Datasheet SP4740NADP, SP4740NAMP Datasheet (GEC Plessey Semiconductors)

THIS DOCUMENT IS FOR MAINTENANCE

PURPOSES ONLY AND IS NOT

RECOMMENDED FOR NEW DESIGNS

SP4740

1·3GHz 44256 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.

FEATURES

■ Low Supply Current

■ Low Radiation

■

Input Wideband Amplifier

■ High Input Sensitivity

■ High Input Impedance

■ TTL/CMOS Output

■ Electrostatic Protection †

† ESD precautions must be observed

1



INPUT



2



SP4740

3

V

CC

4

V

CC

1



INPUT



2



V

CC

V

CC

3

4

Fig 1. Pin connections - top view

SP4740

8

7

6

5

8

7

6

5

0V

0V

OUTPUT

0V

0V

OUTPUT

3062-2.2

DP8

MP8

ABSOLUTE MAXIMUM RATINGS

Supply voltage, V
Input voltage
Storage temperature
Operating temperature range

CC

DIFFERENTIAL

INPUT

1




2



17V

2·5V p-p

255°C to 1150°C

0°C to180°C

1k

1k

2k

2k

Fig. 2 SP4740 block diagram

ORDERING IFORMATION

SP4740 NA DP
SP4740 NA MP

V

CC

4256

0V

3

8

V

CC

4

600

5

7

0V

OUTPUT

SP4740

ELECTRICAL CHARACTERISTICS

These characteristics are guaranteed over the following conditions (unless otherwise stated):

T

= 0°C to 170°C, V

AMB

Characteristic

= 4·5V to 5·5V (Test circuit see Fig. 3)

CC

Pin

Min.

Value

Typ. Max.

Units

Conditions

Supply current, I
Input sensitivity

50MHz
150MHz to 1000MHz
1·1GHz
1·2GHz
1·3GHz

Input overload

Input impedance

CC

8

2,3

2,3

2,3

300
400

35

3
1

1·5

2
4

50

2

50

mA

V

= 15V

CC

RMS sinewave

5

mV

5

mV
mV
mV
mV
mV
mV

50MHz to 500MHz
500MHz to 1·3GHz

Ω

See Fig. 6

pF

Output voltage

3·3

High
Low

5
5

0·1

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 Ω

SAMPLING

SCOPE

180°

HYBRID

COUPLER

0V

D

15V

V
V

Sourcing 0·2mA
Sinking 2mA

115V

50 Ω

SIGNAL

GENERATOR

FROM

50Ω

SOURCE

A



UHF INPUT




VHF INPUT

B

50

1n

1n

1 TURN

100p

1n

C

0·1µ

1n

Fig. 3 Test circuit

15V

1

2

3

4

12p

0·1µ

Fig. 4 Application circuit

1

2

SP4740

3

4

SP4740

8

7

6

5

8

7

CMOS OR

TTL GATE

6

5

6·5k

OUTPUT

1·65k

0V

0V

2

26

24

22

20

18

16

14

12

10

(mV RMS INTO 50Ω )

IN

8

V

6

4

2

0

0 200 400 600 800 1000 1200 1400 1600

SPECIFICATION LIMIT

TYPICAL DEVICE

FREQUENCY (MHz)

SP4740

Fig. 5 Typical input sensitivity

j

1

j

0.5

j

0.2

0.5

j

0.5

1300

1

j

2

2

1000

800

1

S

11

Z

O

0

2

= 50Ω

0.2

j

0.2

2

Fig. 6 Typical input impedance (frequencies in MHz)

600

j

2

60

5

j

2

j

5

200

j

5

2

400

2

3

SP4740

HEADQUARTERS OPERATIONS

GEC PLESSEY SEMICONDUCTORS

Cheney Manor, Swindon,
Wiltshire SN2 2QW, United Kingdom.
Tel: [phone]
Fax: [phone]

GEC PLESSEY SEMICONDUCTORS

P.O. Box 660017
1500 Green Hills Road,
Scotts Valley, California 95067-0017,
United States of America.
Tel: [phone]
Fax: [phone]

CUSTOMER SERVICE CENTRES

• FRANCE & BENELUX Les Ulis Cedex Tel: [phone] Tx: 602858F
Fax : [phone]

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• ITALY Milan Tel: [phone] Fax: [phone]

• JAPAN Tokyo Tel: [phone] Fax: [phone]

• NORTH AMERICA Integrated Circuits and Microwave Products Scotts Valley, USA

Tel [phone] Fax: [phone].
Hybrid Products, Farmingdale, USA Tel [phone]
Fax: [phone].

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• UNITED KINGDOM & SCANDINAVIA

Swindon Tel: [phone] Tx: 444410 Fax : [phone]

These are supported by Agents and Distributors in major countries world-wide.
 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

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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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