GEC Plessey Semiconductors SP4740NADP, SP4740NAMP Datasheet
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
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