SP1648 Zarlink Semiconductor, SP1648 Datasheet

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This product is obsolete. This information is available for your convenience only. For more information on Zarlink’s obsolete products and replacement product lists, please visit http://products.zarlink.com/obsolete_products/ ...

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... The device may also be used in phase locked loops and many other applications requiring a fixed or variable frequency clock source of high spectral purity. The SP1648 may be operated from a +5.0V dc supply or a -5.2V dc supply, depending upon system requirements. Operating temperature range: Supply voltage GND PINS +5 ...

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... Typ. Max. Min. Typ. Max. Min Typ 500 - - - - - - 200 225 - - - SP1648 Test Limits -30 C +25 C +85 C Max. Min. Max. Min -0.815 -0.960 -0.750 -0.890 -0.650 -1.650 -1.850 -1.620 -1.830 -1.575 -3.340 -3.800 -3.500 -3.920 -3.620 Typ. Max. Min. Typ. ...

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... OPERATING CHARACTERISTICS Fig.2 illustrates the circuit schematic for the SP1648. The oscillator incorporates positive feedback by coupling the base of transistor TR7 to the collector of TR8. An automatic gain control (AGC) is incorporated to limit the current through the emitter-coupled pair of transistors (TR7 and TR8) and allow optimum frequency response of the oscillator. ...

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... V ( 1.4v for positive supply operation). EE When the SP1648 is used with a constant dc voltage to the varactor diode, the output frequency will vary slightly because of internal noise. This variation is plotted versus operating frequency in Fig.6. Typical transfer characteristics for the oscillator in the voltage controlled mode are shown in Figs ...

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Fig.7 Fig.8 Fig.9 ...

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... No warranty or guarantee express or implied is made regarding the capability, performance or suitability of any product or service. The potential directly affects the output waveform desired to have a sine wave at the output of the SP1648, a series resistor is tied from the AGC point to the most negative power potential (ground if +5 ...