LMX2354TM National Semiconductor, LMX2354TM Datasheet - Page 20

• Manufacturer Part Number: LMX2354TM
• Description: 34C6468
• Manufacturer: National Semiconductor

Specifications of LMX2354TM

• Number Of Elements: 2
• Supply Current: 8.5mA
• Pll Input Freq (min): 10MHz
• Pll Input Freq (max): 2.5GHz
• Operating Supply Voltage (typ): 3V
• Operating Temp Range: -40C to 85C
• Package Type: TSSOP
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 5.5V
• Operating Temperature Classification: Industrial
• Pin Count: 24
• Pll Type: Frequency Synthesis
• Frequency: 2.5GHz
• Supply Voltage Range: 2.7V To 5.5V
• Digital Ic Case Style: TSSOP
• No. Of Pins: 24
• Operating Temperature Range: -40°C To +85°C
• Rohs Compliant: No
• Lead Free Status / RoHS Status: Not Compliant

Programming Description
(Continued)
5.5 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 15 ns. To enter the locked state (Lock = HIGH) the phase error must be less than the 15 ns RC delay for
5 consecutive reference cycles. Once in lock (Lock = HIGH), the RC delay is changed to approximately 30 ns. To exit the locked
state (Lock = LOW), the phase error must become greater than the 30 ns 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.
20004804
www.national.com
20