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THIS DOCUMENT IS FOR MAINTENANCE PURPOSES ONLY AND IS NOT RECOMMENDED FOR NEW DESIGNS
3062-2.2
SP4740
1*3GHz 4256 PRESCALER WITH LOW CURRENT AND LOW RADIATION
The SP4740 4256 prescaler is one of GPS' range of high speed dividers for consumer frequency synthesis and measurement systems. It has a low supply current, giving reduced dissipation and operating temperatures in an 8-pin plastic DIL (DP8) or miniature plastic DIL (MP8) package. Spurious radiation has been reduced from all stages. The SP4740 incorporates an on-chip preamplifier with differential inputs and has a TTL/CMOS compatible output.
INPUT

1 2 3 4
8 7
0V 0V
VCC VCC
SP4740
6 5
OUTPUT
DP8
FEATURES
s Low Supply Current s Low Radiation s Input Wideband Amplifier s High Input Sensitivity s High Input Impedance s TTL/CMOS Output s Electrostatic Protection
ESD precautions must be observed
INPUT

1 2
8 7
0V 0V
SP4740
3 4
VCC VCC
6 5 OUTPUT
MP8
Fig 1. Pin connections - top view
ABSOLUTE MAXIMUM RATINGS
Supply voltage, VCC Input voltage Storage temperature Operating temperature range 17V 2*5V p-p 255C to 1150C 0C to180C
ORDERING IFORMATION
SP4740 NA DP SP4740 NA MP
VCC 1k 1k 2k 2k 3
VCC 4
4256 DIFFERENTIAL INPUT 1 600 5 OUTPUT
2
8 0V 7 0V
Fig. 2 SP4740 block diagram
SP4740
ELECTRICAL CHARACTERISTICS
These characteristics are guaranteed over the following conditions (unless otherwise stated): TAMB = 0C to 170C, VCC = 4*5V to 5*5V (Test circuit see Fig. 3) Characteristic Pin Min. Supply current, ICC Input sensitivity 50MHz 150MHz to 1000MHz 1*1GHz 1*2GHz 1*3GHz Input overload Input impedance Output voltage High Low 8 2,3 Value Typ. 35 3 1 1*5 2 4 2,3 2,3 300 400 50 2 3*3 0*1 Max. 50 5 5 mA mV mV mV mV mV mV mV pF V V VCC = 15V RMS sinewave Units Conditions
50MHz to 500MHz 500MHz to 1*3GHz See Fig. 6
5 5
Sourcing 0*2mA Sinking 2mA
NOTE 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 SAMPLING SCOPE 180 HYBRID COUPLER 115V D 0V 15V 1n A C
1 2 8 7
50 SIGNAL GENERATOR
SP4740
B 50 1n 0*1
3 4 6 5
6*5k OUTPUT 1*65k 0V
Fig. 3 Test circuit
15V
1n FROM UHF INPUT 50 SOURCE VHF INPUT 1n 1 TURN 12p 100p 0V

1 2
8 7
SP4740
3 4 6 5
CMOS OR TTL GATE
0*1
Fig. 4 Application circuit
2
SP4740
26 24 22 20 18
VIN (mV RMS INTO 50 )
16 14 12 10 8 6 4 TYPICAL DEVICE 2 0 0 200 400 600 800 1000 1200 1400 1600 SPECIFICATION LIMIT
FREQUENCY (MHz)
Fig. 5 Typical input sensitivity
j1 j 0.5 j2
j 0.2
60
j5
0
0.2
0.5
1
2
5
200
2j 5 2j 0.2
1300 1000 800 600 400
S11 ZO = 50
2j 2 2j 0.5 2j 1
Fig. 6 Typical input impedance (frequencies in MHz)
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SP4740
HEADQUARTERS OPERATIONS GEC PLESSEY SEMICONDUCTORS Cheney Manor, Swindon, Wiltshire SN2 2QW, United Kingdom. Tel: (0793) 518000 Fax: (0793) 518411 GEC PLESSEY SEMICONDUCTORS P.O. Box 660017 1500 Green Hills Road, Scotts Valley, California 95067-0017, United States of America. Tel: (408) 438 2900 Fax: (408) 438 5576
CUSTOMER SERVICE CENTRES * FRANCE & BENELUX Les Ulis Cedex Tel: (1) 64 46 23 45 Tx: 602858F Fax : (1) 64 46 06 07 * GERMANY Munich Tel: (089) 3609 06-0 Tx: 523980 Fax : (089) 3609 06-55 * ITALY Milan Tel: (02) 66040867 Fax: (02) 66040993 * JAPAN Tokyo Tel: (03) 3296-0281 Fax: (03) 3296-0228 * NORTH AMERICA Integrated Circuits and Microwave Products Scotts Valley, USA Tel (408) 438 2900 Fax: (408) 438 7023. Hybrid Products, Farmingdale, USA Tel (516) 293 8686 Fax: (516) 293 0061. * SOUTH EAST ASIA Singapore Tel: (65) 3827708 Fax: (65) 3828872 * SWEDEN Stockholm, Tel: 46 8 702 97 70 Fax: 46 8 640 47 36 * UNITED KINGDOM & SCANDINAVIA Swindon Tel: (0793) 518510 Tx: 444410 Fax : (0793) 518582 These are supported by Agents and Distributors in major countries world-wide. (c) GEC Plessey Semiconductors 1996 Publication No. DS3062 Issue No. 2.2 May 1996
This publication is issued to provide information only which (unless agreed by the Company in writing) may not be used, applied or reproduced for any purpose nor form part of any order or contract nor to be regarded as a representation relating to the products or services concerned. No warranty or guarantee express or implied is made regarding the capability, performance or suitability of any product or service. The Company reserves the right to alter without prior knowledge the specification, design or price of any product or service. Information concerning possible methods of use is provided as a guide only and does not constitute any guarantee that such methods of use will be satisfactory in a specific piece of equipment. It is the user's responsibility to fully determine the performance and suitability of any equipment using such information and to ensure that any publication or data used is up to date and has not been superseded. These products are not suitable for use in any medical products whose failure to perform may result in significant injury or death to the user. All products and materials are sold and services provided subject to the Company's conditions of sale, which are available on request.
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