LMX2352TM National Semiconductor, LMX2352TM Datasheet - Page 18

• Manufacturer Part Number: LMX2352TM
• Description: 07B5847
• Manufacturer: National Semiconductor

Specifications of LMX2352TM

• Pll Type: Frequency Synthesis
• Frequency: 1.2GHz
• Supply Current: 4.75mA
• Supply Voltage Range: 2.7V To 5.5V
• Digital Ic Case Style: TSSOP
• No. Of Pins: 24
• Rohs Compliant: No

Programming Description
(Continued)
4.6 LOCK DETECT DIGITAL FILTER
The Lock Detect Digital Filter compares the difference between the phase of the inputs of the phase detector to a RC generated
delay of approximately 15nS. To enter the locked state (Lock = HIGH) the phase error must be less than the 15nS RC delay for
5 consecutive reference cycles. Once in lock (Lock = HIGH), the RC delay is changed to approximately 30nS. To exit the locked
state (Lock = LOW), the phase error must become greater than the 30nS RC delay. When the PLL is in the power down mode,
Lock is forced LOW. A flow chart of the digital filter is shown at right.
DS100831-4
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