LMX1501 National Semiconductor, LMX1501 Datasheet
LMX1501
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LMX1501 Summary of contents
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... Enable Clock) Supply voltage can range from The LMX1501A and the LMX1511 feature very low current consumption typically The LMX1501A is available in a JEDEC 16-pin surface mount plastic package The LMX1511 is available in a TSSOP 20-pin surface mount plastic package ...
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... Connection Diagrams LMX1501A JEDEC 16-Lead (0 150 Wide) Small Outline Molded Package (M) Order Number LMX1501AM or LMX1501AMX See NS Package Number M16A Pin Descriptions Pin No Pin No Pin Name I O 1501A 1511 1501A 1511 1 1 OSC OSC O OUT ...
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... Functional Block Diagram LMX1501A 12340– 40 ...
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Functional Block Diagram (Continued) LMX1511 12340 – 4 ...
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... Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Power Supply Voltage Voltage on Any Pin with GND Storage Temperature Range ( Lead Temperature (T ) (solder 4 sec ) ...
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Electrical Characteristics Symbol Parameter I Charge Pump Output Current D o -source -sink I Charge Pump TRI-STATE Current D o -Tri V High-Level Output Voltage OH V Low-Level Output Voltage OL V High-Level Output Voltage (OSC OH ...
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Typical Performance Characteristics Charge Pump Current vs D Voltage o Charge Pump Current Variation I TRI-STATE 12340 – 5 Charge Pump Current 12340 – 7 ...
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... Typical Performance Characteristics Input Sensitivity vs Frequency Input Sensitivity at Temperature Variation LMX1501A Input Impedance vs Frequency 100 MHz to 1 600 MHz Marker 1 500 MHz Real 67 Imag 317 Marker 2 900 MHz Real 24 Imag 150 ...
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Charge Pump Current Specification Definitions I1 CP sink current sink current sink current ...
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Functional Description The simplified block diagram below shows the 19-bit data register the 14-bit R Counter and the S Latch and the 18-bit N Counter (intermediate latches are not shown) The data stream is clocked (on the rising edge) into ...
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Functional Description (Continued) PROGRAMMABLE DIVIDER (N COUNTER) The N counter consists of the 7-bit swallow counter (A counter) and the 11-bit programmable counter (B counter) If the Control Bit (last bit shifted into the Data Register) is LOW data is ...
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Functional Description (Continued) SERIAL DATA INPUT TIMING Notes Parenthesis data indicates programmable reference divider data Data shifted into register on clock rising edge Data is shifted in MSB first Test Conditions The Serial Data Input Timing is tested using a ...
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Analog Switch (1511 only) The analog switch is useful for radio systems that utilize a frequency scanning mode and a narrow band mode The purpose of the analog switch is to decrease the loop filter time constant allowing the VCO ...
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Typical Application Example Operational Notes VCO is assumed AC coupled R increases impedance so that VCO output power is provided to the load rather than the PLL Typical values are 10 IN level f RF impedance ranges from 40 to ...
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Application Information LOOP FILTER DESIGN A block diagram of the basic phase locked loop is shown FIGURE 1 Basic Charge Pump Phase Locked Loop An example of a passive loop filter configuration including the transfer function of the loop filter ...
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Application Information (Continued) Therefore if we specify the loop bandwidth phase margin Equations 1 through 6 allow us to calcu- p late the two time constants T1 and T2 as shown in equa- tions 7 and 8 A common rule ...
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Application Information (Continued) Example MHz V e VCO (Note 886 MHz e opt F 25 kHz e ref 35440 e e opt ref 2 5 kHz 3 ...
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Application Information (Continued) FIGURE 5 PLL Reference Spurs The reference spurious level is 66 dBc due to the loop k b filter attenuation and the low spurious noise level of the LMX1511 FIGURE 7 PLL Phase Noise 150 Hz Offset ...
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... One possible architecture for an external charge pump cur- rent source is shown in Figure 9 The signals the diagram correspond to the phase detector outputs of the LMX1501 1511 frequency synthesizers These logic signals are converted into current pulses using the circuitry shown in Figure 9 to enable either charging or discharging ...
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... Physical Dimensions inches (millimeters) JEDEC 16-Lead (0 150 Wide) Small Outline Molded Package (M) For Tape and Reel Order Number LMX1501AMX (2500 Units per Reel) Order Number LMX1501AM NS Package Number M16A 21 ...
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... Hong Kong Ltd 49) 0-180-530 85 86 13th Floor Straight Block a Ocean Centre 5 Canton Rd 49) 0-180-530 85 85 Tsimshatsui Kowloon a Tel ( 49) 0-180-532 78 32 Hong Kong a 49) 0-180-532 93 58 Tel (852) 2737-1600 a Tel ( 49) 0-180-534 16 80 Fax (852) 2736-9960 a National Semiconductor Japan Ltd Tel 81-043-299-2309 Fax 81-043-299-2408 ...