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LMX2430 Datasheet(PDF) 45 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
No. de pieza LMX2430
Descripción Electrónicos  PLLatinum Dual High Frequency Synthesizer for RF Personal Communications
PDF  49 Pages
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMX2430 Datasheet(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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