Obsolescence Notice This product is obsolete.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/ SP4666 Prescaler with low current and low radiation DS2219 - 2.4 The SP4666 is a selectable division ratio high speed divider capable of replacing separate fixed ratio ECL prescalers with a single part in applications with alternative 464 and 4256 division requirements. A switched low pass filter with 23dB points at 5·3MHz and 15·6MHz is connected before the output stage to reduce the harmonic content to a very low level. NC 1 8 15V INPUT 2 7 OUTPUT INPUT 3 6 OUTPUT 0V 4 5 464 /4256 SELECT NC 1 8 1 5V INPUT 2 7 OUTPUT INPUT 3 6 OUTPUT 0V 4 5 464 /4256 SELECT SP4666 FEATURES ■ Switched Low Pass Filter for Very Low Output Radiation ■ Low Supply Current ■ Input Wideband Amplifier ■ High Input Sensitivity ■ High Input Impedance ■ Balanced ECL Outputs ■ Electrostatic Protection † SP4666 † ESD precautions must be observed Fig 1. Pin connections - top view ABSOLUTE MAXIMUM RATINGS Supply voltage, VCC Input voltage Storage temperature Operating temperature range ORDERING INFORMATION 17V 2·5V p-p 255°C to 1150°C 0°C to180°C SP4666 NA DP SP4666 NA MP 8 500 1k 1k 500 2k 7 2k 6 464/4256 2 OUTPUTS FILTER VCC INPUTS VCC 2mA 3 10k 464/4256 SELECT 5 20k 50µA 4 Fig. 2 SP4666 block diagram 0V DP8 MP8 SP4666 ELECTRICAL CHARACTERISTICS These characteristics are guaranteed over the following conditions (unless otherwise stated): TAMB = 0°C to 180°C, VCC = 4·5V to 5·5V (Test circuit see Fig. 3) Value Pin Characteristic Min. Supply current, ICC Input sensitivity 50MHz 200MHz to 1050MHz 1050MHz to 1300MHz Input overload Input impedance 8 2,3 2,3 2,3 500 Output voltage with 12pF load 6,7 0·8 0·8 0·4 0·7 0·25 0·6 Output impedance Output imbalance Voltage for 4256 operation Voltage for 464 operation Sink current for 4256 operation 6,7 6,7 5 5 5 Units Typ. Max. 23 30 mA 2·5 0·5 10 5 10 mV mV mV mV Ω pF V p-p V p-p V p-p V p-p V p-p V p-p Ω V V V µA 50 2 1 1 0·5 0·9 0·35 0·7 500 0·1 0·5 3·5 250 Conditions VCC = 15V RMS sinewave (50Ω system) See Fig. 6 464 mode, fIN = 100MHz 4256 mode, fIN = 100MHz 464 mode, fIN = 1000MHz 4256 mode, fIN = 1000MHz 464 mode, fIN = 1300MHz 4256 mode, fIN = 1300MHz See note 1 Vpin5 = 0V NOTES 1. Pin 5 has an internal pull-up and may be left open-circuit for 464 operation. 2. The difference between the maximum input sensitivity and minimum overload voltage is the guaranteed dynamic range. Input signal levels should be maintained within these limits at all frequencies. 50 Ω SAMPLING SCOPE 180° HYBRID COUPLER 15V D 8 1 1n C A 7 OUTPUT 3 6 OUTPUT 4 5 2 SP4666 50 Ω SIGNAL GENERATOR B 50 OPEN = 464 CLOSED = 4256 1n 0·1µ 12p 12p 0V Fig. 3 Test circuit 15V 8 2 VHF INPUT 3 6 4 5 1 1n UHF INPUT 7 SP4666 1n 1 TURN 0·1µ 12p OUTPUTS NOTE: For 464 operation, pin 5 may be left open circuit or connected to 15V 100p 0V Fig. 4 Application circuit 2 SP4666 16 VIN (mV RMS INTO 50Ω ) 14 12 10 8 6 SPECIFICATION LIMIT 4 2 TYPICAL DEVICE 0 0 200 400 600 800 1000 1200 1400 FREQUENCY (MHz) Fig. 5 Typical input sensitivity j1 j 0.5 j2 j 0.2 j5 0.2 0 0.5 1 2 5 50 200 2j 5 1300 2j 0.2 1000 500 S11 ZO = 50Ω 2j 2 2j 0.5 2j 1 Fig. 6 Typical input impedance (frequencies in MHz) 3 For more information about all Zarlink products visit our Web Site at www.zarlink.com Information relating to products and services furnished herein by Zarlink Semiconductor Inc. or its subsidiaries (collectively “Zarlink”) is believed to be reliable. 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