lmx2322 National Semiconductor Corporation, lmx2322 Datasheet - Page 7

• Manufacturer Part Number: lmx2322
• Description: Pllatinumtm 2.0 Ghz Frequency Synthesizer For Rf Personal Communications
• Manufacturer: National Semiconductor Corporation

LMX2322
1.7
Rev 1.6
Power Control
appropriate latches (selected by address bits). A complete programming description is included in the following
sections.
The PLL can be power controlled in two ways.
asynchronously powers down the PLL and TRI-STATEs the charge pump output, regardless of the PWDN bit
status. The second method is by programming through MICROWIRE, while keeping the CE HIGH.
Programming the PWDN bit in the N register HIGH (CE=HIGH) will disable the N counter and de-bias the fin
input (to a high impedance state). The R counter functionality also becomes disabled. The reference oscillator
block powers down when the power down bit is asserted. The OSCin pin reverts to a high impedance state
when this condition exists. Power down forces the charge pump and phase comparator logic to a TRI-STATE
condition. A power down counter reset function resets both N and R counters. Upon powering up the N counter
resumes counting in "close" alignment with the R counter (The maximum error is one prescaler cycle). The
MICROWIRE control register remains active and capable of loading and latching in data during all of the power
down modes.
9/24/1998
The first method is by setting the CE pin LOW.
Advance Information
This
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