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LM565 bảng dữ liệu(PDF) 11 Page - Texas Instruments |
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LM565 bảng dữ liệu(HTML) 11 Page - Texas Instruments |
11 / 14 page OBSOLETE LM565, LM565C www.ti.com SNOSBU1B – MAY 1999 – REVISED APRIL 2013 APPLICATIONS INFORMATION In designing with phase locked loops such as the LM565, the important parameters of interest are: FREE RUNNING FREQUENCY (1) LOOP GAIN: relates the amount of phase change between the input signal and the VCO signal for a shift in input signal frequency (assuming the loop remains in lock). In servo theory, this is called the “velocity error coefficient.” (2) The loop gain of the LM565 is dependent on supply voltage, and may be found from: (3) fo = VCO frequency in Hz Vc = total supply voltage to circuit Loop gain may be reduced by connecting a resistor between pins 6 and 7; this reduces the load impedance on the output amplifier and hence the loop gain. HOLD IN RANGE: the range of frequencies that the loop will remain in lock after initially being locked. where • fo= free running frequency of VCO • Vc= total supply voltage to the circuit (4) THE LOOP FILTER In almost all applications, it will be desirable to filter the signal at the output of the phase detector (pin 7); this filter may take one of two forms: Figure 16. Simple Lead Filter Figure 17. Lag-Lead Filter Copyright © 1999–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM565 LM565C |
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