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LMX2346 Datasheet(PDF) 24 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LMX2346
Description  PLLatinum™ Frequency Synthesizer for RF Personal Communications
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMX2346 Datasheet(HTML) 24 Page - National Semiconductor (TI)

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2.0 Programming Description (Continued)
2.2.5 R_OPT[2:0]
Reference Oscillator Optimization
R[17:15]
The R_OPT control words are used to optimize the performance of the reference buffer circuit for best Phase Noise and power
consumption performance based on the frequency of the reference source.
R_OPT[2:0]
Optimization Frequency
Range
0
5 MHz–50 MHz
7
50 MHz–104 MHz
1-6
Reserved — Do not use.
2.3 N REGISTER
The N register contains the PD (Power-Down), NA_CNTR, and NB_CNTR control words. The NA_CNTR, and NB_CNTR control
words are used to setup the programmable feedback divider. The PWR-DN control word is used to switch the device between the
normal operating mode and various power-down modes.
Register
Most Significant Bit
SHIFT REGISTER BIT LOCATION
Least Significant Bit
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Data Field
ADDR
N
NB_CNTR [9:0]
NA_CNTR [4:0]
PD [1:0]
0
2.3.1 PD[1:0]
Power-Down
N[2:1]
The PD control word is used to switch the device between the normal operating mode and various power-down modes.
PD [1:0]
Operating Mode
0
Normal Operation
1
Synchronous Power-down
2
Counter Reset
3
Asynchronous Power-down
2.3.2 NA_CNTR[4:0]
A Counter
N[7:3]
The NA_CNTR control word is used to program the A counter. The A counter is a 5-bit swallow counter used in the programmable
feedback divider. The A counter can be programmed to values ranging from 0 to 31. See Section 1.4 for details on how the value
of the A counter should be selected.
A Counter Value
NA_CNTR[4:0]
0
00000
1
00001
•••••
31
11111
2.3.3 NB_CNTR[9:0]
B Counter
N[17:8]
The NB_CNTR control word is used to program the B counter. The B counter is a 10-bit binary counter used in the programmable
feedback divider. The B counter can be programmed to values ranging from 3 to 1023. See Section 1.4 for details on how the
value of the B counter should be selected.
B Counter Value
NB_CNTR[9:0]
3
0000000011
4
0000000100
••••••••••
1023
1111111111
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