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LMX2346 Datasheet(PDF) 23 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) 23 Page - National Semiconductor (TI)

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2.0 Programming Description (Continued)
2.2.1 R_CTR[9:0]
Reference Divider (R COUNTER)
R[10:1]
The reference divider can be programmed to support divide ratios from 2 to 1023. Divide ratios of less than 2 are prohibited.
R_CNTR [9:0]
Reference Divider Ratio
9876543210
2
0000000010
3
0000000011
••••••••••
1,023
1111111111
2.2.2 CP_TRI
Charge Pump TRI-STATE
R[11]
The CP_TRI control bit allows the charge pump to be switched between a normal operating mode and a high impedance output
state. This happens asynchronously or immediately with the change in CP_TRI bit.
Control Bit
Register Location
Description
Function
01
CP_TRI
R[11]
Charge Pump
TRI-STATE
Charge Pump Operates
Normal
Charge Pump Output
in High Impedance
State
2.2.3 PD_POL
Phase Detector Polarity
R[12]
The PD_POL control bit is used to set the polarity of the phase detector based on the VCO tuning characteristic.
Control Bit
Register Location
Description
Function
01
PD_POL
R[12]
Phase Detector
Polarity
Negative VCO Tuning
Characteristic
Positive VCO Tuning
Characteristic
VCO Characteristics
20038409
2.2.4 LD_OUT[1:0]
LD Output Select
R[14:13]
The LD_Out control word is used to select which signal is routed the the LD pin.
LD_OUT[1:0]
LD Pin Output Mode
Output Circuit
Configuration
0
Digital Lock Detect
Push-Pull
1
Analog Lock Detect
Open-Drain
2
R divider output
Push-Pull
3
N divider output
Push-Pull
www.national.com
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