SP8908

SP8908 (MP) 5GHZ ÷ 8 Fixed Modulus Divider Preliminary Information DS4359 ISSUE 1.3 September 1999 The SP8908 is one of a range of very high speed low power prescalers for professional applications. The dividing elements are static D type flip flops and therefore allow operation down to DC if the drive signal is a pulse waveform with fast risetime. The output stage has a differential current output and provides a direct drive into a 50 ohm load. Ordering Information SP8908/KG/MP1S (tubes) SP8908/KG/MP1T (tape and reel) Features • Very High Operating Speed • Operation down to DC with Square Wave Input • Silicon Technology for Low Phase Noise (Typically better than 2140dBc/Hz at 1KHz) • 5V Single Supply Operation • Low Power Dissipation: 360mW (Typ.) • Surface Mount Plastic Package Absolute Maximum Ratings Supply voltage, VCC 6·5V Storage temperature 265°C to 1150°C Maximum junction temperature 1150°C Prescaler input voltage 2·5Vp-p Operating temperature KG240°C to 185°C TCASE OUTPUT VCC VCC 1 8 7 6 48 OUTPUT OUTPUT VREF 400 INPUT INPUT 2 3 400 10mA 4 4 GND Figure 1 - Block Diagram SP8908 Preliminary Information VCC INPUT INPUT GND 1 2 8 7 OUTPUT VCC OUTPUT OUTPUT GND SP8908 3 4 6 5 MP8 Figure 2 - Pin connections - top view Electrical Characteristics These characteristics are guaranteed by either production test or design over the following range of operating conditions unless otherwise stated: TAMB = 240 °C to 185°C, VCC = 4·75V to 5·25V Value Characteristic Supply current Input frequency Input sensitivity Input sensitivity Input overload Input overload Output voltage Output power Pin 1, 8 2, 3 2, 3 2, 3 2, 3 2, 3 6, 7 6, 7 Min. 1·0 440 700 210·0 Typ. 72 0·5 0 Max. 96 5·0 180 570 12·0 Units mA GHz mVrms mVrms mVrms mVrms Vp-p dBm Conditions RMS sinewave fIN = 1GHz and 4.2GHz fIN = 5GHz fIN = 1GHz and 3GHz fIN = 5.0GHz and 3.8GHz Into 50Ω pullup resistor fIN = 1GHz and 5GHz (see note 1 ) NOTE 1. Measured into 50Ω measuring instrument in parallel with 50Ω pullup resistor. See Figure 5. 800 VIN INTO 50Ω (mV RMS) 600 TESTED AS PER TABLE OF ELECTRICAL CHARACTERISTICS 400 OPERATING WINDOW 200 1 2 3 4 5 6 7 FREQUENCY (GHz) Figure 3 - Typical input sensitiviy (sinewave drive) 2 Preliminary Information SP8908 VCC 15V 1 8 50 50 SIGNAL GENERATOR 1n 2 3 1n SP8908 7 6 1n 5 10n 50Ω MEASURING INSTRUMENT 10n 1n 4 Figure 4 - Typical application and test circuit j1 j0.5 3GHz j0.2 5GHz j5 j2 0 0.2 0.5 1 2 5 0·3GHz 2j5 1GHz 2j0.2 2j0.5 2j1 2j2 Figure 5 - Typical input impedance 3 L(f) [dBc/Hz] 4 100 1k FREQUENCY (Hz) 10k 100k SP8908 0 2 10 2 20 2 30 2 40 2 50 2 60 Preliminary Information 2 70 2 80 2 90 2 100 2 110 2 120 2 130 2 140 2 150 Figure 6 - Typical phase noise, input frequency = 3GHz 2 160 2 170 10 For more information about all Zarlink products visit our Web Site at w ww.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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