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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 INPUT INPUT 0V
1 2 3 4
8 7
15V OUTPUT OUTPUT 464 /4256 SELECT
SP4666
6 5
FEATURES
DP8
s Switched Low Pass Filter for Very Low Output Radiation s Low Supply Current s Input Wideband Amplifier s High Input Sensitivity s High Input Impedance s Balanced ECL Outputs s Electrostatic Protection
ESD precautions must be observed
NC INPUT INPUT 0V
1 2 3 4
8
1 5V OUTPUT OUTPUT 464 /4256 SELECT
SP4666
7 6 5
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 INFORMATION
SP4666 NA DP SP4666 NA MP
8 500 1k 1k 2k 2k 500 7 6
VCC
OUTPUTS
464/4256
FILTER
INPUTS
2
VCC
2mA
3
10k
464/4256 SELECT
5
20k
50A
4
0V
Fig. 2 SP4666 block diagram
SP4666
ELECTRICAL CHARACTERISTICS
These characteristics are guaranteed over the following conditions (unless otherwise stated): TAMB = 0C to 180C, VCC = 4*5V to 5*5V (Test circuit see Fig. 3) Characteristic Pin Min. Supply current, ICC Input sensitivity 50MHz 200MHz to 1050MHz 1050MHz to 1300MHz Input overload Input impedance Output voltage with 12pF load 8 2,3 Value Typ. 23 2*5 0*5 2,3 2,3 6,7 500 50 2 1 1 0*5 0*9 0*35 0*7 500 0*1 0*5 3*5 250 Max. 30 10 5 10 mA mV mV mV mV pF V p-p V p-p V p-p V p-p V p-p V p-p V V V A Units Conditions VCC = 15V RMS sinewave (50 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
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
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.
180 HYBRID COUPLER
50 SAMPLING SCOPE D 1n
1 2 8 7
15V
A
C
OUTPUT OUTPUT
SP4666
3 6 5
50 SIGNAL GENERATOR
B 50 1n
4
OPEN = 464 CLOSED = 4256
0*1
12p
12p 0V
Fig. 3 Test circuit
15V
1n UHF INPUT VHF INPUT 1n 1 TURN 12p 100p
1 2
8 7
SP4666
3 4 6 5
0*1
NOTE: For 464 operation, pin 5 may be left open circuit or connected to 15V
0V
Fig. 4 Application circuit
2

OUTPUTS
SP4666
16 14
VIN (mV RMS INTO 50 )
12 10 8 6 4 2 TYPICAL DEVICE 0 0 200 400 600 800 1000 1200 1400 SPECIFICATION LIMIT
FREQUENCY (MHz)
Fig. 5 Typical input sensitivity
j1 j 0.5 j2
j 0.2 j5
0
0.2
0.5
1
2
5
50
200 1300
2j 5
2j 0.2
1000 500
S11 ZO = 50
2j 2 2j 0.5 2j 1
Fig. 6 Typical input impedance (frequencies in MHz)
3
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