LMX2352TMX/NOPB National Semiconductor, LMX2352TMX/NOPB Datasheet - Page 18

• Manufacturer Part Number: LMX2352TMX/NOPB
• Description: IC FREQ SYNTHESIZER DUAL 24TSSOP
• Manufacturer: National Semiconductor
• Series: PLLatinum™r
• Type: PLL Frequency Synthesizerr

Specifications of LMX2352TMX/NOPB

• Pll: Yes with Bypass
• Input: CMOS, TTL
• Output: CMOS
• Number Of Circuits: 1
• Ratio - Input:output: 3:3
• Differential - Input:output: Yes/No
• Frequency - Max: 1.2GHz, 550MHz
• Divider/multiplier: Yes/No
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-TSSOP
• Frequency-max: 1.2GHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LMX2352TMX; LMX2352TMXTR

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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