PD bit is used to switch the IF PLL between a powered up and powered down mode.
Furthermore, the IF_PD bit operates in conjuction with the IF_CPT bit to set a synchronous or an asynchronous powerdown
mode. Refer to Section 2.7.4 for more details on how to program the IF_CPT bit.
Control Bit
Register Location
Description
Function
01
IF_PD
R4[23]
IF Powerdown
IF PLL Active
IF PLL Powerdown
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