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LMX2377UTM Datasheet(PDF) 39 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LMX2377UTM
Description  PLLatinum??Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications
PDF  44 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMX2377UTM Datasheet(HTML) 39 Page - National Semiconductor (TI)

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2.0 Programming Description (Continued)
2.6.2 PD_POL Main
MAIN SYNTHESIZER PHASE DETECTOR POLARITY
Main R[17]
The PD_POL Main bit is used to control the Main synthesizer’s phase detector polarity based on the VCO tuning characteristics.
Control Bit
Register Location
Description
Function
01
PD_POL Main
Main R[17]
Main Phase Detector
Polarity
Main VCO Negative
Tuning
Characteristics
Main VCO Positive
Tuning
Characteristics
Main VCO Characteristics
20022682
2.6.3 ID
o Main
MAIN SYNTHESIZER CHARGE PUMP CURRENT GAIN
Main R[18]
The ID
o Main bit controls the Main synthesizer’s charge pump gain. Two current levels are available.
Control Bit
Register Location
Description
Function
01
ID
o Main
Main R[18]
Main Charge Pump
Current Gain
LOW
0.95 mA
HIGH
3.80 mA
2.6.4 TRI-STATE ID
o Main
MAIN SYNTHESIZER CHARGE PUMP TRI-STATE CURRENT
Main R[19]
The TRI-STATE ID
o Main bit allows the charge pump to be switched between a normal operating mode and a high impedance
output state. This happens asynchronously with the change in the TRI-STATE ID
o Main bit.
Furthermore, the TRI-STATE ID
o Main bit operates in conjuction with the PWDN Main bit to set a synchronous or an
asynchronous powerdown mode.
Control Bit
Register Location
Description
Function
01
TRI-STATE ID
o Main
Main R[19]
Main Charge Pump
TRI-STATE Current
Main Charge Pump
Normal Operation
Main Charge Pump
Output in High
Impedance State
www.national.com
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