lmx2377u National Semiconductor Corporation, lmx2377u Datasheet - Page 39

• Manufacturer Part Number: lmx2377u
• Description: Lmx2377u Pllatinum? Ultra Low Power Dual Frequency Synthesizer For Rf Personal Communications 2.5 Ghz/1.2 Ghz
• Manufacturer: National Semiconductor Corporation

2.0 Programming Description
2.6.2 PD_POL Main
The PD_POL Main bit is used to control the Main synthesizer’s phase detector polarity based on the VCO tuning characteristics.
2.6.3 ID
The ID
2.6.4 TRI-STATE ID
The TRI-STATE ID
output state. This happens asynchronously with the change in the TRI-STATE ID
Furthermore, the TRI-STATE ID
asynchronous powerdown mode.
TRI-STATE ID
PD_POL Main
Control Bit
Control Bit
Control Bit
ID
o
o
o
Main bit controls the Main synthesizer’s charge pump gain. Two current levels are available.
Main
Main
o
Main
o
o
Main bit allows the charge pump to be switched between a normal operating mode and a high impedance
Main
Register Location
Register Location
Register Location
MAIN SYNTHESIZER CHARGE PUMP CURRENT GAIN
Main R[17]
Main R[18]
Main R[19]
MAIN SYNTHESIZER CHARGE PUMP TRI-STATE CURRENT
MAIN SYNTHESIZER PHASE DETECTOR POLARITY
o
Main bit operates in conjuction with the PWDN Main bit to set a synchronous or an
Main VCO Characteristics
(Continued)
Main Phase Detector
Polarity
Main Charge Pump
Current Gain
Main Charge Pump
TRI-STATE Current
Description
Description
Description
39
Main VCO Negative
Tuning
Characteristics
Main Charge Pump
Normal Operation
o
20022682
Main bit.
0.95 mA
LOW
0
0
0
Function
Function
Function
Main VCO Positive
Tuning
Characteristics
Main Charge Pump
Output in High
Impedance State
3.80 mA
HIGH
Main R[18]
Main R[17]
Main R[19]
www.national.com
1
1
1